Electronic Product Specification Guide

Electronic Product Specification Guide
ELECTRONIC PRODUCT SELECTION GUIDE
A quick guide to selecting circuit protection
and switching solutions for electronic applications
Resettable
PTCs
Fuses
PulseGuard® Polymeric
ESD Suppressors
Metal Oxide
Varistors
TVS Diodes
and Diode Arrays
Teccor® SIDACtor®
Protection Thyristors
Greentube™
Gas Plasma Arresters
(Improved GDTs)
Teccor® Switching
Thyristors
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The World’s Leading Provider of
Circuit Protection Solutions
As the leader in circuit protection, the
Littelfuse portfolio of brands is backed
by decades of design and manufacturing
expertise, plus the industry’s most
experienced technical support. Littelfuse
products are vital components in virtually
every application that uses electrical
energy, including:
Automotive applications
Digital consumer electronics
Industrial/Electrical applications
Telecom/Datacom circuits
Choose from GDTs, switching thyristors,
TVS diode and diode arrays, varistors,
SIDACtor® devices, fuses, resettable
PTCs, PulseGuard® suppressors,
fuseholders, blocks and clips. Only
Littelfuse offers the breadth of products
to provide you with the correct solution
for your application. Our total solution
methodology helps you take a more
1
stategic approach to designing
your product, resulting in improved
performance, reliability and
customer satisfaction.
• Products that comply with applicable
industry and government standards, as
well as our own uncompromising and
rigorous quality and reliability criteria.
Companies around the world have come
to rely on Littelfuse’s commitment to
providing the most advanced circuit
protection solutions and technical
expertise. It’s this focus that has enabled
Littelfuse to become the world’s leading
provider of circuit protection solutions.
• Forward thinking, application-specific
solutions that provide the assurance
your most demanding requirements
will be met.
A comprehensive approach
to circuit protection
Littelfuse goes well beyond efficient and
comprehensive product delivery. We offer
an integrated approach that includes:
• A very broad, yet deep selection of
products and technologies from a
single source, so you benefit from a
greater range of solutions and make
fewer compromises.
• Dedicated global, customer-focused
and application-specific technical
support services.
For over 75 years, Littelfuse has
maintained its focus on circuit protection.
As we expand in global reach and technical
sophistication, you can continue to
count on us for solid circuit protection
solutions, innovative technologies, and
industry-leading technical expertise. It is a
commitment that only a world class leader
with staying power can support.
Electronic Product Selection Guide
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Table of Contents
Page Number
Wickmann TE5® (Fast-Acting and Time Lag) Fuses . . . . . . . . . . 27
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Midget (Fast-Acting, Slo-Blo® and Indicating) Fuses . . . . . . . . . 28
Table of Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Midget (Increased Time-Delay and Multimeter Protection) Fuses . 28
Description
Overcurrent Facts
Blade Terminal and Special Purpose Fuses
Fuse Facts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Hazardous Area (Barrier Network and SAFE-T-Plus™) Fuses . . . 29
Fuse Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Blade Terminal Fuses (ATO®, MINI®, MAXI®, MEGA®, MIDI®
Alarm Indicating) Fuses . . . . . . . . . . . . . . . . . . . . . . . . .29-30
Fuseholder Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-9
PTC Facts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10
Overcurrent Selection Guide . . . . . . . . . . . . . . . . . . . . . . . 11
Transientology
Overvoltage Suppression Facts . . . . . . . . . . . . . . . . . . . .12-16
Overvoltage Application Guide. . . . . . . . . . . . . . . . . . . . .17-18
Overvoltage Suppressor Selection Guide . . . . . . . . . . . . . .17-21
Resettable PTCs
Fuseholders
154 Series SMF OMNI-BLOK® for NANO2® Fuses . . . . . . . . . . . 23
Fuseholders (For Alarm Indicating Fuse) . . . . . . . . . . . . . . . . 30
Fuseholders (For 3AG, 5x20mm, Midget,
Micro, PICO® II and SFE Fuses) . . . . . . . . . . . . . . . . . . . .30-31
Fuseholders (For ATO®, MINI®, TR5®, TE5®, NANO2®, and Fuses) .31-32
Fuse Blocks and Clips
Fuse Blocks and Clips (For 2AG, 5x20mm, Midget,
and NANO2® Fuses) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Surface Mount
1206L Series and 1812L Series . . . . . . . . . . . . . . . . . . . . . 22
Radial Leaded
30R Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
60R Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Surface Mount Fuses
429, 466, and 433 Series Very Fast-Acting 1206
Thin-Film Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
PulseGuard® Polymeric ESD Suppressors
PGD, PGB, and PGB1 Series PulseGuard® ESD Suppressors . . . . . 33
Surface Mount Varistors
Multilayer Varistors (MHS, ML, MLE, MLN, AUML Series) . . . . . 33
CH Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Silicon Protection
468 and 430 Series Slo-Blo® 1206 Thin-Film Fuses . . . . . . . . . . 22
TVS Diode Arrays (SP05x, SP72x, SPUSBx Series) . . . . . . . . . . 33
467 and 434 Series Very Fast-Acting 0603 Thin-Film Fuses . . . . . 22
Teccor® Protection Thyristors (SIDACtor® and Battrax® Devices) . 34
435 Series Very Fast-Acting Lead-Free 0402 Thin-Film Fuses . . . . 22
TVS Diodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
461 Series TeleLink® Surge Tolerant Fuses. . . . . . . . . . . . . . . 23
Nano2® (Very Fast-Acting, UMF and Slo-Blo®) Fuses . . . . . . . . . 23
446/447 Series, 350V EBF Fuse . . . . . . . . . . . . . . . . . . . . . . 23
PICO® SMF Very Fast-Acting and Slo-Blo® Fuses. . . . . . . . . . . 24
FLAT-PAK® Very Fast-Acting and Slo-Blo® Fuses . . . . . . . . . . . 24
Axial Leaded and Cartridge Fuses
PICO® II (250V Very Fast-Acting, Very Fast-Acting,
Time Lag and Slo-Blo®) Fuses . . . . . . . . . . . . . . . . . . . . . . 24
2AG (Fast-Acting, 350V, Surge Withstand and Slo-Blo®) Fuses . . . 24
MICRO™ Very Fast-Acting Fuses . . . . . . . . . . . . . . . . . . . . . 25
3AG (Fast-Acting and Slo-Blo ) Fuses . . . . . . . . . . . . . . . . . 25
®
3AB (Fast-Acting, Slo-Blo® and Special Very Fast–
Acting Type) Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
High Reliability (PICO® Very Fast-Acting and
MICRO™ Very Fast-Acting) Fuses . . . . . . . . . . . . . . . . . . . . 25
Gas Plasma Arresters (improved GDTs)
Greentube™ Gas Plasma Arresters . . . . . . . . . . . . . . . . . . . 35
Industrial Varistor Products
Radial Lead MOVs
(TMOV®/iTMOV®, UltraMOV™ , C-III, LA, ZA, RA Varistors) . . . . . 36
Axial Lead MOVs (MA Series MOVs) . . . . . . . . . . . . . . . . . . 36
Industrial MOVs (CA, NA, PA, HA, HB34, TMOV34S®, HF34, HG34,
DA and DB Series varistors) . . . . . . . . . . . . . . . . . . . . . . . 36
Switching Products
Switching Product Descriptions (Gas Plasma Switching Devices,
Thyristors, Sensitive Triacs, Triacs, QUADRAC® Devices,
Alternistor Triacs, Sensitive SCRs, SCRs, Rectifiers,
Diacs, Sidacs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37-40
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5x20mm (Fast-Acting, Medium-Acting and Slo-Blo®) Fuses. . . . . 26
3.6x10mm (Fast-Acting and Slo-Blo®) Fuses . . . . . . . . . . . . .26-27
Wickmann TR5® (Fast-Acting and Time Lag) Fuses . . . . . . . . . . 27
Electronic Product Selection Guide
2
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Fuse Facts
The following Fuse Facts section will
provide a better understanding of both
fuses and their typical application. The
fuses described are current-sensitive
devices that serve as an intentional weak
link in an electrical circuit and provide
protection against overheating by reliably
melting during current-overload conditions.
They can be used to protect discrete
components or complete circuits.
Although this guide provides technical
information that will help you determine
your circuit protection solution, such as
product data and design guidelines, it
is not intended to be comprehensive.
Testing is strongly recommended and
should be conducted to verify application
performance.
The following fuse parameters and
application concepts should be well
understood in order to properly select a
fuse for given circuit conditions.
In the absence of special requirements,
Littelfuse reserves the right to make
appropriate changes in design, process,
and manufacturing location without notice.
Ambient Temperature
This refers to the temperature of the
air immediately surrounding the fuse
and should not to be confused with
"room temperature." The fuse ambient
temperature is appreciably higher in many
cases, because it is enclosed (as in a panel
mount fuseholder) or mounted near other
heat producing components, such as
resistors, transformers, etc.
Breaking Capacity
See Interrupting Rating.
Current Rating
This refers to the nominal ampere value
of the fuse. It is established by the
manufacturer as a value of the current the
fuse can carry, based on a controlled set of
test conditions. (See Rerating).
Most catalog fuse part numbers include
series identification and ampere ratings.
Refer to the Overcurrent Selection Guide
section for guidance on making the
proper choice.
Rerating
For 25°C ambient temperatures, it is
recommended that fuses be operated at
no more than 75% of the nominal current
rating established using controlled test
conditions. These test conditions are part
of UL/CSA/ANCE (Mexico) 248-14 "Fuses
for Supplementary Overcurrent Protection",
the primary objective of which is to specify
common test standards for the continued
control of manufactured items intended for
protection against fire, etc. Some common
variations of these standards include:
fully enclosed fuseholders, high contact
resistances, air movement, transient spikes,
and changes in connecting cable size
(diameter and length).
Fuses are essentially temperature-sensitive
devices. Even small variations from the
controlled test conditions can greatly affect
3
the predicted life of a fuse when it is loaded
to its nominal value, usually expressed as
100% of rating. The circuit design engineer
should clearly understand that the purpose
of these controlled test conditions is to
enable fuse manufacturers to maintain
unified performance standards for their
products, and must account for the variable
conditions of the specific application.
To compensate for these variables, the
circuit design engineer who is designing
for trouble-free, long-life fuse protection,
generally loads the fuse no more than
75% of the nominal rating listed by
the manufacturer, keeping in mind that
overload and short circuit protection must
be adequately provided for.
The fuses under discussion are
temperature-sensitive devices whose
ratings have been established in a 25°C
ambient. The fuse temperature generated
by current passing through the fuse,
increases or decreases with ambient
temperature change. The ambient
temperature chart on page 6 illustrates the
effect that ambient temperature has on the
nominal current rating of a fuse.
Dimensions
All dimensions are given in inches unless
otherwise specified. The fuses in this
catalog range in size from the 0402 chip
size (.041"L x .020"W x .012"H) up to the 5
AG, also commonly known as a "MIDGET"
fuse (13/32" D x 11/2" L).
As new products have been developed
over the years, fuse sizes evolved to fill
various electrical circuit protection needs.
The first fuses were simple, open-wire
devices, followed in the 1890's by Edison's
enclosure of thin wire in a lamp base
to make the first plug fuse. By 1904,
Underwriters Laboratories had established
size and rating specifications to meet
safety standards. The renewable type
fuses and automotive fuses appeared in
1914, and in 1927 Littelfuse started making
very low amperage fuses for the budding
electronics industry.
Electronic Product Selection Guide
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The fuse sizes in the chart below began
with the early "Automobile Glass" fuses,
hence the term "AG". The numbers
were applied chronologically as different
manufacturers started making a new size.
For example, "3AG" was the third size
placed on the market.
Other non-glass fuse sizes and
constructions were determined by
functional requirements, but they
still retained the length or diameter
dimensions of the glass fuses. Their
designation was modified to AB in place
of AG, indicating that the outer tube was
constructed from Bakelite, fibre, ceramic,
or a similar material other than glass. The
largest size fuse shown in the chart is
the 5AG, or "MIDGET", a name adopted
from its use by the electrical industry and
the National Electrical Code range which
normally recognizes fuses of 9/16" x 2" as
the smallest standard fuse in use.
Fuse Construction
Internal fuse construction may vary
depending on ampere rating. Fuse photos
in this catalog show typical construction
of a particular ampere rating within the
fuse series.
Fuseholders
In many applications, fuses are installed
in fuseholders. These fuses and their
associated fuseholders are not intended
for operation as a "switch" for turning
power "on" and "off".
Interrupting Rating
Fuse Sizes
Fuse
be classified into four general categories:
very fast-acting, fast-acting, Slo-Blo® and
time delay (surge tolerant) fuses. The
distinguishing feature of Slo-Blo® fuses is
their additional thermal inertia and their
ability to tolerate excessive start-up or
in-rush overload pulses.
Length
Diameter/Width
mm
in
mm
in
0402
1.04
.041
.51
.020
0603
1.60
.063
.813
.032
1206
3.18
.125
1.52
.060
1AG 15.875
.625
6.35
.250
2AG
14.48
.57
4.5
.177
3AG 32.385
1.28
6.985
.275
4AG
31.75
1.25
7.14
.281
5AG
38.1
1.50
10.31
.406
7AG
22.22
.875
6.35
.250
8AG
25.4
1
6.35
.250
Tolerances
The dimensions shown in this catalog
are nominal. Unless otherwise specified,
tolerances are applied as follows:
± .010" for dimensions to 2 decimal places.
± .005" for dimensions to 3 decimal places.
The factory should be contacted concerning
metric system and fractional tolerances.
Tolerances do not apply to lead lengths.
Fuse Characteristics
The characteristic of a fuse design refers to
how rapidly the fuse responds to various
current overloads. Fuse characteristics can
Also known as breaking capacity or short
circuit rating, the interrupting rating is the
maximum approved current which the fuse
can safely interrupt at its rated voltage.
During a fault or short circuit condition,
a fuse may receive an instantaneous
overload current many times greater
than its normal operating current. Safe
operation requires that the fuse remain
intact (no explosion or body rupture) and
clear the circuit.
Interrupting ratings may vary with fuse
design and range from 35 amperes AC for
some 250V metric size (5 x 20mm) fuses
up to 200,000 amperes AC for the 600V
KLK series. Information on other fuse
series can be obtained from the factory.
Fuses listed in accordance with UL/
CSA/ANCE 248 are required to have an
interrupting rating of 10,000 amperes
at 125 VAC, with some exceptions
(See Standards section) which, in many
applications, provides a safety factor
far in excess of the short circuit
currents available.
Nuisance Opening
Nuisance opening is most often caused by
an incomplete analysis of the circuit under
consideration. Of all the "Selection Factors"
listed in the Fuse Selection section, special
attention must be given to the normal
operating current, ambient temperature,
and pulses. A fuse cannot be selected
solely on the basis of normal operating
current and ambient temperature.
For example, one prevalent cause of
nuisance opening in conventional power
supplies is the failure to adequately
consider the fuse's nominal melting I2t
rating. In such an application, the fuse's I2t
rating must also meet the in-rush current
requirements created by input impedance
of the power supply's smoothing filter.
The procedure for converting various
waveforms into I2t circuit values are given
in the Fuse Selection Guide section.
For trouble-free, long-life fuse protection,
it is good design practice to select a fuse
for which the I2t of the waveform is no
more than 20% of the nominal melting I2t
rating of the fuse. Refer to the section on
PULSES in the Fuse Selection section.
Resistance
The resistance of a fuse is usually an
insignificant part of the total circuit
resistance. Since the resistance of
fractional amperage fuses can be several
ohms, this fact should be considered
when using them in low-voltage circuits.
Actual values can be obtained from the
factory. Most fuses are manufactured from
materials which have positive temperature
coefficients and, therefore, it is common
to refer to cold resistance and hot
resistance (voltage drop at rated current),
with actual operation being somewhere
in between.
Cold resistance is the resistance obtained
using a measuring current of no more than
10% of the fuse's nominal rated current.
Values shown in this publication for cold
resistance are nominal and representative.
The factory should be consulted if this
parameter is critical to the design analysis.
Hot resistance is the resistance calculated
from the stabilized voltage drop across
the fuse, with current equal to the
nominal rated current flowing through it.
Resistance data on all Littelfuse products
is available upon request. Fuses can be
supplied to specified controlled
resistance tolerances.
Electronic Product Selection Guide
4
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Fuse Facts continued from previous page
Soldering Recommendations
Voltage Rating
Since most fuse constructions incorporate
soldered connections, caution should
be used when installing fuses intended
to be soldered in place. The application
of excessive heat can reflow the solder
within the fuse and change its rating.
Fuses are heat-sensitive components
similar to semiconductors, and the
use of heat sinks during soldering is
recommended.
The voltage rating, as marked on a fuse,
indicates that the fuse can be relied upon
to safely interrupt its rated short circuit
current in a circuit where the voltage is
equal to, or less than, its rated voltage.
Statistical Process Control
Because compliance with certain
specifications requires destructive
testing, overload tests are performed on a
statistical basis for each lot manufactured.
Time-Current Curve
The graphical presentation of the fusing
characteristic (time-current curves) is
generally an average curve which is
presented as a design aid but is not
generally considered part of the fuse
specification. Time-current curves are
extremely useful in defining a fuse, since
fuses with the same current rating can
be represented by considerably different
time-current curves. The fuse specification
typically will include a life requirement at
100% of rating and maximum opening
times at overload points (usually 135%
and 200% of rating).
A time-current curve represents average
data for the design; however, there may
be some differences in the values for any
one given production lot. Samples should
be tested to verify performance, once the
fuse has been selected.
Underwriters Laboratories
Reference to “Listed by Underwriters
Laboratories” signifies that the fuses
meet the requirements of UL/CSA/
ANCE 248-14 “Fuses for Supplementary
Overcurrent Protection”. Some 32 volt
fuses (automotive) in this catalog are
listed under UL Standard 275. Reference
to “Recognized Under the Component
Program of Underwriters Laboratories”
signifies that the item is recognized under
the component program of Underwriters
Laboratories and application approval
is required.
5
Most common voltage ratings used
by fuse manufacturers for most smalldimension and midget fuses are 24,
32, 63, 125, 250, 300, 350 and 600. In
electronic equipment with relatively
low output power supplies, with circuit
impedance limiting short circuit currents to
values of less than ten times the current
rating of the fuse, it is common practice to
specify fuses with 125 or 250 volt ratings
for secondary circuit protection of 500
volts or higher.
As mentioned previously (See Rerating),
fuses are sensitive to changes in current,
not voltage, maintaining their “status quo”
at any voltage from zero to the maximum
rating of the fuse. It is not until the fuse
element melts and arcing occurs that the
circuit voltage and available power become
an issue. The safe interruption of the
circuit, as it relates to circuit voltage and
available power, is discussed in the section
on Interrupting Rating.
To summarize, under an overload condition,
a fuse may be used at any voltage that
is less than its voltage rating without
detriment to its fusing characteristics.
Please contact the factory for applications
at voltages greater than the voltage rating.
Derivation of Nominal
Melting I2t
Laboratory tests are conducted on each
fuse design to determine the amount
of energy required to melt the fusing
element. This energy is described as
nominal melting I2t and is expressed as
“Ampere Squared Seconds” (A2 Sec). A
pulse of current is applied to the fuse, and
a time measurement is taken for melting
to occur. If melting does not occur within
a short duration of about 1 millisecond
(0.001 seconds) or less for thin-film fuses;
8 milliseconds (0.008 seconds) or less for
axial and cartridge fuses; the level of pulse
current is increased. This test procedure
is repeated until melting of the fuse
element is confined to within the 1 or 8
milliseconds time frame, respectively.
The purpose of this procedure is to assure
that the heat created has insufficient time
to thermally conduct away from the fuse
element. That is, all of the heat energy
(I2t) is used to cause melting. Once the
measurements of current (I) and time (t)
are determined, it is a simple matter to
calculate melting I2t. When the melting
phase reaches completion, an electrical arc
occurs immediately prior to the “opening”
of the fuse element. Clearing I2t = Melting
I2t + arcing I2t. The nominal I2t values given
in this publication pertain to the melting
phase portion of the “clearing”
or “opening”.
Fuse Selection
The application guidelines and product
data in this guide are intended to
provide technical information that will
help with application design. Since
these are only a few of the contributing
parameters, application testing is strongly
recommended and should be used to verify
performance in the circuit/application.
Many of the factors involved with fuse
selection are listed below:
Selection Factors
1. Normal operating current
2. Application voltage (AC or DC)
3. Ambient temperature
4. Overload current and length of time in
which the fuse must open
5. Maximum available fault current
6. Pulses, Surge Currents, In-rush
Currents, Start-up Currents, and
Circuit Transients
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7. Physical size limitations, such as
length, diameter, or height
8. Agency Approvals required, such as
UL, CSA, VDE, METI, or Military
9. Considerations: mounting type/form
factor, ease of removal, axial leads,
visual indication, etc.
Chart 1 – Effect of ambient temperature on
current-carrying capacity (typical)
Curve A Thin-Film Fuses and 313 Series (.010 to .150A)
K ey to char t: Cur ve A : Thi n-F ilm Fus es and 313 S eries (.0 10 to . 150A)
Curve C Cur
Resettable
PTCsF ast -Acting, and S piral Wound F uses
ve B : Very
Cur ve C: Re set table P TCs
10. Fuseholder features: clips, mounting
block, panel mount, p.c. board mount,
R.F.I. shielded, etc.
The voltage rating of the fuse must be
equal to, or greater than, the available
circuit voltage. For exceptions, see
Voltage Rating.
Ambient Temperature
The current carrying capacity tests of
fuses are performed at 25°C and will
be affected by changes in ambient
temperature. The higher the ambient
temperature, the hotter the fuse will
operate, and the shorter its life will
be. Conversely, operating at a lower
temperature will prolong fuse life. A fuse
also runs hotter as the normal operating
current approaches or exceeds the rating
of the selected fuse. Practical experience
indicates fuses at room temperature
should last indefinitely, if operated at no
more than 75% of catalog fuse rating.
* Ambient temperature effects are in addition to the normal rerating.
Example: Given a normal operating
current of 2.25 amperes in an application
using a Very Fast-Acting Cartridge fuse at
room temperature, then:
Nominal Operating Current
0.75 x Percent of Rating
or
2.25 Amperes
0.75 x 1.00
PERC ENT OF RA TING*
120
100
A
B
B
80
A
60
25°C
40
Voltage
Catalog Fuse Rating =
C
140
Normal Operating Current
The current rating of a fuse is typically
derated 25% for operation at 25°C to
avoid nuisance blowing. For example, a
fuse with a current rating of 10A is not
usually recommended for operation at
more than 7.5A in a 25°C ambient. For
additional details, see rerating on page 10
section and Ambient Temperature below.
Curve B FLAT-PAK®, Telelink®, Nano2®, PICO®, Blade Terminal, Special Purpose
and other leaded and cartridge fuses (except 313.010 – .150A)
Chart Key
= 3 Amp Fuse (at 25°C)
C
20
-60°C
-76°F
-40°C
-40°F
-20°C
-4°F
0°C
20°C 40°C
60°C 80°C
32°F 68°F 104°F 140°F 176°F
AMBI ENT TEM PERA TUR E
Similarly, if that same fuse were operated
at a very high ambient temperature of 80°C,
additional derating would be necessary.
Curve “B” of the ambient temperature chart
shows the maximum operating “Percent of
Rating” at 80°C to be 95%, in which case;
Catalog Fuse Rating =
Nominal Operating Current
0.75 x Percent of Rating
or
3.15 Amp Fuse (at 80°C) =
2.25 Amperes
0.75 x 0.95
Overload Current Condition
The current level for which protection is
required. Fault conditions may be specified,
either in terms of current or in terms of
both current and maximum time the fault
can be tolerated before damage occurs.
Time-current curves should be consulted to
try to match the fuse characteristic to the
circuit needs, while keeping in mind that the
curves are based on average data.
100°C
212°F
120°C
248°F
Maximum fault current
The Interrupting Rating of a fuse must meet
or exceed the Maximum Fault Current of
the circuit.
Pulses
The general term “pulses” is used in this
context to describe the broad category of
wave shapes referred to as “surge currents,”
“start-up currents,” “in-rush currents,” and
“transients.” Electrical pulse conditions
can vary considerably from one application
to another. Different fuse constructions
may not react the same to a given pulse
condition. Electrical pulses produce
thermal cycling and possible mechanical
fatigue that could affect the life of the
fuse. Initial or start-up pulses are normal
for some applications and may require the
characteristic of a Slo-Blo® fuse. Slo-Blo®
fuses incorporate a thermal delay design
to enable them to survive normal start-up
pulses and still provide protection against
prolonged overloads. The start-up pulse
should be defined and then compared to
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Nominal melting I2t is a measure of the
energy required to melt the fusing element
and is expressed as “Ampere Squared
Seconds” (A2 Sec.). This nominal melting
I2t, and the energy it represents (within
a time duration of 8 milliseconds [0.008
second] or less and 1 millisecond [0.001
second] or less for thin film fuses), is a
value that is constant for each different
fusing element. Because every fuse type
and rating, as well as its corresponding part
number, has a different fusing element, it
is necessary to determine the I2t for each.
This I2t value is a parameter of the fuse
itself and is controlled by the element
material and the configuration of the fuse
element. In addition to selecting fuses on
the basis of “Normal Operating Currents”,
“Rerating”, and “Ambient Temperature”
as discussed earlier, it is also necessary to
apply the I2t design approach.
This nominal melting I2t is not only a
constant value for each fuse element
design, but it is also independent of
temperature and voltage. Most often,
the nominal melting I2t method of fuse
selection is applied to those applications
in which the fuse must sustain large
current pulses of a short duration. These
high-energy currents are common in
many applications and are described by a
variety of terms, such as “surge current,”
“start-up current,” “in-rush current,” and
other similar circuit “transients” that can
be classified in the general category of
“pulses.” Laboratory tests are conducted
on each fuse design to determine its
nominal melting I2t rating. The values for
I2t given in this publication are nominal
and representative. The factory should be
consulted if this parameter is critical to the
design analysis.
The following example should assist in
providing a better understanding of the
application of I2t.
Example: Select a 125V, very fast-acting
PICO® II fuse that is capable of
withstanding 100,000 pulses of current (I)
of the pulse waveform shown in Figure 1.
The normal operating current is 0.75
ampere at an ambient temperature of 25°C.
7
Chart 2
A
Waveshapes
Formulas
ip
i=k
I2t = ip2 t
t
ib
B
C
D
t
i = ip -kt
I2t = (1/3)(ip2 + ipib + ib2)t
t
i = ip sin t
I2t = (1/2)ip2 t
ip
ip
ip
I2t = (1/3)ip2 t
t
E
ip
OR
t
F
t
ip
t1
Step 1 — Refer to Chart 2 (top) and
select the appropriate pulse waveform,
which is waveform (E) in this example.
Place the applicable value for peak
pulse current (ip) and time (t) into the
corresponding formula for waveshape
(E) and calculate the result as shown:
I2t = 1 (ip)2t
5
1 x 82 x .004 = 0.0512 A2 Sec.
5
This value is referred to as the “Pulse I2t”.
Step 2 — Determine the required value
of Nominal Melting I2t by referring to
Chart 3 (page 8). A figure of 22% is
shown in this chart for 100,000
occurrences of the Pulse I2t calculated
in Step 1. This Pulse I2t is converted to
its required value of Nominal Melting I2t
as follows:
Nom. Melt I2t = Pulse I2t/.22
= 0.0512/.22 = 0.2327 A2 Sec.
i = kt2 OR i = ip (1-kt)2
I2t = (1/5)ip2 t
i = ipe–kt)
I2t ≅ (1/2)ip2 t1
10
Current (Amperes)
the time-current curve and I2t rating for the
fuse. Application testing is recommended
to establish the ability of the fuse design to
withstand the pulse conditions.
8
6
4
2
l2 t
Pulse
Energy
.001
Normal Operating Current
.002 .003 .004 .005
Time (Seconds)
.006
Figure
Figure
11
Step 3 — Examine the I2t rating data
for the PICO® II, 125V, very fast-acting
fuse. The part number 251001, 1 ampere
design is rated at 0.256 A2 Sec., which
is the minimum fuse rating that will
accommodate the 0.2327 A2 Sec. value
calculated in Step 2. This 1 ampere fuse
will also accommodate the specified
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0.75 ampere normal operating current,
when a 25% derating factor is applied
to the 1 ampere rating, as previously
described.
Testing: The above factors should be
considered in selecting a fuse for a given
application. The next step is to verify the
selection by requesting samples for testing
in the actual circuit. Before evaluating the
samples, make sure the fuse is properly
mounted with good electrical connections,
using adequately sized wires or traces.
The testing should include life tests under
normal conditions and overload tests
under fault conditions, to ensure that the
fuse will operate properly in the circuit.
Chart 3
100,000 Pulses
Pulse I2t = 22% of
Nominal Melting I2t
10,000 Pulses
Pulse I2t = 29% of
Nominal Melting I2t
1,000 Pulses
Pulse I2t = 38% of
Nominal Melting I2t
100 Pulses
Pulse I2t = 48% of
Nominal Melting l2t
100000
Standards
UL Listed
A UL Listed fuse meets all the
requirements of the UL/CSA 248-14
Standard. Following are some of the
requirements.
10000
Number of Pulses
etc. A copper dummy fuse is inserted
in the fuseholder by Underwriters
Laboratories, and then the current is
increased until a certain temperature
rise occurs. The majority of the heat is
produced by the contact resistance of the
fuseholder clips. This value of current is
considered to be the rated current of the
fuseholder, expressed as 100% of rating.
Some of the more common, everyday
applications may differ from these UL
test conditions as follows: fully enclosed
fuseholders, high contact resistance, air
movement, transient spikes, and changes
in connecting cable size (diameter and
length). Even small variations from the
controlled test conditions can greatly
affect the ratings of the fuseholder. For
this reason, it is recommended that
fuseholders be derated by 40% (operated
at no more than 60% of the nominal
current rating established using the
Underwriter Laboratories test conditions,
as previously stated).
UL ampere rating tests are conducted at
100%, 135%, and 200% of rated current.
The fuse must carry 100% of its ampere
rating and must stabilize at a temperature
that does not exceed a 75°C rise at 100%.
1000
100
10%
100%
Pulse I2 t / Average Melting I2 t
Note: Adequate time (10 seconds) must exist
between pulse events to allow heat from the
previous event to dissipate.
Fuseholder Selection
Rerating: For 25°C ambient temperatures,
it is recommended that fuseholders be
operated at no more than 60% of the
nominal current rating established using
the controlled test conditions specified by
Underwriters Laboratories. The primary
objective of these UL test conditions is to
specify common test standards necessary
for the continued control of manufactured
items intended for protection against fire,
The fuse must open at 135% of rated
current within one hour. It also must open
at 200% of rated current within 2 minutes
for 0-30 ampere ratings and 4 minutes for
35-60 ampere ratings.
The interrupting rating of a UL Listed
fuse is 10,000 amperes at 125 volts AC
minimum. Fuses rated at 250 volts may
be listed as interrupting 10,000 amperes
at 125 volts and, at least, the minimum
values shown below at 250 volts.
Ampere
Rating of
Fuse
Interrupting
Rating In
Amperes
Voltage
0 to 1
35
250 VAC
1.1 to 3.5
100
250 VAC
3.6 to 10
200
250 VAC
10.1 to 15
750
250 VAC
15.1 to 30
1500
250 VAC
UL 275 Automotive Glass
Tube Fuses (32 Volts)
UL Listed
UL ampere ratings tests are conducted
at 110%, 135%, and 200%. Interrupting
rating tests are not required.
Recognized Under the
Component Program of
Underwriters Laboratories
Canadian Recognized
Component Mark
®
The Recognized Components Program
of UL is different from UL Listing.
For recognition, UL will test a fuse
to a specification requested by the
manufacturer. The test points can be
different from the UL Listing requirements
for fuses that have been designed for a
specific application. Application approval
is required by UL for the use of fuses
recognized under the Component Program.
CSA
CSA Certification in Canada is equivalent
to UL Listing in the United States.
CSA Component
Acceptance Program
The Component Acceptance Program
of CSA is equivalent to the Recognition
Program at UL. This CSA Program
allows the manufacturer to declare a
specification. CSA then tests to this
specification.
METI Approval
METI approval in Japan uses similar
requirements as those covered in the
UL/CSA/ANCE 248-14. METI also uses
special testing similar to that covered in
the IEC standards.
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IEC 60127-2, Sheet 1, 2, 3, 5, 6
(250 Volts)
The IEC is different from UL and CSA, since
IEC is an international organization that
writes specifications and does not certify.
UL and CSA write specifications and are
responsible for testing and certification in
the US and Canada, respectively.
Certification to IEC specifications are given
by such national organizations as SEMKO
(Swedish Institute of Testing and Approvals
of Electrical Equipment) and BSI (British
Standards Institute) , as well as UL and CSA.
IEC 60127-2 defines three breaking
capacity levels (interrupting rating). Low
breaking capacity fuses must pass a test
of 35 amperes or ten times rated current,
whichever is greater, while enhanced
breaking capacity fuses must pass a test
of 150 amperes and high breaking capacity
fuses must pass a test of 1500 amperes.
Sheet 1 — Type F Quick Acting,
High Breaking Capacity
Sheet 2 — Type F Quick Acting,
Low Breaking Capacity
Sheet 3 — Type T Time Lag,
Low Breaking Capacity
Sheet 5 — Type T Time Lag,
High Breaking Capacity
Sheet 6 — Type T Time Lag,
Enhanced Breaking Capacity
The letters 'F' and 'T' represent the timecurrent characteristic of the fast-acting and
time delay fuses. One of these letters will
be marked on the end cap of the fuse.
The newest addition to IEC 60127 is part
4 which covers UMF (Universal Modular
Fuse) products for both through-hole and
surface mount fuse types. The standard
allows for both through-hole and surface
mount fuses with voltage ratings of 32,
63, 125 and 250 volts.
Breaking capacities for the 32, 63, and 125
volt fuses are the same as low breaking
capacity fuses covered by IEC 60127 Part
2. The 250 volt UMF fuse is available in a
low breaking capacity (100A), intermediate
breaking capacity (500A), and high
breaking capacity (1500A).
9
PTC Facts
Interrupting Rating
Overcurrent circuit protection can be
accomplished with the use of either a
traditional one time fuse or the more
recently developed resettable PTC. Both
devices function by reacting to heat
generated by the excessive current flow
in the circuit. The fuse element melts
open, interrupting the current flow, while
the PTC changes from low resistance
to high resistance to limit current
flow. Understanding the differences in
performance between the two types of
devices will make the best circuit protection
choice easier.
PTCs are rated for a maximum short circuit
current at rated voltage. This fault current
level is the maximum current that the device
can withstand keeping in mind that a typical
PTC short circuit rating is 40A. PTCs will
not actually interrupt the current flow (see
Leakage Current above), whereas fuses do
interrupt the current flow in response to the
overload. The range of interrupting ratings
for fuses varies from tens of amperes up to
10000 amperes at rated voltage.
The most obvious difference is that
the PTC is resettable. The general
procedure for resetting after an overload
has occurred is to remove power and
allow the device to cool down. There are
several other operating characteristics that
differentiate the two types of products.
The terminology used for PTCs is often
similar but not the same as for fuses. Two
parameters that fall into this category are
leakage current and interrupting rating.
The circuit parameters may dictate the
component choice based on typical device
rating differences.
Operating Voltage Rating
General use PTCs are not rated above 72V
while fuses are rated up to 600V.
Current Rating
The operating current rating for PTCs can
be up to 11A while the maximum level for
fuses is 60A, in accordance with UL/CSA/
ANCE 248-14.
Temperature Rating
Leakage Current
A PTC is said to have "tripped" when it
has transitioned from the low resistance
state to the high resistance state due
to an overload (see figure 2). Protection
is accomplished by limiting the current
flow to some low leakage level. Leakage
current can range from less than a
hundred milliamps at rated voltage up to a
few hundred milliamps at lower voltages.
The fuse, on the other hand, completely
interrupts the current flow and this open
circuit results in no leakage current after
being subjected to an overload.
The useful upper limit for a PTC is
generally 85°C while the maximum
operating temperature for fuses is 125°C.
The temperature rerating curves (see chart
4) that compare PTCs to fuses illustrate
that more rerating is required for a PTC at
a given temperature.
Additional operating characteristics can be
reviewed by the circuit designer in making
the decision to choose a PTC or a fuse for
overcurrent protection.
Agency Approvals
PTCs are Recognized under the
Component Program of Underwriters
Laboratories to UL Thermistor Standard
1434. These devices have also been
certified under the CSA Component
Acceptance Program.
Log resistance (ohms)
International Electrotechnical
Commission (IEC)
Resistance
Tri p Point
Tem perature (°C)
Reviewing product specifications indicates
that similarly rated PTCs have about twice
(sometimes more) the resistance of fuses.
Figure 2
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Time-Current Characteristic
Chart 4 – Temperature Rerating Curves Comparing PTCs to Fuses
Comparing the time-current curves of
PTCs to time-current curves of fuses show
that the speed of response for a PTC is
similar to the time delay of a Slo-Blo® fuse.
(see figure 3)
Curve A Thin-Film Fuses and 313 Series (.010 to .150A)
Curve B FLAT-PAK®, Telelink®, Nano2®, PICO®, Blade Terminal, Special Purpose
Chart Key
K ey to char t: Cur
A : Thi
n-F ilm
es and
313(except
S eries313.010
(.0 10 to
. 150A)
andveother
leaded
andFus
cartridge
fuses
– .150A)
Cur ve B : Very F ast -Acting, and S piral Wound F uses
Curve C Cur
Resettable
ve C: RePTCs
set table P TCs
Summary
C
140
Many circuit protection issues are a
matter of preference, but there is an
important area of application where the
use of resettable PTCs is becoming a
requirement. Much of the design work for
personal computers and peripheral devices
is strongly influenced by the Microsoft and
Intel System Design Guide which states
that "Using a fuse that must be replaced
each time an overcurrent condition occurs
is unacceptable." In addition, the Plug
and Play SCSI (Small Computer Systems
Interface) Specification for this large
market includes the statement, "...must
provide a self-resetting device to limit the
maximum amount of current sourced."
PERC ENT OF RA TING*
120
100
A
B
B
80
A
60
25°C
40
C
20
-60°C
-76°F
-20°C
-4°F
0°C
20°C 40°C
60°C 80°C
32°F 68°F 104°F 140°F 176°F
AMBI ENT TEM PERA TUR E
100°C
212°F
120°C
248°F
1.5A PTC
1.5A Fuse
A selection guide work-sheet appears on
the following page as an aid in choosing
the best circuit protection component
and determining when PTCs may be
the appropriate choice for providing
overcurrent circuit protection.
-40°C
-40°F
100
10
1206L Series PTC
100
10
TIME IN SECONDS
1.5A PTC
1.5A Fuse
430 Series Slo-Blo®
Thin-Film fuse
1
0.1
0.01
1206L Series PTC
TIME IN SECONDS
430 Series Slo-Blo®
Thin-Film fuse
1
0.001
0.1
1
10
CURRENT IN AMPERES
100
Figure 3
0.1
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0.01
Overcurrent Selection Guide Worksheet
1. Define the circuit operating parameters (complete the following form).
Normal operating current in amperes:
Normal operating voltage in volts:
Maximum interrupt current:
Ambient Temperature:
Typical overload current:
Required opening time at specific overload:
Transient pulses expected (quantity):
Resettable or one-time:
Agency Approvals:
Mounting type/form factor:
Typical resistance (in circuit):
2. Select the proper circuit protection component (see chart below).
4. Verify ambient operating parameters.
3. Determine the opening time at fault.
Consult the Time-Current (T-C) Curve to determine if the selected part will
operate within the constraints of your application. If the device opens too
soon, the application may experience nuisance operation. If the device
does not open soon enough, the overcurrent may damage downstream
components. To determine the opening time for the chosen device, locate the
overload current on the X-axis of the appropriate T-C Curve and follow its line
up to its intersection with the curve. At this point read the time tested on the
Y-axis. This is the average opening time for that device. If your overload current
falls to the right of the curve the device will open. If the overload current is to
the left of the curve, the device will not operate.
Ensure that the application voltage is less than or equal to the device’s
rated voltage and that the operating temperature limits are within those
specified by the device.
5. Verify the device’s dimensions.
Using the information from the Designer’s Guide page, compare the
maximum dimensions of the device to the space available in
the application.
6. Test the selected product in an actual application.
Overcurrent Selection Guide
Surface
30V PTC
Mount PTC Leaded
Operating Current
Range
60V PTC
Leaded
0.200 - 2.6A 0.900 - 9A 0.100 - 3.75A
0402, 0603,
1206 TFF
Nano2®/Telelink®
SMF Fuse
PICO®
II Fuse
3.6x10mm
TR5®/TE5®
Fuses
2AGs
5x20mm
0.250 - 7A
0.062 - 15A
0.062 - 15A
0.05 - 10A
0.40 - 10A
0.100 - 10A
0.032 - 15A
3AG/3ABs
Midgets
0.010 - 35A 0.100 - 60A
Maximum Voltage (1)
15V
30V
60V
24 - 125V
125 - 600V
250V
250V
125 - 250V
250V
250V
250V
600VDC/1000VAC
Maximum Interrupting
Rating (2)
40A
40A
40A
35 - 50A
50 - 300A
50A
35-63A
25 - 100A
10000A
10000A
10000A
200000A
–40°C to
85°C
–40°C to
85°C
–40°C to
85°C
–55°C to 90°C
–55°C to
+125°C
–40°C to
85°C
–55°C to
125°C
–55°C to
125°C
Thermal Rerating
High
High
High
Medium
Low
Low
Low
Low
Low
Opening time at 200%
of Amp Rating (3)
Slow
Slow
Slow
Fast to Medium
Fast to Slow
Low to Medium Low to Medium Low to Medium Low to Medium Low to Medium Low to High
Temperature Range
–55°C to 125°C –55°C to 125°C
Low
–55°C to 125°C –55°C to 125°C
Low
Low
Fast to Medium Fast to Medium Fast to Slow Fast to Medium Fast to Slow Fast to Slow Fast to Slow
Low
Low
Low
Resistance
Medium
Medium
Medium
Low
Low
Low
Low
Low
Low
Agency Approvals (4)
UL, CSA,
TUV
UL, CSA,
TUV
UL, CSA,
TUV
UL, CSA
UMF, UL,
CSA, METI
UL, CSA,
METI
UL, CSA,
VDE, CCC
UL, CSA, VDE,
CCC, SEMKO,
METI, KTL
UL, CSA,
METI
Operational Uses
Multiple
Multiple
Multiple
One Time
One Time
One Time
One Time
One Time
One Time
One Time
One Time
One Time
Mounting/Form
Factor
Surface
Mount
Leaded
Leaded
Surface
Mount
Surface
Mount
Leaded
Leaded
Leaded
Leaded or
Cartridge
Leaded or
Cartridge
Leaded or
Cartridge
Cartridge
Yes
NA
NA
Yes
Yes
Yes
NA
Yes
Yes
Yes
Yes
NA
Yes
NA
NA
Yes
Yes
No
NA
Yes
Yes
Yes
Yes
NA
Transient Withstand
Compliant
Lead-Free
1. Maximum operating voltage in the series, parts may be used at voltages equal to or less than this value.
2. Maximum interrupting rating at specified voltage which may be less than maximum operating voltage.
11
Low to High
Low
Low to High Low to High
Low
CSA, BSI, VDE,
UL, CSA,
METI, SEMKO,
METI
UL, KTL
Low
UL, CSA
3. Opening time is in relation to other forms of protection. A fast device will typically operate within three
seconds at 200% of rated current.
4. See individual series for detailed certification information.
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Overvoltage
Suppression Facts
Characteristics of Transient
Voltage Spikes
Transient Threats –
What Are Transients?
Voltage transients are defined as short
duration surges of electrical energy and
are the result of the sudden release
of energy that was previously stored,
or induced by other means, such as
the switching of inductive loads or the
presence of nearby lightning strikes. These
induced voltage transients may cause
damage to electronic equipment.
100
90
%
Current (I) %
Repeatable transients are frequently
caused by the operation of motors,
generators, or the switching of reactive
circuit components. Random transients,
on the other hand, are often caused by
Lightning (Figure 1) and Electrostatic
Discharge (ESD) (Figure 2). Lightning and
ESD generally occur unpredictably and
may require elaborate monitoring to be
accurately measured, especially if induced
at the circuit board level. Numerous
electronics standards groups have
analyzed transient voltage occurrences
using accepted monitoring or testing
methods. The key characteristics of
several transients are shown below in
Table 1.
I30
I
60
30n
60n
Figure 2. ESD Test Waveform
Why are Transients
of Increasing Concern?
Vp/2
t
t2
Vehicles now employ many electronics
systems to control the engine, climate,
braking and, in some cases, steering
systems. Some of the innovations are
designed to improve efficiency, but many
are safety related, such as ABS and
traction control systems. Many of the
features in appliances and automobiles
employ items which present transient
threats (such as electric motors). Not
only is the general environment hostile,
but the equipment or appliance can also
be sources of threats. For this reason,
careful circuit design and the correct use
of overvoltage protection technology will
greatly improve the reliability and safety
of the end application. Table 2 shows
the vulnerability of various component
technologies.
tr = 0.7 to 1.0ns
Vp
t1
Transient voltage spikes generally exhibit
a "double exponential" wave form, shown
in Figure 1 for lightning and Figure 2 for
ESD. The exponential rise time of lightning
is in the range 1.2µsec to 10µsec and
the duration is in the range of 50µsec
to 1000µsec. ESD on the other hand, is
a much shorter duration event. The rise
time has been characterized at less than
1.0ns. The overall duration is approximately
100ns.
appliances, such as dishwashers, to
industrial controls and even toys, have
increased the use of microprocessors to
improve functionality and efficiency.
Figure 1. Lightning Transient Waveform
Component miniaturization has resulted
in increased sensitivity to electrical
stress. Microprocessors for example,
have structures and conductive paths
which are unable to handle high currents
from ESD transients. Such components
operate at very low voltages, so voltage
disturbances must be controlled to
prevent latent or catastrophic failures.
Sensitive devices such as microprocessors
are being adopted at an exponential
rate. Microprocessors are beginning to
perform transparent operations never
before imagined. Everything from home
Voltage
Current
Rise-time
Duration
Lighting
25kV
20kA
10µs
1000µs
Switching
600V
500A
50µs
500000µs
EMP
1kV
10A
20ns
10000ns
ESD
15kV
30A
<1ns
100ns
Device Type
Vulnerability (volts)
VMOS
30-1800
MOSFET
100-200
GaAsFET
100-300
EPROM
100
JFET
140-7000
CMOS
250-3000
Schottky Diodes
300-2500
Bipolar Transistors
380-7000
SCR
680-1000
Table 2. Range of device vulnerability
Table 1. Examples of transient sources and magnitude
Electronic Product Selection Guide
12
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Overvoltage Suppression Facts continued from previous page
Transient Voltage Scenarios
ESD (Electrostatic Discharge)
Electrostatic discharge is characterised
by very fast rise times and very high peak
voltages and currents. This energy is the
result of an imbalance of positive and
negative charges between objects.
Below are some examples of the voltages
which can be generated, depending on the
relative humidity (RH):
• Walking across a carpet:
35kV @ RH = 20%; 1.5kV @ RH = 65%
Inductive Load Switching
The switching of inductive loads generates
high energy transients which increase in
magnitude with increasingly heavy loads.
When the inductive load is switched off,
the collapsing magnetic field is converted
into electrical energy which takes the
form of a double exponential transient.
Depending on the source, these transients
can be as large as hundreds of volts and
hundreds of Amps, with duration times of
400 milliseconds.
• Generator
• Worker at a bench:
6kV @ RH = 20%; 100V @ RH = 65%
• Relay
• Poly bag picked up from desk:
20kV @ RH = 20%; 1.2kV @ RH = 65%
Referring to Table 2 on the previous page,
it can be seen that ESD that is generated
by everyday activities can far surpass
the vulnerability threshold of standard
semiconductor technologies. Figure 2
shows the ESD waveform as defined in
the IEC 61000-4-2 test specification.
T
V
Typical sources of inductive transients are:
• Walking acrss a vinyl floor:
12kV @ RH = 20%; 250V @ RH = 65%
• Vinyl envelopes:
7kV @ RH = 20%; 600V @ RH = 65%
Figure 3, shows a transient which is the
result of stored energy within the alternator
of an automobile charging system. A
similar transient can also caused by other
DC motors in a vehicle. For example, DC
motors power amenities such as power
locks, seats and windows. These various
applications of a DC motor can produce
transients that are just as harmful to
the sensitive electronic components
as transients created in the external
environment.
T1
90%
• Motor
VS
• Transformer
10%
These examples are extremely common in
electrical and electronic systems. Because
the sizes of the loads vary according to the
application, the wave shape, duration, peak
current and peak voltage are all variables
which exist in real world transients. Once
these variables can be approximated, a
suitable suppressor technology can
be selected.
VB
VS = 25V to 125V
VB = 14V
T= 40ms to 400ms
T1 = 5ms to 10ms
R = 0.5Ω to 4Ω
t
Figure 3. Automotive Load Dump
Lightning Induced Transients
Even though a direct strike is clearly
destructive, transients induced by
lightning are not the result of a direct
strike. When a lightning strike occurs, the
event creates a magnetic field which can
induce transients of large magnitude in
nearby electrical cables.
Figure 4, shows how a cloud-to-cloud
strike will effect not only overhead
cables, but also buried cables. Even a
strike 1 mile distant (1.6km) can generate
high voltage levels in the cables.
Buried Line
Transient Generated:
• 70 V at 1.6km (1 mile)
• 10 kV at 150m (160 yards)
Figure 4. Cloud-to-Cloud Lightning Strike
13
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Overvoltage Suppression Facts continued from previous page
Figure 5 shows the effect of a
cloud-to-ground strike. The transient
generated by this type of strike is much
greater than a transient generated by a
cloud to cloud strike.
Figure 6 shows a typical current waveform
for induced lightning disturbances.
Solutions for Transient Threats
Because of the various types of transients
and applications, it is necessary to
employ protection devices with different
characteristics in different applications.
Littelfuse offers the broadest range
of circuit protection technologies. Our
overvoltage protection portfolio includes:
MOVs
Metal Oxide Varistors (MOV)
Ceramic Technology
They are available in screw terminal, radial,
square and axial leaded form factors. They
offer medium to very high energy ratings
for a wide range of applications.
Surface Mount MOV
Metal Oxide Varistors (MOV)
Ceramic Technology
Diode Arrays
Greentube™ Gas Plasma Arresters/
Gas Discharge Tubes
Silicon Avalanche Diode Technology
Available in surface mount multi-pin
packages. Designed for applications
requiring multi-line ESD protection and the
lowest possible clamp voltage.
Discrete TVS Diode
Silicon Avalanche Diode Technology
Available in surface mount and axial leaded
packages. These devices offer protection
from medium to very high energy
transients and can be used in wide range
of applications.
Teccor® SIDACtor® Devices
Thyristor Breakover Technology
Available in DO-214AA, COMPAK (3-Pin
DO-214), MS-012 and modified MS-013
surface mount, TO-92, TO-218, DO-15,
modified TO-220, and TO-220 through
hole package options. These options
offer protection from medium to high
energy transients. SIDACtor devices
are specifically designed for transient
suppression in telecom and data
transmission systems.
Available in a wide range of voltage ratings
and offer low to medium energy ratings for
a variety of applications.
MLV
Available in a wide range of surface
mount packages. They offer a lower
voltage range and enhanced performance
and filtering characteristics for applications
requiring protection from low to medium
energy transients.
PulseGuard®
Voltage Variable Polymer Technology
Available in surface mount and ‘D-Sub
connector’ format packages. Specifically
designed for high data-rate applications
requiring ESD protection and the lowest
possible capacitance.
11kV
100m
1100 V
10km
110 V
Available in surface mount, axial leaded,
radial leaded and special packages.
The Littelfuse Gas Plasma technology
offers high surge ratings and very low
capacitance for use in telecommunication
and broadband systems.
Deployment of
Protection Devices
Suppression devices are used in either
a longitudinal mode or a metallic mode
and possibly both. In some cases, it is
necessary to employ protection devices in a
cascaded (staged) configuration. Cascaded
solutions (Figures 7 and 8) utilize the best
features of each technology to ensure the
most comprehensive solution.
Glossary of Terms
The following are general terms that apply
to all overvoltage technologies in the
Littelfuse product offering.
Crowbar Device
The class of suppressors that exhibit a
"crowbar" characteristic is usally associated
with 4-layer NPNP silicon bipolar devices
or gas plasma/GDT devices. Upon reaching
a threshold or breakover voltage, further
increase in current flow will cause the
device to rapidly conduct with only a few
volts of forward drop. In essence, the line
is momentarily "short-circuited" during the
transient event.
Operating Temperature Range
The minimum and maximum ambient
operating temperature of the circuit in
which a device will be applied. Operating
temperature does not allow for the effects
of adjacent components, this is a parameter
the designer must take into consideration.
Figure 5. Cloud-to-Ground Lightning Strike
PERCENT OF PEAK VALUE
Multilayer Metal Oxide Varistors
Ceramic Technology
1km
Gas Plama Technology
100
90
50
10
O1
t
t1
TIME
t2
Figure 6. 5kA 8/20µS pulse
Electronic Product Selection Guide
14
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Overvoltage Suppression Facts continued from previous page
Capacitance
DC Breakover
The property of a circuit element that
permits it to store an electrical charge. In
circuit protection, the off-state capacitance
is typically measured at 1 MHz with a 2V
bias applied.
(Also referred to as DC sparkover) The
nominal breakover voltage measured on a
100V/s ramp rate.
Power Fault
A condition where the AC power is
accidentally coupled to a communication
line. This may be a direct connection, or
inductively coupled.
The following are more specifically used
to describe the parameters of gas plasma
technology devices:
Dynamic Breakover
(also referred to as Impulse sparkover) The
maximum breakover voltage measured on
a 100V/µs or 1kV/µs ramp rate (whichever
is specified).
Holdover Voltage
Once the device has switched due to a
transient, it will stay in this low impedance
state until the voltage across it falls below
a specific value, known as the holdover
voltage. When selecting one of these
devices, it is important to make sure the
voltage of the protected system is less than
the holdover voltage value of the protector.
On-state Voltage
(Also referred to as Arc Voltage) The
maximum voltage measured across the
protector when in it’s low impedance state
(fully switched on). Sometimes specified
at a given test current.
Maximum Surge Current
Fuse or PTC
Input
SL1011230
5KP 5.0C, or
higher if higher
voltage required
Figure 7. Circuit example of a cascaded
protection solution
Output
(Also referred to as impulse discharge
current or peak pulse current) The
maximum transient surge current the
protector can handle without degradation
or destruction. Usually quoted using
the industry standard 8x20µs double
exponential waveform.
Maximum AC Surge Current
(Also referred to as alternating discharge
current) The maximum AC surge current
the protector can handle without
degradation or destruction. Usually quoted
using a number of 1 second, 60Hz bursts
(often 5 such bursts), with a 3 minute rest
period between each burst.
Insulation Resistance
An alternative way of quoting leakage
current. It is the effective resistance of the
device at a given voltage: the test voltage
divided by the leakage current. A typical
value would be given as 1 x 109 ohms.
Failsafe
Refers to a device which prevents
hazards due to thermal run-away. The
device is a thermal sensitive switch
which operates at a predetermined
temperature, shorting the terminals of the
protection device (normally gas plasma
device, sometimes SIDACtor® device)
providing a low resistance path. A failsafe
is used in conjunction with overcurrent
protection devices to protect against the
consequences of power fault conditions.
The following are more specifically (but
not exclusively) used to describe the
parameters of silicon avalanche diodes
(SAD) and TVS Arrays:
TVS diode
TVS is an abbreviation for transient voltage
suppressor. Devices which are termed as
TVS diodes (or diode arrays) typically use
Silicon Avalanche Diode technology.
Reverse Standoff Voltage (VR)
In the case of a uni-directional TVS diode,
this is the maximum peak voltage that may
be applied in the ‘blocking direction’ with
no significant current flow. In the case
of a bi-directional transient, it applies in
either direction. It is the same definition as
Maximum Off-state Voltage and Maximum
Working Voltage.
Primary Protection Examples in MDF:
• Gas Plasma (Improved GDT)
• Teccor® SIDACtor® Devices
Secondary and Tertiary Protection
Primary Protection Examples
Secondary and Tertiary Protection at Board Level Examples:
at Board Level Examples:
in MDF:
• Teccor® SIDACtor® Devices
• Teccor® SIDACtor® Devices
• Gas Plasma (Improved GDT)
•® Gas Plasma Technology
• Gas Plasma Technology
• Teccor SIDACtor Devices
• TVS Diodes
• TVS Diodes
• TVS Diode Arrays
• TVS Diode Arrays
®
• PulseGuard Suppressors • PulseGuard® Suppressors
• Multilayer Varistors
• Multilayer Varistors
• Surface Mount Varistors
• Surface Mount Varistors
• MOVs
• MOVs
• TMOV® Varistors
• TMOV® Varistors
Breakdown Voltage (VBR)
Breakdown voltage measured at a specified
DC test current, typically 1mA. Usually a
minimum and maximum is specified.
Figure 8. Cascaded environment solution
15
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Overvoltage Suppression Facts continued from previous page
Maximum Peak Pulse Current (IPP)
Peak Off-State Voltage (VDRM)
Power Dissipation Ratings
Maximum pulse current which can be
applied repetitively. Usually a 10x1000µs
double exponential waveform, but can also
be 8x20µs, if stated.
This is the maximum voltage that can be
applied while maintaining an
off-state condition.
Maximum Clamping Voltage
(VC or VCI)
This is the maximum rated single cycle AC
current level the device can withstand.
When transients occur in rapid succession,
the average power dissipation is the
energy (watt-seconds) per pulse, times
the number of pulses per second. Power
developed in this fashion must be within
the specifications shown on the Device
Ratings and Characteristics table for the
specific device.
Maximum voltage which can be measured
across the protector when subjected to
the Maximum Peak Pulse Current.
Peak Pulse Power (PPP)
Expressed in Watts or Kilowatts, for a 1ms
exponential transient (see figure 1, page 23)
it is IPP multiplied by VCL.
The following are more specifically used
to describe the parameters of Silicon
(thyristor based) breakover devices
(SIDACtor® devices):
On-State Current (IT)
This is the maximum rated continuous onstate current.
Switching Voltage (VS)
The maximum voltage prior to switching to
the on-state during a 100V/µS event.
On-state Voltage (VT)
The maximum voltage measured across
the device during its on-state condition at
its rated on-state current (IT).
Holding Current (IH)
Once a SIDACtor device has switched on,
a level of current through the device is
needed to maintain this condition; this is
specified as the Minimum Holding Current.
If the current is not reduced below this
level, the device will remain ‘latched’.
Peak One-Cycle Surge Current (ITSM)
The following are more specifically used
to describe the parameters of Metal Oxide
Varistors (MOV):
Maximum Non-Repetitive Surge
Current (ITM)
This is the maximum peak current which
may be applied for an 8x20µs impulse,
with rated line voltage also applied,
without causing greater than 10% shift in
nominal voltage.
Maximum Non-Repetitive Surge
Energy (WTM)
Voltage Clamping Device
A clamping device, such as an MOV, refers
to a characteristic in which the effective
resistance changes from a high to low
state as a function of applied voltage. In its
conductive state, a voltage divider action
is established between the clamping
device and the source impedance of the
circuit. Clamping devices are generally
"dissipative" devices, converting much of
the transient electrical energy to heat.
This is the maximum rated transient
energy which may be dissipated for a
single current pulse at a specified impulse
and duration (2µs), with the rated VRMS
applied, without causing device failure.
Nominal Voltage (VN(DC))
This is the voltage at which the device
changes from the off state to the on
state and enters its conduction mode of
operation. This voltage is characterized at
the 1mA point and has specified minimum
and maximum voltage ratings.
Clamping Voltage (VC)
This is the peak voltage appearing across
the MOV when measured at conditions
of specified pulse current amplitude and
specified waveform (8x20µs).
Peak Pulse Current (IPP)
The maximum transient surge current the
device can handle without degradation
or destruction. Usually quoted using the
industry standard 10x1000µs or 2x10µs
double exponential waveform.
Electronic Product Selection Guide
16
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Overvoltage Application Guide
Low/Medium Voltage Electronics
Application
Computers
- desktop, laptop, notebook
Peripherals
- scanner, printer, monitor, disk drive
External Broadband hardware
- modem, set top box
Network hardware - switch, router, hub, repeater
Digital camera/camcorder
Handheld portables
- PDA, cell phone, cordless phone, GPS, MP3 Player,
Circuit
Threat
Solution Series
Technology
High-speed Interfaces:
USB 2.0, IEEE 1394, InfiniBand, RF
antenna circuits, Gigabit Ethernet,
DVI, HDMI
Lightning
PXX00SXMC
SIDACtor® Devices
ESD
PGB1
PulseGuard® Polymer
Medium-speed Interfaces:
USB 1.1, RS 485, Ethernet, video,10
BaseT, 100 BaseT, T1/E1
ESD, EMI, EFT
SP05x, SP72x
MHS, ML, MLE, MLN
SPUSBx
Diode Array
SCR/Rail clamp
MLV, TVS/filter
Lightning
PXX00SCMC, PXX02SX
SL0902, SL1003, SL1011, SL1002,
SIDACtor® Devices,
Gas Plasma Arrestor
Lightning
LCE, SA
PXXXXSX
SL1011, SL0902, SL1003
SAD,
SIDACtor® Devices,
Gas Plasma Arrestor
ESD, EMI, EFT
ML, MLE
SP05x
MLV
Diode Array
Power Inputs:
120/240 VAC, up to 120 VDC
Lightning
Switching Transients
CH, MA, ZA, RA, UltraMOV
SA, P6KE, 1.5PKE
SMBJ, 1KSMBJ,
HV
MOV
SAD
SAD,
Gas Plasma Arrestor
Power and System Inputs
ESD, EMI, EFT
Lightning and System Transients
5KP/SLD
Hi-Rel MOVs
SAD
MOV
Uninterruptible Power Supply (UPS)
EFT, Lightning
TMOV®, UltraMOV™
LA, C-III, ZA,
5KP, 15KP, AK6, AK10
MOV
MOV
SAD
Power Supply
EFT, Lightning,
Commutative Spikes
UltraMOV, LA, TMOV
ZA, HA, CH
5KP, 15KP, AK6, AK10
MOV
MOV
SAD
Consumer Electronics
EFT, Lightning
UltraMOV, LA, ZA, CH, TMOV
1.5KE, 5KP
MOV
SAD
Power Meter
Lightning
TMOV, UltraMOV, C-III
5KP
MOV
SAD
AC Power Taps
EFT, Lightning
UltraMOV, LA,
HA, HF34, HG34, TMOV34S
MOV
MOV
AC Panels
EFT, Lightning
Commutative Spikes
UltraMOV, C-III,
TMOV34S, HA, HB34, HF34, HG34, DA/DB,
5KP, 15KP, AK6, AK10
MOV
MOV
SAD
AC Appliance Control
EFT, Lightning
TMOV, UltraMOV, LA, CH
SMBJ, P6KE, 1.5KE
MOV
SAD
TVSS Protection Modules
Lightning
TMOV, HA, HB34, HF34, HG34,
UltraMOV, TMOV34S
5KP, 15KP, AK6, AK10
SL1002, SL1011, SL0902, SL1003
MOV
MOV
SAD
Gas Plasma Arrestor
Circuit Breakers
EFT, Lightning, Commutative Spikes
UltraMOV, LA, ZA
MOV
PDP, LCD Display
Low-speed Interfaces:
Audio, RS 232, IEEE 1284, push
buttons, key pads, switches
Video equipment
- HDTV, DVD, VCR, set top box
Alarm systems
- security, fire
Metering systems
Medical equipment
Lighting ballast
Remote sensors/transducers
Avionics/Military Electronics
Power Mains Protection
AC line protection
TVSS devices
TVS Diode Selection Guide
Peak Pulse
Power Range
Series Name
Medium
P4SMA
SLD
5KP
Technology Type
Silicon
Avalanche
Diode
Silicon
Avalanche
Diode
Silicon
Silicon
Silicon
Avalanche Avalanche Avalanche
Diode
Diode
Diode
Silicon
Avalanche
Diode
Silicon
Silicon
Silicon
Silicon
Silicon
Avalanche Avalanche Avalanche Avalanche Avalanche
Diode
Diode
Diode
Diode
Diode
Silicon
Avalanche
Diode
Silicon
Avalanche
Diode
Silicon
Silicon
Silicon
Avalanche Avalanche Avalanche
Diode
Diode
Diode
Operating
Temperature (ºC)
-55 to +150
-55 to +150
-55 to +175 -55 to +175 -55 to +175
-55 to +150
-55 to +150 -55 to +150 -55 to +150 -55 to +150 -55 to +150 -55 to +150
-55 to +150
-55 to +150 -55 to +150 -55 to +150
Package Type
DO-214AC
DO-214AC
DO-41
DO-15
DO-15
DO-214AA
DO-214AA DO-214AA
Mounting Method
SMT
SMT
throughhole
throughhole
throughhole
SMT
SMT
Reverse Standoff
(working) Voltage
5.0-440
5.8-455
5.8-467
5.0-180
5.8-467
5.0-440
Peak Pulse Power
Range (based on
10/1000µs pulse
unless stated
otherwise)
400W
400W
400W
500W
600W
NA
NA
NA
NA
Yes
Yes
Yes
No
No
No
Compliant
Lead-Free
17
SA
P6KE
SMBJ
P6SMBJ 1KSMBJ
1.5KE
SMCJ
1.5SMC
Very High
SMAJ
Peak Pulse
Current
(8x20µs)
P4KE
High
15KP
AK6
AK10
DO-201
DO-214AB
DO-214AB
axial
axial
axial
axial
axial
SMT
throughhole
SMT
SMT
throughhole
throughhole
throughhole
throughhole
throughhole
6.8-550
5.5-136
5.8-467
5.0-440
5.8-495
16-30
5.0-220
17-280
58-380
58-470
600W
600W
1000W
1500W
1500W
1500W
2200
based on
100µs/150ms
pulse
5000W
15000W
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
6000A
10000A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
No
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Industrial Environment
Overvoltage Application Guide (cont.)
Application
Telecom/Datacom
Threat
Solution Series
Technology
Robotics
EFT, Lightning, Commutative
Spikes, Inductive Load Switching
UltraMOV, CH, LA, C-III, ZA
SMBJ, P6KE, 1.5KE, 5KP, 15KP
MOV
SAD
Large Motors, Pumps,
Compressors
EFT, Lightning, Commutative
Spikes, Inductive Load Switching
UltraMOV, CH, HA, HB34, BA/BB
DA/DB, PA, RA
MOV
MOV
Motor Drives
EFT, Lightning, Commutative
Spikes, Inductive Load Switching
UltraMOV, TMOV, LA, C-III, RA, CH
SMBJ, P6KE, 1.5KE, 5KP, 15KP
MOV
SAD
AC Distribution
EFT, Lightning, Commutative
Spikes, Inductive Load Switching
UltraMOV, C-III, HA, HB34, BA/BB, DA/DB
5KP, 15KP, AK6, AK10
MOV
SAD
High Current Relays
EFT, Lightning, Commutative
Spikes
UltraMOV, C-III, HA, HB34, BA/BB, DA/DB
MOV
Lightning
PXXXI, PXXXlUA/C, PxxxlCA2, PxxxlSA/C
BxxxxUA/C, BxxxOCA/C
SL1002, SL1011, SL0902, SL1003
SIDACtor® Devices
BATTRAX® Devices
Gas Plasma
ESD
PGB1
PulseGuard® Polymer
Lightning
PXXXXUA/C, PXXXXCA2, PXXXXSA/C
PXXXXSA/B/C, PXXXXSA/B/CMC, PXXXXUA/B/C, PXXX3UA/C,
PXXX6UA/C, BXXXXUA/C, BXXXOCA/C, SL1002, SL1011, SL0902,
SL1003
SIDACtor® Devices
Gas Plasma Arrestor
Medium/low-speed Data
Interfaces:
USB 1.1, Ethernet, RS 232
ESD, EMI, EFT
SP05x, SP72x, SPUSBx,
ML, MLE, MLN, MHS
Diode Array
MLV
Telecom Interface
(secondary):
Tip/Ring Circuits
Lightning
T10A/B/C, PXXXXSA/B/C
SL1002, SL1011, SL0902, SL1003
SIDACtor® Devices
Gas Plasma Arrestor
Power Inputs: 120/240 VAC,
up to 120 VDC
Lightning
P6KE, 1.5KE
CH, ZA, UltraMOV
SAD
MOV
Lightning
PXXXX/EC/SC/UC/SD
SL1002, SL1003,
SL1011, SL0902, SL1026, SL1122
SIDACtor® Devices
Gas Plasma Arrestor
Lightning
T10A/B/C, PXXXXUB/C, PXXXXSCMC, PXXX3UC, PXXX6UA/C,
PXXXXSC, PXXXXEC,
SL1002, SL1003, SL0902, SL1011, SL1026, SL1022
Gas Plasma Arrestor
Lightning
P6KE, 1.5KE
CH, ZA, UltraMOV
HV
SAD
MOV
Gas Plasma Arrestor
High-Speed Interfaces:
USB 2.0, IEEE 1394
ESD
PGB1
PulseGuard®
Polymer
Medium/Low-Speed
Interfaces: USB 1.1, CAN
ESD, EMI
SP05x, SP72x, SPUSBx,
ML, MLE, MLN, MHS
Diode Array
MLV
Power Inputs:
Up to 42 VDC
Load Dump
and Inductive Switching
AUML,
P6K, P6SMBJ, 5KP
1KSMBJ, SLD
CH, ZA
MLV
SAD
SAD
MOV
HID Switching
N/A
XT
Gas Plasma Switches
High energy systems
Telecom: Tip/Ring Circuits
SLIC (Subscriber Line Interface Circuit)
Customer Premise Equipment
- Fax machine
- Answering machine
- xDSL gateway
- Dial-up modem
- Set top box
- T1/E1/J1
- ISDN
Interface Equipment
- PBX systems
- Internet gateways
- DSLAM equipment
Central Office Equipment
- Interexchange carrier
- Local exchange carrier
- Mobile telephone switch
- Repeater/node
Automotive
Circuit
Engine Control Module
Body/Chassis Control
- Body controller
- Antilock braking system
- Steering sensor
- Illumination control
- Instrument cluster
- Air bag module
- Window control module
- Wiper module
- Door lock module
- HID Headlamps
- SLIC hardware
- Public phone
- Cellular phone
- Cordless phone
- Phone Line Protector
- LAN protection
module
High-Speed Data Interfaces:
USB 2.0, IEEE 1394, RF
antenna circuits
Conversion Equipment
Telecom Interface (primary):
- Cellular base station
Tip/Ring Circuits
- Satellite base station
- Microwave base station
Telecom Interface (primary):
Tip/Ring Circuits
- T1/E1/J1
- xDSL
Power Inputs:
- DSLAM
120/240 VAC, up to 120 VDC
- Railroad Signaling
Multimedia systems
- Radio/satellite tuner
- CD/cassette players
- DVD/VCR players
- MP3 players
- Data interface buses
Telematics systems
- Wireless
communication
- GPS receiver
- Navigation system
- Security system
SIDACtor® Devices
Greentube™ Gas Plasma (improved GDT) Selection Guide
Family name
Performance Level
Series Name
TRIGGER
SWITCH
OMEGA
BETA
ALPHA
High
Standard
High
Ultra
XT, LT, VS
SL1024B
SL1024A
SL1011A
SL1011B
SL1021A
SL1021B
SL1002A
SL1003A
SL0902
HV
SL1122A
DELTA
High
SL1221
SL1411A
SL1026
Technology Type
Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma Gas Plasma
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
(GDT)
Temperature Range
-55 to +150
-55 to +150
2 Terminal
3 Terminal,
2 Terminal,
2 Terminal,
Core
Button and
Button and
(no pins) and
axial leads
axial leads
radial leads
Package Type
-55 to +150
-55 to +150
-55 to +150
-55 to +150
-55 to +150
3 Terminal, 3 Terminal, 2 Terminal,
2 Terminal,
Button and
Core
Core
Button and
surface
(no pins) and (no pins) and
axial leads
mount
radial leads radial leads
-55 to +150
-55 to +150
3 Terminal,
Radial and
surface
mount
-55 to +150
-40 to +150
-55 to +150
-55 to +150
-55 to +150
2 Terminal
SMT and
axial leads
2 Terminal
3 Terminal,
2 Terminal
SAD/GP
3 Terminal, axial lead
Hybrid
radial leads and surface
radial leads
mount
3 Terminal
Mounting Method
SMT &
throughhole
throughhole
or clip
mount
throughhole
throughhole
or clip
mount
throughhole
or clip
mount
throughhole
throughhole
SMT
throughhole or
SMT
throughhole or
SMT
throughhole
throughhole
DC Breakover Voltage
230-800
90-600
90-600
75-600
75-350
200-600
200-600
90-600
90-450
90-420
2850-3500
NA
20A
10A*
5A
10A
10A*
20A*
2A
5A
2.5A
NA
400A†
20000A
10000A*
5000A
10000A
10000A*
20000A*
5000A
5000A
2500A
2pF
1.5pF
1.5pF
1.5pF
1.5pF
1.5pF
1.5pF
1.2pF
1.2pF
1pF
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
AC Surge Rating
Peak Pulse Current
(8x20µs)
Max Capacitance
Compliant
Lead-Free
-55 to +150
throughhole
throughhole or
SMT
clip
mounted
90-450
200
184-360
275-1,100
5A*
10A*
10A
40A*
3000A
10000A*
10000A*
20000A
55000A*
1pF
100-200pF
1.5pF
<1pF
2.5pF
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
* Total current through center (ground) terminal
† Repetitive switching current
Electronic Product Selection Guide
18
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Battrax® Device Selection Guide
Series Name
Bxxxx_
Type
Technology Type
CA
CC
1UA
1UC
Single
Single
Dual Negative
Dual Negative
4UA
4UC
Dual Positive/Negative Dual Positive/Negative
UA4
UC4
Quad Negative
Quad Negative
Mod DO-214AA
Mod DO-214AA
MS-013
MS-013
MS-013
MS-013
MS-013
MS-013
Mounting Method
SMT
SMT
SMT
SMT
SMT
SMT
SMT
SMT
Standoff (working)
Voltage (VDRM)
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Programmable
Peak Pulse Rating:
• 2x10µs
150A
500A
150A
500A
150A
500A
150A
500A
• 10x160µs
90A
200A
90A
200A
90A
200A
90A
200A
Package Type
• 10x560µs
50A
150A
50A
150A
50A
150A
50A
150A
• 10x1000µs
45A
100A
45A
100A
45A
100A
45A
100A
• 8X20µs
150A
400A
150A
400A
150A
400A
150A
400A
ITSM
20A
50A
20A
50A
20A
50A
20A
50A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Compliant
Lead-Free
NOTE: 1. Low off-state capacitance MC versions available for SA, SC, and UC part numbers.
2. RoHS versions of parts available, add suffix “L.” Contact factory or visit www.littelfuse.com for additional information.
3. Operating temperature for devices are -40˚C to +150˚C
4. Storage temperature for devices are -65˚C to +150˚C
SIDACtor® Device Selection Guide
Series Name
Pxxx1_
Pxxx2S_
Pxxxx_
SA
SC
CA2
AA2
AC2
UA
UC
A
B
ME
NE
RE
Technology Type
Silicon
Thyristors
Silicon
Thyristors
Silicon
Thyristors
Silicon
Thyristors
Silicon
Thyristors
Silicon
Thyristors
Silicon
Thyristors
Protection
Thyristors
Protection
Thyristors
Protection
Thyristors
Protection
Thyristors
Protection
Thyristors
Package Type
Type
DO-214AA
DO-214AA
Mod DO-214AA
Mod TO-220
Mod TO-220
MS-013
MS-013
TO-218
TO-263 (D2PAK)
TO-220
Mounting Method
SMT
SMT
SMT
Through-hole
Through-hole
SMT
SMT
SMT
SMT
Through-hole
SMT
Through-hole
Standoff (working)
Voltage (VDRM)
58 - 160
58 - 160
58 - 160
58 - 95
58 - 95
58 - 160
58 - 160
58-440
58-440
140-180
140
140
Switching Voltage
(VS)
77 - 200
77 - 200
77 - 200
77 - 130
77 - 130
77 - 200
77 - 200
32 - 600
32 - 600
180 - 260
220
220
Peak Pulse Rating:
• 2x10µs
150A
500A
150A
150A
500A
150A
500A
150A
250A
–––––
–––––
–––––
• 10x160µs
90A
200A
90A
90A
200A
90A
200A
90A
150A
–––––
–––––
–––––
• 10x560µs
50A
150A
50A
50A
150A
50A
150A
50A
100A
–––––
–––––
–––––
• 10x1000µs
45A
100A
45A
45A
100A
45A
100A
45A
80A
–––––
–––––
–––––
• 8X20µs
150A
400A
150A
150A
400A
150A
400A
150A
250A
5000A
3000A
3000A
ITSM
20A
50A
20A
20A
50A
20A
20A
20A
30A
400A
400A
400A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
No
No
Compliant
Lead-Free
Mod DO-214AA Mod DO-214AA
NOTE: 1. Low off-state capacitance MC versions available for SA, SC, and UC part numbers.
2. RoHS versions of parts available, add suffix “L.” Contact factory or visit www.littelfuse.com for additional information.
3. Operating temperature for devices are -40˚C to +150˚C
4. Storage temperature for devices are -65˚C to +150˚C
5. IH = 50 – 150mA for all devices in table
6. CO = 50pf for all devices
19
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
SIDACtor® Device Selection Guide (cont.)
Series Name
Pxxx2__
Pxxx3__
Pxxx0_
AA
AB
AC
AA
AB
AC
SA/EA
SB/EB
SC/EC
Technology Type
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Package Type
Modified TO-220
(two die)
Modified TO-220
(two die)
Modified TO-220
(two die)
Modified TO-220
(three die)
Modified TO-220
(three die)
Modified TO-220
(three die)
DO-214AA/TO-92
DO-214AA/TO-92
DO-214AA/TO-92
Type
Mounting Method
through-hole
through-hole
through-hole
through-hole
through-hole
through-hole
through-hole/SMT
through-hole/SMT
through-hole/SMT
Standoff (working)
Voltage (VDRM)
5
25-275
5
25-275
5
25-275
130-420
130-420
130-420
6-320
6-320
6-320
Switching Voltage (VS)
40-350
40-350
40-350
180-600
180-600
180-600
25-400
25-400
25-400
Peak Pulse Rating:
• 2x10µs
150A
250A
500A
150A
250A
500A
150A
250A
500A
• 10x160µs
90A
150A
200A
90A
150A
200A
90A
150A
200A
• 10x560µs
50A
100A
150A
50A
100A
150A
50A
100A
150A
• 10x1000µs
45A
80A
100A
45A
80A
100A
45A
80A
100A
• 8X20µs
150A
250A
400A
150A
250A
400A
150A
25A
400A
ITSM
20A
30A
50A
20A
30A
50A
20A
30A
50A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
T10B
T10C
Silicon Thyristors
Silicon Thyristors
Compliant
Lead-Free
NOTE: 1. Low off-state capacitance MC versions available for SA, SC, and UC part numbers.
2. RoHS versions of parts available, add suffix “L.” Contact factory or visit www.littelfuse.com for additional information.
3. Operating temperature for devices are -40˚C to +150˚C
4. Storage temperature for devices are -65˚C to +150˚C
5. VDRM - Measured across a single chip
6. IH = 50-150 for all devices in table
SIDACtor® Device Selection Guide (cont.)
Series Name
PxxxxAD
Pxxx0SD
Type
PxxxxU_
UA
UB
Pxxxx_
UC
CA
T10A
CB
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
Silicon Thyristors
TO-218
DO-214AA
MS-013
MS-013
MS-013
Mod. DO-214AA
Mod. DO-214AA
DO-15
DO-201
3-Terminal
Mounting Method
through-hole
SMT
SMT
SMT
SMT
SMT
SMT
through-hole
through-hole
through-hole
Standoff (working)
Voltage (VDRM)
120-550
6-320
6-420
6-420
6-420
58-275
58-275
58-270
80-270
80-270
Switching Voltage (VS)
160-700
25-400
25-600
25-600
25-600
77-350
77-350
80-360
120-360
120-360
Peak Pulse Rating:
• 2x10µs
–––––
1000A
150A
250A
500A
150A
250A
–––––
–––––
–––––
Technology Type
Package Type
Silicon Thyristors Silicon Thyristors Silicon Thyristors Silicon Thyristors
• 10x160µs
–––––
400A
90A
150A
200A
90A
150A
–––––
–––––
–––––
• 10x560µs
–––––
300A
50A
100A
150A
50A
100A
–––––
–––––
–––––
• 10x1000µs
250A
200A
45A
80A
100A
45A
80A
50A
100A
100A
• 8X20µs
1000A
800A
150A
250A
400A
150A
250A
100A
250A
250A
ITSM
120A
50A
20A
30A
50A
20A
30A
30A
50A
50A
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
No
No
Compliant
Lead-Free
NOTE: 1. Low off-state capacitance MC versions available for SA, SC, and UC part numbers.
2. RoHS versions of parts available, add suffix “L.” Contact factory or visit www.littelfuse.com for additional information.
3. Operating temperature for devices are -40˚C to +150˚C
4. Storage temperature for devices are -65˚C to +150˚C
5. IH = 50-150 for all devices in table except T10A (120-180mA), T10B (120-180mA), and T10C (120-260mA)
Electronic Product Selection Guide
20
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Varistor Selection Guide
Metal Oxide Varistors (MOV)
Radial Leaded
Packaged
Surface Mount
Bare Disc
Axial
Leaded
ZA
RA
LA
C-III
UltraMOVTM
Varistor
TMOV®/
iTMOV®
Varistor
PA
HA
HB34,
TMOV34S
HG34 HF34,
DHB34
DA/DB
BA/BB
NA
CA
CH
AUML
MA
Technology
Type
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Zinc
Oxide
Multilayer
Zinc Oxide
Zinc
Oxide
Operating AC
Voltage Range
4-460
4-275
130-1000
130-660
130-625
115-750
130-660
130-750
110-750
130-750
130-2800
130-750
130-2800
14-275
–––––
9-264
Operating DC
Voltage Range
5.5-615
5.5-369
175-1200
–––––
170-825
–––––
175-850
148-970
148-970
175-970
175-3500
175-970
175-3,500
18-369
18
13-365
Peak Current
Range (A)**
50-6500
150-6500
1200-6500
3500-9000
1750-10000
600010000
6500
25000
40000
40000
40000
50000
70000
40000
20000
70000
250-500
–––––
40-100
Peak Energy
Range (J)
0.1-52
0.4-160
11-360
40-530
12.5-400
35-480
70-250
160-1050
220-1050
270-1050
450-10000
270-1050
200-10000
1-23
–––––
0.06-1.7
Temperature
Range (Deg.C)
-55 – +85
-55 – +125
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +85
-55 – +125
-55 – +125
-55 – +85
Lines Protected
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Radial
Leaded
Packaged
Radial
Leaded
Radial
Leaded
Radial
Leaded
Radial
Leaded
Packaged
Packaged
Industrial
Packaged
Industrial
Package
Packaged
Bare Disc
Bare Disc
Surface
Mount
Surface
Mount
Axial
Leaded
5, 7, 10, 14,
8, 16, 22mm
20mm
7, 10, 14
20mm
10, 14,
20mm
7, 10, 14
20mm
14, 20mm
20mm
32, 40mm
34mm
40mm
60mm
34mm
32, 40,
60mm
–––––
–––––
3mm
Series Name
Mount/Form
Factor
Disc Size (MOV)
Agency
Approvals
UL,VDE,
CECC
UL,CSA
UL,CSA,
CECC, &
VDE
UL,CSA,
CECC &
VDE
UL,CSA,
VDE, &
CECC
UL, CSA
UL & CSA
UL & CSA
UL & CSA
UL
UL
–––––
–––––
UL
–––––
–––––
Yes
No
Yes
Yes
Yes
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
No
No
No
No
No
No
No
No
Yes
Yes
Yes
Compliant
Lead-Free
* Not an applicable parameter for this technology
** Not an applicable parameter for Crowbar devices
ESD Suppressor Selection Guide
Littelfuse manufacturers three different product families for ESD suppression. Each technology provides distinct attributes for compatibility to specific circuit requirements.
1. Review the circuit requirements or parameters from the left hand column and compare them to the Littelfuse product offerings shown.
2. Refer to Littelfuse data sheets and application notes for complete technical information.
PulseGuard® Suppressors
Silicon Protection
Surface Mount Connector Array
PGB*, PGB1
Series Name
Multilayer Varistors
Surface Mount
PGD
SP72X
Surface Mount
SP05X
SPUSBx
ML
MLE
MLN
MHS
MLV
ZnO
MLV
ZnO
MLV
ZnO
MLV
ZnO
Technology Type
VVM
VVM
Silicon
SCR/Diode
TVS Avalanche
Diode
USB Port Terminator
(w/ESD Suppression
and EMI Filter)
Working Voltage
0-24VDC
0-24VDC
0-30VDC
0-5.5VDC
0-5.5VDC
0-120VDC
range by type
0-18VDC
0-18VDC
0-42VDC
SOT23 (2),
0805 (4)
Connector
(9, 15, 25,
and 37 pins)
DIP, SOIC (6, 14)
SOT23 (4)
SC70 (2,4,5),
SOT23 (2,4,5),
SOT143 (3),
TSSOP-8 (4),
MSOP-8 (6)
SC70-6 (3)
No
No
0805 (4)
1206 (4)
No
Array Package (No. of Lines)
0603
No
No
No
No
0402-1210
0402-1206
–––––
0402-0603
Typical Device Capacitance
0.06pF
<2pF
3-5pF
30pF
47pF
40-6000pF
40-1700pF
45-430pF
3-22pF
Leakage Current
<1nA
<0.1µA
<20nA
<100nA
<100nA
<25µA
<25µA
<30nA
<1µA
Rated Immunity to IEC 61000-4-2 level 4
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Also Rated for EFT or Lightning Wave
No
No
Yes
TBD
TBD
Yes
Yes
Yes
Yes
Bidirectional (transients of either polarity)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
–
–
–
–
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
Single Line Package
Performs Low Pass Filtering
Compliant
Lead-Free
*PGB series is not RoHs compliant or lead-free. For lead-free and RoHs compliant designs use the PGB1 series
21
Electronic Product Selection Guide
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Overcurrent Suppression Products
Resettable PTCs
1206L Series
1812L Series
30R Series
60R Series
Surface Mount
Surface Mount
Radial Lead
Radial Lead
Vmax
30VDC
Ampere Range
0.90 – 9.0A
Vmax
60VDC
Ampere Range
0.10 – 3.75A
Ihold
(A)
0.20
0.25
0.35
0.50
0.75
1.10
1.50
1.60
Ihold
(A)
0.50
0.75
1.10
1.25
1.50
1.60
2.00
1206L050
2.60
1206L075
Vmax
(VDC)
15.0
15.0
6.0
6.0
6.0
6.0
6.0
6.0
Vmax
(VDC)
15.0
13.2
6.0
6.0
6.0
6.0
6.0
6.0
1206L020
1206L025
1206L035
1206L110
1206L150
4.47 mm (.176)
3.15 mm (.124)
1.12 mm
(.044)
H
Top/
Bottom
View
1.65 mm
(.064)
Side
View
0.58 mm
(.023)
260
Bottom
View
1.13 mm
(.049)
.61 mm
(.025)
Side
View
3.15 mm
(.124)
0.66 mm
(.026)
1.52 mm
(.060)
Pad
Layout
Surface Mount Fuses
0.762 mm
(.030) Top/
Side
View
1812L050
1812L075
1812L110
1812L125
1812L150
1812L160
1812L200
1812L260
2.29 mm
(.090)
Pad
Layout
1.40 mm
(.055)
Side
View
3.30 mm
(.130)
2.03 mm
(.080)
2.16 mm
(.085)
High Current 1206
SlimLine™ Lead-Free 1206 SlimLine™ 1206
SlimLine™ Lead-Free 1206
Very Fast-Acting Thin-Film Fuse
429 Series
Very Fast-Acting Thin-Film Fuse
466 Series
Very Fast-Acting Thin-Film Fuse
433 Series
Slo-Blo® Thin-Film Fuse
468 Series
Voltage range:
24V
24-125V
24 – 125V
32-63V
Ampere range:
7A
0.125 – 5.0A
0.125 – 5.0A
Interrupting ratings: 35A @ 24VAC/VDC
0.125 – .375A
*For RoHS compliant and Lead-Free 7A part
add “L” suffix (ex. 0429007.xxL)
**Use 433 or 466 series for all designs below 7A.
RECOMMENDED PAD LA
50A @ 125VAC/VDC
1.0 – 3.0A
0.125 – .375A
50A @ 125VAC/VDC
1.0-1.5A
[email protected]/VDC
0.5 – 2A
50A @ 63VAC/VDC
0.5 – 2A
50A @ 63VAC/VDC
2.0A
[email protected]/VDC
2.5 – 3A
50A @ 32VAC/VDC
2.5 – 3A
50A @ 32VAC/VDC
3.0A
[email protected]/VDC
4 – 5A
35A @ 24VAC/VDC
4 – 5A
35A @ 24VAC/VDC
YOU TS
3.18
(.125")
3.81
(.150")
RECOMMENDED PAD LA
3.81
(.150")
YOU TS
1.52
(.060")
1.14
(.045")
1.52
(.060")
1.52
(.060")
1.14
(.045")
3.18
(.125")2.03
(.080")
1.52
REFLOW SO LDER
(.060")
1.52
(.060")
1.14
(.045")
Cu
1.14
(.045")
1206
1.52
(.060")
3.18
(.125")
3.18
Cu
(.125")
2.03
(.080")
REFLOW SO LDER
.66
(.026")
.58
(.023")
.56
(.022")
.56
.66
(.026")
.66
(.026")
.58
(.023")
3.18
(.125") Cu
Cu
Sn
.56
(.022")
Sn
.58
(.023")
.56
(.022")
.58
(.023")
Slo-Blo® Thin-Film Fuse
430 Series
3.18(.125")
(.125")
1.65
Very Fast-Acting Thin-Film Fuse
434 Series
Very Fast-Acting Thin-Film Fuse
467 Series
1.52
1.52
(.060")
(.060")
4.834.83
(.190")
(.190")
32 – 63V
(.080")
WAVE SOLDER
32V
WAVE SOLDER
Ampere range:
0.5 – 3.0A
0.25 – 5.0A
1.521.52
(.060")
(.060")
2.03
(.080") 2.03
(.080")
REFLOW SOLDER
2.03
2.03
(.080")
Voltage range:
1.65
(.065")
(.065")
1.27
1.27
3.81 3.81
(.150")(.150") (.050") (.050")
1.14
1.14
(.045") (.045")
4.83 4.83
(.190")
(.190")
3.81 1.27
3.81
(.150") (.150")(.050")
1.14
(.045")
1.27
(.050")
1.14
(.045")
2.03
2.03
(.080") (.080")
REFLOW SOLDER
2.03 2.03
(.080")
(.080")
WAVE SOLDER
WAVE SOLDER
32V
REFLOW SOLDER
.66
(.026")
.66
(.026")
.58
(.023")
.58
(.023")
SlimLine™ Lead-Free 0402
3.18
3.18
1.65
1.65
(.065")
(.065")
1.52
(.060")
1.52
(.060")
Sn
SlimLine™ Lead-Free 0603 SlimLine™ 0603
3.18
(.125")
(.125")
Interrupting ratings: 1.0-1.5A
1.52
(.060")
3.18
(.125")
(.022")
Sn
.66
(.026")
1.52
(.060")
REFLOW SOLDER
Very Fast-Acting Thin-Film Fuse
435 Series
32V
0.25 – 2.0A
0.25 – 5.0A
[email protected]/VDC
0.25 – 1A
50A @ 32VAC/VDC
0.25 – 1A
50A @ 32VAC/VDC
2.0A
[email protected]/VDC
1.25 – 5A
35A @ 32VAC/VDC
1.25 – 5A
35A @ 32VAC/VDC
3.0A
[email protected]/VDC
35A @ 32 VDC
*For new designs use the 468 series
1.52
(.060")
.305
(.012")
.305
(.012")
3.18 (.125")
1.52
(.060")
1.14
(.045")
3.18 (.125")
1.60
(.063")
1.60
(.063")
Sn
1.14
(.045")
.813
(.032")
.813
(.032")
Cu
Sn
.787
Cu
(.031")
.787
(.031")
1.09
(.043")
3.20
(.126")
.18
2.54
(.100")
2.54
(.100")
1.02
(.040")
1.02 .762
(.030")
(.040")
REF.
Sn
1.09 1.02
(.043")
(.040")
1.02
(.040")
.30
(.012")
.30
(.012")
Sn/Pb
Sn/Pb
REF.
.18
R (.007")
Sn
1.09
(.043")
3.20
(.126")
.51
(.020")
.51
(.020")
R (.007")
.787
Cu
(.031")
.787
(.031")
Sn
1.09
(.043")1.02
(.040")
1.02
(.040")
Sn
1.60
(.063")
Cu
1.04
(.041")
1.04
(.041")
.279
(.011")
.279
(.011")
.813
(.032")
1.60
(.063")
Sn
.18
R (.007")
REF.
.18
Sn
.813
(.032")
.279
(.011")
.279
(.011")
R (.007")
REF.
.305
(.012")
.305
(.012")
3.20
(.126")
3.20
(.126")
.584
(.023")
Electronic Product.381Selection
Guide
.584
2.54
(.100")
2.54
(.100")
1.02
(.040")
1.02 .762
(.030")
(.040")
1.09.762
(.030")
(.043")
(.015")
.381
(.023")
22
(.015")
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco,
CA 94080-6370-Main
Local Area: (800)
258-9200-www.stevenengineering.com
1.09.762 Office: (650) 588-9200-Outside
1.09
1.09
(.043")
(.030")
(.043")
(.043")
.558
Surface Mount Fuses
Add “L” suffix when
ordering
compliant
452 series
TeleLink®
NANO2®
NANO2®
Surge Tolerant Minature Fuse
461 Series
Slo-Blo Type Fuse
452/454 Series
Slo-Blo® Type Fuse
449 Series
Voltage range:
600V
125V
125V
Ampere range:
0.5 – 2.0A
0.375 – 5A
0.375 – 5A
50A @ 125VAC/VDC
TBD
Interrupting ratings: 60A @ 600 VAC*
®
*See data sheet for test conditions
*Available September 2005. Contact Littelfuse for
Electrical Specifications.
10.10
(.397")
6.10
(.240")
3.12
(.123")
T
1A
6.10
(.240")
3.12
(.123")
6.10
(.240")
2.69
(.106")
F
T
1A
3.12
(.123")
2.69
(.106")
2.69
(.106")
3.12
(.123")
2.69
(.106")
2.69
(.106")
2.69
(.106")
2.69
(.106")
2.69
(.106")
NANO2®
NANO2®
Very Fast-Acting Type Fuse
451/453 Series
Very Fast-Acting Type Fuse
448 Series
Voltage range:
65 – 125V
65 – 125V
Mounting Type:
Molded Base
Ampere range:
0.062 – 15.0A
0.062 – 15.0A
Fuse Type:
NANO2® Fuse
50A @ 125VAC/VDC
0.062 – 8A
35A @ 125VAC
12 – 15A
[email protected]
300A @ 32VDC
300A @ 32VDC
12 – 15A
4.24
(.167")
10.62
(.418")
35A @ 125VAC
[email protected]
50A @ 65VAC/VDC
300A @ 24VDC
(.084")
REF.
300A @ 32VDC
10A
3.81
(.150")
2.13
See NANO2® Fuse for electrical characteristics.
50A @ 125VAC/VDC
300A @ 32VDC
10A
154 Series
3.81
(.150")
2.13
(.084")
REF.
Recommended Pad Layout
4.24
(.167")
10.62
(.418")
LF
7A
Recommended Pad Layout
1
5
5
Interrupting ratings: 0.062 – 8A
SMF Omni-Blok®
Fuse Block
50A @ 65VAC/VDC
300A @ 24VDC
LF
7A
FUSE
L
F
Add “L” suffix when
ordering
compliant
451 series
1
5
5
10.10
(.397")
LF1.25AT
6.10
(.240")
F
L
F
LF1.25AT
3.81
(.150")
9.73
(.383") REF.
FUSE
3.81
(.150")
6.10
(.240")
6.10
(.240")
5.03
(.198")
9.73
(.383") REF.
F
7A
6.10
(.240")
6.10
(.240")
2.69
(.106")
F
5.03
(.198")
2.69
(.106")
2.69
(.106")
2.69
(.106")
7A
2.69
(.106")
2.69
(.106")
2.69
(.106")
2.69
(.106")
NANO2® UMF
NANO2® 250V UMF
NANO2® 250V UMF
EBF – 350V
Fast-Acting Type Fuse
455 Series
Fast-Acting Fuse
464 Series
Time Lag Fuse
465 Series
Fast Acting Type Fuse
446/447 Series
Voltage range:
125V
250V
250V
350V
Ampere range:
0.40 – 1.6A
.50 – 6.3A
1.0 – 6.3A
2 – 10A
100A @ 250VAC
100A @ 250VAC
100A @ 350VAC
Interrupting ratings: 50A @ 125VAC/VDC
50A @ 125VDC
450A @ 60VDC
6.10
(.240")
2.69
(.106")
F
2.69
(.106")
2.69
(.106")
4.5
(.177")
F �500�AL
AC250V
4.5
(.177")
6.7
(.264")
WAVE SOLDER
5.6
(.22")
3.5
(.14")
6.9
(.27")
4.5
(.177")
WAVE SOLDER
5.6
(.22")
4.5
(.177")
6.7
(.264")
REFLOW SOLDER
12.1
(.475")
F T1AL
AC250V
Electronic Product Selection Guide
6.7
(.264")
REFLOW SOLDER
5.6
(.22")
3.5
(.14")
6.9
(.27")
WAVE SOLDER
5.6
(.22")
3.5
(.14")
3.81
(.150")
10.92
(.430")
WAVE SOLDER
5.6
(.22")
4.5
(.177")
350V
6.9
(.27")
6.7
(.264")
P AT
LF
5.6
(.22")
4.5
(.177")
5.6
(.22")
3.5
(.14")
23
6.9
(.27")
6.7
(.264")
T1AL
AC250V
F
6.7
(.264")
REFLOW SOLDER
8.76
(.345")
P AT
LF
A60
2.69
(.106")
1A
AC250V
12.1
(.475")
4.5
(.177")
5.6
(.22")
4 6 02
1A
12.1
(.475")
6.7
(.264")
F �500�AL
4.5
(.177")
A60
F
4 6 02
12.1
(.475")
6.10
(.240")
350V
3.81
(.150")
10.92
(.430")
5.59
(.220")
6.7
(.264")
REFLOW SOLDER
8.76
(.345")
5.59
(.220")
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Surface Mount Fuses
PICO® SMF
PICO® SMF
FLAT-PAK®
FLAT-PAK®
Very Fast-Acting Type Fuse
459 Series
Slo-Blo Type Fuse
460 Series
Fast-Acting Type Fuse
202 Series
Slo-Blo® Type Fuse
203 Series
®
202 FLAT- PAK
202G FLAT-PAK
PAT 4563666
PAT 4563666
F 2A
LF 250 V
F 2A
LF 250 V
Voltage range:
125V
125V
250V
Ampere range:
0.062 – 5.0A
0.5 – 5.0A
0.062 – 5.0A
50A @ 125VAC/VDC
50A @ 250VAC
Interrupting ratings: 50A @ 125VAC,
300A @ 125VDC
250V
.372"
.250"
* For new or RoHS compliant designs
use 464 series
5A
1 25 V
LF
5A
1 25 V
LF
®
®
45 9
B3
45 9
B3
®
.120"
.325"
.065"
5A
.065"
.120"
.117"
1 25 V
45 9
LF
.195"
®
.080"
202 FLAT- PAK
.170"
F 2A
LF 250.120"
V
B3
RECOMMENDED
.285"
PAD LAYOUT
REF.
.080"
.120"
.195"
F 2A
LF 250 V
F 2A .165"
.195"L
F 250
V
PAT 4563666
.021"
.400"
.012"
DIP Configuration
(Thru-Hole) Mounting
PICO II 250V
Very Fast-Acting Type Fuse
263 Series
203 FLAT- PAK
T 2A
LF 250 V
PAT 4563666
32 – 125V
250V
0.062 – 15A
0.062 – 5.0A
Interrupting ratings: 300A @ Rated VDC
T 2A
LF 250 V
PAT 4563666
PAT 4563666
.372"
.250"
.372"
SMF Configuration
("Gull Wing" Surface Mount)
.454
T 2A
LF 250 V
PAT 4563666
125V.372"
.674
.060"
.160
.110
.454
.110
® Layout
Recommended Pad
Slo-Blo
Type Fuse
473 Series
.250"
.165"
.060"
.060"
.160
125V
0.375 – 7.0A
50A @ 125VAC/VDC
Recommended Pad Layout
.160
.110
.454
Recommended Pad Layout
7.11 (.280")
REF.
LF
7.11 (.280")
REF.
7.62 (.300")
REF.
LF
1A
0.64 (.025") DIA.
(1/16 – 10A)
0.81 (.032") DIA.
(12 – 15A)
2.80 (.110")
DIA. �A�.
0.64 (.025") DIA.
3 1/2 A
250 V
LF
3.683 (.145")
DIA. REF.
0.64 (.025") DIA.
7.11 (.280")
REF.
LF
1A
2.413 (.095")
DIA. REF.
1A
0.64 (.025") DIA.
3.175 (.125")
DIA. REF.
Add “P” suffix when
ordering
compliant
and
parts
2AG
2AG Special 350V
2AG
2AG
Fast-Acting Type Fuse
224/225/224P/225P Series
Fast-Acting Type Fuse
220 007/220 007P Series
Slo-Blo® Type Fuse
229/230/229P/230P Series
Surge Withstand Type Fuse
229/230/229P/230P Series
(Select Ratings)
Voltage range:
125 – 250V
350V
125 – 250V
125 – 250V
Ampere range:
0.10 – 10.0A
3.0A
0.25 – 7.0A
100A @ 350VAC
0.25 – 3.5A
Interrupting ratings: 0.1 – 10A
0.1 – 1A
1.5 – 3.5A
10000A @ 125VAC
35A @ 250VAC
4 – 7A
100A @ 250VAC
4.5
(.177")
14.48 (.57")
400A @ 125VAC
0.25 – 1A
1.25 – 3.5A
4.5
(.177")
0.250 – 1.25A
10000A @ 125VAC
35A @ 250VAC
10000A @ 125VAC
0.25 – 1A
1.25A
35A @ 250VAC
100A @ 250VAC
100A @ 250VAC
4.5
(.177")
14.48 (.57")
0.25 – 1.25A
4.5
(.177")
14.48 (.57")
.454
Recommended Pad Layou
PICO II
T 2A
SMF Configuration
.454
("Gull Wing" Surface
Mount)
.110
.674
.055"
.600"
SMF Configurat
("Gull Wing" Surface
.003"
.674
PAT 4563666
50A.600"
@ 125VAC/VDC
50A @ Rated VAC
.165"
.250"
.055"
.600"
SMF Configuration
("Gull Wing" Surface Mount)
203G FLAT-PAK
.055"
.600"
.250"
SMF Configuration
("Gull Wing" Surface Mount)
.165"
.674
.055"
.003"
.372"
T 2A
LF 250 V
.160
.003"
0.5 – 5.0A
.165"
PAT 4563666
.372"
.250"
T 2A
LF 250 V
.003"
203G FLAT-PAK
.165"
203G FLAT-PAK
PAT 4563666
®
LF 250 V
Time Lag Type
Fuse
471 Series .372"
.372"
.250"
Recommended Pad Layo
.165"
.165"
®
Recommended Pad Layout
.160
.454
.110
203 FLAT- PAK
T 2A
LF 250 V
.160
PICO II
PAT 4563666
.372"
.250"
50A @ 250VAC
203G FLAT-PAK
.160
203 FLAT- PAK.110
.454
203 FLAT- PAK
SMF
Configuration
.454
.110("Gull Wing" Surface Mount)
Recommended Pad Layout
.674
.674
SMF Configuration
("Gull Wing" Surface Mount)
Recommended Pad Layout
.674
.021"
.160
T 2A
LF.165"
250 V
6o
.195"
Very Fast-Acting Type Fuse
251/253 Series
Ampere range:
.372"
.250"
o
.674
.110
PAT 4563666
202G FLAT-PAK
.065"
®
Voltage range:
.012"
DIP Configuration
(Thru-Hole) Mounting
RECOMMENDED
.135"
.117".250"
PAD LAYOUT
.372"
.400"
.250" .021"
.012"
.165"
.165"
DIP Configuration
RECOMMENDED
(Thru-Hole) Mounting
PAD LAYOUT
.372"
.065"
PICO II
®
.400"
.250"
.117"
PAT 4563666
.135"
6o
.325"
.372"
.165"
(Thru-Hole) Mounting
F 2A
LF 250 V
.325"
PAT 4563666
.250"
.400"
* For new or 6RoHS compliant
designs
.012"
.165"
DIP Configuration
use 465 series
.021"
202G FLAT-PAK
202 FLAT- PAK
.170"
.285"
REF.
RECOMMENDED
PAD LAYOUT
Axial Leaded Fuses
45 9
B3
®
.117"
®
.080"
1 25 V
LF
®
.080"
.170"
5A
.325"
.285"
REF.
.285"
REF.
Add “L” suffix when
ordering
compliant
PICO®II products
.170"
.135"
50A @ 250VAC
.372"
.165"
.135"
®
.165"
PAT 4563666
PAT 4563666
6
.372"
.250"
.250"
F 2A
0.25 –LF5.0A
250 V
F 2A
LF 250 V
o
.372"
202G FLAT-PAK
202 FLAT- PAK
14.48 (.57")
Electronic Product Selection Guide
24
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Axial Leaded and Cartridge Fuses
Add “P” suffix when
ordering
compliant
and
3AG parts
MICRO™
3AG
3AG
Very Fast-Acting Type Fuse
272/273/274/278/279 Series
Fast-Acting Type Fuse
312/318/312P/318P Series
Slo-Blo® Type Fuse
313/315/313P/315P Series
Voltage range:
125V
32 – 250V
32 – 250V
Ampere range:
0.002 – 5.0A
0.031 – 35.0A
0.01 – 30.0A
10000A @ 125VAC
0.01 – 8A
35A @ 250VAC
.01 – 1A
QPL
*
Interrupting ratings: 10000A @ 125VAC/VDC
*Ratings above 0.031A are RoHS compliant and
Lead-Free
272 000 Series
5.969
(.235")
10000A @ 125VAC
35A @ 250VAC
1.2 – 3.2A
100A @ 250VAC
4 – 8A
200A @ 250VAC
10 – 30A
300A @ 32VAC
273 000 Series
7.30
(.29")
4.32
(.17")
.35"
.25"
.17"
.10"
278 000 Series
272 000 Series
.29"
7.30
(.29")
.235"
5.969
(.235")
6.35
(.25")
1.0"
4.32
(.17")
273 000 Series
.25"
.35" 000
.17" Series
313
.10"
279 000 Series
8.89
278
000 Series
25.4 (1.0")
(.35")
.29"
.235"
315 000 Series
313 000 Series
315 000 Series
.10"
6.985
(.275")
6.985
(.275")
1.0"
32.385
(1.28")
32.385
(1.28")
.10"
NOTE: Amperage and voltage rating stamped on cap. Leads are solder-coated
279 000 Series
copper; .025" diameter.
6.35
(.25")
8.89
(.35")
25.4 (1.0")
Add “P” suffix when
ordering
compliant
and
parts
3AB
3AB
3AB
Fast-Acting Type Fuse
314/324/314P/324P Series
Slo-Blo® Type Fuse
326/325/326P/325P Series
Special Very Fast-Acting Type Fuse
322/322P Series
Voltage range:
250V
125 – 250V
65 – 250V
Ampere range:
0.125 – 30.0A
0.010 – 30A
NOTE: Amperage and voltage rating stamped on cap. Leads are solder-coated
copper; .025" diameter.
Interrupting ratings: 0.125 – 20A
10000A @ 125VAC/DC
25 – 30A
0.125 – .75A
1 – 3A
400A @ 125VAC/DC
35A @ 250VAC
100A @ 250VAC
4 – 15A
20A
25 – 30A
750A @ 250VAC
1000A @ 250VAC
100A @ 250VAC
0.010 – 3.2A
4 – 20A
25 – 30A
313 000 Series
1 – 30A
10000A @ 125VAC
1 – 10A
100A @ 250VAC
10000A @ 125VAC
400A @ 250VAC
400A @ 125VAC
12 – 30A
315 000 Series
326 000 Series
325 000 Series
6.985
(.275")
32.385
(1.28")
10000A @ 125VAC
100A @ 250VAC
200A @ 65VAC
322 000 Series
6.35 (.25")
6.985
(.275")
32.385
(1.28")
31.75 (1.25")
High Reliability
PICO®
MICRO™
Very Fast-Acting Type Fuse
265/266/267 Series
Very Fast-Acting Type Fuse
262/268/269 Series
QPL
QPL
Voltage range:
32 – 125V
125V
Ampere range:
0.062 – 15.0A
.002 – 5.0A
Interrupting ratings: 300A @ rated VDC
10000A @ 125VAC/VDC
50A @ rated VAC
Also available in 25.4mm lead length
265 000 Series
1.50"
.28"
1.50"
3/4 A
.093"
DIA.
Transparent
Insulating Sleeve
266 000 Series
7.112 (.28")
2.36
(.093")
DIA.
3/4 A
262 000 Series
4.32
7.37 (.17")
(.29")
5.969
(.235")
268 000 Series
.29"
1.0"
.10"
Transparent
Insulating Sleeve
(Note 1: .36" for 15 amp rating)
25
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Axial Leaded and Cartridge Fuses
Add “P” suffix when
ordering
compliant
and
parts
5 x 20mm
5 x 20mm
5 x 20mm
5 x 20mm
IEC Fast-Acting Type Fuse
217 Series
IEC Slo-Blo® Type Fuse
213 Series
IEC Fast-Acting Type Fuse
216 Series
IEC Slo-Blo® Type Fuse
215 Series
Voltage range:
250V
250V
250VAC
250VAC
Ampere range:
0.032 – 15A
0.200 – 6.3A
0.050 – 10A
0.200 – 12A
35A or 10 times rated current;
1500A
1500A
Interrupting ratings: 35A or 10 times rated current;
whichever is greater to a max of
whichever is greater
[email protected]
*.125 – 15A series pictured
5.8-6.0 MAX
(.228"-.237")
5.8 MAX
(.228")
22.5 MAX
(.886")
5.8-6.0 MAX
(.228"-.237")
22.5 MAX
(.886")
22.5 MAX
(.886")
5.8-6.0 MAX
(.228"-.237")
22.5 MAX
(.886")
Add “P” suffix when
ordering
compliant
and
parts
5 x 20mm
5 x 20mm
5 x 20mm
5 x 20mm
Slo-Blo® Type Fuse
218 Series
IEC Slo-Blo® Type Fuse
219XA Series
METI Medium-Acting
232 Series
UL/CSA Fast-Acting Type Fuse
235 Series
125/250VAC
125 – 250VAC
Voltage range:
250VAC
250VAC
1 – 10A
Ampere range:
0.32 – 15.0A
0.125 – 6.3A
1.0 – 5.0A
150A @ 250VAC
*High I2t rating
Interrupting ratings: 35A or 10 times rated current; whichever is
greater to a max of 100A @ 250VAC
*.125 – 15A series pictured
5.25
(.207")
22.5 MAX
(.886")
5.8 MAX
(.228")
0.10 – 6A
10000A @ 125VAC
.100 – 1.0A
35A @ 250VAC
6.3 – 10.0A
300A @ 125VAC
1.25 – 3.0A
100A @ 250VAC
1.0 – 10.0A
100A @ 250VAC
.100 – 6.0A
10000A @ 125VAC
22.5 MAX
(.886")
5.8 MAX
(.228")
5.8-6.0 MAX
(.228"-.237")
22.5 MAX
(.886")
Add “P” suffix when
ordering
compliant
and
parts
5 x 20mm
3.6 x 10mm
3.6 x 10mm
UL/CSA Medium-Acting Type Fuse UL/CSA Slo-Blo® Type Fuse
233/234 Series
239 Series
Fast-Acting Type Fuse
672 Series
Slo-Blo® Type Fuse
673 Series
Voltage range:
125 – 250VAC
125 – 250VAC
250V
250V
Ampere range:
1 – 10A
0.20 – 7A
0.100-10.0A
0.100 – 10.0A
50A @ 250VAC
50A @ 250VAC
Interrupting ratings: 1A – 6.3A
1A
5 x 20mm
22.5 MAX
(.886")
10000A @ 125VAC
0.20 – 7A
10000A @ 125VAC
35A @ 250VAC
0.20 – 1A
35A @ 250VAC
1.25A – 3.5A
100A @ 250VAC
4 – 10A
200A @ 250VAC
1.25 – 3.15A
100A @ 250VAC
672 000 Series
3.9 (.153")
11.0
(.433")
5.8 MAX
(.228")
22.5 MAX
(.886")
5.8 MAX
(.228")
22.5 MAX
(.886")
672 000 Series
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
3.9 (.153")
11.0
(.433")
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
Electronic Product Selection Guide
26
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Axial Leaded and Cartridge Fuses
3.6 x 10mm
3.6 x 10mm
3.6 x 10mm
3.6 x 10mm
Fast-Acting Type Fuse
674 Series
Slo-Blo® Type Fuse
675 Series
Fast-Acting Type Fuse
676 Series
Slo-Blo® Type Fuse
677 Series
Voltage range:
250V
250V
250V
250VAC
Ampere range:
0.100 – 8.0A
0.100 – 5.0A
0.050 – 6.30A
0.250 – 6.30A
50A @ 250VAC
35A or 10 times rated current;
35A or 10 times rated current;
whichever is greater @ 250VAC
whichever is greater @ 250VAC
Interrupting ratings: 50A @ 250VAC
672 000 Series
672 000 Series
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
3.9 (.153")
11.0
(.433")
3.9 (.153")
11.0
(.433")
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
672 000 Series
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
3.9 (.153")
11.0
(.433")
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
672 000 Series
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
0.6 (.024") ( 0.1 -5A)
0.8 (.031") (6 -7A)
1.0 (.039") (8 -10A)
3.9 (.153")
11.0
(.433")
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
30.0
(1.181") TYP.
Axial Lead Material: Solder coated copper.
Subminiature Cartridge Fuses
TR5®
TR5®
TR5®
TR5®
IEC Fast-Acting Type Fuse
370 Series
IEC Time Lag Type Fuse
372 Series
UL Fast-Acting Type Fuse
373 Series
UL Time Lag Type Fuse
374 Series
Voltage range:
250VAC
250VAC
250VAC
0.050 - 10.0A
Ampere range:
0.040 - 6.30A
0.040 - 6.30A
0.050 - 10.0A
50 @ 250VAC
250VAC
Interrupting ratings: 0.040 - 3.15A
35A @ 250VAC
0.040 - 3.15A
4.0A
40A @ 250VAC
4.0A
40A @ 250VAC
5.0 - 6.3A
50A @ 250VAC
5.0 - 6.3A
50A @ 250VAC
L
Holes in the printed circuit board
1 +0,1
0,5 min
∅ 8,5
0,5 min
∅ 0,6
1 +0,1
5,08
Holes in the printed circuit board
max. 8
L
∅ 8,5
∅ 0,6
0,5 min
5,08
1 +0,1
max. 8
L
∅ 8,5
∅ 0,6
Holes in the printed circuit board
50 @ 250VAC
max. 8
L
5,08
∅ 0,6
0,5 min
max. 8
∅ 8,5
5,08
1 +0,1
35A @ 250VAC
Holes in the printed circuit board
TR5®
TE5®
TE5®
TE5®
IEC Time Lag Type Fuse
382 Series
IEC Time Lag Type Fuse
392 Series
UL Fast-Acting Type Fuse
395 Series
UL Time Lag Type Fuse
396 Series
Voltage range:
250VAC
250VAC
125VAC
125VAC
Ampere range:
1.0 - 6.30A
0.800 - 6.3A
0.050 - 6.3A
0.050 - 6.30A
100A @ 125VAC
100A @ 125VAC
Interrupting ratings: 100A @ 250VAC
Breaking capacity at UR: 50A @ 320VAC
L
32A @ 250VAC
40A @ 250VAC
50A @ 250VAC
63A @ 250VAC
L
max. 4
0,5 min
1,5
∅ 0,6
1 +0,1
max. 8
8,5
5,08
max. 4
0,5 min
L
1,5
∅ 0,6
1 +0,1
Holes in the printed circuit board
max. 8
8,5
5,08
Holes in the printed circuit board
max. 4
0,5 min
L
1,5
1 +0,1
max. 8
8,5
∅ 0,6
27
3.15A
4.0A
5.0A
6.3A
5,08
∅ 0,6
0,5 min
25A @ 250VAC
max. 8
∅ 8,5
5,08
1 +0,1
Holes in the printed circuit board
0.800 - 2.50A
Holes in the printed circuit board
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Cartridge Fuses – Midget and Class CC/CD
AC
AC/DC
250 Volt
500 Volt
Fast-Acting Type Fuse
KLK Series (F60C)
Fast-Acting Type Fuse
KLKD Series
Slo-Blo® Type Fuse
FLM Series (F09B)
Slo-Blo® Type Fuse
FLQ Series
QPL
QPL
QPL
Voltage range:
600V
600V
250V
500V
Ampere range:
0.10 – 30A
0.10 – 30A
0.10 – 30A
0.10 – 30A
10000A @ 600VDC
10000A @ 250VAC
10000A @ 500VAC
Interrupting ratings: 100000A @ 600VAC
(capable of 200000A)
100000A @ 600VAC
(capable of 200000A)
38.1 (1.50")
10.31 (.406")
38.1 (1.50")
10.31 (.406")
10.31 (.406")
38.1 (1.50")
38.1 (1.50")
10.31 (.406")
13/8" Long
Slo-Blo®
Laminated
Fiber Body
Fast-Acting Type Fuse
BLS Series
Pin Indicating Type Fuse
FLA Series
Fast-Acting Type Fuse
BLF Series
Fast-Acting Type Fuse
BLN Series (F09A)
Voltage range:
250 – 600V
125VAC
125 – 250V
250V
Ampere range:
0.20 – 10A
0.10 – 30A
0.50 – 30A
1.0 – 30A
10000A @ rated VAC
10000A @ rated VAC
10000A @ 250VAC
QPL
Interrupting ratings: 10000A @ rated VAC
*12-30A are dual tube
34.9 (1.375")
10.31 (.406")
38.1 (1.50")
10.31 (.406")
38.1 (1.50")
10.31 (.406")
38.1 (1.50")
10.31 (.406")
Cartridge Fuses – Midget and Class CC/CD
Class CC/CD
KLQ
FLU
Fast-Acting & Time Delay Type Fuses
CCMR/KLDR/KLKR Series
Increased Time-Delay
KLQ Series
Multimeter Protection
FLU Series
Voltage range:
600VAC, 250 – 300VDC
600VAC
1000VAC/VDC
Ampere range:
0.10 – 60A
1.0 – 6.0A
1A, 15A
10000A @ rated VAC
1A [email protected]/VDC
Interrupting ratings: AC: 200000A
DC: 20000A
15A [email protected]/VDC,
*1A=OFLU.440, 15A=OFLU011.
38.1
(1.50")
6.4
(.25")
10.3
(.41")
0-30A
12.7
(.50")
38.1
(1.50")
35-60A
21.6
(.850")
3.2
(.125")
47.8
(1.880")
6.4
(.25")
10.3
(.41")
0-30A
12.7
(.50")
35-60A
21.6
(.850")
34.9 (1.375")
10.31 (.406")
34.9 (1.375")
3.2
(.125")
10.31 (.406")
38.1 (1.50")
10.31 (.406")
47.8
(1.880")
.44A
11A
Electronic Product Selection Guide
28
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Hazardous Area Fuses
Barrier Network
Safe-T-Plus
242 Series
259 Series
Voltage range:
250V
250V
Ampere range:
0.050 – 0.25A
0.062 – 1A
Interrupting ratings: 4000A @ 250VAC/VDC
50A @ 125VAC
*Axial leaded parts not RoHS compliant
300A @ 125VDC
13
(.512")
3.02
(.119")
8
(.315")
8.40
(.331")
10
(.394")
Blade Terminal and Special Purpose Fuses
ATO®
MINI®
MINI® 42V
MAXI®
Fast-Acting Type Fuse
257 Series
Fast-Acting Type Fuse
297 Series
Fast-Acting Type Fuse
997 Series
Slo-Blo® Type Fuse
299 Series
Voltage range:
32VDC
32VDC
58VDC
32VDC
Ampere range:
1.0 – 40A
2.0 – 30A
2.0 – 30A
20 – 80A
1000A @ 32VDC
1000A @ 58VDC
1000A @ 32VDC
19.05
(.75")
5.08 (.20")
10.922 (.43")
10.92
(.43")
3.81 (.15")
8.75
(.34")
8.636
(.34")
12.192 (.48")
MINI
MINI
0.825
(.033")
2.21
(.09")
2.81
(.11")
10.9
(.43")
8.85 (.35")
21.59 (.85")
5.91
(.23")
7.5
(.30")
7.37
(.29")
6.35 (.25")
29.21 (1.15")
3.81
(.15" )
LF
Interrupting ratings: 1000A @ 32VDC
12.7 (.50")
Blade Terminal and Special Purpose Fuses
MAXI® 42V
MEGA®
MIDI®
JCASE® 42V
Slo-Blo® Type Fuse
999 Series
Slo-Blo® Type Fuse
298 Series
Fast-Acting High Current Fuse
498 Series
Slo-Blo® Cartridge Fuse
995 Series
Voltage range:
58VDC
32VDC
32VDC
58VDC
Ampere range:
20 – 80A
40 – 500A
30 – 200A
20 – 60A
2000A @ 32VDC
2000A @ 32VDC
1000A @ 58VDC
*Only protector is available in ratings greater
than or equal to 300A.
*Only protector is available in 150 and 200A ratings.
Interrupting ratings: 1000A @ 58VDC
29.21
(1.15")
14.10
(.56")
5.50
(.22")
22.15
(.87")
MAX.
19.05
(.75")
21.60
(.85")
16.256
(.64")
68.58 (2.70")
12.70 (.5")
0.38 (.015)
3.3 (.13")
0.825 (.032)
0.35 (.014")
10.668
(.42")
8.00
(.31")
41
(1.61)
12
(.47)
+
10
(.394)
8
(.315)
+
+
12.00
(.47")
6.75 (.27")
1.00
(.039")
27.0
(1.06")
24.4
(.96")
18.7
(.74")
10.00
(.39")
0.38
(.015")
45
10.10
(.40")
4.40
(.1 7")
12.10
(.48")
10.00
(.39")
8.51 (.34")
29
17.37
(.68")
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Blade Terminal and Special Purpose Fuses
Cable Pro®
481
Protector
496 Series
Alarm Indicating Fuse
481 Series
Voltage range:
32VDC
125VAC/VDC
Ampere range:
60 – 200A
0.18 – 20A
Interrupting ratings: 2000A @ 32VDC
450A @ 60VDC
300A @ 125VDC (up to 15A)
300A @ 125VAC (up to 20A)
200A @ 125VDC (up to 20A)
*1.5A and above RoHS compliant
17.8 (.70")
5.3
(.21")
5.8
(.23")
1-15A
19.6
(.77")
11.7
(.4
5.3
(.21")
5.8
(.23")
16.9
(.665") MAX.
20A
LE
Fuseholders
482
Alarm Indicating
482 Series
International
Shock-Safe
Flip-Top
Shock-Safe
345 Series
346/286 Series
Shock-Safe
245 Series
Mounting Type:
PCB and Panel
Panel Mount
Panel Mount
Panel Mount
Fuse Type:
481 Alarm Indicating
• Single pole and gangable
versions available (1-15A)
• 20A version is single pole only
3AG, 5x20mm, 2AG
3AG, 5x20mm, 2AG
2AG
21.3
(.84")
15.7
(.62")
19.8
(.78" .03 )
TYP
E F
.090" x .160"
HOLE
.60" DIA.
FUS
81.5
(.73")
US
1.50" MAX.
FUS
.50" MIN.
High Profile Scr
ewd river Slot Knob
Shock-Safe
Shock-Safe
345 Series
571 Series
.475"
.480"
FUS
US
E
.60" DIA.
FUS
.16"
Quick Mount Sc
´ Knob
rewdrive r Slot
E F
FUS
PC Board Mount
Panel Mount
Fuse Type:
3AG, 5x20mm, Midget
Midget
.19"
.91" DIA.
Snap Mount
1.59"
.16"
1.72" DIA.
(2)
.598"
.602"
.698"
.702"
.85"
.92"
DIA.
.48"
.12"
1.12"
2.40"
.040"
SPECIAL
1/2" THREAD
3AG
.49"
.20"
.24"
Blown Fuse
Indicating Type
344 Series
Indicating Type
344 Series
Snap Mount
Panel Mount
3AG
3AG
Plastic He x Nut with F lange
1.59"
.60" DIA.
E
Mounting Type:
.44"
Blown Fuse
A
B
C
.53" .30" .020"
.59" .36" .032"
.65"
DIA.
.63"
US
1.77"
.187" QC
.250" QC
" Push -O n" Ty pe R etaining Nut
for Quick Mount F useholder
.04"x.25"
.110"
B
C
A
348 Series
special 1/2" thread
.46" REF.
1/4" NEMA/DIN
QUI CK CONNECT
Bottom Terminal
Straight
R ight A ngle
Low Profile
1.35"
.40"
.250"
.460"
.465"
.500"
.505"
Low Pr ofile Scre wdriver Slot Knob
.04"x.25"
.187"
3/16" NEMA
QUI CK CONNECT
Sugg ested Mounting Holes
special 1/2" thread
.60" DIA.
E
E F
US
E F
.51"
.187"
3/16" DUAL
PURPOSE
SOLDER/QUICK
CONNECT
.04"x.25"
.63" DIA.
(NUT DIA)
.93" REF.
.070"
HOLE
.055"
HOLE
1.59"
.65" DIA.
E
E F
?
.38"
Ter minal Styles
special 1/2" thread
US
E
24.9
(.98" .03 )
1.31"
1.75"
FUSE
.28"
1.95" (WITH
FUSE ASSEMBLED)
.558"
HEX.
1.95" (WITH
FUSE ASSEMBLED)
.53"
.85"
.94"
.87"
.42"
.87"
.42"
2.67" MAXIMUM
WITH FUSE INST ALLED
PRESS
STAND ARD MOUNTING
(FLANGE IN FRONT OF P
ANEL)
.242"
.246"
.056"
DIA.
.627"
.635"
.15" MAX
.890"
1.310"
.446"
2 MOUNTING
HOLES FOR
No. 8 SCREWS
RUB BER WASHER
LOCK WASHER
HEX NUT
.567"
.575"
.11"
DIA.
.94"
Electronic Product Selection Guide
.81"
2.38" MAXIMUM
WITH FUSE INST ALLED
30
.09" x .13"
HOLE IN SIDE
TERMINAL
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Fuseholders
Traditional
RF Shielded
Watertight
342 Series
282 Series
342 Series
QPL
QPL
RF Shielded/
Watertight
“Push-On”
Retaining Nut
340 Series
281 Series
QPL
Mounting Type:
Panel Mount
Front/Rear Panel
Panel Mount
Panel Mount
Chassis Mount
Fuse Type:
3AG
MICRO™ Fuse Plug-ins
3AG
3AG
MICRO™ & PICO®II Fuses
.90" REF.
.69" DIA.
.7"
1.31"
2.35" MAX.
.94"
DIA.
.7"
.69"
HEX
FLATS
1"
.45" REF.
1.3 "
.81"
.69"
HEX
FLATS
.25"
1"
MAX.
.46" .015"
.190"
.193 "
.158"
.160 "
.7"
.78"
1"
1"
.3"
.4"
Vertical/Horizontal
.020"
281 Series
.032"
Twist-Lock
Heavy-Duty Bayonet Special Type
For LT-5™ Fuses
155 Series
155 Series
150 Series
280 Series
.475"
.480"
.502"
.510"
Mounting Type:
PC Board Mount
In-Line Mount
In-Line Mount
In-Line Mount
PC Board Mount
Fuse Type:
MICRO™ & PICO®II Fuses
Low Voltage 3AG, SFE
Low Voltage 3AG
2AG, 5x20mm
LT-5 (662 – 665 Types)
*For new designs use the 560 series
09. 5
4.3
45
8.5
.046" TYP.
.10"
REF.
2.19"
.60"
.032"
.25"
DIA.
.095"
.105"
.69"
.42" DIA.
.23"
.18 "
.23"
.195"
.205"
2.08"
1.84"
.050" DIA.
.055" HOLES
(2)
.219" REF.
.229"
MEGA® Fuse
Fuseholder
MIDI® Fuse
Fuseholder
MAXI® Fuse
Fuseholder
ATO® Fuse
Fuseholder
MINI® Fuse
Fuseholder
298x000 Series
498900 Series
152 and MAH Series
FHA and FHAC Series
FHM Series
Mounting Type:
Bolt-down
Bolt-down
In-Line Mount
In-Line Mount
PC Board Mount
Fuse Type:
MEGA® Fuses
MIDI® Fuses
MAXI® Fuses
ATO® Fuses
MINI® Fuses
*Contact Littelfuse for availability of RoHS
compliant and Lead-free parts
*Contact Littelfuse for availability of RoHS
compliant and Lead-free parts
31
*For new designs use the 560 series
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Fuseholders
For TR5® and
TE5® Fuses
For ATO® Fuses
For ATO® Fuses
For MINI® Fuses
For MINI® Fuses
560 Series
155 Series
445 Series
153 Series
153 Series
Mounting Type:
PC Board Mount
In-Line Mount
PC Board Mount
In-Line, Easy Crimp
PC Board Mount
Fuse Type:
TR5® Fuses (370, 372, 373, 374
and 382 series)
ATO® Fuses
ATO® Fuses
MINI® Fuses
MINI® Fuses
TE5® Fuses (392, 395 and 396 series)
22
(.866")
.680"
.300"
17.02 (.67")
.75"
1.20"
.680"
17.02
(.67")
MATTED
(CRIMP) AREA
1.46"
6.35 (.25")
.508"
F
32 V
®®
9
(.354")
4.5
(.177") Ref.
®®
52.58
(2.07") Max
11.43
(.45")
END VIEW
Over all height with fuse installed is 1.0" Ref
15 A
10 A
.152"
SIDE VIEW
.30"
.
Fuse Blocks and Clips
2AG OMNI-BLOK®
Fuse Block
Metric OMNI-BLOK® 3AG OMNI-BLOK®
Fuse Block
Fuse Block
600 Volt
254 Series
520 Series
354 Series
L600 Series
Molded Base
Molded Base
Molded Base
Molded Base
2AG
5 x 20mm
3AG
11/2" long Midget, CC
.190" x .187" deep
C bore with .050 "
material remaining
.50" typ.
.090" REF. DIA. Thru
.110" typ.
Mounting Type:
Fuse Type:
.35" typ.
.450"
centers typ.
B
Solder type terminals
feature elongated
hole on clip
.70" typ.
1.22"
REF.
.016"
REF.
45
.53"
REF.
.24" REF.
.70"
REF.
.312" REF. DIA. C BORE
.06" REF. DEEP (.10 REMAINS)
10A
.110"
X X
.35"
REF.
X X
520
1.44"
.53" REF.
45°
520 003
.04"
REF.
.19"
REF.
.92"
.54"
A
.50"
.146" REF.
DIA. THRU
.50"
.625"
TYP.
1.46"
REF.
X X
.81"
REF.
.016"
X X
.50"
REF.
X X
520 005-GY
45°
.54"
X X
.016"
.040 DIA.
45° .55" MAX.
.08" REF.
3AG Screw
Terminal
1/4"–13/16" Diam.
Fuses
Mounting Type:
Laminated Base
Rivet/Eyelet Mount
Rivet/Eyelet Mount
Fuse Type:
3AG
3AG, Midget, NEC 1-60 amp
3AG
.428"
.92"
.40"
1.4"
2.19" REF.
1/4" Diam. Fuses
.25"
TYP.
.08" REF. DIA.
.156" DIA.
.10" DIA.
1/4" Diam. Fuses
Various Diam.
Fuses
P.C. Board
Traditional
P.C. Board
ATO® Fuse
2AG or 5mm
5mm
5mm, Auto.
Insertion Type
101 Series
.65"
Low Profile (2)
Bowed Tab
Electronic Product Selection Guide
32
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Overvoltage Suppression Products
PulseGuard® Polymeric ESD Suppressors
PGD Series
PGB Series
PGB1 Series
0-24VDC
0-24VDC
0-24VDC
Peak Current:
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
<1.0nA
<1.0nA
10MΩ
10MΩ
Clamping:
100V,[email protected]
150V,[email protected]
0805
4-line protection
Reference Dimensions:
Dimensions:
Reference
2.24 (.088")
Reflow Solder
Reflow Solder
1.01 (.040")
1.01 (.040")*
Reference Dimensions:
2.29
0.787 (.031")1.01 (.040")
(.090")
0.254 (.010") MIN
0.356 (.014")
1.04
(.041") REF
Wave
Solder
Reflow
Solder
150V,[email protected]
0.508 (.020")
1.27
(.050")
1.01 (.040")
0.635 (.025")
0.635 (.025")
1.60 (.063")
1000V
1000V
500V
Package Type:
Connector Array
0603, SOT23, 0805
0603, SOT23, 0805
0.635
(.025")
0.076
0.406 (.016") TYP
0.406 (.016") TYP
0.81
(.032") REF
Equivalent Circuit
0.356 (.014")
3.30 (1.30")
3
Wave
Solder
0.508 (.020")
0.762 (.030")
0.203
0.203
(.008") TYP
(.008") TYP
0.127
0.127
(.005") TYP
(.005") TYP
NOTE: When wave soldering,
the gap between pads should be
(.003") MIN
NOTE: When wave soldering,
the(TYP)
gap between pads should be
covered
with photo-imageable solder mask to prevent bridging
0.787 (.031")
covered
with photo-imageable solder mask to prevent bridging
between terminations under the component. Also the spacing
between terminations under the component. Also the spacing
between the ground contacts0.762
should be increased from
between the ground contacts should be increased from
(.030")
.635mm (.025") to .889 (.035").
.635mm (.025") to .889 (.035").
Note: For wave solder, increase the spacing
in both the horizontal and vertical dimensions by
Reflow
1.27 (.050")
Solder
1.27 (.050")
1.27
1.27
(.050") TYP
(.050") TYP
0.51 (.020")
0.51 (.020")
0.279
0.279
(.011")
(.011")
0.74
0.74
(.029")
(.029")
2.032 (.080")*
0.51
(.020")
0.254 (.010") MIN
3.05 (1.20")
2.997
(.118")
2.032
(.080")
0.076 (.003") MIN
0.762 (.030")
0.254 (.010") where denoted by an asterisk (*)
Trigger Voltage:
1.27
1.27
(.050")
(.050")
0.74
0.74
(.029")
(.029")
1.27
(.050")
2.03 (.080") TYP
2.03 (.080") TYP
0.71 (.028")
0.71 (.028")
Reflow
0.076 (.003") MIN
Solder
1.04
(.041") REF
Leakage Current:
Offstate Resistance: 10MΩ
2-line protection
1.60 (.063")
Typ. Capacitance (Co): <[email protected]
<0.1µ[email protected]
SOT23
1-line protection
Reference Dimensions:
Reference Dimensions:
Operating Voltage:
0603
1
1
Equivalent Circuit
Circuit
Equivalent
6
6
0.762 (.030")
0.762 (.030")
1
3.05 (1.20")
2
3.30 (1.30")
Equivalent Circuit
2
2
1.27 (.050")
1
5
5
1.27 (.050")
2
0.762 (.030")
0.762 (.030")
4
4
3
3
Equivalent Circuit
2
1
Multilayer Varistors
Operating Voltage:
MHS Series
ML Series
MLE Series
MLN Series
AUML Series
0 – 42 VDC
2.5-107 VAC
0-18 VDC
0-18 VDC
18 VDC
N/A
3.5-120 VDC
Peak Current:
N/A
4-500A
20A
30A
Leakage Current:
<1µA
<25µA
<25µA
<30nA
Peak Energy:
N/A
0.02-2.5J
0.5J
0.05-0.1J
N/A
Lines Protected:
1
1
1
4
1
Capacitance (Co):
3, 12pF
40-6000pF
40-1700pF
45-430pF
Package Size
0402, 0603
0402-1210
0402-1206
0805, 1206
SPO5x Series
SP72x Series
SPUSBx Series
TVS Avalanche Diode
SCR/Diode Array
Upstream USB Port Terminator
with ESD suppression and EMI
Filtering
1-30VDC
5.5 VDC
1206-2220
Diode Arrays
Maximum Operating 5.5 VDC
Voltage:
Leakage Current:
<100nA
<20nA
<100nA
Lines Protected:
2,3,4,5,6
4,6,14
3
Capacitance (Co):
30pF
3-5pF
47pF
Package Size
SC70, SOT23, SOT143,
DIP, SOIC, SOT23
SC70-6
TSSOP-8, MSOP-8
33
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Protection Thyristors
Add “L” suffix when
ordering
compliant
SIDACtor® and Battrax®
devices
Through-hole
SIDACtor®
Devices
Through-hole
SIDACtor®
Devices
SIDACtor® HighSpeed SIDACtor®
Communication
Fixed Voltage SLIC
Protector
Protectors
T10A, T10B Series
T10 C Series
Pxxx2Sx, PxxxxCA,
P0220Sx Series
Pxxx1Sx, Pxxx1CA2, Pxxx1Ux
Series
70-240
15-275
58-160
DO-214AA, Mod DO-214AA, Mod MS-013
Maximum Operating 32-243
Voltage:
Form Factor:
T10A=DO-15, T10B=DO-201
3 pin ‘gas tube’
DO-214AA
Capacitance (Co):
T10A: <100pF
<200pF
10-150pF
Surface Mount
Multiport
SIDACtor® Devices
Through-Hole
SIDACtor® Devices
Through-Hole
SIDACtor® Devices
Pxxx3Ux, Pxxx4Ux,
Pxxx6Ux Series
Pxxx0AA61, Pxxx2A,
Pxxx2AC MC, Pxxx3A,
Pxxx3AC MC Series
PxxxxEx, PxxxEx MC
Series
6-420
25-420
6-320
170-400
T10B: <200pF
Add “L” suffix when
ordering
compliant
SIDACtor® and Battrax®
devices
Surface Mount
SIDACtor® Devices
PxxxxSx, Pxxx2CA,
PxxxxSC MC, PxxxxSA
MC Series
Maximum Operating 6-320
Voltage:
Asymmetrical
Multiport
SIDACtor® Devices
AxxxxUx6 Series
Form Factor
DO-214AA
Mod MS-013
Mod TO-220
TO-92
Mod MS-013
Capacitance (Co):
15-220pF
10-250pF
10-250pF
15-260pF
10-70pF
Add “L” suffix when
ordering
compliant
SIDACtor® and Battrax®
devices
LCAS Asymmetrical
Discrete SIDACtor®
Devices
Battrax® SLIC
Protectors
CATV and HFC
SIDACtor® Device
Bxxx0C_, Bxx1Ux,
B3xxx4Ux, B1xxx1Ux4
Series
Pxx00AD, Pxxx0NE,
Pxxx0RE Series
CATV Line Amplifier/
Power Inserter
SIDACtor® Device
Pxx00Sx Series
Maximum Operating 100-230
Voltage:
Form Factor
DO-214AA
Capacitance (Co):
20-110pF
PxxxxME Series
Maximum Operating 200
Voltage:
120-550
140-180
Peak Pulse Current: 45-500A
Form Factor:
Mod DO-214AA, Mod MS-013
1000-3000A
5000A
TO-263, TO-220
TO-218
Capacitance (Co):
150-260pF
750pF
50-200pF
Electronic Product Selection Guide
34
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TVS Diodes
Through-hole
TVS Diode
Surface Mount
TVS Diode
SA, P6KE, 1.5KE, 5KP,
15KP, P4KE, LCE, SLD
Series
SMBJ, P6SMBJ,
1KSMBJ, SMAJ, P4SMA,
SMCJ, 1.5SMC Series
High-Power TVS Diode
AK6, AK10 Series
Maximum Operating 5-467
Voltage:
5-550
58-470
Peak Pulse Current: 0.52-544A
0.5-163A
6000A - 10000A
Form Factor:
Axial leaded
DO-214 AA, DO- 214 AB, DO-214AC
Axial leaded
Peak Pulse Power:
400W to 15,000W
400W to 1500W
5000W +
Gas Plasma Arresters (improved GDTs)
Greentube™ Alpha
Ultra Performance
Hybrid
SL1122A Series
Greentube™ Beta
High Performance
SL1011A, SL1011B,
SL1021A, SL1021B Series
Greentube™
Mini Beta
High Performance
Greentube™
Omega Range
Delta Range
SL1026 Series
SL1024B, SL1024A Series
SL1002A, SL1003A Series
Peak Pulse Current: 10000A
5000A-10000A
5000A
10000A
40000A
Form Factor:
2 terminal axial & button,
3 terminal radial
2 terminal SMT, 3 terminal radial
2 terminal axial & button, 3
terminal radial
3 terminal clip-mounted, 3
terminal radial
Nom. DC Breakover 90-450
Voltage:
75-600
90-600
90-600
275-1100
Capacitance (Co):
≤1pF
1.2pF
≤1pF
2.5pF
3 terminal radial
100-200pF
Gas Plasma Arresters (improved GDTs)
Greentube™
Mini Beta High
Performance
Greentube™
Delta High
Performance
SL0902 Series
SL1411Series
Beta High
Performance GDT
HV Series
Peak Pulse Current: 2500A
2 terminal SMT and
Form Factor:
axial lead through-hole
10000A
2 terminal SMT and
axial lead through-hole
3000A
Nom. DC Breakover 90-420V
Voltage:
184-360V
1500-2750V
Capacitance (Co):
35
1.0pF
2 terminal through-hole
<1pF
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Industrial Varistor Products
Add “P” suffix when
ordering
compliant
and
parts
TMOV®/iTMOV®
UltraMOV™
Varistor Series
Varistor Series
Operating Voltage:
115-750 VAC
130-625 VAC
C-III Series
LA Series
ZA Series
130-660 VAC
130-1000 VAC
4-460 VAC
175-1200 VDC
5.5-615 VDC
170-825 VDC
Peak Current:
6000-10000A
1750-10000A
3500-9000A
1200-6500A
50-6500A
Peak Energy:
35-480J
12.5-400J
40-510J
11-360J
0.1-52J
Mount/Form Factor: Radial Leaded
Radial Leaded
Radial Leaded
Radial Leaded
Radial Leaded
Disc Size
14, 20mm
7, 10, 14, 20mm
10, 14, 20mm
7,10,14, 20mm
5, 7, 10, 14, 20mm
Indicating:
iTMOV Varistor Only
N/A
N/A
N/A
N/A
MA Series
RA Series
CH Series
CA Series
NA Series
PA Series
9-264 VAC
4-275 VAC
14-275 VAC
130-2800 VAC
130-750 VAC
130-660 VAC
13-365 VDC
5.5-369 VDC
18-369 VDC
175-3500 VDC
175-970 VDC
175-850 VDC
Peak Current:
40-100A
150-6500A
250-500A
20000-70000A
40000A
6500A
Peak Energy:
0.06-1.7J
0.4-160J
1-23J
200-10000J
270-1050J
70-250J
Mount/Form Factor: Axial Leaded
Packaged
Surface Mount
Bare Disc
Bare Disc
Packaged
Disc Size
3mm
8, 6, 22mm
N/A
32, 40, 60mm
34mm
20mm
TMOV34S®
Varistor Series
HB34, HF34,
HG34 Series
DHB34 Series
HA Series
DA/DB Series
BB/BA Series
115-750 VAC
110-750 VAC
110-750 VAC
110-750 VAC
130-750 VAC
130-2800 VAC
150-970 VDC
148-970 VDC
148-970 VDC
148-970 VDC
175-970 VDC
175-3500 VDC
Peak Current:
40000A
40000A
40000A
25000-40000A
40000A
50000-70000A
Peak Energy:
235-1050J
220-1050J
220-1050J
160-1050J
270-1050J
450-10000J
Mount/Form Factor: Packaged
Packaged
Packaged
Packaged
Industrial Packaged
Packaged
Disc Size
34mm
34mm
32, 40mm
40mm
60mm
Operating Voltage:
Operating Voltage:
34mm
Electronic Product Selection Guide
36
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Switching Product
Descriptions
Gas Plasma
Switching Devices
The gas plasma trigger switches are twoterminal, bi-directional voltage triggered
switching devices. Switching voltages
are fixed depending on the part number
selected. The gas discharge technology
affords very fast switching speeds,
allowing for significantly better di/dt values
compared to those available when using
silicon devices. These devices also allow
for reduced stepup transformer sizes,
saving size, weight, and money.
Thyristors
A thyristor is any semiconductor switch
with a bi-stable action depending on p-np-n regenerative feedback. Thyristors are
normally two- or three-terminal devices
for either unidirectional or bidirectional
circuit configurations. Thyristors can
have many forms, but they have certain
commonalities. All thyristors are solid
state switches that are normally open
circuits (very high impedance), capable
of withstanding rated blocking/off-state
voltage until triggered to on state.
When triggered to on state, thyristors
become a low-impedance current path
until principle current either stops or drops
below a minimum holding level. After a
thyristor is triggered to on-state condition,
the trigger current can be removed
without turning off the device. Thyristors
are used to control the flow of electrical
currents in applications including:
• Home appliances (lighting, heating,
temperature control, alarm activation,
fan speed)
• Electrical tools (for controlled actions
such as motor speed, stapling event,
battery charging)
• Outdoor equipment (water sprinklers,
gas engine ignition, electronic displays,
area lighting, sports equipment,
physical fitness)
37
Sensitive Triacs
Teccor® brand sensitive gate triacs are AC
bidirectional silicon switches that provide
guaranteed gate trigger current levels in
Quadrants I, II, III, and IV. Interfacing to
microprocessors or other equipment with
single polarity gate triggering is made
possible with sensitive gate triacs. Gate
triggering currents of 3 mA, 5 mA,10 mA,
or 20 mA may be specified. Sensitive gate
triacs are capable of controlling AC load
currents from 0.8 A to 8 A rms and can
withstand operating voltages from 200 V
to 600 V.
Triacs
Teccor ® brand triac products are
bi-directional AC switches, capable of
controlling loads from 0.8 A to 35 A rms
with 10 mA, 25 mA, and 50 mA IGT in
operating Quadrants I, II and III. Triacs
are useful in full-wave AC applications to
control AC power either through full-cycle
switching or phase control of current to
the load element. These triacs are rated to
block voltage in the “OFF” condition from
200 V minimum with selected products
capable of 1000 V operation. Typical
applications include motor speed controls,
heater controls, and incandescent light
controls.
QUADRAC® Devices
Teccor® brand Quadrac devices are triacs
and alternistor triacs with a diac trigger
mounted inside the same package. These
devices save the user the expense and
assembly time of buying a discrete diac
and assembling in conjunction with a
gated triac. Quadrac devices are offered
in capacities from 4 A to 15 A rms and
voltages from 200 V ac to 600 V ac.
Alternistor Triacs
The Teccor® brand alternistor is specifically
designed for applications required to
switch highly inductive loads. The design
of this special chip effectively offers the
same performance as two thyristors
(SCRs) wired inverse parallel (back-toback). This new chip construction provides
the equivalent of two electrically-separate
SCR structures, providing enhanced
dv/dt characteristics while retaining the
advantages of a single-chip device. Teccor
manufactures 6 A to 40 A alternistors with
blocking voltage rating from 200 V to 1000
V. Alternistors are offered in TO-220,
TO-218, and TO-218X packages with
isolated and non-isolated versions.
Sensitive SCRs
Teccor's sensitive gate SCRs are
silicon-controlled rectifiers representing
the best in design, performance, and
packaging techniques for low- and
medium-current applications. Anode
currents of 0.8 A to 10 A rms can be
controlled by sensitive gate SCRs with
gate drive currents ranging from 12 µA to
500 µA. Sensitive gate SCRs are ideally
suited for interfacing to integrated circuits
or in applications where high current
load requirements and limited gate drive
current capabilities exist. Examples include
ignition circuits, motor controls, and DC
latching for alarms in smoke detectors.
Sensitive gate SCRs are available in
voltage ratings to 600 VAC.
SCRs
Teccor® brand SCR products are halfwave, silicon-controlled rectifiers that
represent the state of the art in design
and performance. Load current capabilities
range from 1 A to 70 A rms, and voltages
from 200 V to 1000 V may be specified to
meet a variety of application needs.
Because of its unidirectional switching
capability, the SCR is used in circuits where
high surge currents or latching action is
required. It may also be used for halfwave-type circuits where gate-controlled
rectification action is required. Applications
include crowbars in power supplies,
camera flash units, smoke alarms, motor
controls, battery chargers, and engine
ignition. Surge current ratings are available
from 30 A in the TO-92 packaging to 950 A
in the TO-218X package.
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Rectifiers
applications include gate triggers for light
controls, dimmers, power pulse circuits,
voltage references in AC power circuits,
and triac triggers in motor speed controls.
Littelfuse manufactures 15 A to 25 A rms
rectifiers with voltages rated from 200 V to
1000 V. Due to the electrically isolated TO220 package, these rectifiers may be used
in common anode or common cathode
circuits using only one part type, thereby
simplifying stock requirements.
Sidacs
Sidacs represent a unique set of thyristor
qualities. The sidac is a bidirectional voltage
triggered switch. Some characteristics of
this device include a normal 95 V to 330 V
switching point, negative resistance range,
latching characteristics at turn-on, and a
low onstate voltage drop. One-cycle surge
current capability up to 20 A makes the
sidac an deal product for dumping charged
capacitors through an inductor in order to
generate high-voltage pulses. Applications
include light controls, high-pressure
sodium lamp starters, power oscillators,
and high-voltage power supplies.
Diacs
Diacs are trigger devices used in phase
control circuits to provide gate pulses to
a triac or SCR. They are voltage-triggered
bidirectional silicon devices housed in
DO-35 glass axial lead packages and
DO-214 surface mount packages. Diac
voltage selections from 27 V to 70 V
provide trigger pulses closely matched
in symmetry at the positive and negative
breakover points to minimize DC
component in the load circuit. Some
BILATERAL VOLTAGE
SWITCH
GAS PLASMA
SWITCH
SIDAC
2
1
REVERSE BLOCKING
THYRISTOR
RECTIFIER
RECTIFIER
SCR (Sensitive)
1
BILATERAL
VOLTAGE TRIGGER
1
1
DIAC
GATE CONTROL
GATE CURRENT
12-500 µA
BIDIRECTIONAL
THYRISTOR
DIAC TRIGGER
10-50 mA
SCR
DIRECT
OPTIONS
1
QUADRANT OPERATION
(See Quadrant Chart on Data Sheet)
INTERNAL EXTERNAL
DIACS
QUADRAC
1. For detailed information, see specific data sheet in product catalog.
2. For use in high temperature applications requiring a more robust device
I
III
GATE CURRENT
10-100 mA
1
1
ALTERNISTOR TRIAC
II
1
TRIAC
1
I
II
III
IV
GATE CURRENT
3-20 mA
SENSITIVE TRIAC
1
Electronic Product Selection Guide
38
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Switching Devices
Package Code
Sensitive Triac
Triac
Quadrac
Alternistor
Sensitive SCR
SCR
Rectifier
Diac
Sidac
G
Y
S
C
T
E
L*
K*
XT, VS, LT
DO-15
DO-35
DO-214
Compak
SOT-223
TO-92 *
TO-220
TO-218
•
•
•
•
•
•
Current
(Amps)
Product Type
Gas Plasma
Trigger Switch
N/A
•
400
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
0.8
1
4
6
8
0.8
1
4
6
8
10
15
25
35
4
6
8
10
15
6
8
10
12
16
25
30
35
40
0.8
1.5
4
6
8
10
1
6
8
10
12
15
16
20
25
35
40
55
65
70
15
20
25
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
*Indicates these packages have isolated mounting tabs and are UL recognized for 2500 VAC between leads and mounting tabs
39
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
J*
TO-218x
P*
TO-3 Fastpak
F
TO-202
R
TO-220
M
TO-218
W
TO-218x
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
D
TO-252 D-Pak
V
TO-251 V-Pak
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Package Code
Current
(Amps)
Product Type
400
Gas Plasma
Trigger Switch
TO-263 D2Pak
•
•
•
•
•
•
•
•
•
•
N
•
•
0.8
1
4
6
8
0.8
1
4
6
8
10
15
25
35
4
6
8
10
15
6
8
10
12
16
25
30
35
40
0.8
1.5
4
6
8
10
1
6
8
10
12
15
16
20
25
35
40
55
65
70
15
20
25
Sensitive Triac
Triac
Quadrac
Alternistor
Sensitive SCR
SCR
Rectifier
Diac
Sidac
•
Electronic Product Selection Guide
40
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Index
Product
Page
Number
Product
Page
Number
Product
Page
Number
Product
Page
Number
100 000 Series
101 000 Series
102 000 Series
105 000 Series
107 000 Series
109 000 Series
111 000 Series
1206L 000 Series, PTC
121 000 Series
122 000 Series
125 000 Series
127 000 Series
129 000 Series
150 000 Series
152 000 Series
153 002
153 003
153 007
153 008
153 009
154 000 Series
154 000T Series
155 000 Series
155 100 Series
155 300 Series
155 400 Series
1812L 000 Series, PTC
202 000 Series
203 000 Series
213 000 Series
215 000 Series
216 000 Series
217 000 Series
218 000 Series
219 000 Series
220 007
224/225 000 Series
229 000 Series
230 000 Series
232 000 Series
233 000 Series
234 000 Series
235 000 Series
239 000 Series
242 000 Series
245 001
245 002
251/253 000 Series
252 000 Series
254 000 Series
257 000 Series
259 000 Series
262 000 Series
263 000 Series
265 000 Series
266 000 Series
267 000 Series, Military
268 000 Series
269 000 Series, Military
272 000 Series
273 000 Series
274 000 Series, Military
278 000 Series
279 000 Series
280 000
281 000 Series
282 000 Series
29
32
29
29
29
29
29
22
29
29
28
29
29
31
31
32
32
32
32
32
23
23
31-32
31-32
31-32
31-32
22
24
24
26
26
26
26
26
26
24
24
24
24
26
26
26
26
26
29
30
30
24
20
32
29
29
25
24
25
25
25
25
25
25
25
25
25
25
31
31
31
286 377
286 677
297 000 Series
298 000 Series
298x000 Series
299 000 Series
30R 000 Series, PTC
312 000 Series
313 000 Series
313 000 S Series
314 000 Series
315 000 Series
318 000 Series
322 000 Series
324 000 Series
325 000 Series
326 000 Series
340 000 Series, Military
340 300
342 000 Series
342 000 Series, Military
344 000 Series
344 000P Series
344 400 Series
344 400P Series
344 600 Series
344 800 Series
345 101
345 121
345 200 Series
345 300 Series
345 500 Series
346 877
348 000 Series
354 000 Series
356 000 Series
359 000 Series
370 000 Series
370 0000000 Series
372 0000000 Series
373 0000000 Series
374 0000000 Series
382 0000000 Series
392 0000000 Series
393 0000000 Series
395 0000000 Series
396 0000000 Series
429 000 Series
430 000 Series
433 000 Series
434 000 Series
435 000 Series
445 000
446/447 000 Series
448 000 Series
449 000 Series
451/453 000 Series
452/454 000 Series
455 000 Series
459 000 Series
460 000 Series
461 000 Series
464 000 Series
465 000 Series
466 000 Series
467 000 Series
468 000 Series
30
30
29
29
31
29
22
25
25
25
25
25
25
25
25
25
25
31
31
31
31
30
30
30
30
30
30
30
30
30
30
32
30
30
32
29
29
27
27
27
27
27
27
27
27
27
27
22
22
22
22
22
32
23
23
23
23
23
23
24
24
23
23
23
22
22
22
471 000 Series
473 000 Series
481 000 Series
482 000 Series
496 000 Series
498 000 Series
498 900 Series
520 000 Series
560 000 Series
571 000 Series
571 000P Series
60R 000 Series, PTC
672 000 Series
673 000 Series
674 000 Series
675 000 Series
676 000 Series
677 000 Series
995 000 Series
997 000 Series
999 000 Series
Battrax® Devices
Bxxx0C_
Bxx1Ux
B3xxx4Ux
Blxxx1Ux4
BLF 000 Series
BLN 000 Series
BLS 000 Series
CCMR 000 Series
Diodes Arrays
SP05x
SP72x
SPUSBx
FHA 000 Series
FHAC 000 Series
FHM 000 Series
FLA 000 Series
FLM 000 Series
FLQ 000 Series
FLU 000 Series
HV Series
KLDR 000 Series
KLK 000 Series
KLQ 000 Series
KLKD 000 Series
KLKR 000 Series
KLMR 000 Series
L600 00x Series
MAH Series
Metal Oxide Varistors
C-III
CA
CH
DHB34
DA
DB
BB
BA
CA
CA
CA
HA
HB34, HF34, HG34
LA
MA
PA
24
24
30
30
30
29
31
32
32
30
30
22
26
26
27
27
27
27
29
29
29
34
34
34
34
34
28
28
28
28
33
33
33
33
31
31
31
28
28
28
28
35
28
28
28
28
28
see CCMR Series
32
31
36
36
36
36
36
36
36
36
36
36
36
36
36
36
36
36
36
RA
ZA
TMOV® Varistor
TMOV34S® Varistor
iTMOV® Varistor
UltraMOV™ Varistor
Multilayer Varistors
AUML
MHS
ML
MLE
MLN
PGB Series
PGB1 Series
PGD Series
SIDACtor® Devices
T10A
T10B
T10C
Pxxx2Sx
PxxxxCA
Pxxx1Sx
Pxxx1CA2
Pxxx1Ux
PxxxxSx
PxxxxSD
Pxxx2CA
PxxxxSCMC
PxxxxSAMC
Pxxx0AA61
Pxxx2A
Pxxx2ACMC
Pxxx3A
Pxxx3ACMC
Pxxx3Ux
Pxxx4Ux
Pxxx6Ux
PxxxxEx
PxxxExMC
AxxxxUx6
Pxx00Sx
Pxx00AD
Pxxx0AA61
Pxxx0NE
Pxxx0RE
PxxxxME
SL Series Gas Plasma
Arresters (GDTs)
Thyristors
TVS Diodes
SA
P6KE
1.5KE
5KP
15KP
LCE
P4KE
SMAJ
SMBJ
SMCJ
P4SMA
P6SMBJ
IKSMBJ
1.5SMC
SLD
AK6
AK10
36
36
36
36
36
36
33
33
33
33
33
33
33
33
33
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
34
41
35
37-40
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
35
Electronic Product Selection Guide
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
Helping to make the World a Cleaner Place to Live
Littelfuse and the
Environment
As members of the global community,
we at Littelfuse have always strived to
understand the impact of what we do,
and of what we create, on the world
around us. Because of this, our concern
for the environment has always been
an integral and fundamental part of our
business. We continually work to balance
our business objectives with the need to
protect and improve the local and global
environment.
Our Strategy for the Design
of Eco-friendly Products
Littelfuse has established a focused
program committed to developing highperformance eco-friendly products along
with a comprehensive set of processing/
reliability data and technical process
expertise. This includes processes for
eliminating, detecting and documenting the
presence of hazardous materials such as
•
•
•
•
•
The Littelfuse strategy for eco-friendly
products is specifically designed to help
support our worldwide customers in their
transition to Lead-Free processing.
All products considered to be lead-free
are marked with this symbol.
Littelfuse defines lead-free as products
which contain less than 1000ppm (0.1%)
Lead, measured by weight of the entire
product.
All RoHS compliant products are marked
with this symbol.
Littelfuse follows the requirement set
by the European Union for all RoHS
compliant products. The European Union
Directive 2002/95/EC RoHS restricts
the use of Lead, Mercury, Hexavalent
Chromium, Cadmium and Brominated
flame-retardants (PBBs and PBDEs)
Visit www.littelfuse.com/lead-free for
further information.
Lead
Cadmium
Hexavalent Chromium
Mercury
Brominated flame-retardants
(PBBs and PBDEs)
Electronic Product Selection Guide
42
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
World Headquarters
Littelfuse, Inc.
800 E. Northwest Highway
Des Plaines, IL 60016 USA
www.littelfuse.com
International Sales,
Distribution and
Engineering Facilities:
North America
• Des Plaines, Illinois USA
and Irving, Texas USA
Technical Assistance
Phone: 800 999 9445
847 824 1188
Fax: 847 391 0459
Europe
• Dünsen, Germany
Phone: +49 4244 8190
Fax: +49 4244 819 139
• Munich, Germany
Phone: +49 8955 27660
Fax: +49 8955 276 699
• Utrecht, The Netherlands
Phone: +31 30 299 9900
Fax: +31 30 299 9800
• Swindon, United Kingdom
Phone: +44 179 372 0400
Fax: +44 179 372 0401
Asia/Pacific
• Hong Kong, China
Phone: +852 2810 5099
Fax: +852 2810 5500
• Beijing, China
Phone: +86 10 8454 9408
Fax: +86 10 8454 9409
• Shanghai, China
Phone: +86 21 5383 8016
Fax: +86 21 5383 7476
• Shenzhen, China
Phone: +86 755 8207 0760
Fax: +86 755 8207 0759
• Singapore
Phone: +65 6885 9111
Fax: +65 6885 9113
Research and
Manufacturing Facilities:
• Arcola, Illinois USA
• Des Plaines, Illinois USA
• Dongguan, China
• Dundalk, Ireland
• Dünsen, Germany
• Grenchen, Switzerland
• Irving, Texas USA
• Lipa City, Philippines
• Matamoros, Mexico
• Piedras Negras, Mexico
• Siemianowice Slaskie, Poland
• Suzhou, China
• Swindon, United Kingdom
• Witten, Germany
• Shin-Yokohama, Japan
Phone: +81 45 478 1088
Fax: +81 45 478 1089
• Seoul, Korea
Phone: +82 2 6000 8600
Fax: +82 2 6000 8655
• Taipei, Taiwan
Phone: +886 2 8751 1234
Fax: +886 2 8751 1177
Central and South America
• São Paulo, Brasil
Phone: +55 113 835 3780
Fax: +55 113 645 0612
FORM NO. EC102-E
© January 2006, Littelfuse Inc. Printed in U.S.A.
Specifications, descriptions and illustrative material in this literature are as accurate as known at the time of
publication, but are subject to change without notice.
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
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