ACST4
Datasheet
4 A - 800 V overvoltage protected AC switch
COM
G
DPAK
G
OUT
TO-220FPAB
G
OUT
COM
OUT
COM
Product status link
ACST4
Product summary
I
T(RMS)
V
DRM
/V
RRM
I
GT
(ACST410)
I
GT
(ACST435)
4 A
800 V
10 mA
35 mA
Features
• Triac with overvoltage protection
• Low I
GT
(<10 mA) or high immunity (I
GT
< 35 mA) version
• High noise immunity: static dV/dt > 1000 V/μs
• TO-220FPAB insulated package:
– complies with UL standards (File ref : E81734)
– insulation voltage: 2000 V
RMS
• Benefits:
– Enables equipment to meet IEC 61000-4-5
– High off-state reliability with planar technology
– Needs no external overvoltage protection
– Reduces the power passive component count
– High immunity against fast transients described in IEC 61000-4-4 standards
Applications
• AC mains static switching in appliance and industrial control systems
• Drive of medium power AC loads such as:
– Universal drum motor of washing machine
– Compressor of fridge or air conditioner
Description
The ACST4 series belongs to the ACS / ACST power switch family. This high performance device is suited to home appliances or industrial systems and drives loads up to 4 A.
This ACST4 switch embeds a Triac structure with a high voltage clamping device to absorb the inductive turn-off energy and withstand line transients such as those described in the IEC 61000-4-5 standards. The ACST410 needs a low gate current to be activated (I
GT
< 10 mA) and still shows a high electrical noise immunity complying with IEC standards such as IEC 61000-4-4 (fast transient burst test).
DS2762 - Rev 12 - August 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
1
ACST4
Characteristics
Characteristics
Table 1. Absolute ratings (limiting values)
Symbol Parameter Value Unit
I
T(RMS)
I
TSM
On-state rms current (full sine wave)
Non repetitive surge peak on-state current
T j
initial = 25 °C, (full cycle sine wave)
TO-220FPAB
DPAK
T c
= 102 °C
T c
= 112 °C
DPAK with 0.5 cm copper T amb
= 60 °C f = 50 Hz t p
= 20 ms f = 60 Hz t p
= 16.7 ms t p
= 10 ms I 2 t dI/dt
V
PP
(1)
P
G(AV)
P
GM
I
GM
T stg
T j
T
L
V ins
I 2 t for fuse selection
Critical rate of rise on-state current I
G
100 ns
= 2 x I
GT
, tr ≤
Non repetitive line peak pulse voltage
(1)
Average gate power dissipation
Peak gate power dissipation (t p
= 20 μs)
Peak gate current (t p
= 20 μs)
Storage temperature range
Operating junction temperature range f = 120 Hz
Lead temperature for soldering during 10 s (at 3 mm from plastic case)
Insulation rms voltage (60 seconds)
1. according to test described by standard IEC 61000-4-5, see Figure 17 for conditions
T
T
T
T
T j j j j j
= 125 °C
= 25 °C
= 125 °C
= 125 °C
= 125 °C
4
1
32
30
6
100
2
0.1
10
1.6
2000
A
A
A
2
W
A
-40 to +150 °C
-40 to +125 °C
260 °C s
A/μs kV
W
V
Symbol
Table 2. Electrical characteristics (T j
= 25 °C, unless otherwise specified)
Test conditions
I
GT
(1)
V
GT
V
GD
I
H
(2)
I
L
dV/dt (2)
(dI/dt)c
(2)
(dI/dt)c
(2)
V
CL
I
V
OUT
= 12 V, R
L
= 33 Ω
V
OUT
= V
DRM
, R
L
= 3.3 kΩ, T j
= 125 °C
I
OUT
= 500 mA
I
G
= 1.2 x I
GT
V
OUT
= 67% V
DRM
, gate open, T j
= 125 °C
Without snubber, T
CL
= 0.1 mA, t p j
= 125 °C
(dV/dt)c = 15 V/μs, T j
= 125 °C
= 1 ms
1. Minimum I
GT
is guaranteed at 5% of I
GT
max
2. For both polarities of OUT pin referenced to COM pin
Quadrant
I - II - III
I - II - III
I - II - III
Max.
Max.
Min.
Max.
Max.
Min.
Min.
Min.
Min.
ACST410
Value
ACST435
10
1.0
35
1.1
0.2
20
40
500
25
60
1000
5
2
850
Unit mA
V
V mA mA
V/μs
A/ms
A/ms
V
DS2762 - Rev 12 page 2/16
ACST4
Characteristics
Table 3. Static characteristics
Symbol
V
TM
(1)
V
T0
(1)
R
D
(1)
I
DRM
I
RRM
I
OUT
= 5.6 A, t p
= 500 μs
Threshold voltage
Dynamic resistance
V
OUT
= V
DRM
/ V
RRM
Test conditions
1. For both polarities of OUT pin referenced to COM pin
T j
= 25 °C
T j
= 125 °C
T j
= 125 °C
T j
= 25 °C
T j
= 125 °C
Max.
Max.
Max.
Max.
Symbol
Table 4. Thermal characteristics
Parameter
R th(j-c)
Junction to case for full cycle sine wave conduction
R th(j-a)
Junction to ambient
Junction to ambient, S
CU
= 0.5 cm²
(1)
1. S
CU
= copper surface under tab
DPAK
TO-220FPAB
TO-220FPAB
DPAK
Value
1.7
0.9
110
20
0.5
Value
2.6
4.6
60
70
Unit
°C/W
Unit
V
V mΩ
µA mA
DS2762 - Rev 12 page 3/16
ACST4
Characteristics (curves)
1.1
Characteristics (curves)
Figure 1. Maximum power dissipation versus RMS onstate current
4
3
2
P(W)
6
α = 180°
5
1
0
0.0
0.5
1.0
1.5
2.0
180°
2.5
3.0
IT(RMS)(A)
3.5
4.0
Figure 2. On-state RMS current versus case temperature
(full cycle)
5
I
T(RMS)
(A)
α=180°
DPAK
4
TO220FPAB
3
2
1
0
0 2 5 5 0 75
TC (°C)
100 125
0.5
0.0
0
Figure 3. On-state RMS current versus ambient temperature (free air convection, full cycle)
2.0
I
T(RMS)
(A)
α=180°
TO-220FPAB
1.5
DPAK with copper surface = 0.5 cm 2
1.0
2 5 50
Ta(°C)
75 100 125
Figure 4. Relative variation of thermal impedance junction to case versus pulse duration
1.0E+00
K = [Z th / Rth]
DPAK
Z th(j-c)
Z th(j-a)
1.0E-01
TO-220FPAB
1.0E-02
1.0E-03 1.0E-02
Tp(s)
1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
Figure 5. Relative variation of gate trigger current and gate trigger voltage versus junction temperature (typical values)
3.0
IGT, VGT[Tj] / IGT, VGT[Tj = 25 °C]
2.5
2.0
IGT Q3
1.5
1.0
V
GT
Q 1-Q2-Q3
0.5
0.0
-50 -25
IGT Q1-Q2
0 25
Tj(°C)
50 75 100 125
1.0
0.5
0.0
-50
Figure 6. Relative variation of holding current and latching current versus junction temperature (typical values)
2.5
IH, IL[Tj] / IH, IL[Tj = 25 °C]
2.0
1.5
- 25 0 25 5 0 7 5
IH
IL
100
Tj(°C)
125
DS2762 - Rev 12 page 4/16
ACST4
Characteristics (curves)
Figure 7. Surge peak on-state current versus number of cycles
35
I
TSM
(A)
30
25
20
15
10
5
0
1
Repetitive
T
C
=102°C
Non repetitive
T j initial=25 °C
10 t=20ms
One cycle
100
Number of cycles
1000
Figure 8. Non repetitive surge peak on-state current for a sinusoidal pulse width
1000
ITSM(A), (A²s) dl/dt limitation: 100 A / µs Tj initial = 25 °C
100
10
1
0.01
0.10
1.00
I
TSM
10.00
Figure 9. On-state characteristics (maximum values)
100
I
TM
(A)
Tjmax:
Vto = 0.90 V
Rd = 110 mΩ
10
1
0
Tj = 125 °C
Tj = 25 °C
1 2 3 4
V
TM
(V)
5
Figure 10. Relative variation of critical rate of decrease of main current (dI/dt)c versus junction temperature
(dI/dt) c [Tj] / (dl/dt) c [Tj = 125 °C]
4
3
2
1
0
25
6
5
8
7
50 75 100
Tj(°C)
125
Figure 11. Relative variation of static dV/dt immunity versus junction temperature (gate open)
6 dV/dt [T j] / dV/dt [T j = 125 °C]
3
2
5
4
1
0
25 50 75
VD = VR = 536 V
100
Tj(°C)
125
Figure 12. Relative variation of Leakage current versus junction temperature
IDRM/IRRM [Tj; VDRM / VRRM] / IDRM/IRRM [Tj = 125 °C; 800 V]
1.0E+00
VDRM = VRRM = 800V
Different bloc king voltages
1.0E-01
VDRM = VRRM = 600 V
1.0E-02
1.0E-03
25 50
VDRM = VRRM = 200 V
75 100
Tj(°C)
125
DS2762 - Rev 12 page 5/16
ACST4
Characteristics (curves)
Figure 13. Relative variation of the clamping voltage versus junction temperature (minimum values)
1.15
1.10
1.05
1.00
0.95
0.90
0.85
-50 -25 0 25 5 0 7 5 100
Tj(°C)
125
Figure 14. Thermal resistance junction to ambient versus copper surface under tab (typical values)
100
R th(j-a)
(°C/W)
90 Epoxy printed circuit board, copper thickness: 35 µm
80
70
60
50
40
30
20
10
0
0 5 10 15 20 25 30
DPAK
S
Cu
(cm²)
35 40
DS2762 - Rev 12 page 6/16
ACST4
Application information
2
Application information
2.1
Typical application descriptions
The ACST4 device has been designed to control medium power load, such as AC motors in home appliances.
Thanks to its thermal and turn off commutation performances, the ACST4 switch is able to drive an inductive load up to 4 A with no turn off additional snubber. It also provides high thermal performances in static and transient modes such as the compressor inrush current or high torque operating conditions of an AC motor. Thanks to its low gate triggering current level, the ACST4 can be driven directly by an MCU through a simple gate resistor as shown
Figure 15 and
Figure 16 .
Figure 15. Compressor control – typical diagrams
Compressor Compressor
AC Mains
PTC
ACST
1
Electronic starter logical circuitry
Power supply
ACST
Electronic thermostat
Rg
Gate
Driver
Compressor with integrated e-starter
AC Mains
Run switch
ACST
PTC
ACST
Start switch
Rg Rg
Power supply
Gate
Driver
Compressor with external electronic drive
DS2762 - Rev 12 page 7/16
ACST4
Typical application descriptions
Figure 16. Universal drum motor control – typical diagram
Universal motor
Stator Rotor
12V
AC Mains
Speed motor regulation
ACST
Motor direction setting
MCU
Rg
Vcc
MCU
DS2762 - Rev 12 page 8/16
2.2
ACST4
AC line transient voltage ruggedness
AC line transient voltage ruggedness
In comparison with standard Triacs, which are not robust against surge voltage, the ACST4 is self-protected against over-voltage, specified by the new parameter V
CL
. The ACST4 switch can safely withstand AC line transient voltages either by clamping the low energy spikes, such as inductive spikes at switch off, or by switching to the on state (for less than 10 ms) to dissipate higher energy shocks through the load. This safety feature works even with high turn-on current ramp up.
The test circuit of represents the ACST4 application, and is used to stress the ACST switch according to the
IEC 61000-4-5 standard conditions. With the additional effect of the load which is limiting the current, the ACST switch withstands the voltage spikes up to 2 kV on top of the peak line voltage. The protection is based on an overvoltage crowbar technology. The ACST4 folds back safely to the on state as shown in . The ACST4 recovers its blocking voltage capability after the surge and the next zero current crossing.
Such a non repetitive test can be done at least 10 times on each AC line voltage polarity.
Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC 61000-4-5 standards
Rg = 220 Ω (ACST410-8), 68 Ω (ACST435-8)
Surge generator
2kV surge
Rgene
Filtering unit
Model of the load
R L
AC Mains
ACST4
Rg
Figure 18. Typical voltage and current waveforms across the ACST4 during IEC 61000-4-5 standard test
Vpeak= VCL
1.2/50 µs voltage surge
V
0
Ipeak = 90 A
I
8/20 µs current surge dI/dt = 130 A/µs
0
DS2762 - Rev 12 page 9/16
3
3.1
ACST4
Package information
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com
. ECOPACK is an ST trademark.
•
•
TO-220FPAB package information
Epoxy meets UL94, V0
Recommended torque: 0.4 to 0.6 N·m
Figure 19. TO-220FPAB package outline
DS2762 - Rev 12 page 10/16
DS2762 - Rev 12
Ref.
G
G1
H
L2
L3
D
E
F
A
B
F1
F2
L4
L5
L6
L7
Dia
ACST4
TO-220FPAB package information
28.60
9.80
2.90
15.90
9.00
3.0
1.15
1.15
4.95
2.40
10.00
Min.
4.40
2.5
2.50
0.45
0.75
Table 5. TO-220FPAB package mechanical data
Dimensions
Millimeters
1.70
1.70
5.20
2.70
10.40
Max.
4.60
2.7
2.75
0.70
1.0
Min.
0.1739
0.0988
0.0988
0.0178
0.0296
0.0455
0.0455
0.1957
0.0949
0.3953
16.00 typ.
Inches
0.6324 typ.
30.60
10.6
3.60
16.40
9.30
3.20
1.1304
0.3874
0.1146
0.6285
0.3557
0.1186
1.2095
0.4190
0.1423
0.6482
0.3676
0.1265
Max.
0.1818
0.1067
0.1087
0.0277
0.0395
0.0672
0.0672
0.2055
0.1067
0.4111
page 11/16
3.2
ACST4
DPAK package information
•
•
DPAK package information
Molding compouned resin is halogen free and meets UL94 flammability standard, level V0
Lead-free package leads plating
Figure 20. DPAK package outline
E b4 c2
E1 e e1 b
A1 c
L
V2
DS2762 - Rev 12 page 12/16
Note:
ACST4
DPAK package information
Table 6. DPAK package mechanical data
Dimensions
Ref.
b4 c c2
D
D1
E
E1
A
A1
A2 b e e1
H
L
L2
L4
V2 (2)
Min.
2.18
0.90
0.03
0.64
4.95
0.46
0.46
5.97
4.95
6.35
4.32
4.40
9.35
1.00
0.60
-8°
Millimeters
Typ.
2.286
1. Dimensions in inches are given for reference only
2. Degree
4.70
10.40
1.78
1.27
1.02
+8°
0.60
6.22
5.60
6.73
5.50
Max.
2.40
1.10
0.23
0.90
5.46
0.61
0.1732
0.3681
0.0394
0.0236
-8°
Min.
0.0858
0.0354
0.0012
0.0252
0.1949
0.0181
0.0181
0.2350
0.1949
0.2500
0.1701
Inches
(1)
Typ.
0.0900
Max.
0.0945
0.0433
0.0091
0.354
0.2150
0.0240
0.0236
0.2449
0.2205
0.2650
0.2165
0.1850
0.4094
0.0701
0.0500
0.0402
+8°
This package drawing may slightly differ from the physical package. However, all the specified dimensions are guaranteed.
Figure 21. DPAK recommended footprint (dimensions are in mm)
12.7
6.7
3.0
3.0
6.7
4.572
A
B
The device must be positioned within 0.05 AB
1.6
DS2762 - Rev 12 page 13/16
4
ACST4
Ordering information
Ordering information
Figure 22. Ordering information scheme
ACS T 4 10 - 8 B T R
AC switch
Topology
T = Triac
On-state RMS current
4 = 4 A
Triggering gate current
10 = 10 mA
35 = 35 mA
Repetitive peak off-state voltage
8 = 800V
Package
B = DPAK
FP = TO-220FPAB
Delivery mode
TR = Tape and reel
Blank = Tube
Order code
ACST410-8B
ACST410-8BTR
ACST410-8FP
ACST435-8B
ACST435-8BTR
ACST435-8FP
Marking
ACST4108
ACST4358
Table 7. Ordering information
Package
DPAK
DPAK
TO-220FPAB
DPAK
DPAK
TO-220FPAB
Weight
1.5 g
2.4 g
1.5 g
2.4 g
Base qty.
50
2500
50
50
2500
50
Packing mode
Tube
Tape and reel
Tube
Tube
Tape and reel
Tube
DS2762 - Rev 12 page 14/16
ACST4
Revision history
Date
Jan-2003
04-Jul-2007
18-Dec-2009
02-Jun-2014
21-Oct-2014
18-May-2017
19-Dec-2019
03-Sep-2020
12-May-2021
03-Aug-2021
Version
3A
4
5
8
9
10
6
7
11
12
Table 8. Document revision history
Changes
Previous update.
Reformatted to current standard. Added package.
V
DRM
/V
RRM
updated to 800 V. Order codes updated.
Updated DPAK package information and reformatted to current standard.
Updated Table 2, Table 3,Table 4, Features and Description.
Updated Features in cover page, Table 2 and Figure 14.
Update DPAK package information.
Updated Table 7. Ordering information
.
Updated Features .
Updated Table 7
.
DS2762 - Rev 12 page 15/16
ACST4
IMPORTANT NOTICE – PLEASE READ CAREFULLY
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of
Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. For additional information about ST trademarks, please refer to www.st.com/trademarks . All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2021 STMicroelectronics – All rights reserved
DS2762 - Rev 12 page 16/16
