ACST8
Datasheet
8 A - 800 V overvoltage protected AC switch
OUT
TO-220AB
G
OUT
COM
TO-220FPAB
COM
OUT
G
OUT
D²PAK
COM
G
OUT
G
COM
Product status link
ACST8
Product summary
I
T(RMS)
V
DRM
/V
RRM
I
GT
8 A
800 V
30 mA
Features
• Triac with overvoltage protection
• High noise immunity: static dV/dt > 2000 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 ACST8 series belongs to the ACS/ACST power switch family built around A.S.D.
(application specific discrete) technology. This high performance device is suited to home appliances or industrial systems and drives an induction motor up to 8 A.
This ACST8 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.
ACST8 shows a high noise immunity complying with IEC standards such as IEC
61000-4-4 (fast transient burst test).
DS2106 - Rev 11 - September 2021
For further information contact your local STMicroelectronics sales office.
www.st.com
1
ACST8
Characteristics
Characteristics
Table 1. Absolute ratings (limiting values)
Symbol
I
T(RMS)
On-state rms current (full sine wave)
Parameter
TO-220FPAB
TO-220AB, D²PAK
T c
= 91 °C
T c
= 105 °C
D²PAK with 1 cm² copper T amb
= 43 °C f = 50 Hz t p
= 20 ms
I
TSM
I 2 t dI/dt
Non repetitive surge peak onstate current
T j
initial = 25 °C, (full cycle sine wave)
I 2 t for fuse selection
Critical rate of rise on-state current
I
G
= 2 x I
GT
, tr ≤ 100 ns f = 60 Hz f = 120 Hz t t
T p p j
= 16.7 ms
= 10 ms
= 125 °C
V
PP
(1)
P
G(AV)
P
GM
I
GM
T stg
T j
T
L
V ins
Non repetitive line peak pulse voltage
Average gate power dissipation
Peak gate power dissipation (t p
Peak gate current (t p
= 20 ms)
Storage temperature range
= 20 ms)
Operating junction temperature range
Lead temperature for soldering during 10 s (at 3 mm from plastic case)
Insulation rms voltage (60 seconds) for TO-220FPAB
T j
= 25 °C
T j
= 125 °C
T j
= 125 °C
T j
= 125 °C
1. according to test described by standard IEC 61000-4-5 standard and
Figure 17
Table 2. Electrical characteristics per switch
Symbol Test conditions
I
GT
(1)
V
GT
V
GD
I
H
(2)
I
L
dV/dt (2)
(dI/dt)c
V
CL
(2)
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 j
= 125 °C
I
CL
= 0.1 mA, t p
= 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
100
2
0.1
10
1.6
-40 to +150
-40 to +125
260
2000
Value
8
2
80
84
42
Unit
A
A
A 2 s
A/μs kV
W
W
A
°C
°C
°C
V
Max.
Value Unit
30
Max.
1.0
mA
V
Min.
Max.
0.2
30
V mA
Max.
50 mA
Min.
2000 V/µs
Min.
8
Min.
850
A/ms
V
DS2106 - Rev 11 page 2/17
ACST8
Characteristics
Table 3. Static characteristics
Symbol
V
TM
(1)
V
T0
(1)
R
D
(1)
I
DRM
I
RRM
I
OUT
= 11.3 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
Value Unit
Max.
1.5
V
V Max.
0.9
Max.
Max.
50
20
1 mΩ
µA mA
Symbol
R th(j-a)
R th(j-c)
Table 4. Thermal characteristics
Parameter
Junction to ambient
Junction to ambient (soldered on 1cm² copper pad)
Junction to case (AC)
TO-220FPAB, TO-220AB
D²PAK
TO-220FPAB
TO-220AB, D²PAK
Value Unit
60
45
3.6
2
°C/W
DS2106 - Rev 11 page 3/17
ACST8
Characteristics (curves)
1.1
Characteristics (curves)
Figure 1. Maximum power dissipation versus RMS onstate current
P(W)
10
9
8
7
6
5
4
3
2
1
0
0
α = 180°
1 2 3 4
180°
5 6
IT(RMS)(A)
7 8
Figure 2. On-state RMS current versus case temperature
(full cycle)
I
T(RMS)
(A)
5
4
3
2
1
0
0
9
8
7
6
α =180°
25 50
TO 220FPAB
75
T
C
(°C)
100
TO-220AB
D²PAK
125
Figure 3. On-state RMS current versus ambient temperature (free air convection, full cycle)
3.0
I T(RMS) (A)
1.0
0.5
0.0
0
2.5
2.0
1.5
TO-220
25
D 2 PAK
Copper surface
= 1cm 2
50
T amb
(°C)
75 100
α=180°
125
Figure 4. Relative variation of thermal impedance versus pulse duration
1.0E+00
K=[Z th
/R th
]
TO-220AB Z th(j-c)
Z th(j-a)
TO-220FPAB
1.0E-01
TO-220AB
1.0E-02
1.0E-03 1.0E-02
TO-220FPAB
1.0E-01 1.0E+00 1.0E+01 t p
(s)
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
I
GT
, V
GT
[T j
] / I
GT
, V
GT
[T j
=25 °C]
I
GT
Q3
2.5
I
GT
Q1-Q2
2.0
1.5
1.0
V
GT
Q1-Q2-Q3
0.5
0.0
-50 -25 0 25
T j
(°C)
50
Typical values
75 100 125
1.5
1.0
0.5
0.0
-50
Figure 6. Relative variation of holding current and latching current versus junction temperature
(typical values)
2.5
I
H
, I
L
[T j
] / I
H
, I
L
[T j
=25 °C]
2.0
-25 0 25
T j
(°C)
50 75
I
H
I
L
100 125
DS2106 - Rev 11 page 4/17
ACST8
Characteristics (curves)
Figure 7. Surge peak on-state current versus number of cycles
Figure 8. Non repetitive surge peak on-state current for a sinusoidal pulse width
TO-220AB and D²PAK
Number of cycles
Figure 9. On-state characteristics (maximum values)
100
I
TM
(A)
10
1
0
T j
=125 °C
1
T j
=25 °C
2
V
TM
(V)
3 4
V to
T j
R d max :
= 0.90 V
= 50 mΩ
5
Figure 10. Relative variation of critical rate of decrease of main current (dI/dt)c versus junction temperature
15
14
(dI/dt)c[T j
] / (dI/dt)c[T
13
12
11
10
9
8
7
6
5
4
3
2
1
0 j
=125°C]
T j
(°C)
25 50 75 100 125
Figure 11. Relative variation of static dV/dt immunity versus junction temperature (gate open)
Figure 12. Relative variation of leakage current versus junction temperature
1.0E+00
I
DRM
/I
RRM
[Tj;V
DRM /
V
RRM
]/I
DRM
/I
RRM
[Tj = 125°C; 800V]
R M
= 8 0 0
Different blocking voltages
1.0E-01 V
DRM
=V
RRM
=600 V
1.0E-02
1.0E-03
25 50 75
V
DRM
=V
RRM
=200 V
T j
(°C)
100 125
DS2106 - Rev 11 page 5/17
ACST8
Characteristics (curves)
Figure 13. Relative variation of the clamping voltage versus junction temperature (minimum values)
1.15
V
CL
[Tj /V
CL
[Tj = 25°C ]
1.10
1.05
1.00
0.95
0.90
0.85
-50 -25 0 25
T j
(°C)
50 75 100 125
Figure 14. Thermal resistance junction to ambient versus copper surface under tab (typical values)
40
30
20
10
0
0
80
R th(j-a)
(°C/W)
70
60
50
5
D²PAK
Epoxy printed board FR4, copper thickness = 35 µm
10 15 20 25 30
S
Cu
(cm²)
35 40
DS2106 - Rev 11 page 6/17
ACST8
Application information
2
Application information
2.1
Typical application descriptions
The ACST8 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 ACST8 switch is able to drive an inductive load up to 8 A with no turn off additional snubber. It also provides high thermal performances in static and transient modes such as high torque operating conditions or inrush current of an AC motor.
Figure 15. AC induction motor control – typical diagram
AC Motor
AC induction motor
AC Mains
C L
Phase shift capacitor + protective air inductance
ACST ACST
Rg Rg Selection of the rotor direction
Vcc
MCU
DS2106 - Rev 11 page 7/17
2.2
ACST8
AC line transient voltage ruggedness
AC line transient voltage ruggedness
In comparison with standard Triacs, which are not robust against surge voltage, the ACST8 is self-protected against over-voltage, specified by the new parameter V
CL
. The ACST8 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 Figure 17
represents the ACST8 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 ACST8 folds back safely to the on state as shown in
Figure 18 . 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 16. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC 61000-4-5 standards
Filtering unit
R = 13 Ω, L = 2 µH, Vsurge = 2 kV
Rg = 82 Ω
Surge generator
2kV surge
Rgene
Model of the load
R L
ACST8
AC Mains
Rg
Figure 17. Typical voltage and current waveforms across the ACST8 during IEC 61000-4-5 standard test
Vpeak= VCL
1.2/50 µs voltage surge
V
0
Ipeak = 160 A
I
8/20 µs current surge dI/dt = 180 A/µs
0
DS2106 - Rev 11 page 8/17
3
3.1
ACST8
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-220AB package information
Molding compouned resin is halogen free and meets UL94 flammability standard, level V0
Lead-free package leads plating
Cooling method: by conduction (C)
Recommended torque value: 0.55 N·m
Maximum torque value: 0.70 N·m
Figure 18. TO-220AB package outline
DS2106 - Rev 11 page 9/17
DS2106 - Rev 11
Ref.
e e1
F
H1
J1 b1 c
D
D1
E
A b
L
L1
L20
L30
θP
Q
ACST8
TO-220AB package information
Table 5. TO-220AB package mechanical data
Dimensions
10.00
2.40
4.95
1.23
6.20
2.40
13.00
3.50
Min.
4.40
0.61
1.14
0.48
15.25
3.75
2.65
Millimeters
1.27 typ.
16.40 typ.
28.90 typ.
10.40
2.70
5.15
1.32
6.60
2.72
14.00
3.93
Max.
4.60
0.88
1.55
0.70
15.75
3.85
2.95
0.3937
0.0945
0.1949
0.0484
0.2441
0.0945
0.5118
0.1378
Inches (for reference only)
Min.
0.1732
0.0240
0.0449
0.0189
0.6004
Max.
0.1811
0.0346
0.0610
0.0276
0.6201
0.0500 typ.
0.4094
0.1063
0.2028
0.0520
0.2598
0.1071
0.5512
0.1547
0.6457 typ.
1.1378 typ.
0.1476
0.1043
0.1516
0.1161
page 10/17
3.2
•
•
TO-220FPAB package information
Epoxy meets UL94, V0
Recommended torque: 0.4 to 0.6 N·m
Figure 19. TO-220FPAB package outline
ACST8
TO-220FPAB package information
DS2106 - Rev 11 page 11/17
DS2106 - Rev 11
Ref.
G
G1
H
L2
L3
D
E
F
A
B
F1
F2
L4
L5
L6
L7
Dia
ACST8
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 6. 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 12/17
3.3
•
•
D²PAK package information
Epoxy meets UL94, V0.
Cooling method: by conduction (C)
Figure 20. D²PAK package outline
ACST8
D²PAK package information
Note: This package drawing may slightly differ from the physical package. However, all the specified dimensions are guaranteed.
DS2106 - Rev 11 page 13/17
DS2106 - Rev 11
ACST8
D²PAK package information e e1
H
J1
L
L1
L2
R
V2
D1
D2
E
E1
E2
A
A1 b b2 c c2
D
Ref.
Table 7. D²PAK package mechanical data
4.88
15.00
2.49
2.29
1.27
1.30
1.23
8.95
7.50
1.10
10.00
8.30
6.85
Min.
4.40
0.03
0.70
1.14
0.45
0°
Millimeters
Typ.
7.75
1.30
8.50
7.05
2.54
0.40
5.28
15.85
2.69
2.79
1.40
1.75
1.36
9.35
8.00
1.50
10.40
8.70
7.25
Max.
4.60
0.23
0.93
1.70
0.60
Dimensions
0.190
0.591
0.097
0.090
0.049
0.050
0.048
0.352
0.295
0.043
0.394
0.335
0.266
Min.
0.173
0.001
0.028
0.045
0.018
Inches (for reference only)
Typ.
0.305
0.051
0.343
0.278
0.100
0.053
0.368
0.315
0.060
0.409
0.346
0.282
Max.
0.181
0.009
0.037
0.067
0.024
0.205
0.624
0.106
0.110
0.055
0.069
0.015
8° 0° 8°
Figure 21. D²PAK recommended footprint (dimensions are in mm)
12.2
9.75
16.9
3.5
1.6
2.54
5.08
page 14/17
4
ACST8
Ordering information
Ordering information
Figure 22. Ordering information scheme
ACS T 8 30 - 8 G TR
AC switch
Topology
T = Triac
On-state RMS current
8 = 8 A
Triggering gate current
30 = 30 mA
Repetitive peak off-state voltage
8 = 800V
Package
FP = TO-220FPAB
T = TO-220AB
G = D²PAK
Delivery mode
TR = Tape and reel
Blank = Tube
Order code
ACST830-8FP
ACST830-8T
ACST830-8GTR
Marking
ACST8308
Table 8. Ordering information
Package
TO-220FPAB
TO-220AB
D²PAK
Weight
2.4 g
2.3 g
1.5 g
Base qty.
50
50
1000
Packing mode
Tube
Tube
Tape and reel
DS2106 - Rev 11 page 15/17
Revision history
Date
Jan-2002
08-Nov-2004
24-Nov-2004
18-Dec-2009
01-Jul-2010
07-Feb-2011
04-Sep-2017
29-Sep-2021
7
8
9
10
11
Table 9. Document revision history
Revision
4B
5
6
Changes
Last update.
TO-220AB and D²PAK packages added.
Table 6 page 3: I
GT
parameter added.
Added ECOPACK statement. Reformatted for consistency with other datasheets in this product class. Order codes updated.
Updated Figure 19.
Updated Table 2.
Updated features in cover page and Table 2.
Updated Section 4: Package information.
Minor text changes.
Updated D²PAK package information.
ACST8
DS2106 - Rev 11 page 16/17
ACST8
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DS2106 - Rev 11 page 17/17
