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ACST4
Overvoltage protected AC switch
Features

Triac with overvoltage protection Low IGT (<10 mA) or high immunity (IGT<35 mA) version High noise immunity: static dV/dt > 1000 V/s TO-220FPAB insulated package: 1500 V rms
OUT
G COM
G OUT COM
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
DPAK ACST410-8B ACST435-8B
TO-220FPAB ACST410-8FP ACST435-8FP
Figure 1.
Functional diagram
OUT
Applications

AC mains static switching in appliance and industrial control systems Drive of medium power AC loads such as: - Universal motor of washing machine drum - Compressor for fridge or air conditioner Table 1.
Symbol IT(RMS) VDRM/VRRM
G COM
Device summary
Value 4 800 10 35 Unit A V mA mA
Description
The ACST4 series belongs to the ACSTM/ACST power switch family built with A.S.D.(R) (application specific discrete) technology. 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 and a high voltage clamping device able 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 only a low gate current to be activated (IGT < 10 mA) and still shows a high noise immunity complying with IEC standards such as IEC 61000-4-4 (fast transient burst test).
IGT (ACST410) IGT (ACST435)
TM: ACS is a trademark of STMicroelectronics. (R): A.S.D. is a registered trademark of STMicroelectronics
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Characteristics
ASCT4
1
Table 2.
Symbol
Characteristics
Absolute ratings (limiting values)
Parameter TO-220FPAB IT(RMS) On-state rms current (full sine wave) DPAK Tc = 102 C Tc = 112 C 1 32 30 6 100 2 0.1 10 1.6 -40 to +150 -40 to +125 260 1500 A A A2s A/s kV W W A C C C V Value 4 A Unit
DPAK with Tamb = 60 C 0.5 cm2 copper ITSM I2t dI/dt VPP PG(AV) PGM IGM Tstg Tj Tl Non repetitive surge peak on-state current F = 60 Hz Tj initial = 25 C, ( full cycle sine wave) F = 50 Hz I2t for fuse selection F = 120 Hz tp = 16.7 ms tp = 20 ms tp = 10 ms Tj = 125 C Tj = 25 C Tj = 125 C Tj = 125 C Tj = 125 C
Critical rate of rise on-state current IG = 2 x IGT, (tr 100 ns) Non repetitive line peak pulse voltage (1) Average gate power dissipation Peak gate power dissipation (tp = 20 s) Peak gate current (tp = 20 s) Storage temperature range Operating junction temperature range
Maximum lead solder temperature during 10 ms (at 3 mm from plastic case) TO-220FPAB
VINS(RMS) Insulation rms voltage
1. According to test described in IEC 61000-4-5 standard and Figure 19.
Table 3.
Symbol IGT(1) VGT VGD IH(2) IL dV/dt
(2)
Electrical characteristics
Test conditions VOUT = 12 V, RL = 33 VOUT = 12 V, RL = 33 VOUT = VDRM, RL = 3.3 k IOUT = 500 mA IG = 1.2 x IGT VOUT = 67 % VDRM, gate open I - II - III Quadrant I - II - III I - II - III I - II - III Tj 25 C 25 C 125 C 25 C 25 C 125 C 125 C 125 C 25 C MIN. MAX. MAX. MIN. MAX. MAX. MIN. MIN. 2 850 20 40 500 ACST410 ACST435 10 1.0 0.2 25 60 1000 5 35 1.1 Unit mA V V mA mA V/s A/ms A/ms V
(dI/dt)c(2) Without snubber (dI/dt)c VCL
(2)
(dV/dt)c = 15 V/s ICL = 0.1 mA, tp = 1 ms
1. Minimum IGT is guaranteed at 5% of IGT max 2. For both polarities of OUT pin referenced to COM pin
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ASCT4 Table 4.
Symbol VTM(1) VT0(1) Rd(1) IDRM IRRM IOUT = 5.6 A, tp = 500 s Threshold voltage Dynamic resistance VOUT = VDRM/ VRRM
Characteristics Static characteristics
Test conditions Tj = 25 C Tj = 125 C Tj = 125 C Tj = 25 C Tj = 125 C MAX. MAX. MAX. MAX. MAX. Value 1.7 0.9 110 20 500 Unit V V m A A
1. For both polarities of OUT pin referenced to COM pin
Table 5.
Symbol
Thermal resistances
Parameter Junction to ambient TO-220FPAB
2
Value 60
Unit C/W
Rth(j-a)
Junction to ambient (soldered on 0.5 cm copper pad) Junction to case for full cycle sine wave conduction
DPAK TO-220FPAB
70 4.6 C/W 2.6
Rth(j-c)
DPAK
Figure 2.
Maximum power dissipation versus Figure 3. on-state rms current
5
On-state rms current versus case temperature (full cycle)
6 5
P(W)
= 180
180
IT(RMS)(A)
=180
4
DPAK TO220FPAB
4
3
3
2
2 1
IT(RMS)(A)
1
TC (C)
0 0 25 50 75 100 125
0 0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
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Characteristics
ASCT4
Figure 4.
On-state rms current versus ambient temperature (free air convection, full cycle)
Figure 5.
Relative variation of thermal impedance versus pulse duration
2.0
IT(RMS)(A)
=180
TO-220FPAB
1.0E+00
K = [Zth / Rth]
Zth(j-c)
DPAK
Zth(j-a)
1.5
DPAK with copper surface = 0.5 cm2
1.0
1.0E-01
TO-220FPAB
0.5
Ta(C)
0.0 0 25 50 75 100 125
1.0E-02 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01
Tp(s)
1.0E+02 1.0E+03
Figure 6.
Relative variation of gate trigger current (IGT) and voltage (VGT) versus junction temperature
Figure 7.
Relative variation of holding current (IH) and latching current (IL) versus junction temperature
3.0 2.5 2.0 1.5
IGT, VGT[Tj] / IGT, VGT[Tj = 25 C]
(typical values) IGT Q3 IGT Q1-Q2
2.5
IH, IL[Tj] / IH, IL[Tj = 25 C]
(typical values)
2.0
1.5
1.0
1.0 0.5
VGT Q1-Q2-Q3 0.5
IL IH Tj(C)
-50 -25 0 25 50 75 100 125
Tj(C)
0.0 -50
0.0
-25
0
25
50
75
100
125
Figure 8.
Surge peak on-state current versus number of cycles
Figure 9.
Non repetitive surge peak on-state current and corresponding value of I2t versus sinusoidal pulse width
35 30
ITSM(A)
1000
ITSM(A), It (As)
dl /dt limitation: 100 A / s Tj initial = 25 C
t=20ms
25 20 15
Non repetitive Tj initial=25 C
One cycle
100
ITSM
10
10 5 0 1 10 100 1000
Repetitive TC=102C
It
Number of cycles
1 0.01
tp (ms)
0.10 1.00 10.00
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Characteristics
Figure 10. On-state characteristics (maximum values)
ITM(A)
Tjmax: Vto = 0.90 V Rd = 110 m
Figure 11. 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]
8 7 6 5
100
10
4 3 2 Tj = 125 C Tj = 25 C 1 VTM(V) 0
Tj(C)
25 50 75 100 125
1 0 1 2 3 4
5
Figure 12. Relative variation of static dV/dt immunity versus junction temperature (gate open)
6 5
Figure 13. 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
dV/dt [Tj] / dV/dt [Tj = 125 C]
VD = VR = 536 V
Different blocking voltages
4 3 2 1 0 25 50 75 100 1.0E-02
VDRM = VRRM = 200 V
1.0E-01
VDRM = VRRM = 600 V
Tj(C)
125
1.0E-03 25
Tj(C)
50 75 100 125
Figure 14. Relative variation of the clamping voltage (VCL) versus junction temperature (minimum values)
1.15 1.10 1.05 1.00 0.95
Figure 15. Thermal resistance junction to ambient versus copper surface under tab
100 90 80 70 60 50 40 30
VCL[Tj] / VCL [Tj = 25 C]
Rth(j-a)(C/W)
Printed circuit board FR4, copper thickness = 35 m
DPAK
0.90 0.85 -50
20
Tj(C)
-25 0 25 50 75 100 125
10 0 0 5 10 15
SCU(cm)
20 25 30 35 40
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Application information
ASCT4
2
2.1
Application information
Typical application description
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 16 and Figure 17. Figure 16. Compressor control - typical diagrams
Compressor
Compressor
AC Mains PTC
AC Mains PTC ACST
ACST 2 1 3
Electronic starter
logical circuitry
Start switch Run switch
ACST
ACST
Electronic thermostat
Rg
Gate Driver
Rg Power supply
Gate Driver
Rg
Power supply
Compressor with integrated e-starter
Compressor with external electronic drive
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ASCT4 Figure 17. Universal drum motor control - typical diagram
Universal motor
Application information
Stator
Rotor
12V AC Mains
Motor direction setting
MCU
Speed motor regulation
ACST
Rg
Vcc MCU
2.2
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 VCL. 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 Figure 18 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 Figure 19. 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.
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Application information
ASCT4
Figure 18. Overvoltage ruggedness test circuit for resistive and inductive loads for IEC 61000-4-5 standards
R = 23 , L = 2 H, Vsurge = 2 kV Rg = 220 (ACST410-8), 68 (ACST435-8) Surge generator
2kV surge
Rgene
Filtering unit
Model of the load
R
L ACST4
AC Mains Rg
Figure 19. Typical current and voltage waveforms across the ACST4 during IEC 61000-4-5 standard test
Vpeak = VCL 1.2/50 s voltage surge
V 0
Ipeak = 90 A I
8/20 s current surge 0 dI/dt = 130 A/s
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ASCT4
Ordering information scheme
3
Ordering information scheme
Figure 20. Ordering information scheme
ACS T 4 10 - 8
B TR
AC switch Topology T = Triac On-state rms current 4=4A 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
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Package information
ASCT4
4
Package information

Epoxy meets UL94, V0 Cooling method: by conduction (C) Recommended torque value(TO220FPAB): 0.4 to 0.6 N*m
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) is an ST trademark. Table 6. TO-220FPAB dimensions
Dimensions Ref. Millimeters Min. A B
A H B
Inches Min. 0.173 0.098 0.098 0.018 0.030 0.045 0.045 0.195 0.094 0.393 Max. 0.181 0.106 0.108 0.027 0.039 0.067 0.059 0.205 0.106 0.409
Max. 4.6 2.7 2.75 0.70 1 1.70 1.50 5.20 2.7 10.4
4.4 2.5 2.5 0.45 0.75 1.15 1.15 4.95 2.4 10
D E
Dia L6 L2 L3 L5 F1 L4 F2 D L7
F F1 F2 G G1 H L2
E
16 Typ. 28.6 9.8 2.9 15.9 9.00 3.00 30.6 10.6 3.6 16.4 9.30 3.20
0.63 Typ. 1.126 0.386 0.114 0.626 0.354 0.118 1.205 0.417 0.142 0.646 0.366 0.126
F G1 G
L3 L4 L5 L6 L7 Dia.
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ASCT4 Table 7. DPAK dimensions
Package information
Dimensions Ref. Millimeters Min. A
E B2 L2 C2 A
Inches Min. 0.086 0.035 0.001 0.025 0.204 0.017 0.018 0.236 0.251 0.173 0.368 Max. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.259 0.181 0.397
Max. 2.40 1.10 0.23 0.90 5.40 0.60 0.60 6.20 6.60 4.60 10.10
2.20 0.90 0.03 0.64 5.20 0.45 0.48 6.00 6.40 4.40 9.35
A1 A2 B B2
D
H L4 B G A1
R
C C2
R C
D E
A2 0.60 MIN.
G H
V2
L2 L4 V2
0.80 typ. 0.60 0 1.00 8
0.031 typ. 0.023 0 0.039 8
Figure 21. Footprint (dimensions in mm)
6.7 3 3 1.6
2.3 6.7 2.3
1.6
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Ordering information
ASCT4
5
Ordering information
Table 8. Ordering information
Marking Package DPAK ACST4108 DPAK TO-220FPAB DPAK ACST4358 DPAK TO-220FPAB Weight 1.5 g 1.5 g 2.4 g 1.5 g 1.5 g 2.4 g Base Qty 50 1000 50 50 1000 50 Delivery mode Tube Tape and reel Tube Tube Tape and reel Tube
Order code ACST410-8B ACST410-8BTR ACST410-8FP ACST435-8B ACST435-8BTR ACST435-8FP
6
Revision history
Table 9.
Date Jan-2003 04-Jul-2007 18-Dec-2009
Document revision history
Revision 3A 4 5 Previous update. Reformatted to current standard. Added package. VDRM/VRRM updated to 800 V. Order codes updated. Changes
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ASCT4
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