July 2010 Doc ID 7297 Rev 10 1/15
15
ACST6
Overvoltage protected AC switch
Features
■Triac with overvoltage protection
■Low IGT (< 10 mA)
■TO-220FPAB insulated package: 1500 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 motor of washing machine drum
– Compressor for fridge or air conditioner
Description
The ACST6 series belongs to the ACS™/ACST
power switch family built with A.S.D.® (application
specific discrete) technology. This high
performance device is suited to home appliances
or industrial systems, and drives loads up to 6 A.
This ACST6 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 ACST610 needs
only 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).
Figure 1. Functional diagram
TM: ACS is a trademark of STMicroelectronics.
®: A.S.D. is a registered trademark of
STMicroelectronics
Table 1. Device summary
Symbol Value Unit
IT(RMS) 6A
VDRM/VRRM 800 V
IGT 10 mA
TO-220AB
ACST610-8T
TO-220FPAB
ACST610-8FP
D²PAK
ACST610-8G
I²PAK
ACST610-8R
G
OUT
OUT
COM
G
OUT
COM
G
OUT
COM
G
OUT
OUT
COM
G
COM
OUT
www.st.com
Characteristics ACST6
2/15 Doc ID 7297 Rev 10
1 Characteristics
Table 2. Absolute ratings (limiting values)
Symbol Parameter Value Unit
IT(RMS) On-state rms current (full sine wave)
TO-220FPAB Tc = 92 °C
6
A
TO-220AB/
D2PAK / I2PA K Tc = 106 °C
D2PAK wi t h
1cm
2 copper Tamb = 62 °C 1.5
ITSM
Non repetitive surge peak on-state current Tj
initial = 25 °C, ( full cycle sine wave)
F = 60 Hz tp = 16.7 ms 47 A
F = 50 Hz tp = 20 ms 45 A
I2tI
2t for fuse selection tp = 10 ms 13 A2s
dI/dt Critical rate of rise on-state current
IG = 2 x IGT, (tr ≤ 100 ns) F = 120 Hz Tj = 125 °C 100 A/µs
VPP Non repetitive line peak pulse voltage (1) Tj = 25 °C 2 kV
PG(AV) Average gate power dissipation Tj = 125 °C 0.1 W
PGM Peak gate power dissipation (tp = 20 µs) Tj = 125 °C 10 W
IGM Peak gate current (tp = 20 µs) Tj = 125 °C 1.6 A
Tstg Storage temperature range -40 to +150 °C
Tj Operating junction temperature range -40 to +125 °C
Tl Maximum lead solder temperature during 10 ms (at 3 mm from plastic case) 260 °C
VINS(RMS) Insulation rms voltage TO-220FPAB 1500 V
1. According to test described in IEC 61000-4-5 standard and Figure 19.
Table 3. Electrical characteristics
Symbol Test conditions Quadrant TjValue Unit
IGT(1) VOUT = 12 V, RL = 33 ΩI - II - III 25 °C MAX. 10 mA
VGT VOUT = 12 V, RL = 33 ΩI - II - III 25 °C MAX. 1.0 V
VGD VOUT = VDRM, RL = 3.3 kΩI - II - III 125 °C MIN. 0.2 V
IH(2) IOUT = 500 mA 25 °C MAX. 25 mA
ILIG = 1.2 x IGT I - III 25 °C MAX. 30 mA
ILIG = 1.2 x IGT II 25 °C MAX. 40 mA
dV/dt(2) VOUT = 67 % VDRM, gate open 125 °C MIN. 500 V/µs
(dI/dt)c(2) (dV/dt)c = 15 V/µs 125 °C MIN. 3.5 A/ms
VCL ICL = 0.1 mA, tp = 1 ms 25 °C MIN. 850 V
1. Minimum IGT is guaranteed at 5% of IGT max
2. For both polarities of OUT pin referenced to COM pin
ACST6 Characteristics
Doc ID 7297 Rev 10 3/15
Table 4. Static characteristics
Symbol Test conditions Value Unit
VTM(1)
1. For both polarities of OUT pin referenced to COM pin
IOUT = 2.1 A, tp = 500 µs Tj = 25 °C MAX. 1.4 V
IOUT = 8.5 A, tp = 500 µs 1.7
VT0(1) Threshold voltage Tj = 125 °C MAX. 0.9 V
Rd(1) Dynamic resistance Tj = 125 °C MAX. 80 mΩ
IDRM
IRRM VOUT = VDRM/ VRRM
Tj = 25 °C MAX. 20 µA
Tj = 125 °C MAX. 500 µA
Table 5. Thermal resistances
Symbol Parameter Value Unit
Rth(j-a)
Junction to ambient
TO-220AB
TO-220FPAB 60
°C/W
I2PAK 65
Junction to ambient (soldered on 1 cm2 copper pad) D2PA K 4 5
Rth(j-c) Junction to case for full cycle sine wave conduction
TO-220FPAB 4.25
°C/W
TO-220AB
D2PAK , I2PA K 2.5
Figure 2. Maximum power dissipation versus
rms on-state current
Figure 3. On-state rms current versus case
temperature (full cycle)
0
1
2
3
4
5
6
7
8
0123456
P(W)
α= 180°
IT(RMS)(A)
180°
0
1
2
3
4
5
6
7
0 25 50 75 100 125
IT(RMS)(A)
TC(°C)
TO-220FPAB
TO-220AB
D²PAK
I²PAK
α= 180°
Characteristics ACST6
4/15 Doc ID 7297 Rev 10
Figure 4. On-state rms current versus
ambient temperature
(free air convection, full cycle)
Figure 5. Relative variation of thermal
impedance versus pulse duration
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
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
IT(RMS)(A)
Ta(°C)
0.0
0.5
1.0
1.5
2.0
2.5
0 25 50 75 100 125
α=180°
D
2
PAK with
copper
surface = 1
cm
2
TO-220FPAB
TO220AB
I
2
PA K
K = [Zth / Rth]
1.0E-02
1.0E-01
1.0E+00
tp(s)
1.0E-03 1.0E-01 1.0E+01 1.0E+03
Zth(j-c)
Zth(j-a)
TO-220AB
D²PAK
I²PAK
TO-220FPAB
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-50 -25 0 25 50 75 100 125
IGT,V
GT[Tj] / IGT,V
GT[Tj= 25 °C]
Tj(°C)
IGT Q3
IGT Q1-Q2
V Q1-Q2-Q3
GT
(typical values)
0.0
0.5
1.0
1.5
2.0
2.5
-50 -25 0 25 50 75 100 125
IH,I
L[Tj] / IH,I
L[Tj= 25 °C]
Tj(°C)
IL
IH
(typical values)
ITSM(A)
Number of cycles
0
10
20
30
40
50
1 10 100 1000
Number of cycles
Repetitive
T
C=106 °C
Non repetitive
Tjinitial = 25 °C
One cycle
t = 20 ms
1
10
100
1000
0.01 0.10 1.00 10.00
dl /dt limitation: 100 A / µs Tjinitial = 25 °C
ITSM
I²t
ITSM(A), I²t (A²s)
tp(ms)
ACST6 Characteristics
Doc ID 7297 Rev 10 5/15
Figure 10. On-state characteristics
(maximum values)
Figure 11. Relative variation of critical rate of
decrease of main current (dI/dt)c
versus junction temperature
1
10
100
012345
ITM(A)
VTM(V)
Tjmax:
Vto = 0.90 V
Rd= 80 mΩ
Tj= 125 °C Tj= 25 °C
0
1
2
3
4
5
6
7
8
25 50 75 100 125
(dl/dt)c[Tj] / (dl/dt)c[Tj= 125 °C]
Tj(°C)
Figure 12. Relative variation of static dV/dt
immunity versus junction
temperature (gate open)
Figure 13. Relative variation of leakage
current versus junction
temperature
0
1
2
3
4
5
6
25 50 75 100 125
dV/dt [Tj] / dV/dt [Tj= 125 °C]
Tj(°C)
VD=V
R= 536 V
25 50 75 100 125
IDRM/IRRM [Tj;V
DRM /V
RRM] / IDRM/IRRM[Tj= 125 °C; 800 V]
1.0E-03
1.0E-02
1.0E-01
1.0E+00
Tj(°C)
VDRM =V
RRM = 200 V
VDRM =V
RRM = 600 V
VDRM =V
RRM = 800V
Different blocking voltages
Figure 14. Relative variation of clamping
voltage (VCL) versus junction
temperature (minimum values)
Figure 15. Thermal resistance junction to
ambient versus copper surface
under tab
V[T
j] / V [Tj= 25 °C]
CL CL
0.85
0.90
0.95
1.00
1.05
1.10
1.15
-50 -25 0 25 50 75 100 125
Tj(°C)
0
10
20
30
40
50
60
70
80
0 5 10 15 20 25 30 35 40
D²PAK
SCU
(cm²)
Printed circuit board FR4,
copper thickness = 35 µm
Rth(j-a)(°C/W)
Application information ACST6
6/15 Doc ID 7297 Rev 10
2 Application information
2.1 Typical application description
The ACST6 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 ACST6
switch is able to drive an inductive load up to 6 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 ACST6 can be driven directly by an MCU through a simple gate
resistor as shown Figure 16 and Figure 17.
Figure 16. Compressor control – typical diagram
Compressor
Electronic
starter
Electronic
thermostat
ACST
Rg
ACST
Power supply
AC Mains
Gate
Driver
logical circuitry
1
2
3
PTC
Compressor with integrated e-starter
Compressor
Start
switch
Run
switch
PTC
Rg
ACST
Power supply
Gate
Driver
ACST
Rg
AC Mains
Compressor with external electronic drive
ACST6 Application information
Doc ID 7297 Rev 10 7/15
Figure 17. Universal drum motor control – typical diagram
2.2 AC line transient voltage ruggedness
In comparison with standard Triacs, which are not robust against surge voltage, the ACST6
is self-protected against over-voltage, specified by the new parameter VCL. The ACST6
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 ACST6 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 ACST6 folds back safely to the on state as shown in Figure 19. The ACST6
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.
Universal motor
Motor direction
setting
Speed motor
regulation
Rg
AC Mains
Stator
MCU
Vcc
12V
ACST
Rotor
MCU
Application information ACST6
8/15 Doc ID 7297 Rev 10
Figure 18. Overvoltage ruggedness test circuit for resistive and inductive loads for
IEC 61000-4-5 standards
Figure 19. Typical current and voltage waveforms across the ACST6 during
IEC 61000-4-5 standard test
AC Mains
R
Filtering unit
Rg
Model of the load
Rgene
Surge generator
ACST6
2kV surge
L
R = 18 , L = 2 µH, Vsurge = 2 kV
Rg = 220
Ω
Ω
I
V
0
0
Vpeak =V
CL
1.2/50 µs voltage surge
8/20 µs current surge
Ipeak = 120 A
dI/dt = 150 A/µs
ACST6 Ordering information scheme
Doc ID 7297 Rev 10 9/15
3 Ordering information scheme
Figure 20. Ordering information scheme
ACS T 6 10 - 8 G TR
AC switch
Topology
On-state rms current
Repetitive peak off-state voltage
Package
T = Triac
6 = 6 A
8 = 800 V
FP = TO-220FPAB
T = TO-220AB
Triggering gate current
Delivery mode
10 = 10 mA
R = I²PAK
G = D²PAK
TR = Tape and reel
Blank = Tube
Package information ACST6
10/15 Doc ID 7297 Rev 10
4 Package information
●Epoxy meets UL94, V0
●Cooling method: by conduction (C)
●Recommended torque value (TO220AB, TO220FPAB): 0.4 to 0.6 N·m
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.
Table 6. TO-220AB dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 4.40 4.60 0.173 0.181
C 1.23 1.32 0.048 0.051
D 2.40 2.72 0.094 0.107
E 0.49 0.70 0.019 0.027
F 0.61 0.88 0.024 0.034
F1 1.14 1.70 0.044 0.066
F2 1.14 1.70 0.044 0.066
G 4.95 5.15 0.194 0.202
G1 2.40 2.70 0.094 0.106
H2 10 10.40 0.393 0.409
L2 16.4 typ. 0.645 typ.
L4 13 14 0.511 0.551
L5 2.65 2.95 0.104 0.116
L6 15.25 15.75 0.600 0.620
L7 6.20 6.60 0.244 0.259
L9 3.50 3.93 0.137 0.154
M 2.6 typ. 0.102 typ.
Diam. 3.75 3.85 0.147 0.151
A
C
D
L7
Dia
L5
L6
L9
L4
F
H2
G
G1
L2
F2
F1
E
M
ACST6 Package information
Doc ID 7297 Rev 10 11/15
Table 7. TO-220FPAB dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 4.4 4.6 0.173 0.181
B 2.5 2.7 0.098 0.106
D 2.5 2.75 0.098 0.108
E 0.45 0.70 0.018 0.027
F 0.75 1 0.030 0.039
F1 1.15 1.70 0.045 0.067
F2 1.15 1.70 0.045 0.067
G 4.95 5.20 0.195 0.205
G1 2.4 2.7 0.094 0.106
H 10 10.4 0.393 0.409
L2 16 Typ. 0.63 Typ.
L3 28.6 30.6 1.126 1.205
L4 9.8 10.6 0.386 0.417
L5 2.9 3.6 0.114 0.142
L6 15.9 16.4 0.626 0.646
L7 9.00 9.30 0.354 0.366
Dia. 3.00 3.20 0.118 0.126
H
A
B
Dia
L7
L6
L5
F1
F2
F
D
E
L4
G1
G
L2
L3
Package information ACST6
12/15 Doc ID 7297 Rev 10
Figure 21. Footprint (dimensions in mm)
Table 8. D2PAK dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 4.40 4.60 0.173 0.181
A1 2.49 2.69 0.098 0.106
A2 0.03 0.23 0.001 0.009
B 0.70 0.93 0.027 0.037
B2 1.14 1.70 0.045 0.067
C 0.45 0.60 0.017 0.024
C2 1.23 1.36 0.048 0.054
D 8.95 9.35 0.352 0.368
E 10.00 10.40 0.393 0.409
G 4.88 5.28 0.192 0.208
L 15.00 15.85 0.590 0.624
L2 1.27 1.40 0.050 0.055
L3 1.40 1.75 0.055 0.069
M 2.40 3.20 0.094 0.126
R 0.40 typ. 0.016 typ.
V2 0° 8° 0° 8°
G
L
L3
L2
B
B2
E
* FLAT ZONE NO LESS THAN 2mm
A
C2
D
R
A2
M
V2
C
A1
*
16.90
10.30
8.90 3.70
5.08
1.30
ACST6 Package information
Doc ID 7297 Rev 10 13/15
Table 9. I2PAK double track dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 4.40 4.60 0.173 0.181
A1 2.49 2.69 0.098 0.106
B 0.70 0.93 0.027 0.037
B2 1.14 1.70 0.045 0.067
C 0.45 0.60 0.018 0.024
C2 1.23 1.36 0.048 0.053
D 8.95 9.35 0.352 0.368
E 10 10.40 0.394 0.409
G 4.88 5.28 0.192 0.208
L 16.70 17.5 0.657 0.689
L2 1.27 1.40 0.050 0.055
L3 13.82 14.42 0.544 0.568
E
L2
A
Cropping
direction
C2
D
A1
C
LL3
GB2
B
Ordering information ACST6
14/15 Doc ID 7297 Rev 10
5 Ordering information
Table 10. Ordering information
6 Revision history
Table 11. Document revision history
Order code Marking Package Weight Base Qty Packing mode
ACST610-8FP
ACST6108
TO-220FPAB 2.4 g 50 Tube
ACST610-8G D2PAK 1.5 g 50 Tube
ACST610-8GTR D2PAK 1.5 g 1000 Tape and reel
ACST610-8R I2PAK 2.3 g 50 Tube
ACST610-8T TO-220AB 1.5 g 50 Tube
Date Revision Changes
Jan-2002 7F Previous issue.
09-May-2005 8 Layout update. No content change.
18-Dec-2009 9
Document structure and parameter presentation revised for
consistency with other ACST documents. No technical changes.
Order codes updated.
01-Jul-2010 10 Updated Figure 20.
ACST6
Doc ID 7297 Rev 10 15/15
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