■ 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
OUT
G
OUT
COM
TO-220AB
ACST830-8T
OUT
2
D
TO-220FPAB
ACST830-8FP
G
COM
PAK
ACST830-8G
Figure 1.Functional diagram
OUT
COM
G
OUT
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 device 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.
Table 1.Device summary
SymbolValueUnit
I
T(RMS)
V
DRM/VRRM
I
GT
ACST8 shows a high noise immunity complying
with IEC standards such as IEC 61000-4-4 (fast
transient burst test).
February 2011Doc ID 7463 Rev 91/13
TM: ACS is a trademark of STMicroelectronics.
®: A.S.D. is a registered trademark of
STMicroelectronics
G
COM
8A
800V
30mA
www.st.com
13
CharacteristicsACST8
1 Characteristics
Table 2.Absolute ratings (limiting values)
SymbolParameterValueUnit
TO-220FPABT
TO-220AB /
2
I
On-state rms current (full sine wave)
T(RMS)
D
PA K
D2PAK with
1cm2 Cu
TSM
2
I
t Thermal constraint for fuse selection tp = 10 ms 42A2s
dI/dt
VPP
P
G(AV)
P
GM
I
GM
T
stg
T
j
T
l
V
INS(RMS)
1. According to test described in IEC 61000-4-5 standard and Figure 18.
Table 3.Electrical characteristics per switch
initial = 25 °C, full cycle sine wave
T
j
Critical rate of rise on-state current
= 2 x I
I
G
(1)
Non repetitive line peak pulse voltage Tj = 25 °C2 kV
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 16. AC induction motor control – typical diagram
AC Motor
AC
induction
motor
AC Mains
Vcc
MCU
ACST
Rg
C
L
ACST
Phase shift capacitor +
protective air inductance
Rg
Selection of the
rotor direction
6/13Doc ID 7463 Rev 9
ACST8Application information
2.2 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
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 ACST8
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
R = 13 , L = 2 µH, Vsurge = 2 kV
Rg = 82ΩΩ
Surge generator
2kV surge
. The ACST8
CL
AC Mains
Filtering unit
Rgene
Model of the load
R
L
ACST8
Rg
Doc ID 7463 Rev 97/13
Ordering information schemeACST8
Figure 18. Typical current and voltage waveforms across the ACST8 during
IEC 61000-4-5 standard test
V
peak=VCL
1.2/50 µs voltage surge
V
0
I
= 160 A
peak
I
8/20 µs current surge
0
dI/dt = 180 A/µs
3 Ordering information scheme
Figure 19. Ordering information scheme
AC switch
Topology
T = Triac
On-state rms current
8 = 8 A
Triggering gate current
30 = 30 mA
Repetitive peak off-state voltage
8 = 800 V
Package
FP = TO-220FPAB
T = TO-220AB
G = D2PA K
Delivery mode
TR = Tape and reel
Blank = Tube
ACS T 8 30 - 8 G TR
8/13Doc ID 7463 Rev 9
ACST8Package information
4 Package information
●Epoxy meets UL94, V0
●Recommended torque: 0.4 to 0.6 N·m
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK
Table 6.TO-220AB dimensions
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
.
Dimensions
Ref.
MillimetersInches
Min.Max.Min.Max.
A4.404.600.1730.181
C1.231.320.0480.051
H2
Dia
A
C
D2.402.720.0940.107
E0.490.700.0190.027
L2
F2
F1
L5
L6
L9
L4
F
G1
L7
F0.610.880.0240.034
F11.141.700.0440.066
F21.141.700.0440.066
G4.955.150.1940.202
D
G12.402.700.0940.106
H21010.400.3930.409
L216.4 typ.0.645 typ.
M
E
L413140.5110.551
L52.652.950.1040.116
G
L615.2515.750.6000.620
L76.206.600.2440.259
L93.503.930.1370.154
M2.6 typ.0.102 typ.
Diam.3.753.850.1470.151
Doc ID 7463 Rev 99/13
Package informationACST8
Table 7.TO-220FPAB dimensions
Dimensions
Ref.
MillimetersInches
Min.Max.Min.Max.
A4.44.60.1730.181
A
H
B
B2.52.70.0980.106
D2.52.750.0980.108
E0.450.700.0180.027
Dia
L6
L2
L3
L5
F1
L4
F2
F
G1
G
D
L7
E
F0.7510.0300.039
F11.151.700.0450.067
F21.151.700.0450.067
G4.955.200.1950.205
G12.42.70.0940.106
H1010.40.3930.409
L216 Typ.0.63 Typ.
L328.630.61.1261.205
L49.810.60.3860.417
L52.93.60.1140.142
L615.916.40.6260.646
L79.009.300.3540.366
Diam.3.003.200.1180.126
10/13Doc ID 7463 Rev 9
ACST8Package information
Table 8.D
L2
L
L3
2
PAK dimensions
E
A1
B2
B
G
* FLAT ZONE NO LESSTHAN 2mm
Dimensions
Ref.
MillimetersInches
Min.Max.Min.Max.
A4.404.600.1730.181
A
A12.492.690.0980.106
C2
A20.030.230.0010.009
B0.700.930.0270.037
D
B21.141.700.0450.067
C0.450.600.0170.024
C21.231.360.0480.054
C
R
D8.959.350.3520.368
E10.0010.400.3930.409
A2
G4.885.280.1920.208
L15.0015.850.5900.624
M
*
V2
L21.271.400.0500.055
L31.401.750.0550.069
M2.403.200.0940.126
Figure 20. Footprint (dimensions in mm)
16.90
10.30
8.90
R0.40 typ.0.016 typ.
V20°8°0°8°
5.08
1.30
3.70
Doc ID 7463 Rev 911/13
Ordering informationACST8
5 Ordering information
Table 9.Ordering information
Order codeMarkingPackageWeightBase qtyPacking mode
ACST830-8FP
ACST830-8TTO-220AB2.3 g50Tube
ACST8308
ACST830-8GTRD
6 Revision history
Table 10.Document revision history
DateRevisionChanges
Jan-20024BLast update.
08-Nov-20045TO-220AB and D2PAK packages added.
24-Nov-20046Table 6 page 3: I
18-Dec-20097
01-Jul-20108Updated Figure 19.
07-Feb-20119Updated Table 2.
TO-220FPAB2.4 g50Tube
2
PAK1.5 g500Tape and reel
parameter added
GT
Added ECOPACK statement. Reformatted for consistency with other
datasheets in this product class. Order codes updated.
12/13Doc ID 7463 Rev 9
ACST8
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