ACST2
Overvoltage protected AC switch
Datasheet - production data
Description
The ACST2 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 2 A.
OUT
COM
G
DPAK
G
OUT
TO-220FPAB
COM
Features
• Triac with overvoltage crowbar technology
• High noise immunity: static dV/dt > 500 V/µs
This ACST2 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 component needs
a low gate current to be activated (IGT < 10 mA)
and still shows a high electrical noise immunity
complying with IEC standards such as
IEC 61000-4-4 (fast transient burst test).
• TO-220FPAB insulated package:
– complies with UL standards (File ref:
E81734)
– Insulation voltage : 2000 VRMS
Figure 1. Functional diagram
OUT
Benefits
• Enables equipment to meet IEC 61000-4-5
G
• High off-state reliability with planar technology
COM
• Needs no external overvoltage protection
• Reduces component count
• Interfaces directly with the micro-controller
• High immunity against fast transients
described in IEC 61000-4-4 standards
Applications
Table 1. Device summary
Symbol
Value
Unit
IT(RMS)
2
A
VDRM/VRRM
800
V
IGT
10
mA
• AC on/off static switching in appliances and
industrial control systems
• Driving low power highly inductive loads like
solenoid, pump, fan, and micro-motor
June 2017
This is information on a product in full production.
DocID13304 Rev 5
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www.st.com
Characteristics
1
ACST2
Characteristics
Table 2. Absolute maximum ratings (limiting values)
Symbol
Parameter
Value
TO-220FPAB
IT(RMS)
On-state rms current (full sine wave)
DPAK
I²
²
t
dI/dt
A
2
Tc = 110 °C
Non repetitive surge peak on-state current F = 60 Hz
(full cycle sine wave, TJ initial = 25 °C)
F = 50 Hz
ITSM
Tc = 105 °C
Unit
I t Value for fusing
tp = 10 ms
Critical rate of rise of on-state current
IG = 2 x IGT, tr = 100 ns
F = 120 Hz
t = 16.7 ms
8.4
t = 20 ms
8.0
A
0.5
A ²s
Tj = 125 °C
50
A/µs
VPP (1)
Non repetitive line peak mains 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
Tj
Storage junction temperature range
Operating junction temperature range
-40 to +150
-40 to +125
°C
260
°C
2000
V
Tl
Maximum lead soldering temperature during 10 s (at 3 mm from plastic case)
VINS(RMS) Insulation RMS voltage (60 seconds)
TO-220FPAB
1. According to test described in IEC 61000-4-5 standard and Figure 17
Table 3. Electrical characteristics (Tj = 25 °C, unless otherwise specified)
Symbol
Test conditions
Quadrant
Unit
IGT(1)
VOUT = 12 V, RL = 33 Ω
I - II - III
MAX
10
mA
VGT
VOUT = 12 V, RL = 33 Ω
I - II - III
MAX
1.1
V
VGD
VOUT = VDRM, RL = 3.3 kΩ,Tj = 125 °C
I - II - III
MIN
0.2
V
MAX
10
mA
I - III
MAX
25
II
MAX
35
VOUT = 67% VDRM gate open, Tj = 125 °C
MIN
500
V/µs
(dV/dt)c = 15 V/µs, Tj = 125 °C
MIN
0.5
A/ms
ICL = 0.1 mA, tp = 1 ms, Tj = 25 °C
MIN
850
V
IH
(2)
IOUT = 100 mA
IL
IG = 1.2 x IGT
dV/dt (2)
(dI/dt)c
VCL
(2)
mA
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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Value
DocID13304 Rev 5
ACST2
Characteristics
Table 4. Static electrical characteristics
Symbol
Test conditions
Value
Unit
VTM(1)
ITM = 2.8 A, tp = 500 µs
Tj = 25 °C
MAX
2
V
VTO(1)
Threshold voltage
Tj = 125 °C
MAX
0.9
V
Dynamic resistance
Tj = 125 °C
MAX
250
mΩ
10
µA
0.5
mA
RD
(1)
IDRM
IRRM
Tj = 25 °C
VOUT = VDRM / VRRM
MAX
Tj = 125 °C
1. For both polarities of OUT pin referenced to COM pin
Table 5. Thermal resistances
Symbol
Parameter
Value
DPAK
Rth(j-c)
Unit
4.5
Junction to case (AC)
TO-220FPAB
7
TO-220FPAB
60
DPAK
70
°C/W
Rth(j-a)
Junction to ambient
SCU (1)= 0.5 cm²
1. SCU = copper surface under tab
Figure 2. Maximum power dissipation versus
on-state RMS current (full cycle)
Figure 3. On-state RMS current versus case
temperature
P(W)
IT(RMS)(A)
2.8
2.4
α=180 °
2.2
2.4
DPAK
2.0
1.8
2.0
TO-220FPAB
1.6
1.4
1.6
1.2
1.2
1.0
0.8
0.8
0.6
180°
0.4
0.4
0.2
0.4
0.6
0.8
1.0
TC(°C)
0.0
0.0
0.0
α=180 °
0.2
IT(RMS)(A)
1.2
1.4
1.6
1.8
2.0
0
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50
75
100
125
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Characteristics
ACST2
Figure 4. On-state RMS current versus ambient
Figure 5. Relative variation of thermal
temperature
impedance versus pulse duration TO-220FPAB
IT(RMS) (A)
K=[Zth/Rth]
1.00
1.8
α=180 °
Printed circuit board FR4
Natural convection
SCU=0.5 cm²
1.6
1.4
Zth(j-c)
1.2
Zth(j-a)
1.0
0.10
0.8
0.6
0.4
0.2
Tamb(°C)
0.0
0
25
50
75
100
125
Figure 6. Relative variation of thermal
impedance versus pulse duration DPAK
1.0E+00
1.0E-04
1.0E-03
1.0E-02
1.0E-01
1.0E+00 1.0E+01 1.0E+02 1.0E+03
Figure 7. Relative variation of gate trigger,
holding and latching current versus junction
temperature (typical value)
K=[Zth/Rth]
IGT , I H, I L [T J ] / I GT , I H, I L [T j =25 ° C]
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
Zth(j-c)
Zth(j-a)
1.0E-01
DPAK
tP(s)
1.0E-02
Figure 8. Relative variation of static dV/dt
versus junction temperature
G9GW > 7 M @ G9GW > 7 M &@
IL & IH
T j (°C)
0
10 20 30 40 50 60 70 80 90 100 110 120 130
Figure 9. Relative variation of critical rate of
decrease of main current versus reapplied
dV/dt (typical values)
9287 9
I GT
-40 -30 -20 -10
1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
TO-220FPAB
tP(s)
0.01
G,GWF > G9GW F @ 6SHFLIL HG G,GW F
$ERYHWHVWHTXLSPHQWFDSDELOLW\
7 M &
4/14
G9GW F9V
DocID13304 Rev 5
ACST2
Characteristics
Figure 10. Relative variation of critical rate of
decrease of main current versus junction
temperature
Figure 11. Surge peak on-state current versus
number of cycles
G,GW F >7 M @ G,GW F >7 M &@
9
I TS M (A )
8
t=20ms
7
One cycle
Non repetitive
T j initial=25 °C
6
5
4
Repetitiv e
T C =110 °C
3
2
DPAK
1
7 M &
Number of cycles
0
1
10
Figure 12. Non repetitive surge peak on-state
current for a sinusoidal pulse with width tp < 10
ms and corresponding value
100.0
ITS M (A ), I2t (A2 s)
100
1000
Figure 13. On-state characteristics
(maximum values)
ITM(A)
1.E+01
T j initial=25 °C
I TSM
10.0
1.E+00
1.0
1.E-01
sinusoidal pulse
with width tP < 10 ms
0.1
0.01
Tj=25 °C
TJ max. :
VTO= 0.90 V
RD= 250 mΩ
VTM(V)
tP (ms)
1.E-02
0.10
1.00
0.0
10.00
Figure 14. Thermal resistance junction to
ambient versus copper surface under tab DPAK
Tj=125 °C
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
Figure 15. Relative variation of clamping
voltage VCL versus junction temperature
5WKMD &:
VCL [T j] / VCL [T j=25 °C]
1.20
1.15
1.10
1.05
1.00
0.95
(SR[\ SULQWHG ERDUG )5 H&8 P
0.90
6&XFPð
T j(°C)
0.85
-40
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40
60
80
100
120
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Application information
ACST2
2
Application information
2.1
Typical application description
The ACST2 device has been designed to switch on and off highly inductive or resistive
loads such as pump, valve, fan, or bulb lamp. Thanks to its high sensitivity
(IGT max = 10 mA), the ACST2 can be driven directly by logic level circuits through a
resistor as shown on the typical application diagram. Thanks to its thermal and turn-off
commutation performances, the ACST2 switch can drive, without any additional snubber, an
inductive load up to 2 A.
Figure 16. AC induction motor control – typical diagram
Line
L
AC Mains
AC LOAD
R
ACST2
Rg
Power supply
2.2
MCU
AC line transient voltage ruggedness
In comparison with standard Triacs, which are not robust against surge voltage, the ACST2
is self-protected against over-voltage, specified by the new parameter VCL. In addition, the
ACST2 is a sensitive device (IGT = 10 mA), but provides a high noise immunity level against
fast transients. The ACST2 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 ACST2 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 ACST2 folds back safely to the on state as shown in Figure 18. The ACST2
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.
6/14
DocID13304 Rev 5
ACST2
Application information
Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads for
IEC 61000-4-5 standards
R = 20 Ω, L = 10 µH, VPP = 2 kV
Surge generator
2kV surge
Rgene
Model of the load
Filtering unit
R
L
ACST210-8x
AC Mains
Rg
Figure 18. Typical current and voltage waveforms across the ACST2 during
IEC 61000-4-5 standard test
V peak = V CL
1.2/50 µs voltage surge
V
0
8/20 µs current surge
I
0
2.3
Electrical noise immunity
The ACST2 is a sensitive device (IGT = 10 mA) and can be controlled directly though a
simple resistor by a logic level circuit, and still provides a high electrical noise immunity. The
intrinsic immunity of the ACST2 is shown by the specified dV/dt equal to 500 V/µs @ 125
°C. This immunity level is 5 to 10 times higher than the immunity provided by an equivalent
standard technology Triac with the same sensitivity. In other words, the ACST2 is sensitive,
but has an immunity usually available only for non-sensitive device (IGT higher than 35 mA).
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Package information
3
ACST2
Package information
•
Epoxy meets UL94, V0
•
Recommended torque (TO-220FPAB): 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.
3.1
TO-220FPAB package information
Figure 19. TO-220FPAB package outline
A
B
H
Dia
L6
L2
L7
L3
L5
F1
L4
F2
F
G1
G
8/14
D
DocID13304 Rev 5
E
ACST2
Package information
Table 6. TO-220FPAB package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
Inches
Max.
Min.
Typ.
Max.
A
4.4
4.6
0.1730
0.1809
B
2.5
2.7
0.0983
0.1062
D
2.5
2.75
0.0983
0.1081
E
0.45
0.70
0.0177
0.0275
F
0.75
1
0.0295
0.0393
F1
1.15
1.70
0.0452
0.0669
F2
1.15
1.70
0.0452
0.0669
G
4.95
5.20
0.1947
0.2045
G1
2.4
2.7
0.0944
0.1062
H
10
10.4
0.3932
0.4090
L2
16
0.6292
L3
28.6
30.6
1.1247
1.2033
L4
9.8
10.6
0.3854
0.4168
L5
2.9
3.6
0.1140
0.1416
L6
15.9
16.4
0.6252
0.6449
L7
9.00
9.30
0.3539
0.3657
Dia.
3.00
3.20
0.1180
0.1258
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Package information
3.2
ACST2
DPAK package information
$
Figure 20. DPAK package outline
(
E
+
'
'
/
F
(
/
$
H
E
F
$
/
9
H
Note:
10/14
This package drawing may slightly differ from the physical package. However, all the
specified dimensions are guaranteed.
DocID13304 Rev 5
ACST2
Package information
Table 7. DPAK package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
Inches
Max.
Min.
Typ.
Max.
A
2.18
2.40
0.086
0.094
A1
0.90
1.10
0.035
0.043
A2
0.03
0.23
0.001
0.009
b
0.64
0.90
0.025
0.035
b4
4.95
5.46
0.195
0.215
c
0.46
0.61
0.018
0.024
c2
0.46
0.60
0.018
0.023
D
5.97
6.22
0.235
0.244
D1
E
5.1
6.35
0.201
6.73
0.250
0.264
E1
4.32
0.170
e
2.286
0.09
e1
4.572
0.18
H
9.35
10.40
0.368
0.409
L
1.00
1.78
0.039
0.070
L2
1.27
0.05
L4
0.60
1.02
0.023
0.040
V2
0°
8°
0°
8°
Figure 21. Footprint (dimensions in mm)
6.7
3.0
3.0
5.094
6.7
B
A
1.6
The device must be positioned within
0.05 A B
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Ordering information
4
ACST2
Ordering information
Figure 22. Ordering information scheme
ACS T 2 10 - 8
B TR
AC switch
Topology
T = Triac
On-state rms current
2=2A
Sensitivity
10 = 10 mA
Voltage
8 = 800 V
Package
FP = TO-220FPAB
B = DPAK
Delivery mode
TR = Tape and reel (DPAK)
Blank = Tube (TO-220FPAB, DPAK)
Table 8. Ordering information
Order code
Marking
ACST210-8FP
ACST210-8B
ACST210-8BTR
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ACST2108
Package
Weight
Base Qty
Packing mode
TO-220FPAB
2.4g
50
Tube
DPAK
0.3g
50
Tube
DPAK
0.3g
2500
Tape and Reel
DocID13304 Rev 5
ACST2
5
Revision history
Revision history
Table 9. Document revision history
Date
Revision
Changes
01-Mar-2007
1
Initial release.
13-Apr-2010
2
Updated ECOPACK statement. Reformatted for consistency with other
datasheets in this product class.
01-Jul-2010
3
Updated Figure 22.
24-May-2014
4
Updated DPAK package information and reformatted to current standard.
14-Jun-2017
5
Updated features in cover page and Table 2.
Updated Figure 8, Figure 9, Figure 10, Figure 14 and Section 3.
Minor text changes.
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ACST2
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