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ACST8
Overvoltage protected AC switch
Features

OUT
Triac with overvoltage protection High noise immunity: static dV/dt > 2000 V/s TO-220FPAB insulated package: 1500 V rms
G OUT 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
TO-220AB ACST830-8T
OUT
TO-220FPAB ACST830-8FP
G COM
Applications

DPAK ACST830-8G
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
Figure 1.
Functional diagram
OUT
Description
The ACST8 series belongs to the ACSTM/ ACST power switch family built around A.S.D.(R) (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. ACST8 shows a high noise immunity complying with IEC standards such as IEC 61000-4-4 (fast transient burst test).
G COM
Table 1.
Symbol IT(RMS)
Device summary
Value 8 800 30 Unit A V mA
VDRM/VRRM IGT
TM: ACS is a trademark of STMicroelectronics. (R): A.S.D. is a registered trademark of STMicroelectronics
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Characteristics
ACST8
1
Table 2.
Symbol
Characteristics
Absolute ratings (limiting values)
Parameter TO-220FPAB IT(RMS) On-state rms current (full sine wave) TO-220AB / D2PAK D2PAK with 1 cm2 Cu ITSM I 2t dI/dt VPP (1) PG(AV) PGM IGM Tstg Tj Tl Non repetitive surge peak on-state current Tj initial = 25 C, full cycle sine wave Thermal constraint for fuse selection Non repetitive on-state current critical rate of rise IG = 10 mA (tr < 100 ns) Non repetitive line peak pulse voltage Average gate power dissipation Peak gate power dissipation (tp = 20 ms) Peak gate current (tp = 20 ms) Storage temperature range Operating junction temperature range Maximum lead soldering temperature during 10 s TO-220FPAB F = 50 Hz F = 60 Hz Tcase = 91 C 8 Tcase = 105 C Tamb = 43 C tp = 20 ms tp = 16.7 ms tp = 10 ms Rate period > 1 mn Tj = 25 C Tj = 125 C Tj = 125 C Tj = 125 C 2 80 84 42 100 2 0.1 10 1.6 - 40 to + 150 - 40 to + 125 260 1500 A A A A2s A/s kV W W A C C C V A Value Unit
VINS(RMS) Insulation rms voltage
1. According to test described in IEC 61000-4-5 standard and Figure 18.
Table 3.
Symbol IGT(1) VGT VGD IH
(2)
Electrical characteristics per switch
Test conditions VOUT = 12 V, RL = 33 VOUT = 12V, RL = 33 VOUT = VDRM, RL = 3.3 k IOUT = 500 mA IG = 1.2 x IGT
(2) (2)
Quadrant
Tj 25 C 25 C 125 C 25 C Max Max Min Max Max Min Min Min
Value 30 1.0 0.2 30 50 2000 8 850
Unit mA V V mA mA V/s A/ms V
I - II - III I - II - III I - II - III
IL dV/dt
I - II - III
25 C 125 C 125 C 25 C
VOUT = 67% VDRM, gate open Without snubber ICL = 0.1 mA, tp = 1 ms
(dI/dt)c VCL
1. Minimum IGT is guaranteed at 5% of IGT(Max) 2. For either positive or negative polarity of OUT pin with reference to COM pin
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ACST8 Table 4.
Symbol VTM VTO RD IDRM IRRM ITM = 11.3 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 Max Tj = 125 C 1 mA Max Max Max Value 1.5 0.9 50 20 Unit V V m A
Table 5.
Symbol
Thermal resistances
Parameter Junction to ambient TO-220FPAB TO-220AB D2PAK TO-220FPAB Value 60 45 3.6 2 C/W Unit
Rth(j-a) Junction to ambient (soldered on 1 cm2 copper pad) Rth(j-c) Junction to case (AC)
TO-220AB, D2PAK
Figure 2.
Maximum power dissipation versus Figure 3. on-state rms current
IT(RMS)(A)
9 8 7 6 5 4
=180
On-state rms current versus case temperature (full cycle)
P(W)
10 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8
180
=180
TO-220AB D2PACK TO-220FPAB
3 2
IT(RMS)(A)
1 0 0 25
TC(C)
50 75 100 125
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Characteristics
ACST8
Figure 4.
On-state rms current versus ambient temperature (free air convection, fulle cycle)
Figure 5.
Relative variation of thermal impedance versus pulse duration
IT(RMS)(A)
3.0
=180
D2PAK Copper surface = 1cm2
K=[Zth/Rth]
1.0E+00
TO-220AB Zth(j-c) Zth(j-a) TO-220FPAB
2.5 2.0
TO-220
1.5 1.0 0.5
1.0E-01
TO-220AB TO-220FPAB
Tamb(C)
0.0 0 25 50 75 100 125
tp(s)
1.0E-02 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 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
IGT, VGT[T j] / IGT, VGT[T j=25 C]
2.5
IGT Q3
IH, IL [T j] / IH, IL [T j=25 C]
Typical values
IGT Q1-Q2
2.0
2.0
1.5
1.5
1.0
1.0 0.5
VGT Q1-Q2-Q3
IL
0.5
Tj(C) 0.0 -50 -25 0 25 50 75 100 125
0.0 -50 -25 0 25
Tj(C) 50 75
IH
100
125
Figure 8.
Surge peak on-state current versus Figure 9. number of cycles
Non repetitive surge peak on-state current and corresponding value of I2t versus sinusoidal pulse width
90 80 70 60 50 40 30 20 10 0
ITSM(A)
ITSM(A), It (As)
1000
Tj initial=25 C
t=20ms
dI/dt limitation: 100 A/s
ITSM
Non repetitive Tj initial=25 C
One cycle
100
It
Repetitive TC=105 C
10
Number of cycles 1 10 100 1000
sinusoidal pulse with width tP < 10 ms
tP(ms) 0.10 1.00 10.00
1 0.01
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ACST8
Characteristics
Figure 10. On-state characteristics (maximum Figure 11. Relative variation of critical rate of values) decrease of main current (dI/dt)c versus junction temperature
ITM (A)
100
(dI/dt)c[Tj] / (dI/dt)c[Tj=125C]
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
5
10
Tj=125 C
Tj=25 C
VTM (V) 2 3 4
Tj max : Vto = 0.90 V Rd = 50 m
Tj(C)
25 50 75 100 125
1 0 1
Figure 12. Relative variation of static dV/dt immunity versus junction temperature (gate open)
dV/dt[Tj] / dV/dt[Tj=125C]
11 10 9 8 7 6 5 4 3 2 1 0 25 50 75 100 125
VD=VR=530 V
Figure 13. Relative variation of leakage current versus junction temperature
1.0E+00
IDRM/IRRM [Tj;V DRM/ VRRM]/IDRM/IRRM [Tj=125C; 800V]
VDRM=VRRM=800 V
Different blocking voltages
1.0E-01
VDRM=VRRM=600 V
1.0E-02
VDRM=VRRM=200 V
Tj(C)
1.0E-03 25 50 75
Tj(C)
100 125
Figure 14. Relative variation of clamping voltage (VCL) versus junction temperature (minimum values)
VCL [Tjj/VCL[Tj=25C]
1.15
Figure 15. Thermal resistance junction to ambient versus copper surface under tab
80 70
Rth(j-a) (C/W)
Printed circuit board FR4, copper thickness = 35 m
DPAK
1.10
60
1.05
50 40 30 20
1.00
0.95
0.90
Tj (C)
0.85 -50 -25 0 25 50 75 100 125
10
SCU(cm)
0 0 5 10 15 20 25 30 35 40
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Application information
ACST8
2
2.1
Application information
Typical application description
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 C L Phase shift capacitor + protective air inductance ACST Rg Rg Selection of the rotor direction
ACST
Vcc MCU
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ACST8
Application 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 VCL. 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 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 H, Vsurge = 2 kV Rg = 82 Surge generator
2kV surge
Rgene
Filtering unit
Model of the load
R
L ACST8
AC Mains Rg
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Ordering information scheme Figure 18. Typical current and voltage waveforms across the ACST8 during IEC 61000-4-5 standard test
Vpeak = VCL 1.2/50 s voltage surge
ACST8
V 0
Ipeak = 160 A I
8/20 s current surge 0 dI/dt = 180 A/s
3
Ordering information scheme
Figure 19. Ordering information scheme
ACS T 8 30 - 8
AC switch Topology T = Triac On-state rms current 8=8A Triggering gate current 30 = 30 mA Repetitive peak off-state voltage 8 = 800 V Package FP = TO-220FPAB T = TO-220AB G = D2PAK Delivery mode TR = Tape and reel Blank = Tube
FP TR
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ACST8
Package 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(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-220AB dimensions
Dimensions Ref. Millimeters Min. A C
H2 Dia L5 L7 L6 L2 F2 F1 L9 L4 F G1 G M E D C A
Inches Min. 0.173 0.048 0.094 0.019 0.024 0.044 0.044 0.194 0.094 0.393 Max. 0.181 0.051 0.107 0.027 0.034 0.066 0.066 0.202 0.106 0.409
Max. 4.60 1.32 2.72 0.70 0.88 1.70 1.70 5.15 2.70 10.40
4.40 1.23 2.40 0.49 0.61 1.14 1.14 4.95 2.40 10
D E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 M Diam.
16.4 typ. 13 2.65 15.25 6.20 3.50 14 2.95 15.75 6.60 3.93
0.645 typ. 0.511 0.104 0.600 0.244 0.137 0.551 0.116 0.620 0.259 0.154
2.6 typ. 3.75 3.85
0.102 typ. 0.147 0.151
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Package information Table 7. TO-220FPAB dimensions
Dimensions Ref. Millimeters Min. A B
A H B
ACST8
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 0.067 0.205 0.106 0.409
Max. 4.6 2.7 2.75 0.70 1 1.70 1.70 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 Diam.
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ACST8 Table 8. D2PAK dimensions
Package information
Dimensions Ref. Millimeters Min. A
A E L2
Inches Min. 0.173 0.098 0.001 0.027 0.045 0.017 0.048 0.352 0.393 0.192 0.590 0.050 0.055 0.094 Max. 0.181 0.106 0.009 0.037 0.067 0.024 0.054 0.368 0.409 0.208 0.624 0.055 0.069 0.126
Max. 4.60 2.69 0.23 0.93 1.70 0.60 1.36 9.35 10.40 5.28 15.85 1.40 1.75 3.20
4.40 2.49 0.03 0.70 1.14 0.45 1.23 8.95 10.00 4.88 15.00 1.27 1.40 2.40
A1
C2
A2 B
D
L L3 A1 B2 B G A2 R
B2 C C2
C
D E G L
M
*
V2
L2 L3
* FLAT ZONE NO LESS THAN 2mm
M R V2
0.40 typ. 0 8
0.016 typ. 0 8
Figure 20. Footprint (dimensions in mm)
16.90
10.30 1.30
5.08
8.90
3.70
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Ordering information
ACST8
5
Ordering information
Table 9. Ordering information
Marking Package TO-220FPAB ACST8308 TO-220AB D2PAK Weight 2.4 g 2.3 g 1.5 g Base qty 50 50 500 Packing mode Tube Tube Tape and reel
Order code ACST830-8FP ACST830-8T ACST830-8GTR
6
Revision history
Table 10.
Date Jan-2002 08-Nov-2004 24-Nov-2004 18-Dec-2009
Document revision history
Revision 4B 5 6 7 Last update. TO-220AB and D2PAK packages added. Table 6 page 3: IGT parameter added Added ECOPACK statement. Reformatted for consistency with other datasheets in this product class. Order codes updated. Changes
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ACST8
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