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ACS120-7ST
Triac, Switch, 700 V, 2 A, TO-220AB, 1 V, 20 A, 45 mA
⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.
- Manufacturer: STMICROELECTRONICS
- Product type:
- Peak Repetitive Off-State Voltage, Vdrm:700V; On State RMS Current IT(rms):2A; Triac Case Style:TO-220AB; Gate Trigger Current Max (QI), Igt:-; Gate Trigger; Available until stocks are exhausted
- MSL: -
- SVHC: No SVHC (17-Dec-2015)
- No. of Pins: -
- Product Range: -
- Triac Case Style: TO-220AB
- Thyristor Mounting: Through Hole
- Holding Current Max: 45mA
- On State RMS Current: 2A
- Peak On State Voltage: 1.3V
- Gate Trigger Voltage Max: 1V
- Operating Temperature Max: 125°C
- Peak Non Repetitive Surge Current: 20A
- Peak Repetitive Off State Voltage: 700V
| Delivery and price | |
|---|---|
| Units per pack | 100 |
| Price | 0.688 € |
| Current stock | 200+ |
| Lead time | 30 days |
Datasheet
## **ACS120**
## Overvoltage protected AC switch (ACS™)
**Datasheet** - **production data**
## **Applications**
- AC static switching in appliance control systems
- Drive of low power high inductive or resistive loads like:
- Relay, valve, solenoid, dispenser
- Pump, fan, micro-motor
- Defrost heater
## **Description**
The ACS120 belongs to the AC line switch family. This high performance switch circuit is able to control a load of up to 2 A.
## **Features**
- Blocking voltage: VDRM / VRRM = +/- 700 V
The ACS™ switch embeds a high voltage clamping structure to absorb the inductive turn off energy and a gate level shifter driver to separate the digital controller from the main switch. It is triggered with a negative gate current flowing out of the gate pin.
## **Figure 1. Functional diagram**
- Avalanche controlled: VCL typ. = 1100 V
- Nominal conducting current: IT(RMS) = 2 A
- Gate triggering current: IGT < 10 mA
- High noise immunity: static dV/dt > 500 V/µs
## **Benefits**
- Needs no more external protection snubber or varistor
- Enables equipment to meet IEC 61000-4-5
- Reduces component count up to 80%
- Interfaces directly with the micro controller
- Eliminates any gate kick back on the microcontroller
- Allows straightforward connection of several AC switches on same cooling pad
1/17
May 2016
DocID9469 Rev 4
This is information on a product in full production.
_www.st.com_
**Characteristics**
**ACS120**
## **1 Characteristics**
**Table 1. Absolute ratings (limiting values) For either positive or negative polarity of pin OUT voltage in respect to pin COM voltage**
|**Symbol**|**Parameter**|||**Value**|**Unit**|
|---|---|---|---|---|---|
|VDRM/VRRM|Repetitive peak off-state voltage|||700|V|
|IT(RMS)|On-state RMS current full cycle sine wave<br>50 to 60 Hz|DPAK<br>TO-220FPAB<br>TO-220AB|TC= 119 °C|2|A|
||||TC= 117 °C|||
||||TC= 119 °C|||
|ITSM|Non repetitive surge peak on-state current<br>TJinitial = 25 °C, full cycle sine wave||tP= 20 ms|20|A|
||||tP= 16.7 ms|21|A|
|I2t|Fusing capability||tP= 10 ms|2.6|A2s|
|dI/dt|Repetitive on-state current critical rate of<br>rise IG= 10 mA (tr< 100 ns)|Tj= 125 °C|f = 120 Hz|50|A/µs|
|VPP|Non repetitive line peak pulse voltage(1)|||2|kV|
|Tstg|Storage temperature range|||- 40 to + 150|°C|
|TJ|Operating junction temperature range|||- 30 to + 125|°C|
|TL|Maximum lead soldering temperature during|10 s||260|°C|
1. According to test described by IEC 61000-4-5 standard and _Figure 17_ .
**Table 2. Switch Gate characteristics (maximum values)**
||**Table 2. Switch Gate characteristics(maximum values)**|||
|---|---|---|---|
|**Symbol**|**Parameter**|**Value**|**Unit**|
|PG(AV)|Average gate power dissipation|0.1|W|
|IGM|Peak gate current (tP= 20 µs)|1|A|
|VGM|Peak positive gate voltage (in respect to pin COM)|5|V|
**Table 3. Thermal resistances**
||**Table 3. Thermal resistances**|**Table 3. Thermal resistances**|**Table 3. Thermal resistances**|||
|---|---|---|---|---|---|
|**Symbol**|**Parameter**|||**Value**|**Unit**|
|Rth (j-a)|Junction to ambient|S = 0.5 cm2(1)|DPAK|70|°C/W|
|||TO-220FPAB||60|°C/W|
|||TO-220AB||60|°C/W|
|Rth (j-c)|Junction to case|DPAK||2.6|°C/W|
|||TO-220FPAB||3.5|°C/W|
|||TO-220AB||2.6|°C/W|
1. S = Copper surface under tab
2/17
DocID9469 Rev 4
**ACS120**
**Characteristics**
**Table 4. Parameter description**
||**Table 4. Parameter description**|
|---|---|
|**Symbol**|**Parameter description**|
|IGT|Triggering gate current|
|VGT|Triggering gate voltage|
|VGD|Non-triggering gate voltage|
|IH|Holding current|
|IL|Latching current|
|VTM|Peak on-state voltage drop|
|VTO|On state threshold voltage|
|Rd|On state dynamic resistance|
|IDRM / IRRM|Maximum forward or reverse leakage current|
|dV/dt|Critical rate of rise of off-state voltage|
|(dV/dt)c|Critical rate of rise of commutating off-state voltage|
|(dI/dt)c|Critical rate of decrease of commutating on-state current|
|VCL|Clamping voltage|
|ICL|Clamping current|
**Table 5. Electrical characteristics**
|**Symbol**|**Test conditions**|**Test conditions**|||**Values**|**Unit**|
|---|---|---|---|---|---|---|
|IGT|VOUT= 12V (DC), RL= 140 Ω|QII -QIII|TJ= 25°C|Max|10|mA|
|VGT|VOUT= 12V (DC), RL= 140 Ω|QII -QIII|TJ= 25 °C|Max|1|V|
|VGD|VOUT= VDRM, RL= 3.3 kΩ||TJ= 125 °C|Min|0.15|V|
|IH|IOUT= 100 mA gate open||TJ= 25 °C|Max|45|mA|
|IL|IG= 20 mA||TJ= 25 °C|Max|65|mA|
|VTM|IOUT= 2.8 A, tp= 380 µs||TJ= 25 °C|Max|1.3|V|
|VTO|||TJ= 125 °C|Max|0.85|V|
|Rd|||TJ= 125 °C|Max|200|mΩ|
|IDRM/IRRM|VOUT= 700 V||TJ= 25 °C|Max|2|µA|
||||TJ= 125 °C|Max|200||
|dV/dt|VOUT= 460 V gate open||TJ= 110 °C|Min|500|V/µs|
|(dI/dt)c|(dV/dt)c = 20 V/µs||TJ= 125 °C|Min|1|A/ms|
|VCL|ICL= 1 mA, tp= 1 ms||TJ= 25 °C|Typ|1100|V|
3/17
DocID9469 Rev 4
**Characteristics**
**ACS120**
## **Figure 2. Maximum power dissipation versus RMS on-state current**
## **Figure 4. On-state RMS current versus ambient temperature**
**Figure 3. On-state RMS current versus case temperature**
**Figure 5. Relative variation of thermal impedance versus pulse duration**
**==> picture [168 x 60] intentionally omitted <==**
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afince e {PTerrrooheetoie AT<br>ee | KOZ<br>1.E-01 a a<br>**----- End of picture text -----**<br>
**Figure 6. Relative variation of gate trigger, holding and latching current versus junction temperature**
**Figure 7. Relative variation of static dV/dt versus junction temperature**
4/17
DocID9469 Rev 4
**ACS120**
**Characteristics**
**Figure 8. Relative variation of critical rate of decrease of main current versus reapplied dV/dt (typical values)**
**Figure 10. Surge peak on-state current versus number of cycles**
**Figure 12. On-state characteristics (maximum values)**
**Figure 9. Relative variation of critical rate of decrease of main current versus junction temperature**
**Figure 11. Non repetitive surge peak on-state current for a sinusoidal pulse with width t < 10 ms p**
**Figure 13. Thermal resistance junction to ambient versus copper surface under tab**
5/17
DocID9469 Rev 4
**AC line switch basic application**
**ACS120**
## **2 AC line switch basic application**
The ACS120 device is well adapted to washing machine, dishwasher, tumble drier, refrigerator, air-conditioning systems, and cookware. It has been designed especially to switch on and off low power loads such as solenoid, valve, relay, dispenser, micro-motor, pump, fan and defrost heaters.
This AC switch is triggered by a negative gate current flowing out of the gate pin G. It can be driven directly by the digital MCU through a resistor as shown on the typical application diagram.
Thanks to its thermal and turn off commutation performance, the ACS120 switch can drive, with no additional turn off snubber, an inductive load up to 2 A.
## **Figure 14. Typical application diagram**
**==> picture [405 x 236] intentionally omitted <==**
**----- Start of picture text -----**<br>
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## **2.1 Protection against overvoltage: the best choice is ACS**
In comparison with standard Triacs the ACS120 is over-voltage self-protected, as specified by the new parameter VCL. This feature is useful in two operating conditions: in case of turn off of very inductive load, and in case of surge voltage that can occur on the electrical network.
6/17
DocID9469 Rev 4
**ACS120**
**AC line switch basic application**
## **2.2 High inductive load switch-off: turn-off overvoltage clamping**
With high inductive and low RMS current loads the rate of decrease of the current is very low. An overvoltage can occur when the gate current is removed and the OUT current is lower than IH.
As shown in _Figure 15 and Figure 16_ , at the end of the last conduction half-cycle, the load current decreases (1). The load current reaches the holding current level IH (2), and the ACS turns off (3). The water valve, as an inductive load (up to 15 H), reacts as a current generator and an overvoltage is created, which is clamped by the ACS (4). The current flows through the ACS avalanche and decreases linearly to zero. During this time, the voltage across the switch is limited to the clamping voltage VCL. The energy stored in the inductance of the load is dissipated in the clamping section that is designed for this purpose. When the energy has been dissipated, the ACS voltage falls back to the mains voltage value (230 V rms, 50 Hz) (5).
**Figure 15. Turn-off operation of the ACS120 Figure 16. ACS120 switch static characteristic switch with an electro-valve**
_Note: Same working principle described in item 2.2 is valid for both current directions._
7/17
DocID9469 Rev 4
**AC line switch basic application**
**ACS120**
## **2.3 Alternating current mains transient voltage ruggedness**
The ACS120 switch is able to withstand safely the AC mains transients either by clamping the low energy spikes or by breaking-over when subjected to high energy shocks, even with high turn-on current rises. The test circuit shown in _Figure 17_ is representative of the final ACS120 application, and is also used to test the AC switch according to the IEC 61000-4-5 standard conditions. Thanks to the load limiting the current, the ACS120 switch withstands the voltage spikes up to 2 kV above the peak mains voltage. The protection is based on an overvoltage crowbar technology. Actually, the ACS120 breaks over safely as shown in _Figure 18_ . The ACS120 recovers its blocking voltage capability after the surge (switch-off back at the next zero crossing of the current). Such non-repetitive tests can be done 10 times on each AC mains voltage polarity.
**Figure 17. Overvoltage ruggedness test circuit for resistive and inductive loads**
**Figure 18. Current and voltage of the ACS120 during IEC 61000-4-5 standard test with R, L and VPP**
8/17
DocID9469 Rev 4
**ACS120**
**Package information**
## **3 Package information**
- Epoxy meets UL94-V0
- Lead-free package
- Recommended torque: 0.4 to 0.6 N·m (TO-220AB, TO-220FPAB)
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**
**==> picture [190 x 11] intentionally omitted <==**
**----- Start of picture text -----**<br>
Figure 19. TO-220FPAB package outline<br>**----- End of picture text -----**<br>
**==> picture [344 x 403] intentionally omitted <==**
9/17
DocID9469 Rev 4
**ACS120**
**Package information**
**Table 6. TO-220FPAB package mechanical data**
||**Table 6. TO-220FPABpackage mechanical data**|**Table 6. TO-220FPABpackage mechanical data**|**Table 6. TO-220FPABpackage mechanical data**|**Table 6. TO-220FPABpackage mechanical data**|
|---|---|---|---|---|
|**Ref.**|**Dimensions**||||
||**Millimeters**||**Inches(1)**||
||**Min.**|**Max.**|**Min.**|**Max.**|
|A|4.40|4.60|0.1732|0.1811|
|B|2.50|2.70|0.0984|0.1063|
|D|2.50|2.75|0.0984|0.1083|
|E|0.45|0.70|0.0177|0.0276|
|F|0.75|1.00|0.0295|0.0394|
|F1|1.15|1.70|0.0453|0.0669|
|F2|1.15|1.70|0.0453|0.0669|
|G|4.95|5.20|0.1949|0.2047|
|G1|2.40|2.70|0.0945|0.1063|
|H|10.00|10.40|0.3937|0.4094|
|L2|16.00 Typ.||0.6299 Typ.||
|L3|28.60|30.60|1.1260|1.2047|
|L4|9.80|10.60|0.3858|0.4173|
|L5|2.90|3.60|0.1142|0.1417|
|L6|15.90|16.40|0.6260|0.6457|
|L7|9.00|9.30|0.3543|0.3661|
|Dia.|3.00|3.20|0.1181|0.1260|
1. Inches only for reference.
10/17
DocID9469 Rev 4
**ACS120**
**Package information**
## **3.2 DPAK package information**
## **Figure 20. DPAK package outline**
**==> picture [316 x 356] intentionally omitted <==**
_Note: This package drawing may slightly differ from the physical package. However, all the specified dimensions are guaranteed._
11/17
DocID9469 Rev 4
**ACS120**
**Package information**
**Table 7. DPAK package mechanical data**
||**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|**Table 7. DPAK package mechanical datapackage mechanical dataackage mechanical datage mechanical datae mechanical data**|
|---|---|---|---|---|---|---|
|**Ref.**<br>~~a~~|**Dimensions**<br>~~a~~||||||
||**Millimeters**<br>~~a~~<br>~~ee~~<br>~~a~~<br>~~eeee~~|||**Inches(1)**<br>~~a~~<br>~~ee~~<br>~~eeeeee~~|||
||**Min.**<br>~~a~~|**Typ.**<br>~~ee~~|**Max.**<br>~~ee~~|**Min.**<br>~~ee~~|**Typ.**<br>~~ee~~|**Max.**<br>~~ee~~|
|A<br>~~a~~|2.18<br>~~a~~<br>~~ee~~|~~ee~~<br>~~ee~~|2.40<br>~~ee~~<br>~~ee~~|0.0858<br>~~ee~~<br>~~ee~~|~~ee~~<br>~~ee~~|0.0945<br>~~ee~~<br>~~ee~~|
|A1<br>~~a~~<br>~~a~~|0.9<br>~~a~~<br>~~ee~~|~~ee ~~<br>~~ee~~|1.10<br> ~~ee ~~<br>~~ee~~|0.0354<br> ~~ee ~~<br>~~ee~~|~~ee ~~<br>~~ee~~|0.0433<br> ~~ee~~<br>~~ee~~|
|A2<br>~~a~~<br>~~PR~~|0.03<br>~~a~~||0.23|0.0012||0.0091|
|b<br>~~PR~~<br>~~PR~~|0.64<br>~~a~~<br>~~a~~|~~ee~~|0.90<br>~~ee~~|0.0252||0.0354|
|b4<br>~~PR ~~<br>~~PR~~|4.95<br> ~~a~~<br>~~a~~|~~ee~~|5.46<br>~~ee~~|0.1949||0.2150|
|c<br>~~PR ~~<br>~~aa~~|0.46<br> ~~a ~~<br>~~aa~~|~~ee~~<br>~~aa~~|0.61<br>~~ee~~|0.0181||0.0236|
|c2<br>~~aa~~<br>~~a~~|0.46<br>~~aa~~<br>~~a~~|~~aa~~|0.60|0.0181||0.0236|
|D<br>~~a~~<br>~~a~~|5.97<br>~~a~~<br>~~a~~||6.22|0.2350||0.2449|
|D1<br>~~a~~|4.95<br>~~a~~||5.60|0.1949||0.2205|
|E<br>~~a~~<br>~~PR~~|6.35<br>~~a~~<br>~~a~~||6.73|0.2500||0.2650|
|E1<br>~~PR~~<br>~~PR~~|4.32<br>~~a~~<br>||5.50|0.1701||0.2165|
|e<br>~~PR ~~<br>~~PR~~|~~a~~<br>|2.286<br>|||0.0900||
|e1<br>~~PRaa~~|4.40<br>~~aa~~|~~aa~~|4.70|0.1732||0.1850|
|H<br>~~a~~|9.35<br>~~a~~||10.40|0.3681||0.4094|
|L<br>~~a~~|1.0<br>~~a~~||1.78|0.0394||0.0701|
|L2<br>~~a~~<br>~~PR~~|~~a~~<br>~~a~~||1.27|||0.0500|
|L4<br>~~PR~~<br>~~a~~|0.6<br>~~a~~<br>~~a~~|~~a~~|1.02<br>~~ee~~|0.0236<br>~~ee~~|~~ee~~|0.0402|
|V2<br>~~PR ~~<br>~~a~~|-8°<br> ~~a~~<br>~~a~~|~~a~~|+8°<br>~~ee~~|-8°<br>~~ee~~|~~ee~~|+8°|
## **Figure 21. Footprint (dimensions in mm)**
12/17 DocID9469 Rev 4 ~~>~~
**ACS120**
**Package information**
## **3.3 TO-220AB package information**
## **Figure 22. TO-220AB package outline**
**==> picture [347 x 9] intentionally omitted <==**
**----- Start of picture text -----**<br>
1. Resin gate position accepted in each of the two position as well as the symmetrical opposites.<br>**----- End of picture text -----**<br>
13/17
DocID9469 Rev 4
**ACS120**
**Package information**
## **Table 8. TO-220AB package mechanical data**
||**Table 8. TO-220ABpackage mechanical data**|**Table 8. TO-220ABpackage mechanical data**|**Table 8. TO-220ABpackage mechanical data**|**Table 8. TO-220ABpackage mechanical data**|
|---|---|---|---|---|
|**Ref.**|**Dimensions**||||
||**Millimeters**||**Inches(1)**||
||**Min.**|**Max.**|**Min.**|**Max.**|
|A|4.40|4.60|0.1732|0.1811|
|b|0.61|0.88|0.0240|0.0346|
|b1|1.14|1.70|0.0449|0.0669|
|c|0.48|0.70|0.0189|0.0276|
|D|15.25|15.75|0.6004|0.6201|
|D1|1.27 typ.||0.05 typ.||
|E|10.00|10.40|0.3937|0.4094|
|e|2.40|2.70|0.0945|0.1063|
|e1|4.95|5.15|0.1949|0.2028|
|F|1.23|1.32|0.0484|0.0520|
|H1|6.20|6.60|0.2441|0.2598|
|J1|2.40|2.72|0.0945|0.1071|
|L|13.00|14.00|0.5118|0.5512|
|L1|3.50|3.93|0.1378|0.1547|
|L20|16.40 typ.||0.6457 typ.||
|L30|28.90 typ.||1.1378 typ.||
|P|3.75|3.85|0.1476|0.1516|
|Q|2.65|2.95|0.1043|0.1161|
1. Inches only for reference.
14/17
DocID9469 Rev 4
**ACS120**
**Ordering information**
## **4 Ordering information**
## **Figure 23. Ordering information scheme**
**Table 9. Ordering information**
|**Order code**|**Marking**|**Package**|**Weight**|**Base Qty**|**Packing mode**|
|---|---|---|---|---|---|
|ACS120-7SB|ACS1207S|DPAK|0.32 g|75|Tube|
|ACS120-7SB-TR|ACS1207S|DPAK|0.32 g|2500|Tape and reel|
|ACS120-7SFP|ACS1207S|TO-220FPAB|1.9 g|50|Tube|
|ACS120-7ST|ACS1207S|TO-220AB|1.9 g|50|Tube|
15/17
DocID9469 Rev 4
**ACS120**
**Revision history**
## **5 Revision history**
**Table 10. Document revision history**
|**Date**|**Revision**|**Changes**|
|---|---|---|
|Apr-2004|1|Previous release.|
|28-Jan-2011|2|Added ECOPACK statement. Updated TCvalues in Table 1.|
|28-May-2014|3|Updated DPAK package information and reformatted to current<br>standard.|
|02-May-2016|4|Added pin name on cover page package view and reformatted to<br>current standard.|
16/17
DocID9469 Rev 4
**ACS120**
## **IMPORTANT NOTICE – PLEASE READ CAREFULLY**
STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners.
Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
© 2016 STMicroelectronics – All rights reserved
17/17
DocID9469 Rev 4
Updated at April 26, 2026
STMicroelectronics is a global leader in the semiconductor industry, recognized for developing highly integrated, energy-efficient solutions that power modern electronics. With a strong focus on innovation, ST provides a comprehensive portfolio of microelectronics that address the demanding requirements of industrial, automotive, communications, and consumer applications. Our extensive selection of STMicroelectronics components is built around a robust lineup of discrete semiconductors and circuit protection devices. We offer a wide variety of single MOSFETs, Schottky diodes, and fast and ultrafast recovery rectifier diodes, designed to deliver exceptional efficiency and thermal performance in power management and conversion systems. For robust circuit protection, our inventory features hundreds of transient voltage suppressors and TVS diodes that safeguard sensitive electronic components against destructive voltage spikes. In addition to core power discretes like TRIACs, SCRs, bipolar transistors, and single IGBTs, our STMicroelectronics range includes specialized integrated passive filters and MEMS sensors. Furthermore, ST offers advanced integrated passive devices, such as baluns and RF filters, which utilize high-quality monolithic RF IPD processes on glass or high-resistance silicon substrates. These components provide competitive cost structures, reduced power losses, and simplified RFIC-to-antenna matching, ensuring optimal system performance and delivering the reliability required for next-generation wireless and power designs.
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