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ACS120-7ST

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STMicroelectronics Thyristors (SCR)/Modules, TO-220AB. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.

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ACS120-7ST

STMicroelectronics · Thyristors (SCR)/Modules · TO-220AB

ACS120-7ST from STMicroelectronics, in a TO-220AB. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 COM passive Common drive reference; connects to AC mains; electrically shared with mounting tab; rated VDRM/VRRM ±700 V, IT(RMS) = 2 A at TC = 119 °C, Rth(j-c) = 2.6 °C/W.
2 OUT passive Switched AC output; connects to load; VTM max 1.3 V at IOUT = 2.8 A (tp = 380 µs, TJ = 25 °C); ITSM = 20 A (tp = 20 ms); static dV/dt min 500 V/µs at TJ = 110 °C.
3 G input Gate input; triggered by negative current flowing out of pin via external resistor from MCU; IGT max 10 mA, VGT max 1 V (VOUT = 12 V DC, RL = 140 Ω, TJ = 25 °C); IGM peak 1 A (tp = 20 µs); PG(AV) max 0.1 W.
Tab COM passive Mounting tab; electrically connected to COM (pin 1); primary thermal path to heatsink; Rth(j-c) = 2.6 °C/W for TO-220AB.

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package TO-220AB
Category Transistors/Thyristors
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Repetitive peak off-state voltage VDRM/VRRM 700 V 2
On-state RMS current (TO-220AB) IT(RMS) 2 A full cycle sine wave 50 to 60 Hz, TO-220AB TC = 119 °C 2
Non repetitive surge peak on-state current ITSM 20 A TJ initial = 25 °C, full cycle sine wave, tP = 20 ms 2
Non repetitive surge peak on-state current ITSM 21 A TJ initial = 25 °C, full cycle sine wave, tP = 16.7 ms 2
Fusing capability I2t 2.6 A2s tP = 10 ms 2
Repetitive critical rate of rise of on-state current dI/dt 50 A/µs IG = 10 mA (tr < 100 ns), Tj = 125 °C, f = 120 Hz 2
Non repetitive line peak pulse voltage VPP 2 kV According to IEC 61000-4-5 (Figure 17) 2
Storage temperature range Tstg -40 150 °C 2
Operating junction temperature range TJ -30 125 °C 2
Maximum lead soldering temperature TL 260 °C during 10 s 2
Average gate power dissipation PG(AV) 0.1 W 2
Peak gate current IGM 1 A tP = 20 µs 2
Peak positive gate voltage (in respect to pin COM) VGM 5 V 2
Thermal resistance junction to ambient (TO-220AB) Rth(j-a) 60 °C/W S = 0.5 cm2 copper surface under tab 2
Thermal resistance junction to case (TO-220AB) Rth(j-c) 2.6 °C/W 2
Triggering gate current IGT 10 mA VOUT = 12 V (DC), RL = 140 Ω, QII-QIII, TJ = 25 °C 3
Triggering gate voltage VGT 1 V VOUT = 12 V (DC), RL = 140 Ω, QII-QIII, TJ = 25 °C 3
Non-triggering gate voltage VGD 0.15 V VOUT = VDRM, RL = 3.3 kΩ, TJ = 125 °C 3
Holding current IH 45 mA IOUT = 100 mA, gate open, TJ = 25 °C 3
Latching current IL 65 mA IG = 20 mA, TJ = 25 °C 3
Peak on-state voltage drop VTM 1.3 V IOUT = 2.8 A, tp = 380 µs, TJ = 25 °C 3
On-state threshold voltage VTO 0.85 V TJ = 125 °C 3
On-state dynamic resistance Rd 200 mΩ TJ = 125 °C 3
Maximum forward or reverse leakage current IDRM /IRRM 2 µA VOUT = 700 V, TJ = 25 °C 3
Maximum forward or reverse leakage current IDRM /IRRM 200 µA VOUT = 700 V, TJ = 125 °C 3
Critical rate of rise of off-state voltage dV/dt 500 V/µs VOUT = 460 V, gate open, TJ = 110 °C 3
Critical rate of decrease of commutating on-state current (dI/dt)c 1 A/ms (dV/dt)c = 20 V/µs, TJ = 125 °C 3
Clamping voltage VCL 1100 V ICL = 1 mA, tp = 1 ms, TJ = 25 °C 3

CAD (KiCad official)

  • Symbol: ACS120-7ST
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220AB (KiCad packages3D, STEP)
  • 3D model files: acs120-7st-etched.step / acs120-7st-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); acs120-7st.step / acs120-7st.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (17 pp, sha256 e12d832a3bfd5588, retrieved 2026-10-21, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF