# ACST310-8B

**STMicroelectronics** · Thyristors (SCR)/Modules · DPAK

ACST310-8B from STMicroelectronics, in a DPAK. 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 main terminal (triac anode/reference) of the AC switch; OUT is specified for both polarities referenced to this pin, with IT(RMS) 3 A at Tc = 112 °C. |
| 2 | OUT | passive | Output main terminal of the AC switch, also the metal tab, blocking VDRM/VRRM of 800 V with a minimum clamping voltage VCL of 850 V. |
| 3 | G | input | Gate trigger input driven directly by a microcontroller through a resistor, with IGT max. 10 mA and VGT max. 1.1 V in quadrants I, II and III. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | DPAK |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `ACST310-8B`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: DPAK (KiCad packages3D, STEP)
- 3D model files: `acst310-8b-etched.step` / `acst310-8b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `acst310-8b.step` / `acst310-8b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://www.st.com/resource/en/datasheet/acst310-8b.pdf) (14 pp, sha256 `256e3ca183aaac39`, retrieved 2026-10-01, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/acst310-8b-datasheet.pdf)