# WST4045

**Winsok Semicon** · MOSFETs · SOT-23-3L

WST4045 from Winsok Semicon, in a SOT-23-3L. 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 | G | input | Gate; gate-source voltage is rated at ±20 V maximum. |
| 2 | S | passive | Source of the P-channel MOSFET; continuous drain current is rated -4.3 A. |
| 3 | D | passive | Drain; drain-source voltage is rated at -40 V maximum. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Winsok Semicon |
| Package | SOT-23-3L |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `WST4045`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `wst4045-etched.step` / `wst4045-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wst4045.step` / `wst4045.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Winsok Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917171213258752) (6 pp, sha256 `c2070dc96bd5cbde`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/wst4045-datasheet.pdf)