# STP40NF10

**STMicroelectronics** · MOSFETs · TO-220

STP40NF10 from STMicroelectronics, in a TO-220. 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 | Gate | input | Control input terminal rated ±20V maximum with gate threshold voltage of 2-4V at VDS=VGS and ID=250µA |
| 2 | Drain | passive | Main drain terminal rated 100V maximum for VDS and supporting continuous drain current of 50A at 25°C case temperature |
| 3 | Source | passive | Source terminal providing return path for drain current and including integrated source-drain diode with forward voltage of 1.5V at 50A |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `STP40NF10`
- Footprint: `Package_TO_SOT_THT:TO-220-3_Vertical`
- 3D model: TO-220 (KiCad packages3D, STEP)
- 3D model files: `stp40nf10-etched.step` / `stp40nf10-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `stp40nf10.step` / `stp40nf10.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/stp40nf10.pdf) (12 pp, sha256 `53b7412da93d969f`, retrieved 2026-10-05, 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/stp40nf10-datasheet.pdf)