# FQA40N25

**onsemi** · MOSFETs · TO-3P

FQA40N25 from onsemi, in a TO-3P. 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; controls the channel, with VGS rated ±30 V max and threshold of 3.0 V to 5.0 V. |
| 2 | D | passive | Drain; 250 V max drain-source voltage and 40 A continuous drain current at TC = 25°C. |
| 3 | S | passive | Source; connected to the body diode anode, with 40 A max continuous diode forward current. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-3P |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `FQA40N25`
- Footprint: `Package_TO_SOT_THT:TO-3P-3_Vertical`
- 3D model: TO-3P (KiCad packages3D, STEP)
- 3D model files: `fqa40n25-etched.step` / `fqa40n25-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fqa40n25.step` / `fqa40n25.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588897145143906304) (8 pp, sha256 `6960bcf604866155`, retrieved 2026-11-06, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/fqa40n25-datasheet.pdf)