# FS3400

**FOSAN** · MOSFETs · SOT-23-3L

FS3400 from FOSAN, 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 ±12 V maximum, with a gate threshold voltage of 0.65 V min to 1.5 V max at ID=250uA. |
| 2 | S | passive | Source; continuous drain current is rated at 5.8 A at TA=25°C and the body diode forward drop is 1.2 V max at ISD=5.6A. |
| 3 | D | passive | Drain; drain-source voltage is rated at 30 V maximum, with pulsed drain current up to 23 A. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `FS3400`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `fs3400-etched.step` / `fs3400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fs3400.step` / `fs3400.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [FOSAN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757315849101422592) (5 pp, sha256 `d85d2cb86ec6095a`, retrieved 2026-10-09, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/fs3400-datasheet.pdf)