# FS3401

**FOSAN** · MOSFETs · SOT-23-3L

FS3401 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 | GATE | input | Gate of the P-channel MOSFET, with gate-source voltage limited to ±12 V and a threshold of -0.6 V to -2 V at ID = -250 uA. |
| 2 | SOURCE | passive | Source of the P-channel MOSFET, with continuous drain current rated at -4.5 A and pulsed drain current at -20 A. |
| 3 | DRAIN | passive | Drain of the P-channel MOSFET, with drain-source voltage rated at -30 V and on-resistance of 46 mΩ max at VGS = -10 V, ID = -4.2 A. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Drain-Source Voltage | BVDSS |  |  | -30 | V |  | 1 |
| Gate-Source Voltage | VGS |  |  | 12 | V |  | 1 |
| Drain Current (continuous) | ID |  |  | -4.5 | A |  | 1 |
| Drain Current (pulsed) | IDM |  |  | -20 | A |  | 1 |
| Total Device Dissipation | PD |  |  | 1500 | mW | TA=25℃ | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | -30 |  |  | V | ID = -250uA, VGS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | -0.6 |  | -2 | V | ID = -250uA, VGS= VDS | 2 |
| Diode Forward Voltage Drop | VSD |  |  | -1 | V | IS= -1A, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | uA | VGS=0V, VDS= -24V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -5 | uA | VGS=0V, VDS= -24V, TA=55℃ | 2 |
| Gate Body Leakage | IGSS |  |  | 100 | nA | VGS=+12V, VDS=0V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 40 | 46 | mΩ | ID= -4.2A, VGS= -10V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 50 | 58 | mΩ | ID= -2A, VGS= -4.5V | 2 |
| Static Drain-Source On-State Resistance | RDS(ON) |  | 80 | 85 | mΩ | ID= -1A, VGS= -2.5V | 2 |

## CAD (KiCad official)

- Symbol: `FS3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `fs3401-etched.step` / `fs3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fs3401.step` / `fs3401.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/8588946110026670080) (3 pp, sha256 `3b814a3ce878f42c`, retrieved 2026-10-18, 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/fs3401-datasheet.pdf)