# WD3401

**WEIDA** · MOSFETs · SOT-23-3

WD3401 from WEIDA, in a SOT-23-3. 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 limited to ±12 V, with threshold VGS(th) of -0.7 to -1.3 V at ID = -250µA. |
| 2 | S | passive | Source of the P-channel MOSFET; continuous source current IS up to -4.2 A. |
| 3 | D | passive | Drain; drain-source voltage rated -30 V with continuous drain current -4.2 A and pulsed -16 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WEIDA |
| Package | SOT-23-3 |
| 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 Breakdown Voltage | V(BR)DSS | -30 |  |  | V | VGS = 0V, ID = -250µA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | μA | VDS = -30V, VGS = 0V | 2 |
| Gate-Body Leakage Current | lGSS | -100 |  | 100 | nA | VDS = 0V, VGS = ±12V | 2 |
| Gate-Threshold Voltage | VGS(th) | -0.7 | -1 | -1.3 | V | VDS = VGS, ID = -250µA | 2 |
| Drain-Source on-Resistance | RDS(on) |  | 42 | 60 | mΩ | VGS = -10V, ID = -4.2A | 2 |
| Drain-Source on-Resistance | RDS(on) |  | 52 | 75 | mΩ | VGS = -4.5V, ID = -4A | 2 |
| Drain-Source on-Resistance | RDS(on) |  | 60 | 90 | mΩ | VGS = -2.5V, ID = -1A | 2 |
| Diode Forward Voltage | VSD |  |  | -1.2 | V | IS = -4.2A, VGS = 0V | 2 |
| Continuous Source Current | IS |  |  | -4.2 | A |  | 2 |
| Drain-Source Voltage | VDS |  |  | -30 | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -4.2 | A | TA=25°C | 1 |
| Pulsed Drain Current | IDM |  |  | -16 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.2 | W | TA=25°C | 1 |
| Operating Junction and Storage Temperature Range | TJ ,TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance from Junction to Ambient | RθJA |  | 104 |  | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `WD3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `wd3401-etched.step` / `wd3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wd3401.step` / `wd3401.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WEIDA datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603176905168605184) (5 pp, sha256 `159a2895d27816e2`, retrieved 2026-10-17, 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/wd3401-datasheet.pdf)