# WTM3400

**WPMtek Wei Pan Microelectronics** · MOSFETs · SOT-23

WTM3400 from WPMtek Wei Pan Microelectronics, in a SOT-23. 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 limit is ±12 V, with VGS(th) 0.7 V min to 1.4 V max at ID = 250 uA. |
| 2 | S | passive | Source; continuous drain current is 5.8 A and the maximum diode forward current IS is 1.6 A. |
| 3 | D | passive | Drain; drain-source voltage is 30 V, continuous drain current is 5.8 A and pulsed drain current is 30 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WPMtek Wei Pan Microelectronics |
| Package | SOT-23 |
| 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 | VDS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A |  | 1 |
| Pulsed Drain Current | IDM |  |  | 30 | A |  | 1 |
| Maximum Power Dissipation | PD |  |  | 1.4 | W | TA = 25oC | 1 |
| Maximum Power Dissipation | PD |  |  | 1 | W | TA = 75oC | 1 |
| Operating Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 150 | oC |  | 1 |
| Junction-to-Ambient Thermal Resistance | RθJA |  |  | 145 | oC/W | PCB mounted | 1 |
| Drain-Source On-State Resistance | RDS(on) |  | 22 | 30 | mΩ | VGS = 10V, ID = 5.8A | 2 |
| Drain-Source On-State Resistance | RDS(on) |  | 27 | 33 | mΩ | VGS = 4.5V, ID =5A | 2 |
| Drain-Source On-State Resistance | RDS(on) |  | 43 | 52 | mΩ | VGS = 2.5V, ID =4A | 2 |
| Gate Threshold Voltage | VGS(th) | 0.7 |  | 1.4 | V | VDS =VGS, ID = 250uA | 2 |
| Gate Body Leakage | IGSS | -100 |  | 100 | nA | VGS = ± 12V, VDS = 0V | 2 |
| Forward Transconductance | gfs | 10 |  | 15 | S | VDS = 5V, ID = 5A | 2 |
| Gate Resistance | Rg | 6 | 7 | 7.5 | Ω | F = 1.0MHz | 2 |
| Max. Diode Forward Current | IS |  |  | 1.6 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `WTM3400`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `wtm3400-etched.step` / `wtm3400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `wtm3400.step` / `wtm3400.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WPMtek Wei Pan Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757101792767692800) (4 pp, sha256 `1b5fd17bb0663164`, retrieved 2026-10-18, 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/wtm3400-datasheet.pdf)