# STD5NK40ZT4

**STMicroelectronics** · MOSFETs · DPAK

STD5NK40ZT4 from STMicroelectronics, in a DPAK. 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 terminal for MOSFET switching control with maximum gate-source voltage ±30V and integrated Zener diode protection. |
| 2 | Drain | passive | Drain terminal rated for maximum 400V drain-source voltage; connected to case tab for thermal dissipation path. |
| 3 | Source | power_in | Source terminal providing reference potential for gate and drain voltages; typical return path connection. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | DPAK |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `STD5NK40ZT4`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: DPAK (KiCad packages3D, STEP)
- 3D model files: `std5nk40zt4-etched.step` / `std5nk40zt4-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `std5nk40zt4.step` / `std5nk40zt4.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [STMicroelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588885409350209536) (13 pp, sha256 `471b445d2f8e7e19`, retrieved 2026-10-01, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-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/std5nk40zt4-datasheet.pdf)