# FJT44

**WEIDA** · Bipolar (BJT) · SOT-223-4

FJT44 from WEIDA, in a SOT-223-4. 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 | Base | input | Base terminal of the NPN transistor, with VEBO max 6 V and a DC current gain hFE of 50 min to 200 max at VCE=10V, IC=10mA. |
| 2 | Collector | passive | Collector terminal, connected to pin 4 (tab), rated VCEO 400 V, VCBO 500 V and IC max 300 mA. |
| 3 | Emitter | passive | Emitter terminal of the NPN transistor, with emitter-base breakdown voltage BVEB of 6 V min at IE=100µA. |
| 4 | Collector | passive | Collector tab, connected to pin 2, with power dissipation of 2 W at TC=25℃ and thermal resistance junction-to-ambient of 62.5 ℃/W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | WEIDA |
| Package | SOT-223-4 |
| Category | Transistors/Thyristors |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `FJT44`
- Footprint: `Package_TO_SOT_SMD:SOT-223`
- 3D model: SOT-223-4 (KiCad packages3D, STEP)
- 3D model files: `fjt44-etched.step` / `fjt44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fjt44.step` / `fjt44.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WEIDA datasheet](docs/fjt44-datasheet.pdf) (4 pp, sha256 `4854b6c7361c85aa`, retrieved 2026-10-27, 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/fjt44-datasheet.pdf)