# BCP51-JSM

**JSMSEMI** · Bipolar (BJT) · SOT-223

BCP51-JSM from JSMSEMI, in a SOT-223. 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 of the PNP transistor; emitter-base voltage is limited to -5 V (VEBO) and IEBO is max -0.1 uA at VEB = -5 V. |
| 2 | COLLECTOR | passive | Collector of the PNP transistor; BCP51 is rated VCBO -45 V and VCEO -45 V, with continuous collector current of -1 A. |
| 3 | EMITTER | passive | Emitter of the PNP transistor; the part is rated for 1.5 W collector power dissipation and a 150 °C junction temperature. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SOT-223 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `BCP51-JSM`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `bcp51-jsm-etched.step` / `bcp51-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcp51-jsm.step` / `bcp51-jsm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](docs/bcp51-jsm-datasheet.pdf) (3 pp, sha256 `a6d928e19bda65bc`, retrieved 2026-11-05, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/bcp51-jsm-datasheet.pdf)