# BCM857BS

**FUXINSEMI** · Bipolar (BJT) · SOT-363

BCM857BS from FUXINSEMI, in a SOT-363. 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 | E1 | passive | Emitter of PNP transistor 1; Vebo -5 V max rating, IC -0.2 A continuous per the datasheet. |
| 2 | B1 | passive | Base of PNP transistor 1; VBE -0.6 to -0.75 V at VCE=-5V, IC=-2mA. |
| 3 | C2 | passive | Collector of PNP transistor 2; VCEO -45 V and VCBO -50 V max ratings, IC -0.2 A continuous. |
| 4 | E2 | passive | Emitter of PNP transistor 2; Vebo -5 V max rating. |
| 5 | B2 | passive | Base of PNP transistor 2; VBE -0.6 to -0.75 V at VCE=-5V, IC=-2mA. |
| 6 | C1 | passive | Collector of PNP transistor 1; VCEO -45 V and VCBO -50 V max ratings, IC -0.2 A continuous. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | FUXINSEMI |
| Package | SOT-363 |
| Category | Transistors/Thyristors |
| Pins | 6 |

## CAD (KiCad official)

- Symbol: `BCM857BS`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `bcm857bs-etched.step` / `bcm857bs-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcm857bs.step` / `bcm857bs.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [FUXINSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590931192369786880) (3 pp, sha256 `4a94b2b8b1fcee8d`, retrieved 2026-10-09, 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/bcm857bs-datasheet.pdf)