# BC857BM

**Nexperia** · Bipolar (BJT) · SOT-883

BC857BM from Nexperia, in a SOT-883. 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 | passive | Base terminal of the BC857BM PNP general purpose transistor; the datasheet gives no pin-specific limit, and the device peak base current IBM is rated at −100 mA on page 4. |
| 2 | emitter | passive | Emitter terminal of the BC857BM PNP general purpose transistor, carrying the emitter current of the device. |
| 3 | collector | passive | Collector terminal of the BC857BM PNP general purpose transistor; collector current is limited to −100 mA DC and −200 mA peak per the quick reference data. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-883 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `BC857BM`
- Footprint: `Package_TO_SOT_SMD:SOT-883`
- 3D model: SOT-883, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.45 mm nominal SOT height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `bc857bm-etched.step` / `bc857bm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc857bm.step` / `bc857bm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588913599956070400) (11 pp, sha256 `d21cc1150021712e`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (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/bc857bm-datasheet.pdf)