# BCX71J

**Nexperia** · Bipolar (BJT) · SOT-23

BCX71J from Nexperia, in a SOT-23. 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 | B | passive | Base terminal of the PNP transistor, shown as B on the graphic symbol; the datasheet gives no per-pin voltage or current limit for it. |
| 2 | E | passive | Emitter terminal of the PNP transistor, shown as E on the graphic symbol; the datasheet gives no per-pin voltage or current limit for it. |
| 3 | C | passive | Collector terminal of the PNP transistor, shown as C on the graphic symbol; the collector current limit is -100 mA (IC) and collector-emitter voltage is -45 V (VCEO) per the limiting values. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `BCX71J`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bcx71j-etched.step` / `bcx71j-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcx71j.step` / `bcx71j.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BCX71J.pdf) (8 pp, sha256 `863138e43bc78e08`, retrieved 2026-10-09, tier: manufacturer)
- **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/bcx71j-datasheet.pdf)