# BC547

**Changjing** · Bipolar (BJT) · TO-92

BC547 from Changjing, in a TO-92. 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 | COLLECTOR | passive | Collector terminal of the BC547 NPN transistor; the datasheet gives a collector-emitter voltage of 45 V max and a continuous collector current of 0.1 A max. |
| 2 | BASE | passive | Base terminal of the BC547 NPN transistor; the datasheet gives an emitter-base voltage of 6 V max for this type. |
| 3 | EMITTER | passive | Emitter terminal of the BC547 NPN transistor; the emitter-base voltage rating is 6 V for this type. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `BC547`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `bc547-etched.step` / `bc547-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc547.step` / `bc547.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/bc547-datasheet.pdf) (5 pp, sha256 `0c1fdcdb7dd84447`, 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/bc547-datasheet.pdf)