# BCP56-10

**Changjing** · Bipolar (BJT) · SOT-223

BCP56-10 from Changjing, 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 | passive | Base terminal of the NPN transistor; the emitter-base voltage rating VEBO is 5 V for the BCP54/55/56 family. |
| 2 | COLLECTOR | passive | Collector terminal of the NPN transistor; for BCP56 the collector-base voltage VCBO is 100 V, collector-emitter voltage VCEO is 80 V, and continuous collector current IC is 1 A. |
| 3 | EMITTER | passive | Emitter terminal of the NPN transistor, the reference for the base and collector ratings listed in the maximum ratings table. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage (BCP56) | V(BR)CBO | 100 |  |  | V | IC=0.1mA, IE=0 | 1 |
| Collector-emitter breakdown voltage (BCP56) | V(BR)CEO | 80 |  |  | V | IC=10mA, IB=0 | 1 |
| Base-emitter breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=10μA, IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | 100 | nA | VCB=30 V, IE=0 | 1 |
| DC current gain hFE(1) | hFE(1) | 25 |  |  |  | VCE=2V, IC=5mA | 1 |
| DC current gain hFE(2) (rank -10 range) | hFE(2) | 63 |  | 160 |  | VCE=2V, IC=150mA | 1 |
| DC current gain hFE(3) | hFE(3) | 25 |  |  |  | VCE=2V, IC=500mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=500mA, IB=50mA | 1 |
| Base-emitter voltage | VBE |  |  | 1 | V | VCE=2V, IC=500mA | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=10V, IC=50mA, f=100MHz | 1 |
| Collector-base voltage (BCP56) | VCBO |  |  | 100 | V | Ta=25℃ | 1 |
| Collector-emitter voltage (BCP56) | VCEO |  |  | 80 | V | Ta=25℃ | 1 |
| Emitter-base voltage | VEBO |  |  | 5 | V | Ta=25℃ | 1 |
| Collector current, continuous | IC |  |  | 1 | A |  | 1 |
| Collector power dissipation | PC |  |  | 1.5 | W | Ta=25℃ | 1 |
| Storage temperature range | Tstg | -65 |  | 150 | ℃ |  | 1 |
| Thermal resistance junction to ambient | RθJA |  | 83.3 |  | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BCP56-10`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `bcp56-10-etched.step` / `bcp56-10-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcp56-10.step` / `bcp56-10.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586199650759663616) (4 pp, sha256 `4f8918c4f4f89dcd`, retrieved 2026-10-18, 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/bcp56-10-datasheet.pdf)