# BCP54-10

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

BCP54-10 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, rated for continuous base current of 100 mA and peak pulse base current of 200 mA. |
| 2 | COLLECTOR | passive | Collector terminal, rated for continuous collector current of 1 A and peak pulse collector current of 2 A, with collector power dissipation of 1.5 W. |
| 3 | EMITTER | passive | Emitter terminal, with emitter-base voltage rating of 5 V. |

## 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 (BCP54) | V(BR)CBO | 45 |  |  | V | IC= 0.1mA,IE=0 | 1 |
| Collector-emitter breakdown voltage (BCP54) | V(BR)CEO | 45 |  |  | 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) | hFE(2) | 63 |  | 250 |  | VCE= 2V, IC=150mA | 1 |
| DC current gain hFE(2) classification range, rank BCP54-10 | hFE(2) | 63 |  | 160 |  | Rank BCP54-10 (range 63-160) | 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 (BCP54) | VCBO |  |  | 45 | V |  | 1 |
| Collector-emitter voltage (BCP54) | VCEO |  |  | 45 | V |  | 1 |
| Emitter-base voltage | VEBO |  |  | 5 | V |  | 1 |
| Collector current, continuous | IC |  |  | 1 | A |  | 1 |
| Peak pulse collector current | ICM |  |  | 2 | A |  | 1 |
| Base current, continuous | IB |  |  | 100 | mA |  | 1 |
| Peak pulse base current | IBM |  |  | 200 | mA |  | 1 |
| Collector power dissipation | PC |  |  | 1.5 | W | Ta=25℃ | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 83.3 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BCP54-10`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `bcp54-10-etched.step` / `bcp54-10-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcp54-10.step` / `bcp54-10.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/8600637124752252928) (4 pp, sha256 `ed0ce0f4210b3312`, 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/bcp54-10-datasheet.pdf)