# BCP54

**Shikues** · Bipolar (BJT) · SOT-223

BCP54 from Shikues, 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 | B | input | Base of the NPN transistor; Emitter-Base voltage limit is 5 V and peak base current is 0.2 A. |
| 2 | C | passive | Collector of the NPN transistor; continuous collector current is 1 A (peak 1.5 A), with VCEO of 45 V (BCP54), 60 V (BCP55) or 80 V (BCP56). |
| 3 | E | passive | Emitter of the NPN transistor, normally connected to the lowest potential in the circuit. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shikues |
| 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-Emitter cut-off current | ICBO |  |  | 100 | nA | VCE=30V, IE=0 | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=500mA, IB=50mA | 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 Collector Current | ICM |  |  | 1.5 | A |  | 1 |
| Peak Base Current | IBM |  |  | 0.2 | A |  | 1 |
| Total power consumption | Ptot |  |  | 1.33 | W |  | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -65 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to environment | Rth(j-a) |  | 95 |  | K/W |  | 1 |
| Thermal resistance from junction to solder point | Rth(j-s) |  | 13 |  | K/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BCP54`
- Footprint: `Package_TO_SOT_SMD:SOT-223-3_TabPin2`
- 3D model: SOT-223 (KiCad packages3D, STEP)
- 3D model files: `bcp54-etched.step` / `bcp54-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcp54.step` / `bcp54.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shikues datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757068930425348096) (3 pp, sha256 `2e4ad5b250f4fe66`, retrieved 2026-10-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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-datasheet.pdf)