# BCX53

**TWGMC** · Bipolar (BJT) · SOT-89

BCX53 from TWGMC, in a SOT-89. 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 BCX53 PNP transistor; the device is rated for VEBO -5 V and IC -1 A, with collector power dissipation of 500 mW. |
| 2 | COLLECTOR | passive | Collector terminal of the BCX53; the datasheet rates it at VCBO -100 V and VCEO -80 V, with collector current -1 A and collector power dissipation 500 mW. |
| 3 | EMITTER | passive | Emitter terminal of the BCX53; the datasheet rates it at VEBO -5 V, with collector current -1 A and collector power dissipation 500 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| Package | SOT-89 |
| 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 Voltage (BCX53) | VCBO |  |  | -100 | V |  | 1 |
| Collector-Emitter Voltage (BCX53) | VCEO |  |  | -80 | V |  | 1 |
| Emitter-Base Voltage | VEBO |  |  | -5 | V |  | 1 |
| Collector Current | IC |  |  | -1 | A |  | 1 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance From Junction To Ambient | RθJA |  |  | 250 | ℃/W |  | 1 |
| Collector-base breakdown voltage (BCX53) | V(BR)CBO | -100 |  |  | V | IC=-100µA,IE=0 | 2 |
| Collector-emitter breakdown voltage (BCX53) | V(BR)CEO | -80 |  |  | V | IC=-10mA,IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-100µA,IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | -0.1 | µA | VCB=-30V,IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | -0.1 | µA | VEB=-5V,IC=0 | 2 |
| DC current gain hFE(1) | hFE(1) | 63 |  |  |  | VCE=-2V, IC=-5mA | 2 |
| DC current gain hFE(2) | hFE(2) | 63 |  | 250 |  | VCE=-2V, IC=-150mA | 2 |
| DC current gain hFE(3) | hFE(3) | 40 |  |  |  | VCE=-2V, IC=-0.5A | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.5 | V | IC=-0.5A,IB=-50mA | 2 |
| Base-emitter voltage | VBE |  |  | -1 | V | VCE=-2V, IC=-0.5A | 2 |
| Transition frequency | fT | 50 |  |  | MHz | VCE=-5V,IC=-10mA, f=100MHz | 2 |

## CAD (KiCad official)

- Symbol: `BCX53`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `bcx53-etched.step` / `bcx53-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcx53.step` / `bcx53.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TWGMC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590458335657947136) (3 pp, sha256 `ca41e67301f82321`, 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/bcx53-datasheet.pdf)