# BCX53 AH HD

**Guangdong Hottech** · Bipolar (BJT) · SOT-89

BCX53 AH HD from Guangdong Hottech, 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 | B | input | Base of the PNP transistor; the SOT-89 drawing labels the left-hand lead B, and the datasheet gives VEBO as -5 V max. |
| 2 | C | passive | Collector of the PNP transistor (centre lead, internally joined to the collector tab); the datasheet gives IC of -1 A max and VCEO of -80 V for the BCX53. |
| 3 | E | passive | Emitter of the PNP transistor; the SOT-89 drawing labels the right-hand lead E. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Guangdong Hottech |
| 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 | °C |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance From Junction To Ambient | RθJA |  |  | 250 | °C/W |  | 1 |
| Collector-base breakdown voltage (BCX53) | V(BR)CBO | -100 |  |  | V | IC=-100uA, 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=-100uA, IC=0 | 2 |
| Collector cut-off current | ICBO | -0.1 |  |  | uA | VCB=-30V, IE=0 | 2 |
| Emitter cut-off current | IEBO | -0.1 |  |  | uA | VEB=-5V, IC=0 | 2 |
| DC current gain (BCX53 rank, low current) | hFE1 | 63 |  |  |  | VCE=-2V, IC=-5mA | 2 |
| DC current gain (BCX53 rank, medium current) | hFE2 | 63 |  | 250 |  | VCE=-2V, IC=-150mA | 2 |
| DC current gain (BCX53 rank, high current) | hFE3 | 40 |  |  |  | VCE=-2V, IC=-500mA | 2 |
| Collector-emitter saturation voltage | VCE(sat) | -0.5 |  |  | V | IC=-500mA, IB=-50mA | 2 |
| Base-emitter voltage | VBE | -1 |  |  | V | VCE=-2V, IC=-500mA | 2 |
| Transition frequency | fT | 50 |  |  | MHz | VCE=-5V, IC=-10mA, f=100MHz | 2 |

## CAD (KiCad official)

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

## Provenance

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

- **Datasheet:** [Guangdong Hottech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588909963066683392) (5 pp, sha256 `f505c1e3b73942ee`, 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/bcx53-ah-hd-datasheet.pdf)