# BCX56-16U

**ST Semtech** · Bipolar (BJT) · SOT-89

BCX56-16U from ST Semtech, 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; drives the transistor, with VEBO max 5 V and IEBO max 100 nA at VEB = 5 V. |
| 2 | C | passive | Collector; VCEO 80 V, VCBO 100 V, IC 1 A continuous and 1.5 A peak, and connected to the SOT-89 tab/mounting pad (6 cm2 collector pad gives Ptot 1.3 W). |
| 3 | E | passive | Emitter; current return terminal of the NPN transistor. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | ST Semtech |
| 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 |
|---|---|---|---|---|---|---|---|
| DC Current Gain (at VCE = 2 V, IC = 150 mA) | hFE | 100 |  | 250 |  | VCE = 2 V, IC = 150 mA | 1 |
| Collector Base Cutoff Current | ICBO |  |  | 100 | nA | VCB = 30 V | 1 |
| Emitter Base Cutoff Current | IEBO |  |  | 100 | nA | VEB = 5 V | 1 |
| Collector Base Breakdown Voltage | V(BR)CBO | 100 |  |  | V | IC = 100 µA | 1 |
| Collector Emitter Breakdown Voltage | V(BR)CEO | 80 |  |  | V | IC = 1 mA | 1 |
| Emitter Base Breakdown Voltage | V(BR)EBO | 5 |  |  | V | IE = 100 µA | 1 |
| Collector Emitter Saturation Voltage | VCE(sat) |  |  | 0.5 | V | IC = 500 mA, IB = 50 mA | 1 |
| Base Emitter Voltage | VBE |  |  | 1 | V | VCE = 2 V, IC = 500 mA | 1 |
| Transition Frequency | fT | 100 |  |  | MHz | VCE = 5 V, IC = 50 mA, f = 100 MHz | 1 |
| Collector Emitter Voltage (absolute maximum) | VCEO |  |  | 80 | V |  | 1 |
| Collector Base Voltage (absolute maximum) | VCBO |  |  | 100 | V |  | 1 |
| Emitter Base Voltage (absolute maximum) | VEBO |  |  | 5 | V |  | 1 |
| Collector Current | IC |  |  | 1 | A |  | 1 |
| Peak Collector Current | ICM |  |  | 1.5 | A |  | 1 |
| Total Power Dissipation | Ptot |  |  | 0.5 | W | Device mounted on FR4 PCB, single-sided copper, tin-plated, standard footprint (note 1) | 1 |
| Total Power Dissipation | Ptot |  |  | 1.3 | W | Device mounted on FR4 PCB, single-sided copper, tin-plated, mounting pad for collector 6 cm2 (note 2) | 1 |
| Junction Temperature | Tj |  |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BCX56-16U`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `bcx56-16u-etched.step` / `bcx56-16u-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bcx56-16u.step` / `bcx56-16u.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [ST Semtech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182417962422272) (3 pp, sha256 `5e5cbb18f054103e`, retrieved 2026-10-19, 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/bcx56-16u-datasheet.pdf)