# BC856

**HT Shenzhen Jinyu Semicon** · Bipolar Transistors - BJT · SOT-23

BC856 from HT Shenzhen Jinyu Semicon, in a SOT-23. 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 | input | Base terminal of the PNP transistor; the device is rated for a collector current of -0.1 A continuous and an emitter-base voltage of -5 V (VEBO). |
| 2 | EMITTER | passive | Emitter terminal; the total collector power dissipation is rated at 200 mW and the junction temperature at 150 ℃ maximum. |
| 3 | COLLECTOR | passive | Collector terminal; the collector-base voltage is -80 V (BC856), -50 V (BC857) or -30 V (BC858), and the collector-emitter voltage is -65 V (BC856), -45 V (BC857) or -30 V (BC858). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | HT Shenzhen Jinyu Semicon |
| Package | SOT-23 |
| Category | Triode/MOS Tube/Transistor |
| 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 breakdown voltage (BC856) | VCEO | -65 |  |  | V | IC= -10mA, IB=0 | 2 |
| Collector-base breakdown voltage (BC856) | VCBO | -80 |  |  | V | IC= -10μA, IE=0 | 2 |
| Emitter-base breakdown voltage | VEBO | -5 |  |  | V | IE= -1μA, IC=0 | 2 |
| Collector cut-off current (BC856) | ICBO |  |  | -0.1 | μA | VCB= -70 V, IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | -0.1 | μA | VEB= -5 V, IC=0 | 2 |
| DC current gain (BC856A) | hFE | 125 |  | 250 |  | VCE= -5V, IC= -2mA | 2 |
| DC current gain (BC856B) | hFE | 220 |  | 475 |  | VCE= -5V, IC= -2mA | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.5 | V | IC=-100mA, IB= -5 mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | -1.1 | V | IC= -100mA, IB= -5mA | 2 |
| Transition frequency | fT | 100 |  |  | MHz | VCE= -5 V, IC= -10mA, f=100MHz | 2 |
| Collector capacitance | Cob |  |  | 4.5 | pF | VCB=-10V, f=1MHz | 2 |
| Collector-base voltage (BC856) | VCBO | -80 |  |  | V |  | 1 |
| Collector-emitter voltage (BC856) | VCEO | -65 |  |  | V |  | 1 |
| Emitter-base voltage | VEBO | -5 |  |  | V |  | 1 |
| Collector current, continuous | IC | -0.1 |  |  | A |  | 1 |
| Collector power dissipation | PC |  |  | 200 | mW | TA=25℃ | 1 |
| Junction temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage temperature | Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BC856`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bc856-etched.step` / `bc856-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc856.step` / `bc856.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HT Shenzhen Jinyu Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588916162147467264) (5 pp, sha256 `4399493a16bd9085`, retrieved 2026-10-10, 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/bc856-datasheet.pdf)