# BC856S

**Changjing** · Bipolar (BJT) · SOT-363

BC856S from Changjing, in a SOT-363. 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 | E1 | passive | Emitter of transistor 1 (PNP); emitter-base voltage rating -5 V. |
| 2 | B1 | passive | Base of transistor 1 (PNP). |
| 3 | C2 | passive | Collector of transistor 2 (PNP); max collector current -0.1 A continuous, collector-emitter voltage -65 V. |
| 4 | E2 | passive | Emitter of transistor 2 (PNP); emitter-base voltage rating -5 V. |
| 5 | B2 | passive | Base of transistor 2 (PNP). |
| 6 | C1 | passive | Collector of transistor 1 (PNP); max collector current -0.1 A continuous, collector-emitter voltage -65 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-363 |
| Category | Transistors/Thyristors |
| Pins | 6 |

## 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 breakdown voltage | V(BR)CBO | -80 |  |  | V | IC=-10A,IE=0 | 1 |
| Collector-emitter breakdown voltage | V(BR)CEO | -65 |  |  | V | IC=-10mA,IB=0 | 1 |
| Emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IE=-10A,IC=0 | 1 |
| Collector cut-off current | ICBO |  |  | -15 | nA | VCB=-30V,IE=0 | 1 |
| Emitter cut-off current | IEBO |  |  | -100 | nA | VEB=-5V,IC=0 | 1 |
| DC current gain | hFE | 110 |  |  |  | VCE=-5V,IC=-2mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.1 | V | IC=-10mA, IB=-0.5mA | 1 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | -0.3 | V | IC=-100mA, IB=-5mA | 1 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 0.7 | V | IC=-10mA, IB=-0.5mA | 1 |
| Output capacitance | Cobo |  |  | 2.5 | pF | VCB=-10V, f=1MHz, IE=0 | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=-5V, IC=-10mA, f=100MHz | 1 |
| Collector-base voltage |  |  |  | -80 | V |  | 1 |
| Collector-emitter voltage |  |  |  | -65 | V |  | 1 |
| Emitter-base voltage |  |  |  | -5 | V |  | 1 |
| Collector current, continuous |  |  |  | -0.1 | A |  | 1 |
| Collector power dissipation |  |  |  | 0.2 | W |  | 1 |
| Thermal resistance, junction to ambient |  |  |  | 625 | /W |  | 1 |
| Operation junction and storage temperature range | TJ,TSTG | -55 |  | 150 |  |  | 1 |

## CAD (KiCad official)

- Symbol: `BC856S`
- Footprint: `Package_TO_SOT_SMD:SOT-363_SC-70-6`
- 3D model: SOT-363 (KiCad packages3D, STEP)
- 3D model files: `bc856s-etched.step` / `bc856s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc856s.step` / `bc856s.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603047590284050432) (4 pp, sha256 `da6ea6297f0e76db`, retrieved 2026-10-17, 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/bc856s-datasheet.pdf)