# BC856W

**Nexperia** · Bipolar Transistors - BJT · SOT-323

BC856W from Nexperia, in a SOT-323. 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 terminal of the PNP transistor (Table 3 pinning, graphic symbol B); the datasheet gives no separate electrical limit for this pin, so the Table 6 limiting values apply to the device. |
| 2 | E | passive | Emitter terminal of the PNP transistor (Table 3 pinning, graphic symbol E); the datasheet gives no separate electrical limit for this pin, so the Table 6 limiting values apply to the device. |
| 3 | C | passive | Collector terminal of the PNP transistor (Table 3 pinning, graphic symbol C); the datasheet gives no separate electrical limit for this pin, so the Table 6 limiting values apply to the device. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-323 |
| Category | Transistors |
| 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 | VCBO |  |  | -80 | V | open emitter | 3 |
| collector-emitter voltage | VCEO |  |  | -65 | V | open base | 3 |
| emitter-base voltage | VEBO |  |  | -5 | V | open collector | 3 |
| collector current | IC |  |  | -100 | mA |  | 3 |
| peak collector current | ICM |  |  | -200 | mA |  | 3 |
| peak base current | IBM |  |  | -200 | mA |  | 3 |
| total power dissipation | Ptot |  |  | 200 | mW | Tamb ≤ 25 °C [1] | 3 |
| junction temperature | Tj |  |  | 150 | °C |  | 3 |
| ambient temperature | Tamb | -65 |  | 150 | °C |  | 3 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| thermal resistance from junction to ambient | Rth(j-a) |  |  | 625 | K/W | in free air [1] | 4 |
| collector-base breakdown voltage | V(BR)CBO | -80 |  |  | V | IC = -100 µA; IE = 0 A | 5 |
| collector-emitter breakdown voltage | V(BR)CEO | -65 |  |  | V | IC = -2 mA; IB = 0 A | 5 |
| emitter-base breakdown voltage | V(BR)EBO | -5 |  |  | V | IC = 0 A; IE = -100 µA | 5 |
| collector-base cut-off current | ICBO |  | -1 | -15 | nA | VCB = -30 V; IE = 0 A | 5 |
| collector-base cut-off current | ICBO |  |  | -4 | µA | VCB = -30 V; IE = 0 A; Tj = 150 °C | 5 |
| emitter-base cut-off current | IEBO |  |  | -100 | nA | VEB = -5 V; IC = 0 A | 5 |
| DC current gain | hFE | 125 |  | 475 |  | VCE = -5 V; IC = -2 mA | 5 |
| collector-emitter saturation voltage | VCEsat |  | -75 | -300 | mV | IC = -10 mA; IB = -0.5 mA | 5 |
| collector-emitter saturation voltage | VCEsat |  | -250 | -600 | mV | IC = -100 mA; IB = -5 mA [1] | 5 |
| base-emitter voltage | VBE | -600 | -650 | -750 | mV | VCE = -5 V; IC = -2 mA | 5 |
| base-emitter voltage | VBE |  |  | -820 | mV | VCE = -5 V; IC = -10 mA | 5 |
| transition frequency | fT | 100 |  |  | MHz | VCE = -5 V; IC = -10 mA; f = 100 MHz | 5 |
| noise figure | NF |  | 2 | 10 | dB | IC = -200 µA; VCE = -5 V; RS = 2 kΩ; f = 1 kHz; B = 200Hz | 5 |

## CAD (KiCad official)

- Symbol: `BC856W`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `bc856w-etched.step` / `bc856w-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc856w.step` / `bc856w.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BC856W.pdf) (13 pp, sha256 `6ecc839c70f13953`, retrieved 2026-11-04, tier: manufacturer)
- **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/bc856w-datasheet.pdf)