# BC847CW

**MSKSEMI** · Bipolar (BJT) · SOT-323

BC847CW from MSKSEMI, 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 | BASE | input | Base terminal of the NPN transistor; the BC847CW is marked 1G, and the datasheet gives an emitter-base voltage of 6 V for the BC847W. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet gives a continuous collector current of 0.1 A and a collector power dissipation of 150 mW for the device. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet gives a collector-emitter voltage of 45 V and a collector-base voltage of 50 V for the BC847W. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-323 |
| 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 (BC847W) | VCBO |  |  | 50 | V | BC847W variant | 2 |
| Collector-emitter voltage (BC847W) | VCEO |  |  | 45 | V | BC847W variant | 2 |
| Emitter-base voltage (BC847W) | VEBO |  |  | 6 | V | BC847W variant | 2 |
| Collector current, continuous | IC |  |  | 0.1 | A | continuous | 2 |
| Collector power dissipation | PC |  |  | 150 | mW |  | 2 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | °C |  | 2 |
| Thermal resistance, junction to ambient | RθJA |  | 833 |  | °C/W | junction to ambient | 2 |
| Collector-base breakdown voltage (BC847W) | VCBO | 50 |  |  | V | IC= 10µA, IE=0 | 3 |
| Collector-emitter breakdown voltage (BC847W) | VCEO | 45 |  |  | V | IC= 10mA, IB=0 | 3 |
| Emitter-base breakdown voltage (BC847W) | VEBO | 6 |  |  | V | IE= 1 µA, IC=0 | 3 |
| Collector cutoff current | ICBO |  |  | 15 | nA | VCB=30V | 3 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.25 | V | IC=10mA, IB=0.5mA | 3 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.6 | V | IC=100mA, IB=5mA | 3 |
| Base-emitter voltage | VBE(on) | 580 | 660 | 700 | mV | VCE= 5V, IC= 2mA | 3 |
| Base-emitter voltage | VBE(on) |  |  | 770 | mV | VCE= 5V, IC= 10mA | 3 |
| Noise figure (BC847CW) | NF |  |  | 4 | dB | VCE=5V, Ic=0.2mA, f=1KHz, RS=2KΩ, BW=200Hz | 3 |
| Collector output capacitance | Cob |  |  | 4.5 | pF | VCB=10V, f=1MHz | 3 |
| Transition frequency | fT |  | 100 |  | MHz | VCE= 5 V, IC= 10mA, f=100MHz | 3 |

## CAD (KiCad official)

- Symbol: `BC847CW`
- Footprint: `Package_TO_SOT_SMD:SOT-323_SC-70`
- 3D model: SOT-323 (KiCad packages3D, STEP)
- 3D model files: `bc847cw-etched.step` / `bc847cw-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc847cw.step` / `bc847cw.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590452379801198592) (6 pp, sha256 `d72daf052b822cd3`, retrieved 2026-10-17, 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/bc847cw-datasheet.pdf)