# BC848

**Changjing** · Bipolar (BJT) · SOT-23

BC848 from Changjing, 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 NPN transistor; the datasheet's emitter-base voltage limit is VEBO 6 V. |
| 2 | EMITTER | passive | Emitter terminal of the NPN transistor; continuous collector current is rated at 0.1 A (IC) maximum. |
| 3 | COLLECTOR | passive | Collector terminal of the NPN transistor; collector-emitter voltage VCEO is 65 V (BC846), 45 V (BC847) or 30 V (BC848), with collector power dissipation PC 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-23 |
| 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 breakdown voltage (BC848) | VCBO | 30 |  |  | V | IC= 10µA, IE=0 | 2 |
| Collector-emitter breakdown voltage (BC848) | VCEO | 30 |  |  | V | IC= 10mA, IB=0 | 2 |
| Emitter-base breakdown voltage | VEBO | 6 |  |  | V | IE= 10µA, IC=0 | 2 |
| Collector cut-off current (BC848) | ICBO |  |  | 0.1 | μA | VCB=30 V, IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | 0.1 | μA | VEB=5 V, IC=0 | 2 |
| Collector-emitter saturation voltage | VCE(sat) |  |  | 0.5 | V | IC=100mA, IB= 5mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1.1 | V | IC=100mA, IB= 5mA | 2 |
| Collector output capacitance | Cob |  |  | 4.5 | pF | VCB=10V,f=1MHz | 2 |
| Collector-base voltage (absolute maximum, BC848) | VCBO |  |  | 30 | V | Ta=25℃ | 1 |
| Collector-emitter voltage (absolute maximum, BC848) | VCEO |  |  | 30 | V | Ta=25℃ | 1 |
| Emitter-base voltage | VEBO |  |  | 6 | V | Ta=25℃ | 1 |
| Collector current continuous | IC |  |  | 0.1 | A | Ta=25℃ | 1 |
| Collector power dissipation | PC |  |  | 200 | mW | Ta=25℃ | 1 |
| Operation junction and storage temperature range | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |
| Thermal resistance from junction to ambient | RΘJA |  |  | 625 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BC848`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bc848-etched.step` / `bc848-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc848.step` / `bc848.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/8588948189299163136) (5 pp, sha256 `8e6155ee2bd1ed7b`, retrieved 2026-10-18, 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/bc848-datasheet.pdf)