# BC847A RFG

**Taiwan Semiconductor(Taiwan Semicon)** · Bipolar Transistors - BJT · SOT-23

BC847A RFG from Taiwan Semiconductor(Taiwan 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 NPN transistor; for BC847 the emitter-base breakdown voltage is 6 V min and the emitter-base voltage rating is 6 V. |
| 2 | Emitter | passive | Emitter terminal of the NPN transistor, the reference for the VCEO of 45 V and VEBO of 6 V ratings of the BC847. |
| 3 | Collector | passive | Collector terminal of the NPN transistor; BC847 collector current is rated 0.1 A, VCEO 45 V, VCBO 50 V, and power dissipation 200 mW. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Taiwan Semiconductor(Taiwan Semicon) |
| Package | SOT-23 |
| 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 |  |  | 50 | V | BC847 | 1 |
| Collector-Emitter Voltage | VCEO |  |  | 45 | V | BC847 | 1 |
| Emitter-Base Voltage | VEBO |  |  | 6 | V | BC847 | 1 |
| Collector Current | IC |  |  | 0.1 | A |  | 1 |
| Power dissipation | PD |  |  | 200 | mW |  | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Collector-Base Breakdown Voltage | V(BR)CBO | 50 |  |  | V | IC= 10μA IE= 0, BC847 | 1 |
| Collector-Emitter Breakdown Voltage | V(BR)CEO | 45 |  |  | V | IC= 10mA IB= 0, BC847 | 1 |
| Emitter-Base Breakdown Voltage | V(BR)EBO | 6 |  |  | V | IE= 1μA IC= 0, BC847 | 1 |
| Collector Cut-off Current | ICBO |  |  | 100 | nA | VCB= 30V IE= 0 | 1 |
| Emitter Cut-off Current | IEBO |  |  | 0.1 | μA | VEB= 5 V IC=0 | 1 |
| DC Current Gain (BC847A) | hFE | 110 |  | 220 |  | VCE= 5V IC= 2mA | 1 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  |  | 0.5 | V | IC= 100mA IB= 5mA | 1 |
| Base-Emitter Saturation Voltage | VBE(sat) |  |  | 1.1 | V | IC= 100mA IB= 5mA | 1 |
| Transition frequency | fT | 100 |  |  | MHz | VCE= 5V IC= 10 mA f= 100MHz | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts |  | tin | - Matte Tin(Sn) lead finish with Nickel(Ni) under plate - Pb free and RoHS compliant | 1 |

## CAD (KiCad official)

- Symbol: `BC847A RFG`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bc847a-rfg-etched.step` / `bc847a-rfg-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc847a-rfg.step` / `bc847a-rfg.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Taiwan Semiconductor(Taiwan Semicon) datasheet](docs/bc847a-rfg-datasheet.pdf) (4 pp, sha256 `5d0929d1f7b9c16c`, retrieved 2026-10-31, 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/bc847a-rfg-datasheet.pdf)