# BC546BTF

**onsemi** · Bipolar Transistors - BJT · TO-92-3

BC546BTF from onsemi, in a TO-92-3. 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 | Collector | passive | Collector of the NPN transistor; the datasheet rates collector current (DC) at 100 mA maximum and collector-base voltage at 80 V for BC546. |
| 2 | Base | passive | Base of the NPN transistor; the datasheet rates emitter-base voltage at 6 V for BC546 (BC546/BC547) and 5 V for BC548/BC549/BC550. |
| 3 | Emitter | passive | Emitter of the NPN transistor; the datasheet's absolute maximum ratings limit it through the emitter-base voltage (6 V for BC546, 5 V for BC548/BC549/BC550) and junction temperature of 150 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-92-3 |
| 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 (BC546) | VCBO |  |  | 80 | V |  | 3 |
| Collector-Emitter Voltage (BC546) | VCEO |  |  | 65 | V |  | 3 |
| Emitter-Base Voltage (BC546/BC547) | VEBO |  |  | 6 | V |  | 3 |
| Collector Current (DC) | IC |  |  | 100 | mA |  | 3 |
| Collector Power Dissipation | PC |  |  | 500 | mW |  | 3 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 3 |
| Storage Temperature Range | TSTG | -65 |  | 150 | °C |  | 3 |
| Collector Cut-Off Current | ICBO |  |  | 15 | nA | VCB = 30 V, IE = 0 | 3 |
| DC Current Gain | hFE | 110 |  | 800 |  | VCE = 5 V, IC = 2 mA | 3 |
| DC Current Gain (classification B) | hFE | 200 |  | 450 |  |  | 3 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  | 90 | 250 | mV | IC = 10 mA, IB = 0.5 mA | 3 |
| Collector-Emitter Saturation Voltage | VCE(sat) |  | 250 | 600 | mV | IC = 100 mA, IB = 5 mA | 3 |
| Base-Emitter Saturation Voltage | VBE(sat) |  |  | 700 | mV | IC = 10 mA, IB = 0.5 mA | 3 |
| Base-Emitter Saturation Voltage | VBE(sat) |  |  | 900 | mV | IC = 100 mA, IB = 5 mA | 3 |
| Base-Emitter On Voltage | VBE(on) | 580 | 660 | 700 | mV | VCE = 5 V, IC = 2 mA | 3 |
| Base-Emitter On Voltage | VBE(on) |  |  | 720 | mV | VCE = 5 V, IC = 10 mA | 3 |
| Current Gain Bandwidth Product | fT |  | 300 |  | MHz | VCE = 5 V, IC = 10 mA, f = 100 MHz | 3 |
| Output Capacitance | Cob |  | 3.5 | 6 | pF | VCB = 10 V, IE = 0, f = 1 MHz | 3 |
| Input Capacitance | Cib |  | 9 |  | pF | VEB = 0.5 V, IC = 0, f = 1 MHz | 3 |
| Noise Figure (BC546/BC547/BC548 row) | NF |  | 2 | 10 | dB | VCE = 5 V, IC = 200 μA, f = 1 kHz, RG = 2 kΩ | 3 |

## CAD (KiCad official)

- Symbol: `BC546BTF`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `bc546btf-etched.step` / `bc546btf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc546btf.step` / `bc546btf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/bc546btf-d.pdf) (8 pp, sha256 `e75c6bde7cc28fa7`, retrieved 2026-11-05, 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/bc546btf-datasheet.pdf)