# BC33725TFR

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

BC33725TFR 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; VCEO is 45 V for BC337 and 25 V for BC338, and DC collector current is rated to 800 mA. |
| 2 | Base | passive | Base of the NPN transistor; emitter-base voltage is rated to 5 V maximum. |
| 3 | Emitter | passive | Emitter of the NPN transistor; it is the reference for the VCEO, VCES and VEBO ratings. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | TO-92-3 |
| Category | Transistors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `BC33725TFR`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92-3 (KiCad packages3D, STEP)
- 3D model files: `bc33725tfr-etched.step` / `bc33725tfr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bc33725tfr.step` / `bc33725tfr.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](docs/bc33725tfr-datasheet.pdf) (7 pp, sha256 `dcd5f8a77672a01a`, retrieved 2026-10-23, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (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/bc33725tfr-datasheet.pdf)