# MPS651

**Changjing** · Bipolar Transistors - BJT · TO-92

MPS651 from Changjing, in a TO-92. 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 | E | passive | Emitter of the NPN transistor (pin 1 of the TO-92); VEBO is 5 V max and the emitter-base breakdown voltage V(BR)EBO is 5 V min. |
| 2 | B | passive | Base of the NPN transistor (pin 2 of the TO-92); base-emitter saturation voltage VBE(sat) is 1.2 V max at IC=1A, IB=100mA. |
| 3 | C | passive | Collector of the NPN transistor (pin 3 of the TO-92); VCBO is 80 V, VCEO is 60 V and continuous IC is 2 A max. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | TO-92 |
| Category | Triode/MOS Tube/Transistor |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MPS651`
- Footprint: `Package_TO_SOT_THT:TO-92_Inline`
- 3D model: TO-92 (KiCad packages3D, STEP)
- 3D model files: `mps651-etched.step` / `mps651-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mps651.step` / `mps651.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](docs/mps651-datasheet.pdf) (5 pp, sha256 `8544da390acbb036`, retrieved 2026-10-28, 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/mps651-datasheet.pdf)