# PXT2222A

**Changjing** · Bipolar (BJT) · SOT-89-3L

PXT2222A from Changjing, in a SOT-89-3L. 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, driven to control collector current; the datasheet rates the emitter-base voltage VEBO at 6 V. |
| 2 | COLLECTOR | passive | Collector terminal, rated for VCBO 75 V, VCEO 40 V, continuous collector current IC 600 mA and collector power dissipation PC 0.5 W. |
| 3 | EMITTER | passive | Emitter terminal, with emitter-base breakdown voltage V(BR)EBO of 6 V and the same 6 V VEBO rating as the base-emitter limit. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOT-89-3L |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `PXT2222A`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `pxt2222a-etched.step` / `pxt2222a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pxt2222a.step` / `pxt2222a.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/8586174820001697792) (2 pp, sha256 `afb3530f12bb900c`, retrieved 2026-10-09, 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/pxt2222a-datasheet.pdf)