# A44

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

A44 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; the datasheet gives emitter-base breakdown V(BR)EBO of 6 V (IE=10µA, IC=0) and VEBO of 6 V as device-level limits. |
| 2 | COLLECTOR | passive | Collector terminal of the NPN transistor; the datasheet rates collector-base voltage VCBO at 400 V, collector-emitter voltage VCEO at 400 V, and collector current IC at 200 mA continuous (300 mA pulsed). |
| 3 | EMITTER | passive | Emitter terminal of the NPN transistor; the datasheet rates emitter-base voltage VEBO at 6 V. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `A44`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89-3L (KiCad packages3D, STEP)
- 3D model files: `a44-etched.step` / `a44-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `a44.step` / `a44.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/8586181533467729920) (4 pp, sha256 `e0bccb683431a380`, 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/a44-datasheet.pdf)