# MMBTA55

**hongjiacheng** · Bipolar (BJT) · SOT-23

MMBTA55 from hongjiacheng, in a SOT-23. 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 | B | passive | Base terminal of the PNP transistor; base-emitter saturation voltage is specified at IC=-10mA, VCE=-1.0V with a maximum of -1.2V. |
| 2 | E | passive | Emitter terminal of the PNP transistor; the emitter-base voltage rating VEBO is -4.0V with emitter-base cut-off current IEBO limited to -100nA at VEB=-4.0V. |
| 3 | C | passive | Collector terminal of the PNP transistor; rated for a collector-base voltage VCBO of -60V, collector-emitter voltage VCEO of -60V, and collector current IC of -500mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `MMBTA55`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mmbta55-etched.step` / `mmbta55-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mmbta55.step` / `mmbta55.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8564879594475593728) (3 pp, sha256 `b5c449d097c0b4b4`, 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/mmbta55-datasheet.pdf)