# FMMT720

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

FMMT720 from Changjing, 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 | BASE | input | Base terminal of the PNP transistor; the datasheet rates base current at -0.5 A (IB, absolute maximum). |
| 2 | EMITTER | passive | Emitter terminal of the PNP transistor; the datasheet gives emitter-base breakdown of -5 V (VEBO) and does not state a separate emitter current limit. |
| 3 | COLLECTOR | passive | Collector terminal of the PNP transistor; the datasheet rates collector current at -1.5 A continuous (IC) and -4 A peak pulse (ICM), with collector-emitter voltage of -40 V (VCEO). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `FMMT720`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `fmmt720-etched.step` / `fmmt720-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fmmt720.step` / `fmmt720.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/8586175491807698944) (5 pp, sha256 `2b3de26fb43c2a5a`, 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/fmmt720-datasheet.pdf)