# FMMT624TA-HXY

**HXY MOSFET** · Bipolar (BJT) · SOT-23

FMMT624TA-HXY from HXY MOSFET, 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 | input | Base; emitter-base voltage limited to 5 V (VEBO) and base drive sets collector current up to 1 A. |
| 2 | E | passive | Emitter of the NPN transistor, current return for the 1 A collector current. |
| 3 | C | passive | Collector; rated 150 V to emitter (VCEO), 170 V to base (VCBO) and 1 A continuous collector current. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Collector-base breakdown voltage | V(BR)CBO | 170 |  |  | V | IC=100µA, IE=0 | 2 |
| Collector-emitter breakdown voltage | V(BR)CEO | 150 |  |  | V | IC=10mA, IB=0 | 2 |
| Emitter-base breakdown voltage | V(BR)EBO | 5 |  |  | V | IE=100µA, IC=0 | 2 |
| Collector cut-off current | ICBO |  |  | 0.1 | µA | VCB=150V, IE=0 | 2 |
| Emitter cut-off current | IEBO |  |  | 0.1 | µA | VEB=4V, IC=0 | 2 |
| DC current gain | hFE(1) | 100 |  |  |  | VCE=10V, IC=1mA | 2 |
| DC current gain | hFE(2) | 100 |  | 300 |  | VCE=10V, IC=250mA | 2 |
| DC current gain | hFE(3) | 50 |  |  |  | VCE=10V, IC=500mA | 2 |
| DC current gain | hFE(4) | 10 |  |  |  | VCE=10V, IC=1A | 2 |
| Collector-emitter saturation voltage | VCE(sat)(1) |  |  | 0.2 | V | IC=250mA, IB=25mA | 2 |
| Collector-emitter saturation voltage | VCE(sat)(2) |  |  | 0.3 | V | IC=500mA, IB=50mA | 2 |
| Base-emitter turn-on voltage | VBE(on) |  |  | 1 | V | VCE=10V, IC=500mA | 2 |
| Base-emitter saturation voltage | VBE(sat) |  |  | 1 | V | IC=500mA, IB=50mA | 2 |
| Transition frequency | fT | 100 |  |  | MHz | VCE=10V,IC (test current garbled in text) | 2 |
| Collector output capacitance | Cob |  |  | 10 | pF | VCB=10V, IE=0 | 2 |

## CAD (KiCad official)

- Symbol: `FMMT624TA-HXY`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `fmmt624ta-hxy-etched.step` / `fmmt624ta-hxy-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `fmmt624ta-hxy.step` / `fmmt624ta-hxy.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [HXY MOSFET datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604449842400157696) (5 pp, sha256 `8089a60f6abef8dd`, retrieved 2026-10-19, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/fmmt624ta-hxy-datasheet.pdf)