# AO3402A

**UMW** · MOSFETs · SOT-23

AO3402A from UMW, 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 | G | input | GATE terminal of the N-channel MOSFET; gate-source voltage is rated at ±12 V (VGS), and the device is specified for operation with gate voltage as low as 2.5 V. |
| 2 | S | passive | SOURCE terminal of the N-channel MOSFET, the return path for the drain current (ID continuous 4 A, pulsed 15 A). |
| 3 | D | passive | DRAIN terminal of the N-channel MOSFET; drain-source voltage is rated at 30 V (VDS) with continuous drain current of 4 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UMW |
| 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 |
|---|---|---|---|---|---|---|---|
| Drain-source voltage | VDS |  |  | 30 | V |  | 1 |
| Gate-source voltage | VGS | -12 |  | 12 | V |  | 1 |
| Continuous drain current | ID |  |  | 4 | A |  | 1 |
| Pulsed drain current | IDM |  |  | 15 | A | Repetitive rating, pulse width limited by junction temperature (note 1) | 1 |
| Power dissipation | PD |  |  | 0.35 | W | TA=25°C | 1 |
| Junction temperature | TJ |  |  | 150 | °C |  | 1 |
| Storage temperature | TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 125 | °C/W | Surface mounted on FR4 board, t≤10s (note 2) | 1 |
| Drain-source breakdown voltage | V(BR)DSS | 30 |  |  | V | VGS=0V, ID=250µA | 2 |
| Zero gate voltage drain current | IDSS |  |  | 1 | µA | VDS=24V, VGS=0V | 2 |
| Gate-body leakage current | IGSS | -100 |  | 100 | nA | VGS=±12V, VDS=0V | 2 |
| Gate threshold voltage | VGS(th) | 0.8 |  | 1.4 | V | VDS=VGS, ID=250μA | 2 |
| Drain-source on-resistance | RDS(ON) |  |  | 52 | mΩ | VGS=10V, ID=4A | 2 |
| Drain-source on-resistance | RDS(ON) |  |  | 65 | mΩ | VGS=4.5V, ID=3A | 2 |
| Drain-source on-resistance | RDS(ON) |  |  | 85 | mΩ | VGS=2.5V, ID=2A | 2 |
| Diode forward voltage | VSD |  |  | 1 | V | IS=1A, VGS=0V | 2 |

## CAD (KiCad official)

- Symbol: `AO3402A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ao3402a-etched.step` / `ao3402a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3402a.step` / `ao3402a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UMW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755874796909674496) (7 pp, sha256 `353a34342a0ef4bc`, 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/ao3402a-datasheet.pdf)