# AO3402MI-MS

**MSKSEMI** · MOSFETs · SOT-23-3L

AO3402MI-MS from MSKSEMI, in a SOT-23-3L. 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 | G | input | Gate; controls the channel, with absolute maximum VGS of ±12 V and threshold VGS(th) of 0.5 V min, 0.9 V typ and 1.4 V max at ID=250 uA. |
| 2 | S | passive | Source; the 4.0 A continuous current (TC=25℃) returns here, and the body diode runs from source to drain. |
| 3 | D | passive | Drain; rated for VDS of 30 V and 4.0 A continuous drain current (TC=25℃), with 16 A pulsed. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-23-3L |
| 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 |  | 2 |
| Gate-Source Voltage | VGS | -12 |  | 12 | V |  | 2 |
| Drain Current - Continuous | ID |  |  | 4 | A | TC=25℃ | 2 |
| Drain Current - Continuous | ID |  |  | 3 | A | TC=100℃ | 2 |
| Drain Current - Pulsed | IDM |  |  | 16 | A | Note 1: repetitive rating, pulse width limited by maximum junction temperature | 2 |
| Power Dissipation | PD |  |  | 1.4 | W | TC=25℃ | 2 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 2 |
| Operating Junction Temperature Range | TJ | -55 |  | 150 | ℃ |  | 2 |
| Thermal Resistance Junction to ambient | RθJA |  |  | 80 | ℃/W |  | 2 |
| Drain-Source Breakdown Voltage | BVDSS | 30 |  |  | V | VGS=0V, ID=250uA | 3 |
| Drain-Source Leakage Current | IDSS |  |  | 1 | uA | VDS=30V, VGS=0V, TJ=25℃ | 3 |
| Drain-Source Leakage Current | IDSS |  |  | 10 | uA | VDS=24V, VGS=0V, TJ=125℃ | 3 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±12V, VDS=0V | 3 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 47 | 60 | mΩ | VGS=4.5V, ID=4A | 3 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 60 | 85 | mΩ | VGS=2.5V, ID=3A | 3 |
| Gate Threshold Voltage | VGS(th) | 0.5 | 0.9 | 1.4 | V | VGS=VDS, ID=250uA | 3 |
| Continuous Source Current | IS |  |  | 4 | A | VG=VD=0V, Force Current | 3 |
| Pulsed Source Current | ISM |  |  | 8 | A |  | 3 |
| Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V, IS=1A, TJ=25℃ | 3 |

## CAD (KiCad official)

- Symbol: `AO3402MI-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `ao3402mi-ms-etched.step` / `ao3402mi-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3402mi-ms.step` / `ao3402mi-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590453660150108160) (7 pp, sha256 `d5d7bf7bb62019c6`, retrieved 2026-10-10, 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/ao3402mi-ms-datasheet.pdf)