# AO3404A

**UMW** · MOSFETs · SOT-23

AO3404A 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; the datasheet rates the gate-source voltage VGS at ±20 V. |
| 2 | S | passive | SOURCE terminal of the N-channel MOSFET; the datasheet gives no source-specific limit, and the 30 V VDS and 20 V VGS ratings apply to the device as a whole. |
| 3 | D | passive | DRAIN terminal of the N-channel MOSFET; the device is rated for VDS = 30 V and continuous drain current ID = 5.8 A at TA = 25°C. |

## 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 Breakdown Voltage | VDSS | 30 |  |  | V | ID=250µA, VGS=0V | 2 |
| Gate-Body leakage current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±20V | 2 |
| Gate Threshold Voltage | VGS(th) | 1 | 1.9 | 2.5 | V | VDS=VGS, ID=250µA | 2 |
| On state drain current | ID(ON) | 10 |  |  | A | VGS=4.5V, VDS=5V | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 18 | 25 | mΩ | VGS=10V, ID=5.8A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 24 | 36 | mΩ | VGS=4.5V, ID=5A | 2 |
| Diode Forward Voltage | VSD |  | 0.76 | 1 | V | IS=1A | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | µA | VDS=24V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 5 | µA | VDS=24V, VGS=0V, TJ=55°C | 2 |
| Drain-Source Voltage | VDS |  |  | 30 | V | TA=25°C | 1 |
| Gate-Source Voltage | VGS | -20 |  | 20 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A | TA=25°C | 1 |
| Continuous Drain Current | ID |  |  | 4.9 | A | TA=70°C (label on datasheet reads TA=100°C in one place; see review) | 1 |
| Pulsed Drain Current | IDM |  |  | 20 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.4 | W | TA=25°C | 1 |
| Junction Temperature | TJ | -55 |  | 150 | °C |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | °C |  | 1 |
| Thermal Resistance Junction-to-Lead | RthJC |  |  | 60 | °C/W |  | 1 |
| Thermal Resistance Junction-to-Ambient | RthJA |  |  | 90 | °C/W | t ≤ 5sec | 1 |
| Thermal Resistance Junction-to-Ambient | RthJA |  |  | 125 | °C/W | Steady State | 1 |

## CAD (KiCad official)

- Symbol: `AO3404A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ao3404a-etched.step` / `ao3404a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ao3404a.step` / `ao3404a.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/8755874834087849984) (7 pp, sha256 `3f9127f002c15ddc`, 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/ao3404a-datasheet.pdf)