# UT3401G-AE3-R

**UTC Unisonic Tech** · MOSFETs · SOT-23

UT3401G-AE3-R from UTC Unisonic Tech, 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 | S | passive | Source terminal of the UT3401 P-channel enhancement-mode power MOSFET, labeled '1.Source' in the symbol and listed under pin 1 in the SOT-23 pin assignment. |
| 2 | G | input | Gate terminal of the UT3401 P-channel enhancement-mode power MOSFET, labeled '2.Gate' in the symbol and listed under pin 2 in the SOT-23 pin assignment; gate-source voltage is rated at ±12 V (VGSS). |
| 3 | D | passive | Drain terminal of the UT3401 P-channel enhancement-mode power MOSFET, labeled '3.Drain' in the symbol and listed under pin 3 in the SOT-23 pin assignment; drain-source voltage is rated at -30 V (VDSS). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| 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 |
|---|---|---|---|---|---|---|---|
| Gate Threshold Voltage | VGS(TH) | -0.7 | -1 | -1.3 | V | VDS=VGS, ID=-250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 42 | 50 | mΩ | VGS=-10V, ID=-4.2A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 53 | 65 | mΩ | VGS=-4.5V, ID=-4A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 80 | 120 | mΩ | VGS=-2.5V, ID=-1A | 2 |
| Drain-Source Breakdown Voltage | BVDSS | -30 |  |  | V | ID=-250μA, VGS=0V | 2 |
| Drain-Source Leakage Current | IDSS |  |  | -1 | µA | VDS=-24V, VGS=0V | 2 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Drain-Source Diode Forward Voltage | VSD |  | -0.75 | -1 | V | VDS=0V, IS=-1A | 2 |
| Maximum Continuous Drain-Source Diode Forward Current | IS |  |  | -2.2 | A |  | 2 |
| Drain-Source Voltage | VDSS |  |  | -30 | V |  | 2 |
| Gate-Source Voltage | VGSS | -12 |  | 12 | V |  | 2 |
| Continuous Drain Current (Note 1) | ID |  |  | -4.2 | A |  | 2 |
| Pulsed Drain Current (Note 2) | IDM |  |  | -30 | A |  | 2 |
| Power Dissipation (Note 1) | PD |  |  | 1.4 | W |  | 2 |
| Junction Temperature | TJ |  |  | 150 | °C |  | 2 |
| Storage Temperature | TSTG | -55 |  | 150 | °C |  | 2 |
| Junction-to-Ambient Thermal Resistance | θJA |  | 65 | 90 | °C/W |  | 2 |

## CAD (KiCad official)

- Symbol: `UT3401G-AE3-R`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ut3401g-ae3-r-etched.step` / `ut3401g-ae3-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ut3401g-ae3-r.step` / `ut3401g-ae3-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586187735892185088) (5 pp, sha256 `4794320ca8b32598`, retrieved 2026-10-18, 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/ut3401g-ae3-r-datasheet.pdf)