# SE3401

**Leiditech** · MOSFETs · SOT-23

SE3401 from Leiditech, 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; gate-source voltage limited to ±12 V, with threshold VGS(th) of -0.6 V min, -0.9 V typ and -1.4 V max at ID=-250μA. |
| 2 | S | passive | Source; body-diode continuous current IS is -4.4 A and drain current ID is -4.4 A at TA=25℃. |
| 3 | D | passive | Drain; drain-source voltage rated -30 V, drain current -4.4 A continuous and -27 A pulsed. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Leiditech |
| 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 |
| Drain Current | ID |  |  | -4.4 | A | TA=25℃ @ Steady State | 1 |
| Drain Current | ID |  |  | -3.5 | A | TA=70℃ @ Steady State | 1 |
| Pulsed Drain Current | IDM |  |  | -27 | A |  | 1 |
| Total Power Dissipation | PD |  |  | 1.2 | W | TA=25℃ | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance Junction-to-Ambient | RθJA |  |  | 105 | ℃/W | @ Steady State | 1 |
| Gate Threshold Voltage | VGS(th) | -0.6 | -0.9 | -1.4 | V | VDS= VGS, ID=-250μA | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 45.5 | 55 | mΩ | VGS= -10V, ID=-4.4A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 52 | 68 | mΩ | VGS= -4.5V, ID=-4A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  | 64 | 96 | mΩ | VGS= -2.5V, ID=-2A | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS= ±12V, VDS=0V | 2 |
| Diode Forward Voltage | VSD |  | -0.8 | -1.2 | V | IS=-4.4A,VGS=0V | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | -4.4 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `SE3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `se3401-etched.step` / `se3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `se3401.step` / `se3401.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Leiditech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918076523470848) (5 pp, sha256 `9d1dc8305c373adb`, retrieved 2026-10-18, 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/se3401-datasheet.pdf)