# TF3402

**TF** · MOSFETs · SOT-23

TF3402 from TF, 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 | GATE | input | Gate terminal of the N-channel MOSFET; gate-source voltage is rated to ±12 V (absolute maximum). |
| 2 | SOURCE | passive | Source terminal of the N-channel MOSFET and the reference for gate-source and drain-source voltages. |
| 3 | DRAIN | passive | Drain terminal of the N-channel MOSFET; drain-source voltage is rated to 30 V with continuous drain current of 4 A at TA=25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TF |
| Package | SOT-23 |
| Category | Transistors |
| 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 | TA=25°C | 1 |
| Pulsed Drain Current | IDM |  |  | 15 | A | Note B: repetitive rating, pulse width limited by junction temperature | 1 |
| Power Dissipation | PD |  |  | 1.25 | W | TA=25°C | 1 |
| Junction and Storage Temperature Range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |
| Maximum Junction-to-Ambient, t ≤ 10s | RθJA |  | 70 | 90 | °C/W | t ≤ 10s | 1 |
| Maximum Junction-to-Ambient, Steady-State | RθJA |  | 100 | 125 | °C/W | Steady-State | 1 |
| Maximum Junction-to-Lead, Steady-State | RθJL |  | 63 | 80 | °C/W | Steady-State | 1 |
| Drain-Source Breakdown Voltage | BVDSS | 30 |  |  | V | ID=250µA, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | µA | VDS=24V, VGS=0V | 2 |
| Gate-Body Leakage Current | IGSS |  |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Gate Threshold Voltage | VGS(th) | 0.8 | 1 | 1.6 | 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) |  |  | 70 | mΩ | VGS=10V, ID=4A | 2 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 75 | mΩ | VGS=4.5V, ID=2.3A | 1 |
| Static Drain-Source On-Resistance | RDS(ON) |  |  | 105 | mΩ | VGS=2.5V, ID=1.5A | 2 |
| Forward Transconductance | gFS | 8 |  |  | S | VDS=5V, ID=4A | 2 |
| Diode Forward Voltage | VSD |  | 0.8 | 1.2 | V | IS=1A, VGS=0V | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | 2.5 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `TF3402`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `tf3402-etched.step` / `tf3402-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tf3402.step` / `tf3402.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TF datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588918259453845504) (5 pp, sha256 `1cdca27ead775590`, retrieved 2026-10-17, 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/tf3402-datasheet.pdf)