# TDM3424

**Techcode Semicon** · MOSFETs · SOT-89

TDM3424 from Techcode Semicon, in a SOT-89. 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; the datasheet gives VGS max ±20 V, gate threshold 1 V min to 3 V max at ID=250µA, and RDS(ON) of 32 mΩ max at VGS=4.5 V and 23 mΩ max at VGS=10 V. |
| 2 | D | passive | Drain; the datasheet gives VDS max 30 V, continuous ID of 8 A at 25°C and 6 A at 70°C, and pulsed IDM of 20 A. |
| 3 | S | passive | Source; the datasheet shows it as the source terminal of the N-channel MOSFET with the body diode running from source to drain (VSD 1.1 V max at IS=1 A). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Techcode Semicon |
| Package | SOT-89 |
| 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 | BVDSS | 30 |  |  | V | VGS=0V ID=250μA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | 1 | μA | VDS=24V,VGS=0V | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±20V,VDS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | 1 | 1.9 | 3 | V | VDS=VGS,ID=250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 26 | 32 | mΩ | VGS=4.5V, ID=5A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 20 | 23 | mΩ | VGS=10V, ID=8A | 2 |
| Diode Forward Voltage | VSD |  | 0.8 | 1.1 | V | VGS=0V,IS=1A | 2 |
| Drain-Source Voltage | VDS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGS |  |  | 20 | V |  | 1 |
| Drain Current @ Continuous | ID |  |  | 8 | A | TA=25℃ | 1 |
| Drain Current @ Continuous | ID |  |  | 6 | A | TA=70℃ | 1 |
| Drain Current @ Current-Pulsed | IDM |  |  | 20 | A |  | 1 |
| Maximum Power Dissipation | PD |  |  | 3.5 | W | TA=25℃ | 1 |
| Operating Junction and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  | 35 |  | ℃/W | Surface mounted on 1in2 FR4 board, t ≤ 10 sec (Note 2) | 1 |

## CAD (KiCad official)

- Symbol: `TDM3424`
- Footprint: `Package_TO_SOT_SMD:SOT-89-3`
- 3D model: SOT-89 (KiCad packages3D, STEP)
- 3D model files: `tdm3424-etched.step` / `tdm3424-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tdm3424.step` / `tdm3424.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Techcode Semicon datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588905073510658048) (7 pp, sha256 `e98ab9669a953cd3`, 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/tdm3424-datasheet.pdf)