# TDM3428B

**Techcode Semicon** · MOSFETs · TO-252

TDM3428B from Techcode Semicon, in a TO-252. 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, with a gate-source voltage limit of ±20 V and a gate threshold of 1.4 V min to 2.5 V max at 250 μA. |
| 2 | D | passive | Drain terminal, also the exposed tab, with a drain-source voltage rating of 30 V and a continuous drain current of 45 A at TC=25℃ (limited by bonding wire). |
| 3 | S | passive | Source terminal of the N-channel MOSFET, with a diode continuous forward current of 5 A at TC=25℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Techcode Semicon |
| Package | TO-252 |
| 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 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 | -10 |  | 10 | μA | VGS=±20V,VDS=0V | 2 |
| Gate Threshold Voltage | VGS(th) | 1.4 | 1.8 | 2.5 | V | VDS=VGS,ID=250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 9.7 | 10.8 | mΩ | VGS=10V, ID=10A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 13.5 | 17.5 | mΩ | VGS=4.5V, ID=8A | 2 |
| Input Capacitance | Ciss |  | 450 | 600 | PF | VDS=15V,VGS=0V, F=1.0MHz | 2 |
| Turn-on Delay Time | td(on) |  | 8.5 | 16 | nS | VDS=15V, RL=15 Ω, VGEN=10V, RG=6 Ω ID=1A | 2 |
| Turn-on Rise Time | tr |  | 10 | 18 | nS | VDS=15V, RL=15 Ω, VGEN=10V, RG=6 Ω ID=1A | 2 |
| Turn-Off Delay Time | td(off) |  | 14 | 26 | nS | VDS=15V, RL=15 Ω, VGEN=10V, RG=6 Ω ID=1A | 2 |
| Turn-Off Fall Time | tf |  | 10.6 | 19 | nS | VDS=15V, RL=15 Ω, VGEN=10V, RG=6 Ω ID=1A | 2 |
| Total Gate Charge | Qg |  | 8 | 12 | nC | VDS=15V,ID=10A,VGS=10V | 2 |
| Diode Forward Voltage | VSD |  | 0.8 | 1.1 | V | VGS=0V,IS=5A | 2 |
| Drain-Source Voltage | VDS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGS |  |  | 20 | V |  | 1 |
| Diode Continuous Forward Current | Is |  |  | 5 | A | TC=25℃ | 1 |
| Continuous Drain Current | ID |  |  | 45 | A | TC=25℃ (Note 1) | 1 |
| Continuous Drain Current | ID |  |  | 30 | A | TC=100℃ (Note 1) | 1 |
| Pulse Drain Current | IDM |  |  | 36 | A | TA=25℃ | 1 |
| Maximum Power Dissipation | PD |  |  | 40 | W | TC=25℃ | 1 |
| Maximum Power Dissipation | PD |  |  | 16 | W | TC=100℃ | 1 |
| Maximum Power Dissipation | PD |  |  | 3.5 | W | TA=25℃ | 1 |
| Maximum Power Dissipation | PD |  |  | 2.2 | W | TA=70℃ | 1 |
| Maximum Operating Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance, Junction-to-Case | RθJC |  | 2.8 |  | ℃/W |  | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  | 50 |  | ℃/W | t<10s | 1 |

## CAD (KiCad official)

- Symbol: `TDM3428B`
- Footprint: `Package_TO_SOT_SMD:TO-252-2`
- 3D model: TO-252 (KiCad packages3D, STEP)
- 3D model files: `tdm3428b-etched.step` / `tdm3428b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tdm3428b.step` / `tdm3428b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Techcode Semicon datasheet](docs/tdm3428b-datasheet.pdf) (7 pp, sha256 `cd1ca45992819f0a`, retrieved 2026-10-30, 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/tdm3428b-datasheet.pdf)