# MDD3400

**MDD（Microdiode Electronics）** · MOSFETs · SOT-23

MDD3400 from MDD（Microdiode Electronics）, 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 pin of the MDD3400 N-channel MOSFET; the datasheet gives no separate electrical limit for this pin. |
| 2 | S | passive | Source pin of the MDD3400 N-channel MOSFET; the datasheet gives no separate electrical limit for this pin. |
| 3 | D | passive | Drain pin of the MDD3400 N-channel MOSFET; the datasheet gives no separate electrical limit for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MDD（Microdiode Electronics） |
| 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 | Printed as ±12 V | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A | Note 1 | 1 |
| Pulsed Drain Current | IDM |  |  | 23 | A | Note 1 | 1 |
| Power Dissipation | PD |  |  | 1.5 | W | Note 2: 1 in² FR-4 board, still air, Ta=25°C | 1 |
| Storage Temperature | Tstg | -50 |  | 150 | °C |  | 1 |
| Thermal Resistance, Junction-Ambient | RθJA |  |  | 100 | °C/W | Note 2 | 1 |
| Drain-Source Breakdown Voltage | V(BR)DSS | 30 |  |  | V | VGS=0V, ID=250μA | 2 |
| Gate-Source Leakage Current (forward) | IGSS |  |  | 100 | nA | VGS=20V | 2 |
| Gate-Source Leakage Current (reverse) | IGSS | -100 |  |  | nA | VGS=-20V | 2 |
| Drain-Source Leakage Current | IDSS |  |  | 1 | μA | VDS=24V, VGS=0V | 2 |
| Gate Threshold Voltage | VGS(TH) | 0.5 | 0.8 | 1.2 | V | VDS=VGS, ID=250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 20 | 22 | mΩ | VGS=10V, ID=5.8A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 32 | 35 | mΩ | VGS=4.5V, ID=5A | 2 |
| Drain-Source Diode Forward Voltage | VSD |  | 0.82 | 1.2 | V | IS=3A, VGS=0V | 2 |
| Source Drain current (Body Diode) | ISD |  |  | 1.5 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `MDD3400`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `mdd3400-etched.step` / `mdd3400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `mdd3400.step` / `mdd3400.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MDD（Microdiode Electronics） datasheet](docs/mdd3400-datasheet.pdf) (5 pp, sha256 `3b42ec708c8d2c48`, retrieved 2026-10-21, 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/mdd3400-datasheet.pdf)