# DO3401B

**DOINGTER** · MOSFETs · SOT-23

DO3401B from DOINGTER, 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, threshold VGS(th) -0.6 V to -1.2 V at ID=-250μA. |
| 2 | D | passive | Drain; drain-source voltage -30 V, continuous drain current -4.2 A at TA=25℃, pulsed -16.8 A. |
| 3 | S | passive | Source of the P-channel MOSFET; RDS(ON) below 50 mΩ at VGS=-10V (typ 43 mΩ). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DOINGTER |
| 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 |
| Continuous Drain Current | ID |  |  | -4.2 | A | TA=25℃ | 1 |
| Continuous Drain Current | ID |  |  | -3 | A | TA=100℃ | 1 |
| Pulsed Drain Current | IDM |  |  | -16.8 | A | Repetitive rating: pulse width limited by maximum junction temperature (note 2) | 1 |
| Power Dissipation | PD |  |  | 1.2 | W |  | 1 |
| Operating and Storage Junction Temperature Range | TJ, TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance, Junction to Ambient | RθJA |  |  | 104 | ℃/W |  | 1 |
| Drain-Source Breakdown Voltage | BVDSS | -30 |  |  | V | VGS=0V, ID=-250μA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | μA | VGS=0V, VDS=-30V | 2 |
| Gate-Source Leakage Current | IGSS | -100 |  | 100 | nA | VGS=±12V, VDS=0A | 2 |
| Gate-Source Threshold Voltage | VGS(th) | -0.6 |  | -1.2 | V | VGS=VDS, ID=-250μA | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 43 | 50 | mΩ | VGS=-10V, ID=-4.3A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 47 | 61 | mΩ | VGS=-4.5V, ID=-3.5A | 2 |
| Drain-Source On-State Resistance | RDS(ON) |  | 56 | 72 | mΩ | VGS=-2.5V, ID=-2.4A | 2 |
| Diode Forward Voltage | VSD |  | -0.7 | -1 | V | IS=-1A, VGS=0V | 2 |
| Continuous Drain Current (body diode) | IS |  |  | -4.2 | A | VD=VG=0V | 2 |
| Pulsed Drain Current (body diode) | ISM |  |  | -16.8 | A |  | 2 |

## CAD (KiCad official)

- Symbol: `DO3401B`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `do3401b-etched.step` / `do3401b-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `do3401b.step` / `do3401b.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [DOINGTER datasheet](docs/do3401b-datasheet.pdf) (7 pp, sha256 `9d7a10c5a4d37261`, retrieved 2026-10-19, 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/do3401b-datasheet.pdf)