# KO3401

**KEXIN** · MOSFETs · SOT-23-3

KO3401 from KEXIN, in a SOT-23-3. 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 P-channel MOSFET, with gate-source voltage rated at ±12 V (VGS). |
| 2 | Source | passive | Source terminal of the P-channel MOSFET; the datasheet gives no separate pin-level limit beyond the absolute maximum ratings. |
| 3 | Drain | passive | Drain terminal of the P-channel MOSFET, with drain-source voltage rated at -30 V (VDS) and continuous drain current of -4.2 A at Ta = 25℃. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KEXIN |
| Package | SOT-23-3 |
| 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 |  |  | -3.5 | A | Ta = 70℃ | 1 |
| Pulsed Drain Current | IDM |  |  | -30 | A |  | 1 |
| Power Dissipation | PD |  |  | 1.4 | W | Ta = 25℃ | 1 |
| Power Dissipation | PD |  |  | 1 | W | Ta = 70℃ | 1 |
| Thermal Resistance Junction-to-Ambient |  |  |  | 90 | ℃/W | t ≤ 10s | 1 |
| Thermal Resistance Junction-to-Ambient |  |  |  | 125 | ℃/W |  | 1 |
| Thermal Resistance Junction-to-Case | RthJC |  |  | 60 | ℃/W |  | 1 |
| Junction Temperature | TJ |  |  | 150 | ℃ |  | 1 |
| Storage Temperature Range | Tstg | -55 |  | 150 | ℃ |  | 1 |
| Drain-Source Breakdown Voltage | VDSS | -30 |  |  | V | ID=-250μA, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | μA | VDS=-24V, VGS=0V | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -5 | μA | VDS=-24V, VGS=0V, TJ=55℃ | 2 |
| Gate-Body Leakage Current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Gate Threshold Voltage | VGS(th) | -0.4 | -1 | -1.3 | V | VDS=VGS, ID=-250μA | 2 |
| Static Drain-Source On-Resistance | RDS(On) |  | 42 | 50 | mΩ | VGS=-10V, ID=-4.2A | 2 |
| Static Drain-Source On-Resistance | RDS(On) |  |  | 75 | mΩ | VGS=-10V, ID=-4.2A, TJ=125℃ | 2 |
| Static Drain-Source On-Resistance | RDS(On) |  | 53 | 65 | mΩ | VGS=-4.5V, ID=-4A | 2 |
| Static Drain-Source On-Resistance | RDS(On) |  | 80 | 120 | mΩ | VGS=-2.5V, ID=-1A | 2 |
| On State Drain Current | ID(ON) | -25 |  |  | A | VGS=-4.5V, VDS=-5V | 2 |
| Forward Transconductance | gFS | 7 | 11 |  | S | VDS=-5V, ID=-5A | 2 |
| Maximum Body-Diode Continuous Current | IS |  |  | -2.2 | A |  | 2 |
| Diode Forward Voltage | VSD |  | -0.75 | -1 | V | IS=-1A, VGS=0V | 2 |

## CAD (KiCad official)

- Symbol: `KO3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `ko3401-etched.step` / `ko3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ko3401.step` / `ko3401.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KEXIN datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884505453342720) (4 pp, sha256 `0961686a9377e303`, 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/ko3401-datasheet.pdf)