# KYL3401

**KY** · MOSFETs · SOT-23-3L

KYL3401 from KY, in a SOT-23-3L. 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; the datasheet gives a gate-source voltage rating of ±12 V. |
| 2 | SOURCE | passive | Source terminal of the P-channel MOSFET, the reference for the gate-source voltage. |
| 3 | DRAIN | passive | Drain terminal of the P-channel MOSFET; the datasheet gives a drain-source voltage of -30 V and a continuous drain current of -4.2 A at Ta=25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| Package | SOT-23-3L |
| 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 | V(BR)DSS | -30 |  |  | V | VGS=0V, ID=-250μA | 2 |
| Zero Gate Voltage Drain Current | IDSS |  |  | -1 | μA | VDS=-30V, VGS=0V | 2 |
| Gate to Body Leakage Current | IGSS | -100 |  | 100 | nA | VDS=0V, VGS=±12V | 2 |
| Gate Threshold Voltage | VGS(th) | -0.6 | -0.9 | -1.3 | V | VDS=VGS, ID=-250μA | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 48 | 60 | mΩ | VGS= -10V, ID= -4A | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 57 | 78 | mΩ | VGS= -4.5V, ID= -3A | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 77 | 112 | mΩ | VGS= -2.5V, ID= -1A | 2 |
| Maximum Continuous Drain to Source Diode Forward Current | IS |  |  | -4.2 | A |  | 2 |
| Maximum Pulsed Drain to Source Diode Forward Current | ISM |  |  | -30 | A |  | 2 |
| Drain to Source Diode Forward Voltage | VSD |  | -0.8 | -1.2 | V | VGS=0V, IS=-4.2A | 2 |
| Drain-Source Voltage | VDSS |  |  | -30 | V |  | 1 |
| Gate-Source Voltage | VGSS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | -4.2 | A | Ta=25℃ | 1 |
| Continuous Drain Current | ID |  |  | -2.7 | A | Ta=100℃ | 1 |
| Pulsed Drain Current | IDM |  |  | -30 | A | Note 1 repetitive rating, pulse width limited by max junction temperature | 1 |
| Power Dissipation | PD |  |  | 1.7 | W |  | 1 |
| Operating and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| Thermal Resistance, Junction to Ambient | RθJA |  |  | 76.2 | ℃/W |  | 1 |

## CAD (KiCad official)

- Symbol: `KYL3401`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `kyl3401-etched.step` / `kyl3401-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kyl3401.step` / `kyl3401.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KY datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590234504914116608) (5 pp, sha256 `334f9c99af69ec71`, retrieved 2026-10-18, 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/kyl3401-datasheet.pdf)