# KYL3400

**KY** · MOSFETs · SOT-23-3L

KYL3400 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 N-channel MOSFET, rated for a gate-source voltage VGSS of ±12 V. |
| 2 | SOURCE | passive | Source terminal of the N-channel MOSFET, the reference for VGSS and for the body-diode forward voltage VSD, which is 1.2 V max at IS = 5.8 A and VGS = 0 V. |
| 3 | DRAIN | passive | Drain terminal of the N-channel MOSFET, rated for a drain-source voltage VDSS of 30 V and a continuous drain current ID of 5.8 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 Voltage | VDSS |  |  | 30 | V |  | 1 |
| Gate-Source Voltage | VGSS | -12 |  | 12 | V |  | 1 |
| Continuous Drain Current | ID |  |  | 5.8 | A | Ta= 25℃ | 1 |
| Continuous Drain Current | ID |  |  | 3.8 | A | Ta= 100℃ | 1 |
| Pulsed Drain Current | IDM |  |  | 23.2 | A | note1 | 1 |
| Power Dissipation | PD |  |  | 1.36 | W |  | 1 |
| Thermal Resistance, Junction to Ambient | RθJA |  |  | 92 | ℃/W |  | 1 |
| Operating and Storage Temperature Range | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| 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) | 0.5 | 0.9 | 1.4 | V | VDS=VGS, ID=250μA | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 19 | 26 | mΩ | VGS=10V, ID=4.2A | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 23 | 32 | mΩ | VGS=4.5V, ID=4A | 2 |
| Static Drain-Source on-Resistance | RDS(on) |  | 30 | 50 | mΩ | VGS=2.5V, ID=1A | 2 |
| Maximum Continuous Drain to Source Diode Forward Current | IS |  |  | 5.8 | A |  | 2 |
| Maximum Pulsed Drain to Source Diode Forward Current | ISM |  |  | 23.2 | A |  | 2 |
| Drain to Source Diode Forward Voltage | VSD |  |  | 1.2 | V | VGS=0V, IS=5.8A | 2 |

## CAD (KiCad official)

- Symbol: `KYL3400`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3L (KiCad packages3D, STEP)
- 3D model files: `kyl3400-etched.step` / `kyl3400-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kyl3400.step` / `kyl3400.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/8590233324485705728) (5 pp, sha256 `3a8f395f3bfe4a8c`, 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/kyl3400-datasheet.pdf)