# KY3407

**KY** · MOSFETs · SOT-23

KY3407 from KY, 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 | GATE | input | Gate terminal of the P-channel MOSFET; the gate-source voltage is rated VGSS = ±20 V. |
| 2 | SOURCE | passive | Source terminal of the MOSFET, the reference for VGS; the datasheet gives a body-diode forward current limit of IS = -4.1 A. |
| 3 | DRAIN | passive | Drain terminal of the MOSFET; drain-source voltage is rated VDSS = -30 V with continuous drain current ID = -4.1 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KY |
| 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 | VDSS |  |  | -30 | V | Ta=25°C | 1 |
| Gate-Source Voltage | VGSS | -20 |  | 20 | V | Ta=25°C | 1 |
| Continuous Drain Current | ID |  |  | -4.1 | A | Ta=25°C | 1 |
| Pulsed Drain Current | IDM |  |  | -16.4 | A | Ta=25°C, note 1 | 1 |
| Total Power Dissipation | Ptot |  |  | 1.67 | W | Ta=25°C | 1 |
| Thermal Resistance, Junction to Ambient | RθJA |  |  | 75 | ℃/W | Ta=25°C | 1 |
| Storage Temperature Range | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Junction Temperature | TJ |  |  | 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, TJ = 25℃ | 2 |
| Gate to Body Leakage Current | IGSS | -100 |  | 100 | nA | VGS = ±20V, VDS = 0V | 2 |
| Gate Threshold Voltage | VGS(th) | -1 | -1.4 | -2.5 | V | VDS = VGS, ID = -250μA | 2 |
| Static Drain-Source On-Resistance | RDS(on) |  | 48 | 60 | mΩ | VGS = -10V, ID = -4.1A | 2 |
| Static Drain-Source On-Resistance | RDS(on) |  | 62 | 85 | mΩ | VGS = -4.5V, ID = -3.5A | 2 |
| Forward Transconductance | gFS | 5 |  |  | S | VDS = -5V, ID = -4.1A | 2 |
| Maximum Continuous Drain to Source Diode Forward Current | IS |  |  | -4.1 | A |  | 2 |
| Maximum Pulsed Drain to Source Diode Forward Current | ISM |  |  | -16.4 | A |  | 2 |
| Drain to Source Diode Forward Voltage | VSD |  | -0.89 | -1.2 | V | VGS = 0V, ISD = -4.1A, TJ = 25℃ | 2 |

## CAD (KiCad official)

- Symbol: `KY3407`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `ky3407-etched.step` / `ky3407-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ky3407.step` / `ky3407.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/8590234569745068032) (5 pp, sha256 `aa758a8d9219e200`, 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/ky3407-datasheet.pdf)