# 2SK3666G-3-AE3-R

**UTC Unisonic Tech** · JFETs · SOT-23

2SK3666G-3-AE3-R from UTC Unisonic Tech, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | S | passive | Source terminal with maximum drain-source voltage of 30V and maximum continuous drain current of 10mA. |
| 2 | D | passive | Drain terminal with maximum drain-source voltage of 30V and drain-source leakage current of 0.6-6.0mA at VDS=10V, VGS=0V. |
| 3 | G | input | Gate control input terminal with maximum gate current of 10mA and gate-source leakage current of −1.0nA at VGS=−20V, VDS=0V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | UTC Unisonic Tech |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `2SK3666G-3-AE3-R`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `2sk3666g-3-ae3-r-etched.step` / `2sk3666g-3-ae3-r-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `2sk3666g-3-ae3-r.step` / `2sk3666g-3-ae3-r.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [UTC Unisonic Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590234938785370112) (3 pp, sha256 `28aa6e1134e41644`, retrieved 2026-09-18, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-4-6` (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/2sk3666g-3-ae3-r-datasheet.pdf)