# SI2318DS-T1-E3-MS

**MSKSEMI** · MOSFETs · SOT-23

SI2318DS-T1-E3-MS from MSKSEMI, 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 | G | input | Gate of the N-channel MOSFET, with VGS rated ±20 V and threshold VGS(th) 1.0 V min to 2.5 V max at 250 uA. |
| 2 | S | passive | Source of the N-channel MOSFET, with continuous source current up to 4 A. |
| 3 | D | passive | Drain of the N-channel MOSFET, rated 40 V VDS and 4 A continuous drain current (16 A pulsed). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-23 |
| Category | Transistors/Thyristors |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `SI2318DS-T1-E3-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `si2318ds-t1-e3-ms-etched.step` / `si2318ds-t1-e3-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `si2318ds-t1-e3-ms.step` / `si2318ds-t1-e3-ms.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8555434959459741696) (6 pp, sha256 `1aa216659dc9fdc8`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/si2318ds-t1-e3-ms-datasheet.pdf)