# BSS123K

**Siliup** · MOSFETs · SOT-23

BSS123K from Siliup, 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; gate-source voltage limited to ±20 V (VGSS), threshold 1.3 to 2.5 V at ID=250µA, with ESD protection of 2KV. |
| 2 | S | passive | Source; continuous drain current up to 170 mA, with body diode forward voltage max 1.2 V at IS=1A. |
| 3 | D | passive | Drain; drain-source voltage rated 100 V (VDSS) with continuous drain current 170 mA and pulsed 680 mA. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `BSS123K`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bss123k-etched.step` / `bss123k-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bss123k.step` / `bss123k.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Siliup datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604429447047368704) (5 pp, sha256 `3b916dc8a978669e`, 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/bss123k-datasheet.pdf)