# 1SS181

**hongjiacheng** · Switching Diodes · SOT-23

1SS181 from hongjiacheng, 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 | A1 | passive | Anode of the first diode; the function diagram shows it opposite the common pin 3, within an 80 V, 100 mA fast switching diode. |
| 2 | A2 | passive | Anode of the second diode; the function diagram shows it opposite the common pin 3, within an 80 V, 100 mA fast switching diode. |
| 3 | K | passive | Common cathode of the two diodes in the dual-diode function diagram. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## CAD (KiCad official)

- Symbol: `1SS181`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `1ss181-etched.step` / `1ss181-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `1ss181.step` / `1ss181.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755887507441627136) (3 pp, sha256 `510ded7cd6ad8e0d`, 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/1ss181-datasheet.pdf)