# RB521S-30

**TWGMC** · Schottky Diodes · SOD-523

RB521S-30 from TWGMC, in a SOD-523. 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 | Cathode | passive | Cathode terminal of the Schottky barrier diode; the datasheet pinning lists pin 1 as cathode. |
| 2 | Anode | passive | Anode terminal of the Schottky barrier diode; the datasheet pinning lists pin 2 as anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| Package | SOD-523 |
| Category | Diodes |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `RB521S-30`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `rb521s-30-etched.step` / `rb521s-30-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rb521s-30.step` / `rb521s-30.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [TWGMC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588915014321786880) (3 pp, sha256 `d35e97d645a44308`, retrieved 2026-10-12, 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/rb521s-30-datasheet.pdf)