# RB521S30T5G

**onsemi** · Schottky Barrier Diodes (SBD) · SOD-523

RB521S30T5G from onsemi, 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 (polarity band) of the 30 V Schottky barrier diode; reverse voltage VR max 30 Vdc. |
| 2 | ANODE | passive | Anode of the Schottky diode; forward current DC IF max 200 mA with VF max 0.5 V at IF = 200 mA. |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Reverse Leakage | IR |  |  | 30 | A | VR = 10 V | 2 |
| Forward Voltage | VF |  |  | 0.5 | Vdc | IF = 200 mA | 2 |
| Reverse Voltage | VR |  |  | 30 | Vdc |  | 1 |
| Forward Current DC | IF |  |  | 200 | mA |  | 1 |
| Peak Forward Surge Current | IFSM |  |  | 1 | A | 60 Hz for 1 cycle | 1 |
| Total Device Dissipation | PD |  |  | 200 | mW | FR-5 Board, TA = 25°C | 1 |
| Derate above 25°C | PD |  |  | 1.57 | mW/°C | FR-5 Board | 1 |
| Thermal Resistance, Junction-to-Ambient | RθJA |  |  | 635 | °C/W | FR-5 Minimum Pad | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -55 |  | 125 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `RB521S30T5G`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `rb521s30t5g-etched.step` / `rb521s30t5g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rb521s30t5g.step` / `rb521s30t5g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/rb521s30t5-d.pdf) (4 pp, sha256 `db633deb388bbc21`, retrieved 2026-10-22, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/rb521s30t5g-datasheet.pdf)