# RB521S-40

**Changjiang Electronics Tech (CJ)** · Schottky Barrier Diodes (SBD) · SOD-523

RB521S-40 from Changjiang Electronics Tech (CJ), 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 | K | passive | Cathode: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjiang Electronics Tech (CJ) |
| 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 voltage | V(BR) | 40 |  |  | V | IR=0.1mA | 1 |
| Reverse current | IR |  |  | 20 | μA | VR=10V | 1 |
| Reverse current | IR |  |  | 90 | μA | VR=40V | 1 |
| Forward voltage | VF |  | 0.16 | 0.3 | V | IF=10mA | 1 |
| Forward voltage | VF |  | 0.31 | 0.45 | V | IF=100mA | 1 |
| Forward voltage | VF |  | 0.41 | 0.54 | V | IF=200mA | 1 |
| Non-repetitive peak reverse voltage | VRM |  |  | 45 | V |  | 1 |
| Peak repetitive reverse voltage | VRRM |  |  | 40 | V |  | 1 |
| Working peak reverse voltage | VRWM |  |  | 40 | V |  | 1 |
| RMS reverse voltage | VR(RMS) |  |  | 28 | V |  | 1 |
| Average rectified output current | IO |  |  | 200 | mA |  | 1 |
| Non-repetitive peak forward surge current | IFSM |  |  | 1 | A | @t=8.3ms | 1 |
| Power dissipation | PD |  |  | 150 | mW |  | 1 |
| Thermal resistance from junction to ambient | RθJA |  |  | 667 | ℃/W |  | 1 |
| Junction temperature | TJ |  |  | 125 | ℃ |  | 1 |
| Storage temperature | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `RB521S-40`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `rb521s-40-etched.step` / `rb521s-40-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `rb521s-40.step` / `rb521s-40.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjiang Electronics Tech (CJ) datasheet](docs/rb521s-40-datasheet.pdf) (4 pp, sha256 `ec0e970c8aa740fe`, retrieved 2026-10-21, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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-40-datasheet.pdf)