# B5817WS SJ

**Changjing** · Schottky Diodes · SOD-323

B5817WS SJ from Changjing, in a SOD-323. 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 end marked with the band and the '-' sign in the package drawing; the B5817WS (marking SJ) allows VRRM/VR of 20 V and IO of 1 A. |
| 2 | A | passive | Anode, the end marked '+' in the package drawing; forward voltage is 0.45 V max at IF=1 A and 0.75 V max at IF=3 A for the B5817WS. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Changjing |
| Package | SOD-323 |
| 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 breakdown voltage | V(BR) | 20 |  |  | V | IR= 1mA | 1 |
| Reverse voltage leakage current | IR |  |  | 1 | mA | VR=20V (B5817WS) | 1 |
| Forward voltage | VF |  |  | 0.45 | V | IF=1A | 1 |
| Forward voltage | VF |  |  | 0.75 | V | IF=3A | 1 |
| Diode capacitance | CD |  |  | 120 | pF | VR=4V, f=1MHz | 1 |
| Non-repetitive peak reverse voltage | VRM |  |  | 20 | V |  | 1 |
| Peak repetitive reverse voltage | VRRM |  |  | 20 | V |  | 1 |
| Working peak reverse voltage | VRWM |  |  | 20 | V |  | 1 |
| DC blocking voltage | VR |  |  | 20 | V |  | 1 |
| RMS reverse voltage | VR(RMS) |  |  | 14 | V |  | 1 |
| Average rectified output current | IO |  |  | 1 | A |  | 1 |
| Peak forward surge current | IFSM |  |  | 9 | A | t=8.3ms | 1 |
| Repetitive peak forward current | IFRM |  |  | 1.5 | A |  | 1 |
| Power dissipation | Pd |  |  | 250 | mW |  | 1 |
| Thermal resistance junction to ambient | RθJA |  |  | 400 | ℃/W |  | 1 |
| Storage temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Junction temperature | TJ |  |  | 125 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `B5817WS SJ`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `b5817ws-sj-etched.step` / `b5817ws-sj-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `b5817ws-sj.step` / `b5817ws-sj.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Changjing datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586172217974018048) (2 pp, sha256 `0613d1adee14bcbe`, retrieved 2026-10-31, 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/b5817ws-sj-datasheet.pdf)