# BAS40WS

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

BAS40WS 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, identified by the marking bar on the SOD-323 package; Schottky diode with VR up to 40 V and IF of 200 mA. |
| 2 | A | passive | Anode of the single Schottky barrier diode (forward voltage 0.38 V typ at IF=1mA, 1 V at IF=40mA). |

## 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 |
|---|---|---|---|---|---|---|---|
| Peak Repetitive Reverse Voltage / Working Peak Reverse Voltage / DC Blocking Voltage | VRRM/VRWM/VR |  |  | 40 | V |  | 1 |
| Forward Continuous Current | IF |  |  | 200 | mA |  | 1 |
| Non-repetitive Peak Forward Surge Current | IFSM |  |  | 600 | mA | t=8.3ms | 1 |
| Power Dissipation | Pd |  |  | 200 | mW | Ta=25 | 1 |
| Thermal Resistance Junction to Ambient | RθJA |  |  | 500 | ℃/W |  | 1 |
| Storage Temperature | TSTG | -55 |  | 150 | ℃ |  | 1 |
| Junction temperature | TJ |  |  | 125 | ℃ |  | 1 |
| Reverse breakdown voltage | V(BR) | 40 |  |  | V | IR=10μA | 1 |
| Forward voltage 1 | VF1 |  |  | 0.38 | V | IF=1mA | 1 |
| Forward voltage 2 | VF2 |  |  | 0.5 | V | IF=10mA | 1 |
| Forward voltage 3 | VF3 |  |  | 1 | V | IF=40mA | 1 |
| Reverse current | IR |  | 20 | 200 | nA | VR=30V | 1 |
| Capacitance between terminals | CT |  | 4 | 5 | pF | VR=0V,f=1MHz | 1 |
| Reverse recovery time | trr |  |  | 5 | ns | IF=IR=10mA, Irr=0.1XIR, RL=100Ω | 1 |

## CAD (KiCad official)

- Symbol: `BAS40WS`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bas40ws-etched.step` / `bas40ws-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bas40ws.step` / `bas40ws.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/8590224186808836096) (4 pp, sha256 `9b7aed863a96b89c`, retrieved 2026-10-22, tier: lcsc)
- **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/bas40ws-datasheet.pdf)