# BAV21WS-HE3-18

**Vishay Intertech** · Switching Diodes · SOD-323

BAV21WS-HE3-18 from Vishay Intertech, 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 cathode bar on the SOD-323 package; BAV21WS withstands continuous reverse voltage VR = 200 V and repetitive peak reverse voltage VRRM = 250 V. |
| 2 | A | passive | Anode of the single diode; forward continuous current IF is rated 250 mA and VF is 1 V max at IF = 100 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| 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 |
|---|---|---|---|---|---|---|---|
| Continuous reverse voltage | VR |  |  | 200 | V | BAV21WS, Tamb = 25 °C | 1 |
| Repetitive peak reverse voltage | VRRM |  |  | 250 | V | BAV21WS, Tamb = 25 °C | 1 |
| Forward continuous current | IF |  |  | 250 | mA | Valid provided that leads are kept at ambient temperature | 1 |
| Rectified current (average) | IF(AV) |  |  | 200 | mA | half wave rectification with resistive load | 1 |
| Repetitive peak forward current | IFRM |  |  | 625 | mA | f ≥ 50 Hz, θ = 180° | 1 |
| Surge forward current | IFSM |  |  | 1 | A | t < 1 s, TJ = 25 °C | 1 |
| Power dissipation | Ptot |  |  | 200 | mW | Tamb = 25 °C | 1 |
| Thermal resistance junction to ambient air | RthJA |  |  | 625 | K/W | Tamb = 25 °C | 1 |
| Thermal resistance junction to lead | RthJL |  |  | 450 | K/W | Tamb = 25 °C | 1 |
| Junction temperature | Tj |  |  | 150 | °C |  | 1 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 1 |
| Operating temperature range | Top | -55 |  | 150 | °C |  | 1 |
| Forward voltage | VF |  |  | 1 | V | IF = 100 mA | 2 |
| Forward voltage | VF |  |  | 1.25 | V | IF = 200 mA | 2 |
| Reverse leakage current | IR |  |  | 100 | nA | VR = 200 V, BAV21WS | 2 |
| Reverse leakage current | IR |  |  | 15 | μA | VR = 200 V, TJ = 100 °C, BAV21WS | 2 |
| Dynamic forward resistance | rf |  |  | 5 | Ω | IF = 10 mA | 2 |
| Diode capacitance | CD |  |  | 1.5 | pF | VR = 0, f = 1 MHz | 2 |
| Reverse recovery time | trr |  |  | 50 | ns | IF = 30 mA, IR = 30 mA, iR = 3 mA, RL = 100 Ω | 2 |

## CAD (KiCad official)

- Symbol: `BAV21WS-HE3-18`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bav21ws-he3-18-etched.step` / `bav21ws-he3-18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bav21ws-he3-18.step` / `bav21ws-he3-18.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Vishay Intertech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590905888381353984) (4 pp, sha256 `272dc7cc1ab96e86`, 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/bav21ws-he3-18-datasheet.pdf)