# BZX84C20

**Wild Goose** · Zener Diodes · SOT-23

BZX84C20 from Wild Goose, in a SOT-23. 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 | A | passive | Zener diode anode, shown at pin 1 of the SOT-23 internal diagram; the datasheet gives VF 0.9 V at IF = 10 mA. |
| 2 | NC | unconnected | No internal connection; pin 2 is drawn as an unconnected terminal in the SOT-23 diagram. |
| 3 | K | passive | Zener diode cathode; BZX84C20 has nominal VZ of 20 V (18.8 V to 21.2 V) at IZT = 5 mA and 300 mW maximum power dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Wild Goose |
| Package | SOT-23 |
| Category | Diodes |
| Pins | 3 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Zener voltage (nominal) with min/max | VZ | 18.8 | 20 | 21.2 | V | @ IZT=5mA | 2 |
| Maximum Zener impedance | ZZT |  |  | 55 | Ω | @ IZT=5mA, f=1kHz (Note 3) | 2 |
| Maximum Zener impedance at knee | ZZK |  |  | 225 | Ω | @ IZK=1.0mA, f=1kHz (Note 3) | 2 |
| Maximum reverse current | IR |  |  | 0.1 | μA | @ VR=14.0V | 2 |
| Temperature coefficient of Zener voltage | θVZ | 14.4 |  | 18 | mV/°C | @ IZT=5mA | 2 |
| Forward voltage | VF |  |  | 0.9 | V | @ IF = 10mA; pulsed, period=5ms, pulse width=300μs (Note 2) | 1 |
| Power dissipation | Pd |  |  | 300 | mW | Ta=25℃; Note 1: device terminals kept at ambient temperature | 1 |
| Thermal resistance, junction to ambient | RθJA |  |  | 417 | ℃/W | Ta=25℃ | 1 |
| Junction temperature | Tj |  |  | 150 | ℃ | Ta=25℃ | 1 |
| Storage temperature range | Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BZX84C20`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c20-etched.step` / `bzx84c20-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c20.step` / `bzx84c20.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Wild Goose datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603378065137414144) (3 pp, sha256 `2ded0c3521581959`, retrieved 2026-10-18, 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/bzx84c20-datasheet.pdf)