# BZX84C20A

**Shandong Jingdao Microelectronics** · Zener Diodes · SOT-23

BZX84C20A from Shandong Jingdao Microelectronics, 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 anode (Suffix A single-diode version); the diagram shows the diode connected between pins 1 and 3. |
| 2 | NC | unconnected | No internal connection shown in the Suffix A single-diode diagram. |
| 3 | K | passive | Zener cathode (Suffix A single-diode version); the nominal zener voltage of the BZX84C20A is 20V, with a 350mW maximum power dissipation. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Shandong Jingdao Microelectronics |
| 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 VZT (min) | VZT | 18.8 | 20 | 21.2 | V | at IZT = 5 mA; VZT tested with 20 ms pulses | 3 |
| Dynamic impedance ZZT | ZZT |  |  | 50 | Ω | at IZT = 5 mA | 3 |
| Reverse current IR | IR |  |  | 0.1 | μA | at VR = 15 V | 3 |
| Zener voltage tolerance (suffix C, ±5%) |  | -5 |  | 5 | % | Footnote (3): C: ±5% | 3 |
| Total power dissipation Ptot | Ptot |  |  | 350 | mW |  | 1 |
| Operating and storage temperature range | Tj, Tstg | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `BZX84C20A`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c20a-etched.step` / `bzx84c20a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c20a.step` / `bzx84c20a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Shandong Jingdao Microelectronics datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590899484451168256) (4 pp, sha256 `595e68d92b601ba8`, 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/bzx84c20a-datasheet.pdf)