# BZX84C12

**hongjiacheng** · Zener Diodes · SOT-23

BZX84C12 from hongjiacheng, 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 | Anode of the zener diode, shown in the function diagram as the diode's anode side; the zener voltage VZ for BZX84C12 is 12V nominal (11.4V to 12.7V) at IZT=5mA. |
| 2 | NC | unconnected | Pin 2 is shown in the function diagram with no internal connection to the diode. |
| 3 | K | passive | Cathode of the zener diode, marked by the cathode line on the package; power dissipation is limited to 300mW. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `BZX84C12`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c12-etched.step` / `bzx84c12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c12.step` / `bzx84c12.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8755882033879236608) (4 pp, sha256 `a65683624fb8339f`, retrieved 2026-10-09, 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/bzx84c12-datasheet.pdf)