# BZX84C12-E3-08

**Vishay Intertech** · Zener Diodes · SOT-23

BZX84C12-E3-08 from Vishay Intertech, 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 single Zener diode, shown connected to the diode in the page 1 schematic. |
| 2 | NC | unconnected | Shown on the page 1 schematic with no connection to the diode, so treated as not connected. |
| 3 | K | passive | Cathode of the single Zener diode, which conducts at the Zener voltage of 11.40 to 12.60 V (12 V nominal) at IZT1 = 5 mA for the BZX84C12. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Vishay Intertech |
| 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 | VZ | 11.4 | 12 | 12.6 | V | IZT1 = 5 mA; Tamb = 25 °C | 2 |
| Reverse leakage current | IR |  |  | 0.1 | μA | VR = 8 V | 2 |
| Dynamic resistance | ZZ |  |  | 25 | Ω | IZT1 = 5 mA; f = 1 kHz | 2 |
| Dynamic resistance (knee) | ZZK |  |  | 150 | Ω | IZT2 = 1 mA; f = 1 kHz | 2 |
| Temperature coefficient of VZ | αVZ | 6 |  | 9 | 10-4/°C | IZT1 = 5 mA | 2 |
| Power dissipation | Ptot |  |  | 500 | mW | RthJL = 250 K/W | 2 |
| Power dissipation on FR-4 board | Ptot |  |  | 300 | mW | On FR-4 board with recommended soldering footprint | 2 |
| Junction temperature | Tj |  |  | 150 | °C |  | 2 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 2 |
| Operating temperature range | Top | -55 |  | 150 | °C |  | 2 |
| Thermal resistance junction to lead | RthJL |  |  | 250 | K/W |  | 2 |
| Thermal resistance junction to ambient | RthJA |  |  | 420 | K/W | According to JEDEC 51-3 on FR-4 board with recommended soldering footprint | 2 |

## CAD (KiCad official)

- Symbol: `BZX84C12-E3-08`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 1.01 mm tall, datasheet A, nominal). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `bzx84c12-e3-08-etched.step` / `bzx84c12-e3-08-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c12-e3-08.step` / `bzx84c12-e3-08.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Vishay Intertech datasheet](docs/bzx84c12-e3-08-datasheet.pdf) (6 pp, sha256 `d7d519b8048ee97c`, retrieved 2026-11-12, tier: manufacturer)
- **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-e3-08-datasheet.pdf)