# BZX84B18-AU

**PANJIT International** · Zener Diodes · SOT-23

BZX84B18-AU from PANJIT International, 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 pin 1 in the SINGLE polarity diagram. |
| 2 | NC | unconnected | Not connected to the diode in the SINGLE polarity diagram, which draws the diode between pins 1 and 3 only. |
| 3 | K | passive | Cathode of the single Zener diode, shown connected to pin 3 in the SINGLE polarity diagram. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 |
|---|---|---|---|---|---|---|---|
| Nominal Zener Voltage | VZ | 17.64 | 18 | 18.36 | V | @ IZT = 5.0 mA | 2 |
| Maximum Zener Impedance | ZZT |  |  | 45 | Ω | @ IZT = 5.0 mA | 2 |
| Maximum Zener Impedance (knee) | ZZK |  |  | 225 | Ω | @ IZK = 1.00 mA | 2 |
| Maximum Reverse Leakage Current | IR |  |  | 0.1 | μA | @ VR = 12.6 V | 2 |
| Maximum Power Dissipation | PD |  |  | 410 | mW | at 25°C, mounted on 5.0mm2 (.013mm thick) land areas (Note A) | 1 |
| Operating Junction and Storage Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `BZX84B18-AU`
- 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, 1.0 mm tall, datasheet A, midpoint of min and max). 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: `bzx84b18-au-etched.step` / `bzx84b18-au-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84b18-au.step` / `bzx84b18-au.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](docs/bzx84b18-au-datasheet.pdf) (6 pp, sha256 `0f3d674ac5ec45b4`, retrieved 2026-11-12, 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/bzx84b18-au-datasheet.pdf)