# BZX84J-B18

**Nexperia** · Zener Diodes · SOD-323F

BZX84J-B18 from Nexperia, in a SOD-323F. 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 | cathode | passive | Cathode of the Zener diode, identified by the marking bar on the package. |
| 2 | anode | passive | Anode of the Zener diode; the datasheet states no further pin-specific limits for this terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOD-323F |
| Category | Diodes |
| Pins | 2 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| working voltage | VZ | 17.6 |  | 18.4 | V | IZ = 5 mA | 5 |
| differential resistance | rdif |  |  | 225 | Ω | IZ = 5 mA | 5 |
| differential resistance | rdif |  |  | 20 | Ω | IZ = 1 mA | 5 |
| reverse current | IR |  |  | 0.05 | A | VR = 12.6 V | 5 |
| temperature coefficient | SZ | 12.4 |  | 16 | mV/K | IZ = 5 mA | 5 |
| diode capacitance | Cd |  |  | 93 | pF | f = 1 MHz; VR = 0 V | 5 |
| non-repetitive peak reverse current | IZSM |  |  | 1.5 | A | tp = 100 µs; square wave; Tj = 25 °C prior to surge | 5 |
| forward voltage | VF |  |  | 0.9 | V | IF = 10 mA | 3 |
| forward voltage | VF |  |  | 1.1 | V | IF = 100 mA | 3 |
| forward current | IF |  |  | 250 | mA |  | 3 |
| non-repetitive peak reverse power dissipation | PZSM |  |  | 40 | W | tp = 100 µs; square wave; Tj = 25 °C prior to surge | 3 |
| total power dissipation | Ptot |  |  | 550 | mW | Tamb ≤ 25 °C; FR4 PCB, mounting pad for cathode 1 cm2 | 3 |
| junction temperature | Tj |  |  | 150 | °C |  | 3 |
| ambient temperature | Tamb | -55 |  | 150 | °C |  | 3 |
| storage temperature | Tstg | -65 |  | 150 | °C |  | 3 |
| thermal resistance from junction to ambient | Rth(j-a) |  |  | 230 | K/W | in free air; FR4 PCB, mounting pad for cathode 1 cm2 | 3 |
| thermal resistance from junction to solder point | Rth(j-sp) |  |  | 55 | K/W | junction to solder point, cathode tab | 3 |

## CAD (KiCad official)

- Symbol: `BZX84J-B18`
- Footprint: `Diode_SMD:D_SOD-323F`
- 3D model: SOD-323F (KiCad packages3D, STEP)
- 3D model files: `bzx84j-b18-etched.step` / `bzx84j-b18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84j-b18.step` / `bzx84j-b18.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://assets.nexperia.com/documents/data-sheet/BZX84J-B18.pdf) (13 pp, sha256 `fcfb79c5f982558d`, retrieved 2026-10-26, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/bzx84j-b18-datasheet.pdf)