# BZB84-B18

**Nexperia** · Zener Diodes · SOT-23

BZB84-B18 from Nexperia, in a SOT-23. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | K1 | passive | Cathode of Zener diode 1. Reverse breakdown (Zener) voltage V_Z = 17.60 V to 18.40 V at I_Z = 5 mA; forward voltage V_F ≤ 0.9 V at I_F = 10 mA. Non-repetitive peak reverse current I_ZSM ≤ 1.5 A (t_p = 100 µs). |
| 2 | K2 | passive | Cathode of Zener diode 2. Reverse breakdown (Zener) voltage V_Z = 17.60 V to 18.40 V at I_Z = 5 mA; forward voltage V_F ≤ 0.9 V at I_F = 10 mA. Non-repetitive peak reverse current I_ZSM ≤ 1.5 A (t_p = 100 µs). |
| 3 | A | passive | Common anode shared by both Zener diodes (dual common-anode configuration). Total power dissipation for the device is limited to 300 mW at T_amb ≤ 25 °C. |

## Key specifications

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

## Ordering variants

Same part, different packaging or reel option.

- `BZB84-B18`

## CAD (KiCad official)

- Symbol: `BZB84-B18`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzb84-b18-etched.step` / `bzb84-b18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzb84-b18.step` / `bzb84-b18.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Nexperia datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914782736404480) (14 pp, sha256 `d909f500a84da6be`, retrieved 2026-08-17, tier: lcsc)
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/bzb84-b18-datasheet.pdf)