# PDZ18BGWX

**Nexperia** · Zener Diodes · SOD-123

PDZ18BGWX from Nexperia, in a SOD-123. 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 | K | passive | Cathode of the Zener diode; the marking bar on the package indicates the cathode. |
| 2 | A | passive | Anode of the Zener diode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOD-123 |
| 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 | 17.56 |  | 18.35 | V | IZ = 5 mA, Tj = 25 °C | 4 |
| Maximum differential resistance | rdif |  |  | 80 | Ω | IZ = 0.5 mA | 4 |
| Maximum differential resistance | rdif |  |  | 20 | Ω | IZ = 5 mA | 4 |
| Reverse current | IR |  |  | 0.05 | μA | VR = 13.0 V | 4 |
| Temperature coefficient | SZ |  | 13 | 14.4 | mV/K | IZ = 5 mA | 4 |
| Diode capacitance | Cd |  |  | 93 | pF | f = 1 MHz; VR = 0 V | 4 |
| Non-repetitive peak reverse current | IZSM |  |  | 1.5 | A | tp = 100 μs; Tamb = 25 °C | 4 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA; pulse test tp ≤ 300 μs; δ ≤ 0.02 | 3 |
| Forward voltage | VF |  |  | 1.1 | V | IF = 100 mA; pulse test tp ≤ 300 μs; δ ≤ 0.02 | 3 |
| Forward current | IF |  |  | 200 | mA |  | 3 |
| Non-repetitive peak power dissipation | PZSM |  |  | 40 | W | tp = 100 μs; square wave; Tj = 25 °C prior to surge | 3 |
| Total power dissipation | Ptot |  |  | 365 | mW | Tamb ≤ 25 °C; FR4 PCB, standard footprint | 3 |
| Total power dissipation | Ptot |  |  | 625 | 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 junction to ambient | Rth(j-a) |  |  | 340 | K/W | in free air; FR4 PCB, standard footprint | 3 |
| Thermal resistance junction to ambient | Rth(j-a) |  |  | 200 | K/W | in free air; FR4 PCB, mounting pad for cathode 1 cm2 | 3 |
| Thermal resistance junction to solder point | Rth(j-sp) |  |  | 50 | K/W | Soldering point of cathode tab | 3 |
| Nominal working voltage | VZ |  | 18 |  | V | IZ = 5 mA | 4 |
| Tolerance (B2 series) |  | -2 |  | 2 | % | approximately | 1 |

## CAD (KiCad official)

- Symbol: `PDZ18BGWX`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `pdz18bgwx-etched.step` / `pdz18bgwx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pdz18bgwx.step` / `pdz18bgwx.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/PDZ18BGWX.pdf) (12 pp, sha256 `b02f2b4d94446a46`, retrieved 2026-10-23, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/pdz18bgwx-datasheet.pdf)