# BZX38450-C3V3-QF

**Nexperia** · Zener Diodes · SOD-323

BZX38450-C3V3-QF from Nexperia, in a SOD-323. 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 voltage regulator diode; the marking bar on the package indicates the cathode. |
| 2 | A | passive | Anode of the voltage regulator diode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOD-323 |
| 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 (min) | VZ | 3.13 |  |  | V | Tj = 25 °C | 4 |
| Working voltage (max) | VZ |  |  | 3.47 | V | Tj = 25 °C | 4 |
| Differential resistance (max) | rdiff |  |  | 600 | Ω | IZ = 50 µA | 4 |
| Differential resistance (max) | rdiff |  |  | 100 | Ω | IZ = 1 mA | 4 |
| Differential resistance (max) | rdiff |  |  | 7.5 | Ω | IZ = 5 mA | 4 |
| Temperature coefficient SZ (min) | SZ | -3.5 |  |  | mV/K |  | 4 |
| Temperature coefficient SZ (max) | SZ |  |  | 1.2 | mV/K |  | 4 |
| Diode capacitance (max) | Cd |  |  | 160 | pF | f = 1 MHz; VR = 0 V | 4 |
| Forward voltage (max) | VF |  |  | 0.9 | V | IF = 10 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02 | 4 |
| Working voltage tolerance (series) |  | -5 |  | 5 | % | approximately ± 5 %, series tolerance | 1 |
| Forward current (max) | IF |  |  | 250 | mA |  | 3 |
| Non-repetitive peak reverse power dissipation (max) | PZSM |  |  | 40 | W | tp = 100 µs; square wave; Tj = 25 °C; prior to surge | 3 |
| Total power dissipation (max) | Ptot |  |  | 300 | mW | Tamb ≤ 25 °C; device mounted on FR4 PCB | 3 |
| Junction temperature (max) | Tj |  |  | 150 | °C |  | 3 |
| Ambient temperature range | Tamb | -55 |  | 150 | °C |  | 3 |
| Storage temperature range | Tstg | -65 |  | 150 | °C |  | 3 |
| Thermal resistance junction to ambient (max) | Rth(j-a) |  |  | 415 | K/W | in free air; device mounted on FR4 PCB | 3 |
| Thermal resistance junction to solder point (max) | Rth(j-sp) |  |  | 110 | K/W | soldering point of cathode tab | 3 |

## CAD (KiCad official)

- Symbol: `BZX38450-C3V3-QF`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bzx38450-c3v3-qf-etched.step` / `bzx38450-c3v3-qf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx38450-c3v3-qf.step` / `bzx38450-c3v3-qf.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/BZX38450-C3V3-QF.pdf) (10 pp, sha256 `d3fb6f2f0e7015f7`, retrieved 2026-11-05, 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/bzx38450-c3v3-qf-datasheet.pdf)