# BZX384-A3V9-QX

**Nexperia** · Zener Diodes · SOD-323

BZX384-A3V9-QX 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 tolerance (BZX384-A series, E24 ±1 %) |  | -1 |  | 1 | % |  | 1 |
| Working voltage | VZ | 3.86 |  | 3.94 | V | IZ = 5 mA | 5 |
| Maximum differential resistance | rdif |  |  | 600 | Ω | IZ = 1 mA | 5 |
| Maximum differential resistance | rdif |  |  | 90 | Ω | IZ = 5 mA | 5 |
| Reverse current | IR |  |  | 3 | μA | VR = 1 V | 5 |
| Temperature coefficient | SZ | -3.5 |  | 0 | mV/K | IZ = 5 mA | 5 |
| Diode capacitance | Cd |  |  | 450 | pF | f = 1 MHz; VR = 0 V | 5 |
| Non-repetitive peak reverse current | IZSM |  |  | 6 | A | tp = 100 μs; square wave; Tj = 25 °C | 5 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA | 4 |
| Forward voltage | VF |  |  | 1.1 | V | IF = 100 mA | 4 |
| Forward current | IF |  |  | 250 | mA |  | 4 |
| Non-repetitive peak reverse power dissipation | PZSM |  |  | 40 | W | tp = 100 μs; square wave; Tj = 25 °C prior to surge | 4 |
| Total power dissipation | Ptot |  |  | 300 | mW | Tamb ≤ 25 °C; device mounted on FR4 PCB, single-sided copper, tin-plated, standard footprint | 4 |
| Junction temperature | Tj |  |  | 150 | °C |  | 4 |
| Ambient temperature | Tamb | -65 |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Thermal resistance from junction to ambient | Rth(j-a) |  |  | 415 | K/W | in free air; device mounted on FR4 PCB, single-sided copper, tin-plated, standard footprint | 4 |
| Thermal resistance from junction to solder point | Rth(j-sp) |  |  | 110 | K/W | soldering point of cathode tab | 4 |

## CAD (KiCad official)

- Symbol: `BZX384-A3V9-QX`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bzx384-a3v9-qx-etched.step` / `bzx384-a3v9-qx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx384-a3v9-qx.step` / `bzx384-a3v9-qx.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/BZX384-A3V9-QX.pdf) (14 pp, sha256 `846a5e80d6d55616`, retrieved 2026-10-27, 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/bzx384-a3v9-qx-datasheet.pdf)