# BZT52-B2V4-QX

**Nexperia** · Zener Diodes · SOD-123

BZT52-B2V4-QX 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; the marking bar on the package indicates the cathode. |
| 2 | A | passive | Anode of the two-lead SOD123 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 (type B, min) | VZ | 2.35 |  |  | V | IZ = 5 mA; Tj = 25 °C unless otherwise specified | 4 |
| Working voltage (type B, max) | VZ |  |  | 2.45 | V | IZ = 5 mA; Tj = 25 °C unless otherwise specified | 4 |
| Maximum differential resistance | rdif |  |  | 400 | Ω | IZ = 1 mA; Tj = 25 °C unless otherwise specified | 4 |
| Maximum differential resistance | rdif |  |  | 85 | Ω | IZ = 5 mA; Tj = 25 °C unless otherwise specified | 4 |
| Reverse current | IR |  |  | 50 | μA | VR = 1 V; Tj = 25 °C unless otherwise specified | 4 |
| Temperature coefficient (min) | SZ | -3.5 |  |  | mV/K | IZ = 5 mA; Tj = 25 °C unless otherwise specified | 4 |
| Temperature coefficient (max) | SZ |  |  | 0 | mV/K | IZ = 5 mA; Tj = 25 °C unless otherwise specified | 4 |
| Diode capacitance | Cd |  |  | 450 | pF | f = 1 MHz; VR = 0 V | 4 |
| Non-repetitive peak reverse current | IZSM |  |  | 6 | 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 | 4 |
| 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 (standard footprint) | Ptot |  |  | 350 | mW | Tamb ≤ 25 °C; FR4 PCB, standard footprint | 3 |
| Total power dissipation (mounting pad for cathode 1 cm²) | Ptot |  |  | 590 | mW | FR4 PCB, mounting pad for cathode 1 cm² | 3 |
| Junction temperature | Tj |  |  | 150 | °C |  | 3 |
| Ambient temperature (min) | Tamb | -55 |  |  | °C |  | 3 |
| Ambient temperature (max) | Tamb |  |  | 150 | °C |  | 3 |
| Storage temperature (min) | Tstg | -65 |  |  | °C |  | 3 |
| Storage temperature (max) | Tstg |  |  | 150 | °C |  | 3 |
| Thermal resistance junction to ambient (free air) | Rth(j-a) |  |  | 350 | K/W | In free air; FR4 PCB, standard footprint | 3 |
| Thermal resistance junction to ambient (mounting pad for cathode 1 cm²) | Rth(j-a) |  |  | 210 | K/W | FR4 PCB, mounting pad for cathode 1 cm² | 3 |
| Thermal resistance junction to solder point | Rth(j-sp) |  |  | 55 | K/W | Soldering point of cathode tab | 3 |

## CAD (KiCad official)

- Symbol: `BZT52-B2V4-QX`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `bzt52-b2v4-qx-etched.step` / `bzt52-b2v4-qx-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52-b2v4-qx.step` / `bzt52-b2v4-qx.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/8604347316425928704) (12 pp, sha256 `3b4b96d8d0378fe9`, retrieved 2026-10-17, tier: lcsc)
- **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/bzt52-b2v4-qx-datasheet.pdf)