# BZT52-B4V7X

**Nexperia** · Zener Diodes · SOD-123

BZT52-B4V7X 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. The datasheet gives no pin-specific electrical limits for this terminal (limiting values apply to the device). |
| 2 | A | passive | Anode; the datasheet gives no pin-specific electrical limits for this terminal (limiting values apply to the device). |

## 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 |
|---|---|---|---|---|---|---|---|
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA; pulse test tp ≤ 300 µs; δ ≤ 0.02 | 3 |
| Tolerance (B series) |  | -2 |  | 2 | % |  | 1 |
| Working voltage (min) | VZ | 4.61 |  |  | V | Tj = 25 °C | 4 |
| Working voltage (max) | VZ |  |  | 4.79 | V | Tj = 25 °C | 4 |
| Maximum differential resistance (first rdif column) | rdif |  |  | 500 | Ω |  | 4 |
| Maximum differential resistance (second rdif column) | rdif |  |  | 78 | Ω |  | 4 |
| Reverse current | IR |  |  | 3 | µA | VR = 2 V | 4 |
| Temperature coefficient (min) | SZ | -3.5 |  |  | mV/K |  | 4 |
| Temperature coefficient (max) | SZ |  |  | 0.2 | mV/K |  | 4 |
| Diode capacitance | Cd |  |  | 300 | pF | f = 1 MHz; VR = 0 V | 4 |
| Non-repetitive peak reverse current | IZSM |  |  | 6 | A | tp = 100 µs; Tamb = 25 °C | 4 |
| Continuous forward current | IF |  |  | 250 | mA |  | 3 |
| Non-repetitive peak reverse power dissipation | PZSM |  |  | 40 | W | tp = 100 µs; square wave; Tamb = 25 °C prior to surge | 3 |
| Total power dissipation (cathode pad 1 cm2) | Ptot |  |  | 590 | mW | Tamb ≤ 25 °C; FR4 PCB, mounting pad for cathode 1 cm2 | 3 |
| Total power dissipation (standard footprint) | Ptot |  |  | 350 | mW | Tamb ≤ 25 °C; FR4 PCB, standard footprint | 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 (standard footprint) | Rth(j-a) |  |  | 350 | K/W | in free air; FR4 PCB, standard footprint | 3 |
| Thermal resistance junction to ambient (cathode pad 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-B4V7X`
- Footprint: `Diode_SMD:D_SOD-123F`
- 3D model: SOD-123 (KiCad packages3D, STEP)
- 3D model files: `bzt52-b4v7x-etched.step` / `bzt52-b4v7x-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52-b4v7x.step` / `bzt52-b4v7x.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/8588916336080924672) (11 pp, sha256 `af4d7e0d2280a363`, retrieved 2026-10-18, 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-b4v7x-datasheet.pdf)