# BZX84-C43

**Nexperia** · Zener Diodes · SOT-23(TO-236AB)

BZX84-C43 from Nexperia, in a SOT-23(TO-236AB). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model). Symbol and footprint from KiCad-official CAD; the 3D model is generated from the datasheet's package dimensions.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | A | passive | Anode of the voltage regulator diode, shown as A in the graphic symbol; the datasheet gives no separate electrical limit for this pin. |
| 2 | n.c. | unconnected | Not connected, as stated in the pinning table. |
| 3 | K | passive | Cathode of the voltage regulator diode, shown as K in the graphic symbol; the datasheet gives no separate electrical limit for this pin. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Nexperia |
| Package | SOT-23(TO-236AB) |
| Category | Diodes |
| Pins | 3 |

## 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 | 40 |  |  | V | IZ = 2 mA | 7 |
| Working voltage (max) | VZ |  |  | 46 | V | IZ = 2 mA | 7 |
| Maximum differential resistance | rdif |  |  | 375 | Ω | IZ = 0.5 mA | 7 |
| Maximum differential resistance | rdif |  |  | 150 | Ω | IZ = 2 mA | 7 |
| Reverse current | IR |  |  | 0.05 | μA | VR = 30.1 V | 7 |
| Temperature coefficient (min) | SZ | 37.6 |  |  | mV/K | IZ = 2 mA | 7 |
| Temperature coefficient (max) | SZ |  |  | 46.6 | mV/K | IZ = 2 mA | 7 |
| Diode capacitance | Cd |  |  | 40 | pF | f = 1 MHz; VR = 0 V | 7 |
| Non-repetitive peak reverse current | IZSM |  |  | 0.6 | A | tp = 100 μs; square wave; Tj = 25 °C | 7 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA; tp ≤ 100 μs; δ ≤ 0.02 | 4 |
| Forward current | IF |  |  | 200 | 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 |  |  | 250 | mW | Tamb ≤ 25 °C; device mounted on FR4 PCB | 4 |
| Junction temperature | Tj |  |  | 150 | °C |  | 4 |
| Ambient temperature | Tamb | -55 |  | 150 | °C |  | 4 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 4 |
| Thermal resistance from junction to ambient | Rth(j-a) |  |  | 500 | K/W | in free air; FR4 PCB, single-sided 70 µm copper | 4 |
| Thermal resistance from junction to solder point | Rth(j-sp) |  |  | 330 | K/W | soldering point of cathode tab | 4 |

## CAD (land: KiCad; 3D: generated from the datasheet)

- Symbol: `BZX84-C43`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23(TO-236AB), generated on the KiCad land (body 1.3 x 2.9 mm, terminals on the pads, 1.0 mm tall, datasheet A, midpoint of min and max). KiCad's stock model for this land is taller than the datasheet allows, so the model is generated from the datasheet drawing; the dimensions come from the datasheet drawing where it was read and are defaults otherwise (see provenance.model_3d_generated), not the manufacturer's CAD (STEP)
- 3D model files: `bzx84-c43-etched.step` / `bzx84-c43-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84-c43.step` / `bzx84-c43.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/BZX84-C43.pdf) (14 pp, sha256 `e6278027e055c1b0`, retrieved 2026-11-13, 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:** land: KiCad official libraries (CC-BY-SA 4.0); 3D: generated from the datasheet's package dimensions (provenance.model_3d_generated).

[Datasheet PDF](docs/bzx84-c43-datasheet.pdf)