# BZT52C43S

**TWGMC** · Zener Diodes · SOD-323

BZT52C43S from TWGMC, 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 zener diode, which goes positive in reverse breakdown; zener voltage range for the BZT52C43S is 40V min to 46V max at IZT = 2 mA, with total power dissipation of 200 mW max. |
| 2 | A | passive | Anode of the zener diode; forward voltage is 0.9 V at IF = 10 mA. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TWGMC |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage (VZT), min | VZT | 40 |  |  | V | @ IZT = 2 mA | 2 |
| Zener voltage (VZT), max | VZT |  |  | 46 | V | @ IZT = 2 mA | 2 |
| Maximum Zener impedance | ZZT |  |  | 700 | Ω | @ IZT = 2 mA | 2 |
| Reverse current | IR |  |  | 0.1 | μA | VR = 32 V | 2 |
| Power dissipation | PD |  |  | 200 | mW | Device mounted on ceramic PCB (Note 1) | 1 |
| Operating and storage temperature range | Tj, Tstg | -55 |  | 150 | °C |  | 1 |
| Forward voltage | VF |  | 0.9 |  | V | IF = 10 mA (Note 2) | 1 |
| Typical temperature coefficient |  |  | 33.4 |  | mV/°C | @ IZTC | 2 |
| Thermal resistance, junction to ambient | RθJA |  | 625 |  | °C/W |  | 1 |

## CAD (KiCad official)

- Symbol: `BZT52C43S`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bzt52c43s-etched.step` / `bzt52c43s-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52c43s.step` / `bzt52c43s.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TWGMC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588916735126196224) (3 pp, sha256 `dc5da2c24ed08b06`, retrieved 2026-11-02, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/bzt52c43s-datasheet.pdf)