# BZT52-B18S_R1_00001

**PANJIT International** · Zener Diodes · SOD-323

BZT52-B18S_R1_00001 from PANJIT International, 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 | Cathode | passive | Cathode of the Zener diode (marked pin 1 in the SOD-323 outline); BZT52-B18S has 18 V nominal Zener voltage (17.64 to 18.36 V) at 5.0 mA. |
| 2 | A | passive | Anode of the Zener diode (pin 2 in the SOD-323 outline); power dissipation is 200 mW at TA=25°C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | PANJIT International |
| 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 (nominal) | VZ | 17.64 | 18 | 18.36 | V | IZT = 5.0 mA | 2 |
| Max Zener Impedance | ZZT |  |  | 50 | Ω | IZT = 5.0 mA | 2 |
| Max Zener Impedance (knee) | ZZK |  |  | 225 | Ω | IZK = 1.00 mA | 2 |
| Max Reverse Leakage Current | IR |  |  | 0.1 | μA | VR = 14.0 V | 2 |
| Power Dissipation | PD |  |  | 200 | mW | TA=25°C, FR-4 PCB, 100cm2 copper pad | 1 |
| Typical Thermal Resistance | RθJA |  | 650 |  | °C/W | FR-4 PCB, single-sided copper, mini pad | 1 |
| Operating Junction and Storage Temperature Range | TJ | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `BZT52-B18S_R1_00001`
- Footprint: `Diode_SMD:D_SOD-323`
- 3D model: SOD-323 (KiCad packages3D, STEP)
- 3D model files: `bzt52-b18s-r1-00001-etched.step` / `bzt52-b18s-r1-00001-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzt52-b18s-r1-00001.step` / `bzt52-b18s-r1-00001.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [PANJIT International datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588902670220873728) (6 pp, sha256 `953b9bc7b6a069ae`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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-b18s-r1-00001-datasheet.pdf)