# BZX84C51

**LGE** · Zener Diodes · SOT-23

BZX84C51 from LGE, in a SOT-23. 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 | ANODE | passive | Anode terminal of the zener diode, labelled ANODE on the datasheet pin drawing; the device is rated 350 mW power dissipation at Ta=25°C. |
| 2 | NC | unconnected | The extracted text gives no function for pin 2 beyond a stray '2' after the ANODE label, so its role could not be confirmed from the text and should be checked against the package drawing. |
| 3 | CATHODE | passive | Cathode terminal of the zener diode, labelled cathode on the datasheet pin drawing; operating and storage temperature range is -65 to +150 °C. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| Package | SOT-23 |
| 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 |
|---|---|---|---|---|---|---|---|
| Zener voltage | VZ | 48 | 51 | 54 | V | IZT = 2.0 mA | 3 |
| Maximum Zener impedance | ZZT |  |  | 180 | Ω | @IZT = 2.0 mA | 3 |
| Maximum Zener impedance (knee) | ZZK |  |  | 400 | Ω | @IZK = 0.5 mA | 3 |
| Maximum reverse current | IR |  |  | 0.1 | μA | VR = 35.7 V | 3 |
| Typical temperature coefficient |  | 10 |  | 12 | mV/℃ | @IZT = 2.0 mA | 3 |
| Zener voltage tolerance (C suffix) |  | -5 |  | 5 | % | C: 5% tolerance | 1 |
| Power dissipation | Pd |  |  | 350 | mW |  | 1 |
| Forward voltage | VF |  |  | 0.9 | V | IF = 10 mA | 1 |
| Thermal resistance, junction to ambient air | RθjA |  |  | 357 | ℃/W |  | 1 |
| Operating and storage temperature range | Tj，Tstg | -65 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `BZX84C51`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c51-etched.step` / `bzx84c51-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c51.step` / `bzx84c51.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LGE datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588917963336794112) (5 pp, sha256 `dda47b12c5cd081b`, retrieved 2026-10-19, 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/bzx84c51-datasheet.pdf)