# BZX84C20LT1G

**onsemi** · Zener Diodes · SOT-23

BZX84C20LT1G from onsemi, 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 | Zener diode anode; the datasheet gives the pinout as 1-Anode, 2-No Connection, 3-Cathode for this SOT-23 device. |
| 2 | NC | unconnected | No connection on the SOT-23 Style 8 outline; the datasheet pinout lists pin 2 as No Connection. |
| 3 | Cathode | passive | Zener diode cathode, identified on the package by the polarity band. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| 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 |
|---|---|---|---|---|---|---|---|
| Reverse Zener Voltage @ IZT1 (Min) | VZ1 | 18.8 | 20 | 21.2 | V | @ IZT1 = 5 mA (Note 3) | 3 |
| Maximum Zener Impedance @ IZT1 | ZZT1 |  |  | 55 | Ω | @ IZT1 = 5 mA (Note 3) | 3 |
| Reverse Zener Voltage @ IZT2 (Min/Max) | VZ2 | 18.7 |  | 21.1 | V | @ IZT2 = 1 mA (Note 3) | 3 |
| Maximum Zener Impedance @ IZT2 | ZZT2 |  |  | 225 | Ω | @ IZT2 = 1 mA (Note 3) | 3 |
| Reverse Zener Voltage @ IZT3 (Min/Max) | VZ3 | 18.9 |  | 21.4 | V | @ IZT3 = 20 mA (Note 3) | 3 |
| Maximum Zener Impedance @ IZT3 | ZZT3 |  |  | 20 | Ω | @ IZT3 = 20 mA (Note 3) | 3 |
| Max Reverse Leakage Current | IR |  |  | 0.05 | µA | @ VR = 14 V | 3 |
| Maximum Temperature Coefficient of VZ (Min) | VZ | 14.4 |  | 18 | mV/k | @ IZT1 = 5 mA | 3 |
| Max Capacitance | C |  |  | 85 | pF | @ VR = 0, f = 1 MHz | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 3 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 250 | mW | @ TA = 25°C, FR-5 board (Note 1) | 2 |
| Derating above 25°C (FR-5 Board) | PD |  |  | 2 | mW/°C | Derated above 25°C, FR-5 board (Note 1) | 2 |
| Thermal Resistance, Junction-to-Ambient (FR-5 Board) | RθJA |  |  | 500 | °C/W | FR-5 board (Note 1) | 2 |
| Total Power Dissipation on Alumina Substrate | PD |  |  | 300 | mW | @ TA = 25°C, alumina substrate (Note 2) | 2 |
| Derating above 25°C (Alumina Substrate) | PD |  |  | 2.4 | mW/°C | Derated above 25°C, alumina substrate (Note 2) | 2 |
| Thermal Resistance, Junction-to-Ambient (Alumina Substrate) | RθJA |  |  | 417 | °C/W | Alumina substrate (Note 2) | 2 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `BZX84C20LT1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `bzx84c20lt1g-etched.step` / `bzx84c20lt1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `bzx84c20lt1g.step` / `bzx84c20lt1g.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [onsemi datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589998914595155968) (8 pp, sha256 `e8ae0892f00a3794`, 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/bzx84c20lt1g-datasheet.pdf)