# SZBZX84C12LT3G

**onsemi** · Zener Diodes · SOT-23

SZBZX84C12LT3G 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 | Anode terminal of the Zener diode; the cathode is the pin marked by the polarity band on the package. |
| 2 | NC | unconnected | Listed as No Connection in the pinout (Style 8), so it has no electrical function on this device. |
| 3 | CATHODE | passive | Cathode terminal of the Zener diode, which is the reverse-biased regulating terminal and is indicated 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 (VZ1), min | VZ | 11.4 | 12 | 12.7 | V | @ IZT1 = 5 mA (Note 3) | 3 |
| Maximum Zener Impedance (ZZT1) | ZZT |  |  | 25 | Ω | @ IZT1 = 5 mA (Note 3) | 3 |
| Reverse Zener Voltage (VZ2) | VZ | 11.2 |  | 12.7 | V | @ IZT2 = 1 mA (Note 3) | 3 |
| Maximum Zener Impedance (ZZT2) | ZZT |  |  | 150 | Ω | @ IZT2 = 1 mA (Note 3) | 3 |
| Reverse Zener Voltage (VZ3) | VZ | 11.4 |  | 12.9 | V | @ IZT3 = 20 mA (Note 3) | 3 |
| Maximum Zener Impedance (ZZT3) | ZZT |  |  | 10 | Ω | @ IZT3 = 20 mA (Note 3) | 3 |
| Reverse Leakage Current | IR |  |  | 0.1 | µA | @ VR = 8 V | 3 |
| Maximum Temperature Coefficient of VZ | VZ | 6 |  | 10 | mV/k | @ IZT1 = 5 mA | 3 |
| Max Capacitance | C |  |  | 130 | pF | @ VR = 0, f = 1 MHz | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 2 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 250 | mW | @ TA = 25°C (Note 1) | 2 |
| Derating above 25°C, FR-5 Board | PD |  |  | 2 | mW/°C | Derated above 25°C (Note 1) | 2 |
| Thermal Resistance, Junction-to-Ambient, FR-5 Board | RJA |  |  | 500 | °C/W | Note 1 | 2 |
| Total Power Dissipation on Alumina Substrate | PD |  |  | 300 | mW | @ TA = 25°C (Note 2) | 2 |
| Derating above 25°C, Alumina Substrate | PD |  |  | 2.4 | mW/°C | Derated above 25°C (Note 2) | 2 |
| Thermal Resistance, Junction-to-Ambient, Alumina Substrate | RJA |  |  | 417 | °C/W | Note 2 | 2 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 2 |

## CAD (KiCad official)

- Symbol: `SZBZX84C12LT3G`
- Footprint: `Package_TO_SOT_SMD:SOT-23`
- 3D model: SOT-23 (KiCad packages3D, STEP)
- 3D model files: `szbzx84c12lt3g-etched.step` / `szbzx84c12lt3g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szbzx84c12lt3g.step` / `szbzx84c12lt3g.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/8589992838600417280) (9 pp, sha256 `3cfd93f687d426fd`, 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/szbzx84c12lt3g-datasheet.pdf)