# SZBZX84C12ET1G

**onsemi** · Zener Diodes · SOT-23-3

SZBZX84C12ET1G from onsemi, in a SOT-23-3. 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 datasheet gives no pin-specific electrical limits, only device ratings of 250 mW total power on an FR-5 board and junction/storage temperature of −65 °C to +150 °C. |
| 2 | NO CONNECTION | unconnected | Pin 2 is not connected internally and is not used in the Zener regulator circuit. |
| 3 | CATHODE | passive | Cathode terminal of the Zener diode, indicated by the polarity band on the package; the datasheet gives no pin-specific electrical limits for this terminal. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOT-23-3 |
| 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/nom/max) | VZ1 | 11.4 | 12 | 12.7 | V | @ IZT1 = 5 mA (Note 4) | 3 |
| Maximum Zener Impedance ZZT1 | ZZT1 |  |  | 25 | Ω | @ IZT1 = 5 mA | 3 |
| Reverse Zener Voltage VZ2 (min/max) | VZ2 | 11.2 |  | 12.7 | V | @ IZT2 = 1 mA (Note 4) | 3 |
| Maximum Zener Impedance ZZT2 | ZZT2 |  |  | 150 | Ω | @ IZT2 = 1 mA | 3 |
| Reverse Zener Voltage VZ3 (min/max) | VZ3 | 11.4 |  | 12.9 | V | @ IZT3 = 20 mA (Note 4) | 3 |
| Maximum Zener Impedance ZZT3 | ZZT3 |  |  | 10 | Ω | @ IZT3 = 20 mA | 3 |
| Reverse Leakage Current IR | IR |  |  | 0.1 | µA | @ VR = 8.0 V | 3 |
| Maximum Temperature Coefficient of VZ | VZ | 6 |  | 10 | mV/k | @ IZT1 = 5 mA | 3 |
| Maximum Capacitance | C |  |  | 130 | pF | @ VR = 0 V, f = 1 MHz | 3 |
| Forward Voltage | VF |  |  | 0.9 | V | @ IF = 10 mA | 2 |
| Peak Power Dissipation | Ppk |  |  | 225 | W | @ 20 s (Note 1), TL ≤ 25°C | 1 |
| Total Power Dissipation on FR-5 Board | PD |  |  | 250 | mW | @ TA = 25°C (Note 2) | 1 |
| Derating above 25°C, FR-5 Board | PD |  | 2 |  | mW/°C | Derated above 25°C, FR-5 board (Note 2) | 1 |
| Thermal Resistance, Junction-to-Ambient, FR-5 Board | RθJA |  |  | 500 | °C/W | FR-5 board (Note 2) | 1 |
| Total Power Dissipation on Alumina Substrate | PD |  |  | 300 | mW | @ TA = 25°C (Note 3) | 1 |
| Derating above 25°C, Alumina Substrate | PD |  | 2.4 |  | mW/°C | Derated above 25°C, alumina substrate (Note 3) | 1 |
| Thermal Resistance, Junction-to-Ambient, Alumina Substrate | RθJA |  |  | 417 | °C/W | alumina substrate (Note 3) | 1 |
| Junction and Storage Temperature Range | TJ, Tstg | -65 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SZBZX84C12ET1G`
- Footprint: `Package_TO_SOT_SMD:SOT-23-3`
- 3D model: SOT-23-3 (KiCad packages3D, STEP)
- 3D model files: `szbzx84c12et1g-etched.step` / `szbzx84c12et1g-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `szbzx84c12et1g.step` / `szbzx84c12et1g.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/8603034560254914560) (7 pp, sha256 `f2b6d88b8e3f13ae`, retrieved 2026-10-17, 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/szbzx84c12et1g-datasheet.pdf)