# ESD5Z12

**YFW** · ESD And Surge Protection (TVS/ESD) · SOD-523

ESD5Z12 from YFW, in a SOD-523. 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 ESD5Z12 TVS diode, marked as pin 1 in the simplified SOD-523 outline; the device has a working peak reverse voltage (VRWM) of 12.0 V max and a breakdown voltage (VBR) of 13.3 V min at IT = 1 mA. |
| 2 | Anode | passive | Anode of the ESD5Z12 TVS diode, marked as pin 2 in the simplified SOD-523 outline; the maximum reverse leakage current is 1.0 µA at VRWM = 5 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | YFW |
| Package | SOD-523 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `ESD5Z12`
- Footprint: `Diode_SMD:D_SOD-523`
- 3D model: SOD-523 (KiCad packages3D, STEP)
- 3D model files: `esd5z12-etched.step` / `esd5z12-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `esd5z12.step` / `esd5z12.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [YFW datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603377347567632384) (5 pp, sha256 `640293ee4b42c026`, retrieved 2026-10-16, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (vision), consensus `claude-opus-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/esd5z12-datasheet.pdf)