# KPESD0402-05ST

**KUU** · ESD And Surge Protection (TVS/ESD) · 0402

KPESD0402-05ST from KUU, in a 0402. 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 | 1 | passive | Terminal 1 of the bidirectional single-line ESD protection diode; connect to the protected signal line, as close to the connector as possible (polarity is not specified; the device is symmetric). |
| 2 | 2 | passive | Terminal 2 of the bidirectional single-line ESD protection diode; connect to ground or the other side of the protected line (polarity is not specified; the device is symmetric), with continuous operating voltage up to 5.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | KUU |
| Package | 0402 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `KPESD0402-05ST`
- Footprint: `Diode_SMD:D_0402_1005Metric`
- 3D model: 0402, generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.4 mm nominal _0402_ height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files: `kpesd0402-05st-etched.step` / `kpesd0402-05st-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kpesd0402-05st.step` / `kpesd0402-05st.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [KUU datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8757284497019166720) (5 pp, sha256 `a640cb1f480ad325`, retrieved 2026-10-09, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+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/kpesd0402-05st-datasheet.pdf)