# KBTR04D3

**KUU** · Varistors · 0402

KBTR04D3 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 | One terminal electrode of the bidirectional chip varistor (Ag with Ni-Sn plating); max working voltage 18.0 VDC / 12.7 VAC RMS, varistor voltage 31.0-38.0 V at 1 mA DC. |
| 2 | 2 | passive | Second terminal electrode of the chip varistor, interchangeable with the first; max clamping voltage 58 V (8/20 µs) and 70 V (ESD), peak current 1 A (8/20 µs). |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `KBTR04D3`
- Footprint: `Resistor_SMD:R_0402_1005Metric`
- 3D model: 0402 (KiCad packages3D, STEP)
- 3D model files: `kbtr04d3-etched.step` / `kbtr04d3-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `kbtr04d3.step` / `kbtr04d3.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/8589041951270449152) (5 pp, sha256 `688b29d27f772bfa`, 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/kbtr04d3-datasheet.pdf)