# MS0603ESDA-18

**MSKSEMI** · ESD And Surge Protection (TVS/ESD) · 0603

MS0603ESDA-18 from MSKSEMI, in a 0603. 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 end termination (Ag/Ni/Sn) of the non-polarized ZnO varistor, rated for 18 V maximum continuous DC working voltage per the MS0603ESDA-XX series naming (VDC 18V). |
| 2 | 2 | passive | Other end termination (Ag/Ni/Sn) of the non-polarized ZnO varistor, interchangeable with the first terminal and 0.35±0.15 mm long. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | 0603 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `MS0603ESDA-18`
- Footprint: `Diode_SMD:D_0603_1608Metric`
- 3D model: 0603 (KiCad packages3D, STEP)
- 3D model files: `ms0603esda-18-etched.step` / `ms0603esda-18-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ms0603esda-18.step` / `ms0603esda-18.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [MSKSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8552838755124719616) (6 pp, sha256 `63ddd415519f768a`, 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/ms0603esda-18-datasheet.pdf)