# PESD0402MS09-MS

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

PESD0402MS09-MS from MSKSEMI, 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 of the bi-directional single-line ESD protection diode, connected to the protected signal line; rated for 9 V continuous operating voltage (VDC) and 8 kV contact / 15 kV air IEC 61000-4-2 discharge. |
| 2 | 2 | passive | Second terminal of the bi-directional single-line ESD protection diode, interchangeable with the other terminal and connected to ground or the return side; rated for 9 V continuous operating voltage (VDC). |

## Key specifications

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

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| ESD Electrostatic Discharge Voltage (contact discharge) | VESD |  |  | 8 | V | IEC 61000-4-2; Contact Discharge | 3 |
| ESD Electrostatic Discharge Voltage (air discharge) | VESD |  |  | 15 | V | IEC 61000-4-2; Air Discharge | 3 |
| Operating Temperature Range | TA | -55 |  | 125 | ℃ |  | 3 |
| Storage Temperature Range | Tstg | -40 |  | 85 | ℃ |  | 3 |
| Continuous Operating Voltage | VDC |  |  | 9 | V |  | 3 |
| Leakage Current | IL |  |  | 10 | nA | DC 9V shall be applied on component | 3 |

## CAD (KiCad official)

- Symbol: `PESD0402MS09-MS`
- 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: `pesd0402ms09-ms-etched.step` / `pesd0402ms09-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `pesd0402ms09-ms.step` / `pesd0402ms09-ms.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/8603082891916701696) (6 pp, sha256 `b4a8d4c1162021db`, retrieved 2026-10-18, 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/pesd0402ms09-ms-datasheet.pdf)