# PSR05-MS

**MSKSEMI** · ESD And Surge Protection (TVS/ESD) · SOT-143

PSR05-MS from MSKSEMI, in a SOT-143. 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 | GND | power_in | Ground reference, connected to the anode of the internal 5V (VRWM) TVS diode and the lower steering-diode rail. |
| 2 | I/O | passive | Protected line connection to the steering-diode midpoint, clamping ESD up to ±15kV air and ±8kV contact per IEC 61000-4-2. |
| 3 | I/O | passive | Protected line connection to the steering-diode midpoint, clamping ESD up to ±15kV air and ±8kV contact per IEC 61000-4-2. |
| 4 | VCC | power_in | Upper steering-diode rail, connected to the cathode of the internal TVS diode with VRWM of 5V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | MSKSEMI |
| Package | SOT-143 |
| Category | Circuit Protection |
| Pins | 4 |

## CAD (KiCad official)

- Symbol: `PSR05-MS`
- Footprint: `Package_TO_SOT_SMD:SOT-143`
- 3D model: SOT-143 (KiCad packages3D, STEP)
- 3D model files: `psr05-ms-etched.step` / `psr05-ms-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `psr05-ms.step` / `psr05-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/8590184439428259840) (5 pp, sha256 `c56100f4153e16b6`, 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/psr05-ms-datasheet.pdf)