# P4SMA20A

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

P4SMA20A from MSKSEMI, in a SMA. 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 | K | passive | Cathode terminal of the unidirectional TVS, marked by the cathode band on the package, for a 17.10V reverse stand-off voltage (VRWM) and 19.00~21.00V breakdown voltage at 1mA. |
| 2 | A | passive | Anode terminal of the unidirectional TVS (no band), which clamps at a maximum of 27.7V at 14.8A peak pulse current. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `P4SMA20A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `p4sma20a-etched.step` / `p4sma20a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `p4sma20a.step` / `p4sma20a.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/8600631709079511040) (9 pp, sha256 `ec1f092bdee4a124`, retrieved 2026-10-13, 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/p4sma20a-datasheet.pdf)