# P4SMA440A

**Littelfuse** · ESD And Surge Protection (TVS/ESD) · DO-214AC

P4SMA440A from Littelfuse, in a DO-214AC. 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: the banded/marked end per the datasheet; pad 1 of the KiCad diode footprint. |
| 2 | A | passive | Anode. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Littelfuse |
| Package | DO-214AC |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `P4SMA440A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: DO-214AC (KiCad packages3D, STEP)
- 3D model files: `p4sma440a-etched.step` / `p4sma440a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `p4sma440a.step` / `p4sma440a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Littelfuse datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590222125807136768) (6 pp, sha256 `852b4d7b8018f3b1`, retrieved 2026-10-13, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins`, primary `cathode-band convention` (convention), consensus `off` (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/p4sma440a-datasheet.pdf)