# P4SMA18A

**Slkor(SLKORMICRO Elec.)** · ESD And Surge Protection (TVS/ESD) · SMA(DO-214AC)

P4SMA18A from Slkor(SLKORMICRO Elec.), in a SMA(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 | Slkor(SLKORMICRO Elec.) |
| Package | SMA(DO-214AC) |
| 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 |
|---|---|---|---|---|---|---|---|
| Breakdown voltage (min) | VBR | 17.1 |  |  | V | @ IT = 1 mA | 2 |
| Breakdown voltage (max) | VBR |  |  | 18.9 | V | @ IT = 1 mA | 2 |
| Stand-off voltage (unidirectional) | VR |  |  | 15.3 | V | Unidirectional (P4SMA18A) | 2 |
| Reverse leakage current | IR |  | 1 |  | μA | @ VR (IR@VR column) | 2 |
| Clamping voltage | VC |  | 25.2 |  | V | @ IPP = 16.1 A, surge 10/1000μs | 2 |
| Peak pulse power dissipation | PPP |  |  | 400 | W | 10/1000μs waveform | 4 |
| Steady state power dissipation | PM(AV) |  |  | 3.3 | W | at TL = 75℃ | 4 |
| Maximum instantaneous forward voltage | VF |  |  | 5 | V | at 30 A for unidirectional | 4 |
| Storage temperature range | Tstg | -55 |  | 150 | ℃ |  | 4 |
| Operating junction temperature range | Tj | -55 |  | 150 | ℃ |  | 4 |

## CAD (KiCad official)

- Symbol: `P4SMA18A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `p4sma18a-etched.step` / `p4sma18a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `p4sma18a.step` / `p4sma18a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Slkor(SLKORMICRO Elec.) datasheet](docs/p4sma18a-datasheet.pdf) (6 pp, sha256 `c6625dafecde1e3c`, retrieved 2026-10-21, 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/p4sma18a-datasheet.pdf)