# SMAJ75A

**WPMtek(Wei Pan Microelectronics)** · ESD And Surge Protection (TVS/ESD) · SMA(DO-214AC)

SMAJ75A from WPMtek(Wei Pan Microelectronics), 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 | WPMtek(Wei Pan Microelectronics) |
| 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 |
|---|---|---|---|---|---|---|---|
| Stand-off voltage | VR |  |  | 75 | V | Unidirectional SMAJ75A; maximum voltage that can be applied | 3 |
| Reverse leakage current | IR |  |  | 1 | μA | @ VR = 75.0 V | 3 |
| Breakdown voltage | VBR | 83.3 |  | 92.1 | V | @ IT = 1 mA | 3 |
| Clamping voltage | VC |  |  | 121 | V | @ IPP = 3.3 A, surge waveform 10/1000μs | 3 |
| Storage temperature range | Tstg | -55 |  | 150 | ℃ |  | 4 |
| Operating junction temperature range | Tj | -55 |  | 150 | ℃ |  | 4 |
| Steady state power dissipation | PM(AV) |  |  | 3.3 | W | at TL=75℃ | 4 |
| Peak pulse power dissipation | PPP |  |  | 400 | W | 10/1000μs waveform | 4 |
| Maximum instantaneous forward voltage | VF |  |  | 5 | V | at 30A for unidirectional | 4 |

## CAD (KiCad official)

- Symbol: `SMAJ75A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `smaj75a-etched.step` / `smaj75a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj75a.step` / `smaj75a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [WPMtek(Wei Pan Microelectronics) datasheet](docs/smaj75a-datasheet.pdf) (6 pp, sha256 `73f81d8cee794e11`, 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/smaj75a-datasheet.pdf)