# SMAJ85A

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

SMAJ85A from FOSAN, 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 | FOSAN |
| 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 VBR (min) | VBR | 94.4 |  |  | V | @ IT = 1 mA (SMAJ85A, unidirectional) | 2 |
| Breakdown voltage VBR (max) | VBR |  |  | 108.2 | V | @ IT = 1 mA (SMAJ85A, unidirectional) | 2 |
| Peak Power Dissipation | PPK |  |  | 400 | W |  | 1 |
| Peak Forward Surge Current (UNI) | IFSM |  |  | 40 | A |  | 1 |
| Forward Voltage (UNI) | VF |  |  | 3.5 | V | IF=25A | 1 |
| Thermal Resistance Junction-Ambient | RθJA |  | 30 |  | ℃/W |  | 1 |
| Junction/Storage Temperature | TJ,Tstg | -55 |  | 150 | ℃ |  | 1 |

## CAD (KiCad official)

- Symbol: `SMAJ85A`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA(DO-214AC) (KiCad packages3D, STEP)
- 3D model files: `smaj85a-etched.step` / `smaj85a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj85a.step` / `smaj85a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [FOSAN datasheet](docs/smaj85a-datasheet.pdf) (4 pp, sha256 `4231bdc278871470`, 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/smaj85a-datasheet.pdf)