# SMAJ30A-JSM

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

SMAJ30A-JSM from JSMSEMI, 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 | Cathode | passive | Cathode terminal of the unipolar SMAJ TVS diode; the device is rated 400W peak pulse power and -55 to +150 °C junction and storage temperature. |
| 2 | Anode | passive | Anode terminal of the unipolar SMAJ TVS diode; the device is rated 400W peak pulse power and -55 to +150 °C junction and storage temperature. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | JSMSEMI |
| Package | SMA |
| 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 |
|---|---|---|---|---|---|---|---|
| Peak power dissipation with a 10/1000μs waveform | PPPM | 400 |  |  | W | 10/1000μs waveform, Note *1 (FIG.1) | 1 |
| Breakdown voltage | VBR | 33.3 |  | 36.8 | V | @ IT = 1 mA | 2 |
| Reverse standoff voltage | VRWM |  |  | 30 | V |  | 2 |
| Max. peak pulse current | IPP_MAX |  |  | 8.3 | A |  | 2 |
| Max. clamping voltage | VC_MAX |  |  | 48.4 | V | @ IPP | 2 |
| Typical thermal resistance, junction to ambient | RθJA |  | 70 |  | °C/W | Device mounted on p.c.b. with 10 mm x 20 mm x 0.1 mm copper pad area (Note *2) | 1 |
| Typical thermal resistance, junction to case | RθJC |  | 25 |  | °C/W |  | 1 |
| Typical thermal resistance, junction to lead | RθJL |  | 30 |  | °C/W |  | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SMAJ30A-JSM`
- Footprint: `Diode_SMD:D_SMA`
- 3D model: SMA (KiCad packages3D, STEP)
- 3D model files: `smaj30a-jsm-etched.step` / `smaj30a-jsm-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smaj30a-jsm.step` / `smaj30a-jsm.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [JSMSEMI datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604425104734633984) (5 pp, sha256 `070cf4c2f9c4dec1`, retrieved 2026-10-14, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-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/smaj30a-jsm-datasheet.pdf)