# SMBJ30A

**hongjiacheng** · ESD And Surge Protection (TVS/ESD) · DO-214AA(SMB)

SMBJ30A from hongjiacheng, in a DO-214AA(SMB). 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 terminal, marked by the cathode band on the unidirectional SMBJ30A, which connects to the protected line (positive side) and has VRWM 30.0 V, VBR 33.30 to 36.80 V at 1 mA, and VC 48.4 V at IPP 12.40 A. |
| 2 | A | passive | Anode terminal at the end opposite the cathode band, which connects to ground or the return side, and the unidirectional device has VF of 3.5 V at 25 A (VF 3.5/5.0 V per the ratings table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | hongjiacheng |
| Package | DO-214AA(SMB) |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `SMBJ30A`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: DO-214AA(SMB) (KiCad packages3D, STEP)
- 3D model files: `smbj30a-etched.step` / `smbj30a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj30a.step` / `smbj30a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [hongjiacheng datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8756497656158007296) (5 pp, sha256 `a983fd4d2da94c77`, retrieved 2026-10-12, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-5-5` (text+vision), consensus `claude-opus-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/smbj30a-datasheet.pdf)