# SMBJ43A-AT

**Brightking Elec (TAIWAN)** · TVS · SMB(DO-214AA)

SMBJ43A-AT from Brightking Elec (TAIWAN), in a SMB(DO-214AA). 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, identified by the color band on the unidirectional SMBJ43A-AT (43 V VRWM, 47.80~52.80 V VBR at 1 mA, 69.4 V max VC at 8.7 A IPP). |
| 2 | A | passive | Anode terminal of the unidirectional SMBJ43A-AT, which sits opposite the cathode band end and carries the 600 W 10/1000μs peak pulse rating. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Brightking Elec (TAIWAN) |
| Package | SMB(DO-214AA) |
| 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 | 47.8 |  | 52.8 | V | @IT=1mA | 3 |
| Maximum Clamping Voltage | VC |  |  | 69.4 | V | @IPP=8.7A | 3 |
| Reverse Leakage | IR |  |  | 1 | μA | @VRWM=43V | 3 |
| Peak Pulse Current | IPP |  |  | 8.7 | A | 10/1000μs waveform | 3 |
| Peak pulse power dissipation | PPPM | 600 |  |  | Watts | 10/1000μs waveform, Minimum | 1 |
| Steady state power dissipation | PM(AV) |  |  | 5 | Watts | TA=50℃ | 1 |
| Peak forward surge current | IFSM |  |  | 100 | Amps | 8.3ms single half sine-wave superimposed on rated load, JEDEC Method | 1 |
| Operating junction and storage temperature | TJ,TSTG | -55 |  | 150 | ℃ |  | 1 |
| Reverse Stand-Off Voltage | VRWM |  | 43 |  | V |  | 3 |
| Thermal resistance junction to lead | RθJL |  | 20 |  | ℃/W | Typical | 1 |
| Thermal resistance junction to ambient | RθJA |  | 100 |  | ℃/W | Typical | 1 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | 2. Mounted on 5.0mm×5.0mm (0.03mm thick) copper pads to each terminal. | 1 |

## CAD (KiCad official)

- Symbol: `SMBJ43A-AT`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files: `smbj43a-at-etched.step` / `smbj43a-at-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj43a-at.step` / `smbj43a-at.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [Brightking Elec (TAIWAN) datasheet](docs/smbj43a-at-datasheet.pdf) (7 pp, sha256 `a2bc93a3b45c5e72`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/smbj43a-at-datasheet.pdf)