# SMBJ250A

**LGE** · TVS · SMB(DO-214AA)

SMBJ250A from LGE, 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, marked by the color band on the unidirectional SMBJ250A (VRWM 250 V, VBR 279-309 V at 1 mA, 600 W peak pulse power). |
| 2 | A | passive | Anode terminal at the end opposite the color band; the unidirectional SMBJ250A clamps at 405 V max at IPP 1.48 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LGE |
| 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 | 279 |  | 309 | V | @IT = 1 mA | 3 |
| Test Current | IT |  | 1 |  | mA |  | 3 |
| Working Peak Reverse Voltage | VRWM |  | 250 |  | V |  | 3 |
| Maximum Reverse Leakage | IR |  |  | 1 | uA | @VRWM | 3 |
| Maximum Clamping Voltage | VC |  |  | 405 | V | @IPP | 3 |
| Maximum Reverse Surge Current | IPP |  |  | 1.48 | A | 10/1000 µs waveform | 3 |
| Peak power dissipation | PPP |  |  | 600 | W | 10/1000µs waveform | 1 |
| Peak forward surge current | IFSM |  |  | 100 | A | 8.3 ms single half sine-wave, unidirectional only | 1 |
| Power dissipation on infinite heatsink | PD |  |  | 5 | W | TL = 75 °C | 1 |
| Maximum instantaneous forward voltage | VF |  |  | 5 | V | at 50 A, unidirectional only, VBR>201V | 1 |
| Operating junction and storage temperature range | TJ, TSTG | -55 |  | 150 | °C |  | 1 |

## CAD (KiCad official)

- Symbol: `SMBJ250A`
- Footprint: `Diode_SMD:D_SMB`
- 3D model: SMB(DO-214AA) (KiCad packages3D, STEP)
- 3D model files: `smbj250a-etched.step` / `smbj250a-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `smbj250a.step` / `smbj250a.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LGE datasheet](docs/smbj250a-datasheet.pdf) (4 pp, sha256 `3c4e7a572b79a220`, 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/smbj250a-datasheet.pdf)