# SA45A

**Brightking** · ESD And Surge Protection (TVS/ESD) · DO-15

SA45A from Brightking, in a DO-15. 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 axial lead on the color-band side of the unidirectional SA45A (VRWM 45.0 V, VBR 50.00~55.30 V at 1 mA, VC 72.7 V at 7.0 A IPP). |
| 2 | A | passive | Anode, the axial lead opposite the cathode band; it is the lead that goes negative relative to the cathode in normal use, with the diode clamping in reverse breakdown (IR 1 µA max at VRWM 45.0 V). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Brightking |
| Package | DO-15 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `SA45A`
- Footprint: `Diode_THT:D_DO-15_P12.70mm_Horizontal`
- 3D model: DO-15 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [Brightking datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588892781507330048) (6 pp, sha256 `f0dc01ead7acea2f`, retrieved 2026-10-13, 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/sa45a-datasheet.pdf)