# 1.5KE51A

**DOWO** · ESD And Surge Protection (TVS/ESD) · DO-201

1.5KE51A from DOWO, in a DO-201. 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 end of the unidirectional 1.5KE51A, marked by the color band; the datasheet gives a 48.45 to 53.55 V breakdown voltage and 43.6 V working peak reverse voltage. |
| 2 | A | passive | Anode lead at the end opposite the color band; the datasheet gives a 1500 W peak pulse power rating with a 10/1000 μs waveform and 70.1 V maximum clamping voltage at 21.40 A. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | DOWO |
| Package | DO-201 |
| Category | Circuit Protection |
| Pins | 2 |

## CAD (KiCad official)

- Symbol: `1.5KE51A`
- Footprint: `Diode_THT:D_DO-201AD_P15.24mm_Horizontal`
- 3D model: DO-201 (KiCad packages3D, STEP)

## Provenance

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

- **Datasheet:** [DOWO datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590298898855063552) (4 pp, sha256 `f0f46eb9677ba9d9`, 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/1-5ke51a-datasheet.pdf)