# 1.5KE550CA

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

1.5KE550CA 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 | A1 | passive | Bidirectional TVS terminal 1 (axial lead, no polarity band on the CA suffix part); 1500 W peak pulse power with 10/1000 µs waveform, VRWM 470.3 V and VBR 522.5 to 577.5 V for the 1.5KE550CA. |
| 2 | A2 | passive | Bidirectional TVS terminal 2 (axial lead, interchangeable with the other terminal); maximum clamping voltage 759.0 V at IPP 1.98 A for the 1.5KE550CA. |

## Key specifications

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

## CAD (KiCad official)

- Symbol: `1.5KE550CA`
- 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/8588891151621632000) (4 pp, sha256 `332c6c4e0f3105ca`, 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/1-5ke550ca-datasheet.pdf)