What the key ratings mean for your BOM
The 1.5KE15A R0G: For a 12.8V standoff rail, this translates to a peak current capability of 74A — sufficient for industrial transient protection per IEC 61000-4-5 where the 8/20µs waveform is also common, though the 10/1000µs rating is more conservative. If the downstream device's absolute maximum rating is below this, a lower-clamping TVS or additional filtering is needed. No power derating is required until ambient exceeds 25°C, but above that the peak pulse power must be reduced per the datasheet derating curve.
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE15A R0G is a through-hole part suited for point-to-point wiring or PCB mounting with 0.042-inch diameter lead holes on a 0.375-inch lead spacing. The axial body allows vertical or horizontal mounting depending on board layout constraints.
The 1.5KE series includes multiple voltage variants, but the 1.5KE15A is the specific 15V unidirectional version in this package.