Surge protection with a known clamping ceiling
The 1.5KE150A: The single unidirectional channel means it protects one polarity line against positive transients; for bidirectional or AC-line clamping, a pair or a bidirectional variant from the same family would be needed.
Package and thermal design for through-hole assembly
Housed in a DO-201AA (DO-27) axial-lead package, the 1.5KE150A mounts through-hole on a PCB or terminal block. The junction operates from -55°C to 175°C, covering industrial and automotive under-hood ambient temperatures without derating at the lower end — at high ambient, the 1500 W rating assumes adequate lead-length and copper-pad heat sinking per the datasheet derating curve. The axial leads allow hand or wave soldering; the package body is non-hermetic but the junction is passivated, so standard conformal coating is sufficient for humid environments.