1500W surge clamp for 24V automotive rails
The 1.5KE36AH is a 1500W peak-pulse-power TVS diode from Taiwan Semiconductor's 1.5KE series, designed to clamp transients on 24V automotive power buses. Its 30.8V reverse standoff voltage sits above the nominal 24V rail, so it does not conduct during normal operation, but the 34.2V minimum breakdown triggers fast when a load-dump or alternator surge hits. For an ECU or sensor module on a 24V truck or bus platform, the 1.5KE36AH absorbs the 31A peak pulse current (10/1000 µs waveform) and clamps it to 49.9V max, keeping downstream silicon inside its safe operating area.
Package and board-fit reality
The DO-201AA (DO-27) axial-lead package is a through-hole form factor — it needs a drilled hole in the PCB, not a surface-mount pad. The DO-201 body is the same diameter as the smaller DO-15 but longer, so the lead spacing and hole diameter (typically 1.0 mm) must match the board layout. The copper tab on the cathode side is the primary heat path; a generous copper pour on the anode-side pad lowers the thermal resistance to the board. Tape-and-reel packaging is specified, which is unusual for a through-hole axial part — it tells you this diode ships on a bandolier for automated insertion, not loose in a bag. The reel quantity is not listed here, but the tape-and-reel format means the leads are pre-formed and the body orientation is consistent for a radial or axial inserter.