AEC-Q101 qualification and the 175°C junction ceiling
The 1.5KE30CAHB0G: The -55°C to 175°C operating junction range covers under-hood ambient plus self-heating during a pulse — at 175°C the leakage current rises, but the clamping voltage stays within the 41.4V maximum at 38A peak pulse current. That 38A figure is the current the diode shunts at the 10/1000µs test pulse; real-world transients shorter than 1ms allow higher peak current before the junction temperature limit is reached.
Through-hole DO-201 package and board integration
The DO-201AA (DO-27) axial-lead package is a through-hole form factor — the leads insert into plated through-holes on the PCB and are wave-soldered. The 0.042-inch (1.07mm) lead diameter handles the 38A pulse current without fusing, but the PCB trace width feeding the cathode and anode pads must be sized for the peak current; a 2oz copper trace at least 2mm wide per leg keeps the IR drop below 0.1V during the pulse. The axial body sits above the board — no thermal pad underneath, so the junction-to-ambient thermal resistance is dominated by the lead length and the copper pad area on the board.