Automotive-grade 1500 W surge clamp
The 1.5KE91AHE3_A/D: This means it is screened for the temperature extremes and surge profiles found in vehicle electrical systems, not just general-purpose industrial use. The 1500 W rating at 10/1000 µs is the standard TVS benchmark — it defines the surge the diode can absorb once without failing short.
AEC-Q101 and the under-hood temperature envelope
The operating junction temperature range spans -55°C to 175°C, covering the full under-hood ambient plus self-heating margin. AEC-Q101 Grade 0 qualification (the highest automotive grade) is implied by the 175°C limit — parts rated to 150°C are typically Grade 1. This matters for engine-bay or transmission-mounted modules where ambient can exceed 125°C.
Through-hole DO-201AA package and board integration
The leads are tin-plated copper; the body is molded epoxy with a flammability rating per UL 94 V-0. Power line protection is not supported (the part is unidirectional, not bidirectional), so it is intended for DC rail clamping where the polarity is fixed. For AC or bidirectional lines, a pair of unidirectional diodes back-to-back or a dedicated bidirectional TVS is required.