The 1.5KE27CA B0G: Its 23.1 V reverse standoff voltage means it stays transparent on a nominal 24 V rail, only conducting when the line exceeds 25.7 V typical breakdown, and clamping hard at 37.5 V maximum — the protection window is tight enough to shield downstream 30 V-rated DC-DC converters.
Bidirectional layout and temperature range
The operating junction temperature range spans -55°C to 175°C, so it survives the thermal cycling of outdoor telecom cabinets or under-hood automotive electronics without derating the peak pulse power at the hot corner. Housed in the DO-201AA axial package (DO-27 equivalent), it mounts through-hole — the leaded body handles the mechanical stress of repeated surge events better than a surface-mount part in the same power class.