What the 1500W peak pulse rating means for the BOM
The 1.5KE15CAHE3/51: The 12.8 V reverse standoff voltage means the diode stays off below that DC rail — it only conducts when a transient pushes above the 14.3 V minimum breakdown threshold. For a 12 V automotive bus, that leaves about 1.5 V of headroom before the TVS starts to avalanche.
Automotive-grade qualification and temperature envelope
The TransZorb series uses a passivated glass junction for high-temperature stability — leakage current stays controlled at the upper end of the range.
Package and mounting — DO-201AA axial through-hole
The leads are tin-plated copper, compatible with wave solder or hand-soldering. No moisture sensitivity level applies; no bake-out required before assembly.
Lifecycle reality — obsolete, no direct successor
Vishay has marked the 1.5KE15CAHE3/51 as obsolete. A pin-compatible functional replacement would require a board-level review of the standoff voltage, clamping voltage, and AEC-Q101 qualification requirements.