Automotive-grade 1500W surge clamp for 12V/24V vehicle buses
The 1.5KE47HE3/54: With a 38.1V reverse standoff voltage, it protects 12V and 24V vehicle electrical systems from load-dump and inductive-switching transients by clamping at 67.8V maximum.
Clamping window and thermal envelope
Breakdown voltage starts at 42.3V minimum, ensuring the device does not conduct during normal bus operation at 38.1V standoff. The 67.8V clamp ceiling keeps the protected node below the 100V absolute maximum of most automotive-rated ECUs and sensors.
Obsolete — sourced through surplus channels
Vishay lists this part as Obsolete. The through-hole DO-201AA axial package is a legacy footprint. Board-level replacement is straightforward if the original BOM position accepts this form factor. Confirm the mating hole pattern and lead spacing before committing.