Peak pulse power and clamping for 77.8V rails
The 1.5KE91A-TP: The 86.5V minimum breakdown voltage ensures the device does not conduct during normal line transients below that threshold, so it sits transparently on a nominal 77.8V DC bus until a surge event triggers avalanche conduction.
DO-201AE axial package and mounting
Housed in a DO-201AE axial-lead package, the 1.5KE91A-TP mounts through-hole on a PCB or terminal strip. The 1500W rating assumes a 25°C ambient and proper lead-length soldering to a copper trace that sinks the transient heat; derate above 25°C per the datasheet curve. Tape & Reel packaging (TR) suits automated insertion; Cut Tape (CT) is available for prototype or low-volume builds.
Active lifecycle and sourcing posture
No official second-source or pin-compatible cross-reference is published, but the 1.5KE91 family (base number 1.5KE91) shares the same DO-201AE footprint and electrical ratings across the A-suffix variants.
Temperature range and general-purpose deployment
The device is not intended for power-line protection (no internal filter or coordination with mains fuses); it is a general-purpose transient suppressor for DC rails, signal lines, and low-voltage AC secondary circuits.