Why the 77.8V standoff matters for your rail
The 1.5KE91CAE3/TR13: At 125V clamping, the TVS holds the surge voltage below what a 100V-rated MOSFET or capacitor would see, protecting the load from the transient energy. The 1500W peak pulse rating is tested with a 10/1000 µs waveform — a standard telecom surge shape. For shorter pulses (8/20 µs), the peak power capability is higher; for longer transients, derate accordingly.
Sourcing an EOL part for a production BOM
This part is available through independent surplus and broker channels, sourced to order against an RFQ. Availability and date-code provenance are confirmed at quote time — every lot is traceable back to the manufacturer's original production. For a new design, a current-production TVS from the same 1.5KE family (e.g., the 1.5KE91CA series in a non-EOL suffix) should be evaluated, but the bidirectional, 77.8V standoff, and 1500W rating must be matched exactly to maintain the same protection profile.