The 1.5KE33CAE3/TR13: It clamps transients at 45.7 V max while carrying a 33 A peak pulse current, making it a fit for protecting 24 VDC rails in industrial control, motor drives, and battery-charger circuits against surge events like inductive kickback or lightning-coupled spikes.
The 28.2 V reverse standoff voltage is the maximum DC or AC peak voltage the diode can hold off without conducting — a 24 V nominal rail with 10 % tolerance sits at 26.4 V, so this part provides margin before the TVS starts to leak. Breakdown occurs at 31.4 V min, and clamping is guaranteed at 45.7 V max at the full 33 A pulse current, meaning downstream components see no more than that voltage during a surge. The 1500 W peak pulse rating is tested with a 10/1000 µs waveform — a standard telecom surge shape. For shorter pulses (like 8/20 µs from ESD or lightning), the part can absorb significantly more peak power, but the 1500 W figure is the baseline for comparing against other TVS diodes in the same class. Operating temperature spans -65°C to 150°C junction, which covers outdoor enclosures, engine compartments, and cold-chain equipment without derating concerns at the extremes.
Microsemi has marked the 1.5KE33CAE3/TR13 as Obsolete.