1.5KE33AHE3/51 — obsolete AEC-Q101 TVS diode, 1500 W peak pulse
Its 28.2 V reverse standoff voltage and 45.7 V clamping at 32.8 A peak pulse current define the protection threshold for 24 V nominal rails in engine-bay or chassis-domain electronics. The DO-201AA (DO-27) axial leaded package requires through-hole mounting — a board spin if the existing layout uses surface-mount TVS diodes.
Obsolete — sourcing through independent channels
Vishay lists the 1.5KE33AHE3/51 as obsolete. No official successor order code is recorded in the lifecycle data. The AEC-Q101 qualification and full lot traceability are maintained on available stock.
Clamping voltage and standoff — fit for 24 V automotive rails
With a reverse standoff of 28.2 V, the diode does not conduct at the nominal 24 V bus voltage. The breakdown minimum of 31.4 V provides margin above the standoff before avalanche starts. The 1500 W peak pulse rating is a 10/1000 µs figure; real-world transients (e.g., ISO 7637-2 pulses) have different energy content, so the derating curve in the datasheet governs the actual capability for shorter or longer events.