The 1.5KE39AHE3/51: The 33.3V reverse standoff is the maximum DC voltage the diode will not conduct at in normal operation — a 24V battery rail at full charge (28.8V) sits below this, so the TVS stays off until a transient arrives. That clamp voltage is the highest voltage the protected circuitry sees during the surge — downstream components must survive at least that peak. The 1500W rating is the product of clamp voltage and peak current at the 10/1000µs test waveform — a standard automotive transient pulse. A shorter pulse (8/20µs) allows higher peak current; a longer one derates the power.
Obsolete — sourcing through independent channels
Availability and pricing are confirmed at RFQ against the BOM quantity; each lot is verified for authenticity and RoHS compliance. The DO-201AA (DO-27) axial-lead package is through-hole mount, compatible with existing PCB layouts for this footprint.