Clamp voltage and pulse current — the protection decision
The 1.5KE7.5AHE3_B/C: The 11.3V clamp at 139A means a 12V nominal rail sees the TVS hold the surge below the downstream IC's abs-max rating — the 6.4V standoff ensures the diode stays off the line during normal operation, drawing no leakage that would disturb a sensitive bias. Unidirectional (single-channel) construction clamps only one polarity — the forward drop handles the reverse surge. The 7.13V minimum breakdown voltage guarantees the avalanche threshold is reached before the protected circuit's own breakdown.
Package and board-fit for through-hole designs
DO-201AA (DO-27) axial package — the 1.5KE body diameter and lead spacing match standard through-hole layouts for telecom line cards and automotive ECU protection stages. Tape-and-reel packaging supports automated insertion; the axial leads are tinned for solderability in wave or selective soldering profiles.