Clamp voltage and surge current that define the protection window
The 1.5SMC18CA-M3/9AT: With a peak pulse current of 59.5A into the 25.2V clamp, this part handles substantial energy from lightning-induced surges or inductive load dumps. The bidirectional single-channel configuration means it protects symmetrical signal pairs or AC lines without needing two diodes back-to-back. Operating temperature spans -65°C to 150°C junction, so it suits outdoor telecom enclosures or under-hood automotive modules where ambient heat is a factor.