The P2703AC is a SIDACtor protection thyristor from Littelfuse, designed for baseband overvoltage protection. It features an off-state voltage range of 230V to 300V, a holding current of 150mA, and a switching current of 800mA.
P5103ACMCL is a thyristor surge protector from Littelfuse Inc. It features an 8V breakover voltage and 100A peak surge current capability in a through-hole TO-220 Modified package.