M8/M12 Surface-Mount Circular Connectors Phoenix Contact M8/M12 Surface-Mount Circular Connectors are two-piece connectors designed for PCBs that can be equipped on both sides and do not have via holes for the connection pins. These IP67-rated connectors feature currents up to 4A and voltages up to 250V, and have similar mechanical strength compared to through-hole mounting. Phoenix Contact M8/M12 SMT Circular Connectors are available as A, B, or D coded, with plug or receptacle shell styles.