SMC (Sub Miniature version C) Connectors are coaxial RF Connector. SMC RF Connectors are semi-precision, sub miniature devices that Provide repeatable electrical performance from DC to 10 GHz. They offer excellent electrical performance from DC to 10 GHz. Female SMC connectors have a socket for the canter contact, and are therefore analogous to the “reverse polarity” versions of other types of RF connectors.