SMC connectors provide a good combination of small size and performance and are available in 50 ohm or 75 ohm impedances. It offers excellent electrical performance from DC to 11 GHz. This version is similar to the SMB connector, but it uses a threaded coupling interface rather than the snap-on connection. The threaded coupling mechanism permits a vibration-proof connection which is ideal for semi-permanent connections and for the use in mobile equipments with low VSWR requirements.