SMC (SubMiniature version C) coaxial RF connectors were invented in the 1960s. MIL-STD-348 contains interface standards for the SMC and several additional connectors. They employ a threaded interface that is #10-32 UNF (screw type). Electrical performance ranges from DC to 10 GHz using SMC connectors. The center contact on Male (Plug) SMC connectors is a socket, whereas the center contact on Female (Jack) SMC connectors is a pin. External threads are used on SMC jack connectors, whereas matching hex nuts are used on SMC plug connectors. They offer an interface for tiny form factor coaxial cables (e.g. 50-Ohm RG-174, 75-Ohm RG-179) and printed circuit boards when a compact footprint is necessary.
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