The MMCX (Micro-Miniature Coaxial) connector series is a micro-miniature version of the MCX. It has the all features of the MCX series, including 50 impedance with a broadband capability of DC to 6 GHz and secure, fast and easy snap-on/ snap-off coupling, and a wide range of available connectors. However, MMCX connectors have a smaller foot print than the MCX series.

Like the MCX, the MMCX series conforms to the European CECC 22000 specification.