The MMCX coaxial connector is a push-in connector that is 50 ohms and can be mounted to semi-rigid and flexible coaxial cables. The MMCX interface measures 7 mm from the top of the connector to the mating surface and the center stylus is typically 4 mm OD. The MMCX is designed for smaller cables. 0.047, 0.085 (2.1 mm) semi-rigid and RG-316, RG-174. The cutoff frequency of the MMCX is typically about 6 GHz.

    The MMCX interface is smaller in size than the MCX connector and has an advantage in cost. The disadvantage is that there are not many cable types to choose from, and because it is a push-in connection, it is easy to be ejected.