The 1.85mm was designed to go beyond the SMA interface constraints, and as a result is NOT SMA compatible. Instead, maximum performance to the highest possible frequency that the geometry would allow, along with repeatable measurements after hundreds or even thousands of interconnects, were the design goals.

MMCX series is intended for use in applications where the smallest dimensions have to be achieved. MMCX connectors can be used in applications from DC to 6 GHz and aim to meet the expanding needs of surface mount coaxial interconnection system as well as the conventional connector styles for flexible and semi-rigid cables.