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MMCX (micro-miniature coaxial) connectors are coaxial RF connectors similar to MCX but smaller. They conform to the European CECC 22 000 specification. The connectors have a lock-snap mechanism allowing 360-degree rotation and usually have a 50 Ω impedance. They offer broadband capability from DC to 6 GHz.[1]

MMCX connectors are most commonly seen on Wi-Fi PCMCIA cards as antenna connectors or as connectors for external GPS antennas on small devices like PDAs or GPS receivers. They were developed in the 1990s.


Electrical DataDetail
Impedance50 ohms
Frequency range0 to 6GHz
Working Voltage170 Vrms max.
Dielectric withstanding voltage500 Volts rms min.
  • Straight connector :1.30 max.
  • R/A connector: 1.5 max.


Mechanical DataDetail
Engagement force3.4 lbs max.
Disengagement force1.4 lbs~3.4 lbs
MatingLock-Snap coupling
Connector durablity500 matings
Cable retention force
  • RG178=7.3 lbs min.
  • RG174=9.7 lbs min.
  • RG316=12.1 lbs min.