I have lifted this straight from another forum so can't vouch for it's accuracy. Author plasma_d00d:
http://www.amphenolrf.com/images/mmcx.gif
The MMCX series is also called MicroMateTM. It is Amphenol's smallest RF connector line and was developed in the 1990's. MMCX is a micro-miniature connector series with a lock-snap mechanism allowing for 360 degrees rotation enabling flexibility in PCB layouts. MMCX connectors conform to the European CECC 22000 specification.
The micromate family of products is a 6 GHz 50 Ω interconnect system. A range of connectors are available including surface mount, edge card, and cable connectors.
Features & Benefits
Broadband performance with low reflection DC to 6 GHz, providing a high-quality solution at a low cost
Quick connect/disconnect snap-on mating reduces installation time
Conforms to European CECC 22000 specifications
Available in straight and right angle plugs and printed circuit board connectors
Applications
Antennas Base stations Broadband communications
Cable assemblies Components GPS
Instrumentation PCMCIA cards Radio boards
Satcom Telecom
MMCX Specifications
Electrical CECC 22000 Test Requirement
Impedance 50 Ω
Frequency Range DC - 6 GHz
VSWR 4.4.1
SMT & Edgecard Cabled
DC - 4 GHz: 1.15 max Straight semi-rigid: 1.15 max
4 - 6 GHz: 1.40 max Straight flex: 1.20 max
R/A semi-rigid: 1.20 max
R/A flex: 1.25 max
Dielectric withstanding voltage @ sea level 4.4.5 500 V rms, 50 Hz
Dielectric working voltage @ sea level 4.4.4 = 170 V rms, 50 Hz
Insulation Resistance 4.4.4 = 500 MΩ
Center Contact Resistance 4.4.2 = 10 mΩ
Outer Contact Resistance 4.4.3 = 5 mΩ
Mechanical CECC 22000 Test Requirement
Engagement force 4.5.4 = 3.4 lbs
Disengagement Force 4.5.4 1.4 lbs to 3.4 lbs
Contact Captivation 4.5.2 2.3 lbs
Durability 4.7.1 = 500 cycles
Materials
Leads Beryllium copper with gold plating per QQ-C-530
Contact Socket Beryllium copper with gold plating per QQ-C-530
Outer Conductor Beryllium copper with gold plating per QQ-C-530
Housing (SMT) Liquid crystal polymer
Insulator PTFE per ASTM-D1457
Environmental CECC 22000 Test Requirement
Temperature Range -40� C - + 90� C
Temperature Shock 4.6.7 MIL-STD-202, method B
Humidity 4.6.6 MIL-STD-202, method 103, test condition B
Vibration 4.6.3 3 cycles, 3 opposite directions, 10-150 Hz, 10-60 Hz: 0.75 mm/.030 in., 60-150 Hz 10 G's
Mechanical Shock 4.6.4 MIL-STD-202, method 213, test condition B
Note: These characteristics are typical but may not apply to all connectors.
