The QMA connector is a quick disconnect version of the SMA connector and shares the same internal construction, which allows the connector to have excellent performance up to 6 GHz. Because of the innovative coupling mechanism, a 360-degree butt joint is maintained resulting in low RF leakage. Since the RF line is identical to the SMA series, the QMA connectors also offer the same high power handling capability. This gives the series significant advantages over other quick disconnect connectors.

Mechanically, the QMA series offers a more convenient installation than SMA connectors. Because the interface mates with a snap-on instead of a threaded coupling, there is a significant time advantage. Typically, these connectors can be installed into a system 10 times faster than an SMA connector. Another benefit of eliminating the threaded coupling is the denser packaging. The pitch between connector can be reduced because there is no requirement for wrench clearance. Connectors can be rotated 360 degrees after they are mated which greatly improves the flexibility of installations.

Related Products

QMA Adapters

Features and Benefits

  • Snap-on interface for quick and easy installation
  • 50 Ohm nominal impedance
  • Rotatable 360° after connection for flexibility with installation


  • Antennas
  • Base stations
  • GPS

QMA Specifications

Impedance 50 Ohms
Frequency Range DC-18 GHz
Screening Effectiveness  
DC-3 GHz -80 dB min
3-6 GHz -70 dB min
Contact Resistance  
Center Contact 2.5 mΩ max (initial)
Outer Contact 3.0 mΩ max (initial)
Passive Intermodulation -120 dBc @ 1.8 GHz 2x 20W static*
Insulation Resistance 5x103 MΩ min (initial)
Power Handling 150 W @ 2.5 GHz typical
Dielectric Withstanding Voltage (Sea Level) 1000 VRMS 50 Hz
Working Voltage (Sea Level) ≤ 480 VRMS 50 Hz
Temperature Range -40⁰C to +85⁰C
Thermal Shock IEC 60169-1 16.4 (-40⁰C/ +85⁰C)
Corrosion IEC 60169-1 16.7 (48 hrs)
Damp Heat IEC 60169-1 16.3 (96 hrs) steady state
Vibration IEC 68-2-64 random 
5-20 Hz 1.29 (m/s2)2 /Hz
20-500 Hz -3dB/octave
Interface Retention Force 60 N min
Durability (Matings) 100 mating cycles min
Connector Pitch 12.4 mm min center to center
Engagement Force 25 N typical
Disengagement Force 20 N typical
*Only for PIM-specific designs 
These characteristics are typical and may not apply to all connectors.

Interface Dimensions