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. The electrical performance benefits of the QMA include low loss RF performance up to 6 GHz. Because of the innovative coupling mechanism, a 360-degree butt joint is maintained which results 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.

Selection Matrix
Cable Group


Impedance50 Ohm
Frequency Range DC - 18 GHz
Voltage Rating 335 Volts RMS Continuous
Dielectric Withstanding Voltage 1000 VRMS Max
VSWR (Return Loss)
DC - 3 GHz 1.052 (-32 dB) Max
3 - 6 GHz 1.12 (-32 dB) Max
Insulation Resistance 5000 MΩ Min
Center Contact Resistance 2.5 mΩ Max
Outer Contact Resistance 3.0 mΩ Max
RF Leakage -120 dB Max (DC - 3 GHz)
Insertion Loss .06 √(f(GHz)) dB Max
Power Handling 75 W @ 10 GHz @ 25ºC


Mating Cycles 100 Min
Coupling Mechanism Push-Pull
Interface Specification Quick Lock Formula - QMA
Engagement Force 25 N Typ
Disengagement Force 20 N Typ
Temperature Range −40°C to +85°C
Thermal Shock IEC 60169-1 16.4 (-40⁰C to +85⁰C)
CorrosionIEC 60169-1 16.7 (48 Hrs)
VibrationIEC 68-2-64 Random
Moisture Resistance IEC 60169-1 16.3 (96 hrs) Steady State