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Electronic Component BNC SMA SMB TNC MCX MMCX Coaxial  RF Connector 1.Material : Brass ,gold plating over nickel 2.Electrical/Physical   Current rating: 1.5A   Contact resistance:30mΩ(Max)   Insulation resistance:500mΩ MIN @500DC   Voltage rating:125V AC RMS    Durability:750 cycles MIN   Operating temperature:-30ºC~ +85ºC

The SMA connector is typically rated for mode-free operation from DC to 18 GHz, though some proprietary versions are rated to 26.5 GHz. For performance above this, other SMA-like connectors are used. These include the 3.5 mm connector, rated to 34 GHz, and the 2.92 mm (also known as 2.9 mm, K type, or SMK), good up to 46 GHz. These connectors keep the same outside thread as the SMA, so they can potentially be cross-mated, but the precision connector can be easily damaged when mating with low-grade SMA connectors.The precision versions use an air dielectric with appropriately scaled center conductors.