SMA Cable Assemblies

SMA cable assemblies are widely used in telecommunications infrastructure, radar systems, aerospace electronics, test and measurement equipment, GPS devices, and satellite communications. Their high-frequency capability, mechanical reliability, and compact size make them suitable for environments where performance and space constraints are equally important. Engineers often choose SMA connectors for both prototyping and production systems that require consistent signal quality and mechanical stability.

To select the proper SMA cable assembly, consider the frequency range, connector type (standard, reverse-polarity, or precision SMA), and cable type (e.g., RG-316, RG-402, or low-loss semi-rigid options). Ensure the assembly matches your system’s impedance—typically 50 Ω—and verify power handling, flexibility, and bend radius requirements. Environmental conditions like temperature, vibration, and moisture should also guide the selection of connector plating and cable jacket materials.

SMA connectors offer superior impedance matching and performance up to microwave frequencies, with excellent repeatability and low VSWR. Their threaded coupling provides strong mechanical engagement, minimizing disconnection under vibration. Compared to BNC or TNC connectors, SMA connectors support higher frequencies and smaller dimensions, making them well-suited for compact, high-performance systems. Precision SMA variants further reduce signal loss and reflection in sensitive measurement and aerospace applications.

Keep SMA connectors clean and free of dust or oil. Use lint-free swabs and alcohol-based cleaners to wipe contacts and mating surfaces. Always hand-tighten connectors using the recommended torque (typically 5–8 in-lbs) with a torque wrench to avoid damaging threads. Avoid overbending cables and use proper strain relief to prevent signal degradation. Routinely inspect the assembly for wear, center pin damage, or dielectric cracking, especially in high-frequency or high-vibration environments.