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SMA (SubMiniature version A) connectors are semi-precision coaxial connectors widely used in RF and microwave applications up to 18 GHz. Developed in the 1960s, these threaded connectors feature a compact design with 50Ω impedance, making them ideal for wireless systems, test equipment, and aerospace applications. The SMA's robust construction combines reliability with relatively easy field installation, though proper torque application is critical for optimal performance. With both standard and reverse-polarity configurations available, SMA connectors serve as a versatile solution for frequencies where larger connectors become impractical.

Base Products

SMA R/A BHD Jack Solder

SMA R/A BHD Jack Solder

SMA-BHD, Right Angle,Solder,50 Ohm, DC-3GHz, brass/gold, RoHS compliant,Bulkhead - Front Mount
SMA JB3 RF Connector

SMA JB3 RF Connector

High-precision SMA JB3 Connector with DC–8.5 GHz support. Gold-plated for durability and ultra-stable signal.
SMA R/A Solder RG-405 50Ω Plug

SMA R/A Solder RG-405 50Ω Plug

SMA,Right Angle,Solder,50 Ohm,RG-405,Cable Mount, DC-3GHz, brass/gold, RoHS compliant,Plug
SMA Stright Solder RG58 Plug

SMA Stright Solder RG58 Plug

SMA,Stright,Solder,50 Ohm, Cable Mount, For RG-58,DC-18GHz, brass/gold, RoHS compliant, Plug
SMA Stright Solder RG58 Plug

SMA Stright Solder RG58 Plug

SMA,Stright,Solder,50 Ohm,Cable Mount,For RG-58,DC-18GHz, brass/gold, RoHS compliant,Plug
SMA-JB3 Stright Solder SM141 Plug

SMA-JB3 Stright Solder SM141 Plug

SMA-JB3,Stright,Solder,50 Ohm,Cable Mount,For SM141,DC-18GHz, brass/gold, RoHS compliant,Plug
SMA-JB3 Stright Solder SM141 Plug

SMA-JB3 Stright Solder SM141 Plug
SMA-JWB3 R/A Solder RG402 Plug

SMA-JWB3 R/A Solder RG402 Plug

SMA-JB3,Right angle,Crimp,50 Ohm,Cable Mount,For RG-316,DC-18GHz, brass/gold, RoHS compliant,Plug
SMA-JB3 Stright Solder SM141 Plug

SMA-JB3 Stright Solder SM141 Plug
SMA-JWB2 R/A Crimp .086 Plug

SMA-JWB2 R/A Crimp .086 Plug
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Category Insights

SMA connectors are commonly rated for operation up to 18 GHz, though performance begins degrading above 12 GHz where precision connectors like 2.92mm may be preferable. The actual usable frequency range depends on the connector quality, with inexpensive versions sometimes limited to 6 GHz. Military-grade SMA connectors maintain better electrical characteristics at higher frequencies due to tighter manufacturing tolerances and superior materials.
Standard SMA connectors are not waterproof, but weather-resistant versions with silicone seals and corrosion-resistant plating are available for outdoor use. These environmental SMA connectors typically carry IP67 ratings when properly mated. For permanent outdoor installations, consider using drip loops and protective boots to enhance weatherproofing, as repeated mating/unmating can compromise the seals over time.
Reverse polarity SMA (RP-SMA) swaps the gender of the center conductor while maintaining the same outer thread configuration. Originally developed as a proprietary WiFi antenna connector to prevent unauthorized antenna swaps, RP-SMA now appears in various consumer wireless devices. It's crucial to verify polarity requirements as forced mating between standard and RP-SMA can permanently damage both connectors.
Quality SMA connectors generally support 500-1000 mating cycles when properly handled. The actual lifespan depends on factors like plating quality (gold vs. nickel), torque application, and environmental conditions. Over-tightening is a common failure cause, as it can deform the center pin or dielectric. Using a torque wrench (typically 5-8 in-lbs) significantly extends connector life.
SMA remains widely used due to its excellent balance of size, performance, and cost. While newer connectors offer better high-frequency performance or easier mating, SMA provides sufficient characteristics for many applications at a competitive price point. The extensive installed base and tooling availability also contribute to its ongoing popularity, particularly in aerospace, defense, and legacy systems where connector changes would require expensive requalification.