SMA RF Connectors | 50 Ohm Coaxial Connectors up to 34 GHz
SMA connectors are threaded RF coaxial connectors designed for reliable high-frequency signal transmission up to 34 GHz. They are widely used in industrial, automotive and wireless systems applications.
Overview
SMA coaxial connectors are a compact, high-performance interface designed to deliver reliable signal integrity in demanding applications up to 18 GHz with extended capabilities to 34 GHz. Amphenol RF offers a broad portfolio of precision SMA RF connectors engineered for durability, repeatable mating, and consistent electrical performance across industries including Aerospace, Mobile Networks, Instrumentation and Military and Defense.
Crafted in stainless steel or brass per MIL‑C‑39012 standards, SMA interfaces provide repeatable contact, excellent phase stability and compatibility with industry-standard cables, semi‑rigid and LM(R) series. Available in a variety of plug, jack, and adapter configurations, these 50 Ω connectors provide secure threaded coupling and dependable connectivity for critical RF systems. Designed to handle up to 34 GHz in extended‑range versions, SMA connectors are trusted in portable radios, radar systems, aerospace and precision test solutions where signal integrity is paramount and mechanical ruggedness is essential.
Features and Benefits
- Precision ¼‑36 threaded coupling for robust vibration resistance
- Frequency range DC–18 GHz (up to 34 GHz extended‑range)
- High durability: up to 500 mating cycles
- Materials: stainless steel or brass, gold/nickel/passivated finishes
- Compatible with flexible, low‑loss and semi‑rigid/coaxial cables
- Precision-grade options ideal for phase‑sensitive microwave applications
Key Technical Details
- Impedance: 50 Ω
- Frequency Range: DC–18 GHz (connector/cable dependent; extended range to 34 GHz)
- Voltage Rating: 335 Vrms continuous; 1000 Vrms dielectric withstand
- Dielectric Material: PTFE
- Coupling Torque: 3–5 in·lbf (brass), 7–10 in·lbf (stainless steel)
Applications
- RF and microwave test and measurement systems
- Antenna feedlines and base station radios
- Aerospace and defense instrumentation
- Precision phase‑matching in radar and navigation systems
- OEM and lab RF interconnects requiring durability and accuracy
Browse our range of standard SMA Connectors or contact our engineers for custom rotary, phase-matched, or ultra-low-loss solutions.
Related Products
Amphenol RF offers a full range of compatible SMA Adapters and SMA Cable Assemblies
Specifications
SMA Connectors
Electrical
| Impedance | 50 Ohm |
| Frequency Range | DC - 18 GHz (Up to 34 GHz on Extended Range Designs) |
| Voltage Rating | 335 Volts RMS Continuous |
| Dielectric Withstanding Voltage | 1000 VRMS Min |
| VSWR (Return Loss) | |
M39012 Straight Connectors |
|
.141" OD Copper Jacket Cable |
1.05 + .005 f (GHz) |
RG-58/RG-142 Group |
1.15 + .011 f (GHz) DC-12.4 GHz |
RG-174/RG-316 Group |
1.15 + .02 f (GHz) DC-12.4 GHz |
RG-178 Group |
1.20 + .025 f (GHz) DC-12.4 GHz |
M39012 Angle Connectors |
|
.141" OD Copper Jacket Cable |
1.10 + .01 f (GHz) |
RG-58/RG-142 Group |
1.15 + .02 f (GHz) DC-12.4 GHz |
RG-174/RG-316 Group |
1.15 + .03 f (GHz) DC-12.4 GHz |
RG-178 Group |
1.20 + .03 f (GHz) DC-12.4 GHz |
| Insulation Resistance | 5000 MΩ Min |
| Center Contact Resistance | 3.0 mΩ Max |
| Outer Contact Resistance | 2.0 mΩ Max |
| RF Leakage | -60 dB Max (DC - 3 GHz) |
| Insertion Loss | .06 √(f(GHz)) dB Max |
| Power Handling | 75 W @ 10 GHz @ 25ºC |
Environmental
| Temperature Range | |
Typical |
-65°C to +165°C |
Styrene Insulator or Phosphor Bronze Contact |
-40°C to +85°C |
| Thermal Shock | MIL-STD-202, Method 107 (Test Condition B) except high temp test @ +200°C |
| Corrosion | MIL-STD-202, Method 101 (Test Condition B) - 5% Salt Solution |
| Vibration | MIL-STD-202, Method 204 (Test Condition D) |
| Mechanical Shock | MIL-STD-202, Method 213 (Test Condition I) - No Discontinuity Permitted |
| Moisture Resistance | MIL-STD-202, Method 106 |
| Altitude | MIL-STD-202, Method 105 (Test Condition C) |
Mechanical
| Mating Cycles | 500 Min |
| Coupling Mechanism | Threaded |
| Interface Specification | MIL-STD-348 |
| Mating Torque (Stainless Steel Plug) | 0.8 - 1.1 N-m (7 - 10 in-lbs) |
| Mating Torque (Brass Plug) | 0.3 - 0.6 N-m (3 - 5 in-lbs) |
Note: These characteristics are typical and may not apply to all connectors.
Connector configurations may affect performance.
Interface Dimensions
Plug
Jack
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Amphenol RF Connectors for Low Loss Cables | Tech Specs
View full article: https://www.allaboutcircuits.com/new-industry-products/amphenol-rf-connectors-for-low-loss-cables-tech-specs/
Amphenol RF offers SMA, TNC, and N-Type connectors that have been redesigned and optimized for use with low loss cabling. They offer improved grounding, enhanced shielding, and low return loss from DC to 6GHz. The connectors are available in straight jack, bulkhead jack, straight plug, and right-angle plug configurations, with options for 195, 240, and 400 series low loss cable. For more information, as well as all the latest All About Circuits projects and articles, visit the official website at http://www.allaboutcircuits.com/
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Component360: Amphenol RF SMA Connectors
RF devices are an integral part of everyday life and are instrumental to the operation of base stations antennas, telecom wireless data networks, test labs, radar and microwave systems.
Amphenol RF produces a full range of SMA connectors for these and other applications which
are available with a variety of body materials including brass, stainless steel and beryllium copper. Body finishes are available as passivated gold, nickel and white bronze. Amphenol's durable
design offers a minimum of 500 mating cycles and are rated for frequencies from DC up to 26.5 gigahertz. PCB versions are also available for surface mount, through-hole and in launch. To
learn more or purchase Amphenol RF SMA connectors click the link in the description below.
Amphenol RF high frequency SMA end launch connectors offer excellent VSWR performance up to 26.5 GHz. These connectors feature an optimized end launch design with either through-hole legs or traditional slide-on mounting legs that make them an ideal PCB connector solution for high frequency applications.
Learn More: https://goo.gl/gBqjEY
SMA to 2.92 mm RF Adapters | High-Frequency Precision Adapters up to 40 GHz
Discover the latest SMA to 2.92 mm RF adapters from Amphenol RF, engineered to deliver reliable high-frequency performance for demanding RF and microwave applications.
In this video, we introduce our new precision adapter solutions and review their key specifications, including frequency performance, durable threaded interfaces, and design features that support signal integrity in high-frequency systems.
These SMA to 2.92 mm adapters provide flexible connectivity between popular RF interfaces and are ideal for applications requiring consistent performance and repeatable mating.
Key Features
• Precision SMA to 2.92 mm interface design
• Reliable performance for high-frequency applications
• Secure threaded coupling mechanism
• Durable construction for repeated mating cycles
Typical Applications
• Test and measurement equipment
• RF and microwave systems
• Aerospace and defense electronics
• Communications infrastructure
Learn how these adapters can help engineers simplify RF system integration while maintaining signal performance.
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