SMA RF Coaxial Connectors
SMA connectors are threaded RF coaxial connectors designed for reliable, high-frequency signal transmission up to 34 GHz, with a 50-ohm impedance. They are widely used in industrial, automotive and wireless applications.
Overview
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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 LMR 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
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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
Frequently Asked Questions About SMA Connectors
What is an SMA connector?
SMA connectors are 50 ohm coaxial RF connectors with a threaded interface, commonly used in microwave systems, antennas, and test equipment.
What is the frequency range of SMA connectors?
Standard SMA connectors operate from DC to 18 GHz, with precision versions supporting up to 34 GHz.
How do I select an SMA connector for a cable?
Select an SMA connector based on the cable type, connector gender, frequency range, mounting configuration, and environmental requirements of your application. Amphenol RF offers SMA connectors for flexible, semi-rigid, and conformable coaxial cables, including common cable types such as RG-58, RG-142, RG-174, RG-178, and RG-316. For pre-configured solutions, explore our SMA Cable Assemblies.
What torque should be used for an SMA connector?
The recommended mating torque depends on the SMA connector material. Amphenol RF specifies 3–5 in-lbf (0.3–0.6 N·m) for brass plugs and 7–10 in-lbf (0.8–1.1 N·m) for stainless steel plugs. Always check the individual product drawing or datasheet for the specific connector before installation.
What is the difference between SMA and RP-SMA?
RP-SMA connectors reverse the gender of the center pin while maintaining the same threaded interface. Amphenol RF offers RP-SMA Connectors and RP-SMA Adapters for applications requiring this interface.
How many mating cycles are typical for SMA connectors?
SMA connectors are typically rated for 500 mating cycles minimum, although the actual durability can vary depending on the connector design, materials, and application. Amphenol RF also offers specialized SMA designs and cable assemblies for applications requiring repeated mating and long-term mechanical durability.
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IP67 SMA Cable Assemblies Datasheet
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Locking SMA Cable Assemblies Datasheet
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SMA Cable Assemblies on RG-188 Datasheet
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4.3-10 Adapters
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AMMC Connector Series
Amphenol Micro Miniature Coaxial (AMMC) connectors are designed for portable and mobile devices, featuring a low profile with a 1.4 mm mated height and a 2 mm x 2 mm footprint. These connectors support high-frequency transmission from DC to 6 GHz, offer easy snap-on/off mating, and are compatible with Hirose W.FL and IPEX MHF III series, making them ideal for applications such as antennas, Bluetooth, GPS, WLAN, and cellular devices.
HD-EFI Connector Series
The HD-EFI product series by Amphenol RF offers micro-miniature interfaces designed for high-performance applications with a frequency range from DC to 6 GHz. These 50 ohm products are ideal for board-to-board applications, featuring versatile PCB mounts and bullet lengths, and providing up to 1.4 mm axial and radial float. HD-EFI connectors are available in various configurations, including through-hole, surface mount, edge launch, and thread-in, and support blind mating with crash-proof designs.
ATC-PS Precision Test Cables
The ATC-PS cable assemblies cutsheet provides info for ATC-PS cable assemblies, outlining their technical specifications, features, and applications. It provides precise information on the design and performance characteristics of these cable assemblies, including impedance, frequency range, insertion loss, and durability. The document highlights the materials used, ensuring reliability and high performance in demanding environments. Additionally, it specifies the industries and applications these cable assemblies are designed for, demonstrating their suitability for various high-frequency and precision connectivity needs.
High Frequency SMA Connector Series
The Amphenol RF High-Frequency SMA Connectors Cut Sheet presents a premium line of high-performance SMA connectors engineered for exceptional signal integrity at high frequencies. Designed to support applications up to 27 GHz and beyond, these connectors deliver low VSWR, minimal insertion loss, and superior durability, making them ideal for 5G, aerospace, defense, and high-speed communication systems.
Connectors Optimized for Low Loss Cables
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SMA Cable Assemblies on LMR Cable
The Amphenol RF SMA cable assemblies cut sheet details pre-configured assemblies using LMR-195 and LMR-240 cables, ideal for high-performance applications such as base stations, antennas, and telecommunication devices. These assemblies, featuring SMA connectors and Times Microwave LMR cables, operate from DC to 6 GHz, offering lower loss and superior electrical performance with rugged construction. Configurations include straight plug, right-angle plug, and bulkhead jack, available in various lengths and custom options upon request.
SMA Panel Mount Receptacles
The Amphenol RF SMA Panel Mount Receptacles cut sheet details high-performance connectors supporting frequencies from DC to 18 GHz. These stainless steel receptacles are available in multiple panel mounting configurations, including 2 and 4-hole flanges, with various termination options such as post contacts, solder cups, and tab contacts. The connectors are suitable for applications like RF amplifiers, microwave filters, and power dividers, offering excellent VSWR performance and robust mechanical construction.
SMA Quick Connect Adapter Series
The Amphenol RF SMA Quick Connect Adapter Cut Sheet highlights a high-performance, rapid-mating SMA adapter designed for efficiency and reliability in RF testing and system integration. This adapter enables quick, secure connections without the need for threading, significantly reducing installation time and improving workflow efficiency. Engineered for low-loss signal transmission and durability, it is ideal for laboratory testing, production environments, and high-frequency applications.
SMA to AMC Cable Assemblies
The Amphenol RF SMA to AMC Cable Assemblies cut sheet outlines both IP-67 and non-IP-67 fixed length assemblies designed for various applications. These assemblies feature improved design SMA connectors, offering space-efficient and economical improvements, with support for thicker panels. They are ideal for WLAN, M2M communications, and outdoor equipment, and are available in different configurations with micro-coaxial cables in lengths from 50 mm to 300 mm.
SMA Connectors for TFC-302LL
Amphenol RF's SMA Connectors for Automotive Cable are compact, lightweight, and optimized for low loss cables, offering reliable performance up to 6 GHz. These connectors are ideal for applications requiring vibration resistance and low return loss, such as automotive testing, antennas, GPS, and V2V communication, and are available in bulkhead jack, straight, and right-angle plug configurations.
Anti-Torque SMA Connector Series
Amphenol RF's Anti-Torque SMA Connector Series offers high-frequency connectors designed for semi-rigid cables, supporting applications up to 26.5 GHz with SMA jacks and up to 34 GHz with 3.5 mm jack connectors. These connectors feature a rugged anti-torque body to prevent damage during installation and are ideal for test and measurement equipment, 5G wireless infrastructure, IoT, and industrial IoT applications. Constructed from brass or stainless steel with gold plating, they support a minimum of 500 mating cycles and ensure reliable performance with minimal reflections.
High Performance SMA Adapter Series
The Amphenol RF High Performance SMA Adapter series offers low-profile, cost-saving adapters with improved VSWR performance, operating up to 22 GHz. These adapters, featuring gold-plated brass bodies and beryllium copper contacts, are ideal for applications in SATCOM, radar, antennas, and wireless testing.
FAKRA to SMA Cable Assemblies
The Amphenol RF FAKRA to SMA Cable Assemblies Datasheet details pre-configured 50 ohm cable assemblies available in various lengths, designed for automotive and industrial applications such as ADAS, GPS, RFID, and wireless infrastructure. These assemblies feature flexible cables and high-quality connectors, providing reliable performance up to 3 GHz without the need for additional tooling.
SMA Panel Mount Bulkhead Jacks
Amphenol RF's SMA & RP-SMA Front Mount Bulkhead Jacks offer reliable electrical performance up to 6 GHz and feature a threaded coupling mechanism for secure mating. These 50 ohm connectors are ideal for applications with space constraints, such as antennas, base stations, drones, and test and measurement equipment, with options available for ultraminiature micro-coax cables and IP67-rated versions for added environmental protection.
SMA to AMC Ultraminiature Cable Assemblies
Amphenol RF's SMA to AMC Cable Assemblies feature reliable electrical performance up to 9 GHz, with threaded coupling for secure mating and vibration resistance. Available in IP67 and non-IP67 configurations, these 50 ohm assemblies are ideal for applications such as antennas, base stations, drones, and industrial automation, providing a compact and space-efficient solution with additional protection for harsh environments.
IP67 SMA & RP-SMA Panel Mount Bulkhead Jacks
Amphenol RF's IP67 SMA Front Mount Bulkhead Jacks offer waterproof, tamper-resistant RF interconnect solutions with reliable electrical performance up to 6 GHz. Designed for applications like antennas, base stations, and industrial automation, these connectors feature a threaded coupling mechanism for secure mating and are ideal for use in space-constrained environments.
SMA & RP-SMA Crimp Connectors
Amphenol RF's SMA and RP-SMA Straight Crimp Jacks provide reliable electrical performance up to 6 GHz, featuring a threaded coupling mechanism for secure mating and vibration resistance. These 50 ohm connectors are ideal for applications with space constraints, such as antennas, base stations, drones, and test and measurement equipment, and are available for various micro-coax cable types.
AUTOMATE Type A to Mini-FAKRA to SMA Cable Assemblies
Amphenol RF's AUTOMATE Mini-FAKRA breakout cables feature a quad-port Mini-FAKRA jack to four SMA plugs or jacks, designed on flexible TFC-302LL cable. These assemblies provide up to 80% space savings compared to traditional FAKRA connectors and support high-performance up to 9 GHz. Ideal for automotive applications like 360-degree cameras and ADAS, as well as antennas, handheld devices, and drones, they offer secure, low-engagement force connections with a compact, modular design and universal Z color coding.
Nex10 Adapter Series
Amphenol RF's Nex10 Adapter Series features ruggedized, compact 50 ohm adapters offering reliable low PIM performance up to 6 GHz. These lightweight, threaded adapters are ideal for high-density applications such as antennas, small cells, distributed antenna systems (DAS), MIMO, and 5G/LTE, designed to reduce interference and maintain network quality.
MHF I LK Ultraminiature Cable Assemblies
Amphenol RF's Locking MHF I Cable Assemblies feature a patented locking system for tamper-resistant, vibration-resistant performance, available with waterproof IP67 options. These 50 ohm assemblies are ideal for applications such as drones, GPS, and industrial automation, offering reliable electrical performance up to 6 GHz with configurations including SMA, RP-SMA, TNC, and RP-TNC connectors.
Amphenol RF Locking MHF 4 Ultraminiature Cable Assemblies Datasheet
The Amphenol RF Locking MHF 4 Ultraminiature Cable Assemblies datasheet describes pre-configured, vibration-resistant 50-ohm cable assemblies featuring the I-PEX MHF® 4 LK locking connector. These ultraminiature assemblies are designed with tamper-resistant, waterproof (IP67) options and utilize 1.37 mm micro-coax cable paired with SMA or RP-SMA connectors for reliable electrical performance in rugged environments. Ideal for continuous shock and vibration applications, they are used in UAVs, IoT devices, military systems, smart agricultural equipment, and communication networks. The datasheet also outlines available standard lengths (50–400 mm) and key specifications, including a frequency range up to 9 GHz, 500 mating cycles minimum, and materials such as gold-plated brass and PTFE insulation.
Amphenol RF PFAS-Free SMA Connectors & Adapters
Amphenol RF’s PFAS-free SMA connectors and adapters, engineered with eco-friendly PEEK insulators as drop-in replacements for traditional PTFE-based designs. This product line delivers comparable or improved performance, enhanced thermal stability, and full compatibility with existing SMA solutions, offering a sustainable RF interconnect option for demanding applications.
Amphenol RF MCX Cable Assemblies RG-174 Wireless Communication Modules Datasheet
The Amphenol RF MCX Cable Assemblies Data Sheet highlights between-series board-to-panel cable solutions designed for wireless communication modules. These assemblies combine compact MCX interfaces with rugged, sealed bulkhead connectors to enable reliable RF connectivity in space-constrained and environmentally exposed applications.
Amphenol RF MMCX Cable Assemblies RG-174 for Wireless Modules
The Amphenol RF MMCX cable assemblies datasheet outlines pre-configured 50-ohm RF cable solutions using flexible RG-174 coax for reliable connections in wireless communication modules. It highlights available connector configurations, electrical performance characteristics, and suitability for applications such as IoT, GPS, Wi-Fi, and other compact RF systems.
Amphenol RF MCX Cable Assemblies RG-316 Wireless Communication Modules Datasheet
This datasheet highlights Amphenol RF’s MCX cable assemblies for wireless communication modules, featuring between-series board-to-panel configurations built on flexible RG-316 cable for reliable performance up to 6 GHz. The assemblies combine MCX straight or right-angle plugs with rugged, IP67-rated bulkhead connectors—including SMA, RP-SMA, TNC, RP-TNC, and N-Type—designed to provide secure, sealed connections that protect systems from temporary water and fluid ingress. Optimized for short-distance RF applications, these cable assemblies offer high heat resistance, durability, and low signal loss, making them well-suited for portable IoT devices, drones, GPS/GNSS, Wi-Fi, and demanding industrial, agricultural, and construction environments, with a wide range of standard and custom cable lengths available.
SMA to Unterminated Cable Assemblies Datasheet
Amphenol RF’s SMA to unterminated cable assemblies provide a highly flexible 50-ohm solution designed to support efficient RF system integration and custom termination requirements. Built on a range of flexible and conformable cable types, these assemblies enable engineers to hand-form routing paths and terminate to the connector or interface of their choice, delivering maximum design versatility. The SMA interface ensures a secure, reliable connection with broad compatibility across standard RF equipment, making these assemblies well-suited for demanding applications such as test and measurement, aerospace and prototype development. With multiple standard lengths available and robust construction supporting performance up to 18 GHz, these SMA pigtail assemblies offer a dependable and adaptable solution for high-frequency design environments.
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