3.5 mm RF Connectors Guide: Types, Structure, and Uses Explained
What are 3.5mm RF Connectors?
The 3.5 mm RF connector is a high-frequency, precision coaxial connector designed for applications up to 26.5 GHz. It features a 50 Ω impedance and a threaded coupling mechanism, ensuring stable signal transmission and secure connections.
It is mechanically compatible with SMA connectors while offering improved durability and performance due to its air dielectric structure. This makes it suitable for test and measurement environments, RF laboratories, and applications requiring reliable and repeatable performance.
3.5 mm RF Connector Compatibility with SMA and 2.92 mm K Connectors
3.5 mm RF connectors are mechanically compatible with SMA and 2.92 mm (K-type) connectors,
allowing inter-mating in many test and measurement setups.
However, due to slight differences in mechanical tolerances and pin diameters,
frequent coupling can cause looseness or signal instability.
For high-precision or repeated measurements, using dedicated adapters is recommended.
Typical usable frequencies are up to 18 GHz for SMA, 26.5 GHz for 3.5 mm, and 40 GHz for 2.92 mm K connectors.
Browse 3.5mm RF Connectors by Product Type
Find 3.5mm RF connectors by type and quickly navigate to the right product category.
Can't find the right 3.5mm RF connector? We're here to help.
Find High-Frequency Test Cables (Up to 26.5 GHz)
We offer a range of high-frequency test cables with 3.5 mm connectors, which can be combined with others, including SMA connectors. Please contact us for specifications.
TC-055: Ultra-Low-Loss, Heat-Resistant
This cable features low loss with a minimal dielectric loss tangent, ensuring stable transmission under severe conditions, including extreme temperatures. Its loss, reflection, and phase remain stable even when the cable is bent. Furthermore, it exhibits minimal phase change with temperature variations, and its triple shielding provides superior noise immunity.
A variety of connectors are available, including SMA (plug, L-plug, jack), N (plug), and 3.5 mm (plug, jack). In addition to the standard model, we also offer an armored version with stainless-steel tubing reinforcement and a heat-resistant version rated for 200 °C.
Please see the following pages for detailed cable specifications and electrical characteristics.
TC-205: Low-Loss, Low-Cost
Measurement cable with excellent cost performance. Offers low loss with top-level dielectric loss. Ensures stable transmission in harsh conditions like temperature changes. Loss, reflection, and phase remain stable even when bent; phase change is minimal with temperature; triple shielding provides strong protection.Connectors available: SMA (plug, L-plug, jack), N (plug), and 3.5 mm (plug, jack).
Please see the pages below for detailed cable specifications and electrical characteristics.
TC-048: 40-GHz-Compatible
The TC-205 is a high-performance, triple-shielded cable for 40 GHz measurements, ideal for network analysis due to its low loss and high phase stability against bending and temperature. Connector options include 2.92 mm, SMA, and 3.5 mm (plug and jack), with a non-magnetic 2.92 mm plug also available.
For detailed specifications and electrical characteristics, see the pages below.
3.5mm Type RF Connector Features
High frequency
Our 3.5 mm connectors operate from DC to 26.5 GHz. Using an air dielectric instead of Teflon®, this design supports higher frequencies and provides superior performance compared to SMA connectors.
Compatibility
The 3.5 mm connector is interchangeable with SMA and 2.92 mm connectors in inner conductor diameter and can mate with them.
Compact Size
The small connector size allows high-density mounting in tight spaces, suitable for wiring inside equipment as well as connections between subassemblies and equipment.
3.5 mm RF Connectors: Applications
3.5 mm RF connectors are widely used in high-frequency environments where precision, durability, and reliable performance are required.
Typical applications include test and measurement systems such as network analyzers, where stable signal transmission up to 26.5 GHz is critical. They are also used in aerospace and defense equipment, including radar and communication systems, where consistent performance under demanding conditions is essential.
In addition, 3.5 mm connectors are commonly found in laboratory setups, RF test benches, and high-frequency communication systems. Their compatibility with SMA connectors, combined with improved durability, makes them a practical choice for applications requiring frequent connections and long service life.
RF Connector Frequency Comparison
The following RF connectors are commonly used in high-frequency applications, each with different frequency ranges and characteristics.
1.0 mm: Up to 110 GHz
1.85 mm (V): Up to 67 GHz
2.4 mm: Up to 50 GHz
2.92 mm (K): Up to 40 GHz
3.5 mm: Up to 34 GHz
SMA: Up to 18 GHz
Higher-frequency connectors offer better performance but typically require more careful handling and precise alignment.
How to Choose 3.5 mm RF Connectors
When selecting 3.5 mm RF connectors, it is important to consider frequency performance, compatibility, and mechanical durability. These connectors are widely used in high-frequency applications and are known for their precision and SMA compatibility.
1. Check Frequency Requirements
3.5 mm connectors typically support frequencies up to 26.5 GHz, making them suitable for RF and microwave applications.
Choose connectors that meet your system’s frequency requirements to ensure stable signal transmission.
2. Confirm Compatibility with SMA
3.5 mm connectors are mechanically compatible with SMA connectors but offer higher durability due to their air dielectric structure.
They are ideal when you need SMA compatibility with improved performance and longer mating life.
3. Select the Appropriate Connector Type
Choose the connector type based on your application:
Cable Connectors for flexible or semi-rigid cables
PCB Connectors for board-mounted designs
Adapters for connecting different interfaces
Right-angle connectors are suitable for compact layouts, while straight connectors are ideal for direct connections.
4. Consider Durability and Mating Cycles
3.5 mm connectors are designed for repeated use and offer a longer mating life compared to SMA connectors.
For test and measurement environments, choose connectors with high durability and stable performance over repeated connections.
5. Match Cable and Impedance
Ensure the connector matches your cable type and impedance (typically 50 ohms).
Proper matching helps maintain signal integrity and reduces reflection and loss.
2.92 mm (K) vs 3.5 mm vs SMA RF Connectors
2.92 mm (K), 3.5 mm, and SMA RF connectors differ in frequency performance and compatibility.
2.92 mm supports up to 40 GHz and is compatible with SMA and 3.5 mm connectors.
3.5 mm supports up to 34 GHz and offers higher precision than SMA.
SMA connectors typically support up to 18 GHz and are widely used in general RF applications.
2.92 mm is best for flexible system integration, 3.5 mm for precision measurement, and SMA for general-purpose use.
3.5 mm RF Connectors: Standards and Technical Specifications
Complies with international standard IEC 61169-23.
IEC 61169-23
Nominal Impedance
Impedance rating is 50 Ω, indicating compatibility with most standard RF equipment.
Coupling Method (Connection)
Connectors securely join using threaded coupling 1/4-36 UNS-2A, 2B for stable signal transmission.
Working Voltage (Rated Voltage)
Rated for standard operating voltage of up to 335 V alternating current.
Maximum Withstanding Voltage
Safely withstands up to 1,000 V alternating current for one minute without electrical breakdown.
Insulation Resistance
Minimum insulation resistance of 5,000 MΩ when tested with 500 V direct current, ensuring electrical safety.
Contact Resistance
Maximum contact resistance of 3.0 mΩ (center) and 2.5 mΩ (outer) when conducting direct current of 1 ampere, ensuring efficient connection.
Frequency Range
Suitable for signals within frequency range from DC to 26,500 MHz (26.5 GHz)
Note: The figures provided are typical values. For further details, please contact us.
3.5 mm RF Connector FAQs
QWhat is the difference between SMA connectors and 3.5 mm connectors?
QWhat is the difference between SMA connectors and 3.5 mm connectors?
The 3.5 mm connector has a 3.5 mm outer diameter and uses an air dielectric. This allows a higher waveguide mode cutoff frequency, supporting operation from DC to 26.5 GHz.
> SMA
> 2.92mm K
QWhy is there a conversion connector for SMA connectors if they are compatible?
QWhy is there a conversion connector for SMA connectors if they are compatible?
SMA, 3.5 mm, and 2.92 mm connectors are compatible and can mate. Between-series adapters are useful at research facilities, universities, and other sites requiring precise measurements.
QDo you offer connectors for applications requiring higher frequencies or smaller sizes?
QDo you offer connectors for applications requiring higher frequencies or smaller sizes?
When your application pushes beyond the 40 GHz limit of 2.92 mm (K) connectors, choosing the right interconnect is critical. We offer a portfolio of high-frequency, precision connectors designed for superior signal integrity at millimeter-wave (mmWave) frequencies.
For the highest performance requirements, we recommend:
- Up to 110 GHz: 1.0 mm Connectors
- Up to 67 GHz: 1.85 mm (V) Connectors
- Up to 50 GHz: 2.4 mm Connectors
Each series offers a range of robust and reliable options for your specific design.
QWhy use an air dielectric?
QWhy use an air dielectric?
An air dielectric lowers signal loss and raises the waveguide mode's cutoff frequency. This results in improved signal clarity and enhanced performance at high frequencies.
QAre 3.5-mm connectors compatible with other types?
QAre 3.5-mm connectors compatible with other types?
Yes. Our 3.5-mm connectors are mechanically compatible with SMA and 2.92-mm (K) connectors, allowing them to be mated together.
QWhy should I use conversion adapters?
QWhy should I use conversion adapters?
Although SMA, 3.5-mm, and 2.92-mm connectors are mechanically mateable, using a precision adapter is highly recommended, especially in test and measurement environments. An adapter ensures a reliable electrical transition and protects the connectors from potential damage, guaranteeing optimal and consistent performance.
QWhat applications are suitable for 3.5-mm connectors?
QWhat applications are suitable for 3.5-mm connectors?
They are ideal for high-precision applications requiring reliable performance up to 26.5 GHz, including test and measurement equipment (e.g., vector network analyzers), satellite communication systems, and military and aerospace hardware.
QWhat standards do they meet?
QWhat standards do they meet?
Our 3.5-mm connectors conform to the IEC 61169-23 standard, ensuring full mechanical and electrical compatibility with other compliant connectors.
QWhat is the impedance?
QWhat is the impedance?
These connectors are designed with a characteristic impedance of 50Ω to ensure optimal signal fidelity.
QHow do they couple?
QHow do they couple?
They feature a threaded coupling mechanism (1/4-36 UNS-2A for the plug and 1/4-36 UNS-2B for the jack) that provides a secure and stable connection.
QWhat are the voltage ratings?
QWhat are the voltage ratings?
They have a working voltage rating of 335 V AC and a dielectric withstanding voltage of 1,000 V AC for one minute.
QWhat is the insulation resistance?
QWhat is the insulation resistance?
The insulation resistance is a minimum of 5,000MΩ when measured at 500 V DC.
QWhat are the contact resistance values?
QWhat are the contact resistance values?
The maximum contact resistance is 3.0mΩ for the center contact and 2.5mΩ for the outer contact.
QHow can I order 3.5-mm RF connectors, and what support do you offer?
QHow can I order 3.5-mm RF connectors, and what support do you offer?
Ordering is simple—you can purchase our 3.5-mm RF connectors directly from our website or contact our sales team for assistance. We provide comprehensive technical support, including data sheets, CAD models, and application notes, to help you select the ideal connector for your project.
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Catalog
3.5 mm RF Connectors Catalog
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