What is a SMA RF Connector?

SMB (Subminiature Type B) connectors are smaller than SMA (Subminiature Type A). SMBs use a snap-on coupling, making them easier to connect but more prone to disconnection and vibration issues. In contrast, SMA connectors use a threaded coupling, ensuring a more secure connection.

SMB connectors also operate at lower frequencies than SMA connectors. When choosing between them, consider both electrical performance and installation requirements.

MCX and MMCX connectors are similar in size to SMB and use a snap-on mechanism.

> SMB
> MCX
> MMCX

In standard RF connectors, plugs have male contacts, and jacks have female contacts. Reverse polarity SMA (RP-SMA) connectors swap these with plugs featuring female contacts and jacks featuring male contacts. RP-SMA is commonly used in radio communication equipment outside Japan.

> Reverse Connectors

Standard SMA connectors support up to 18 GHz. Specialized cable processing and measurement tools are required for higher frequencies, so we cannot guarantee standalone connector performance. However, upon request, we offer cable assemblies designed for frequencies up to 26.5 GHz.

> High Frequency Test Cables

Yes, 3.5 mm and 2.92 mm (K) connectors are smaller than SMA connectors while remaining compatible. These connectors also support frequencies beyond 18 GHz.

We offer a lineup including TC series measurement cables, 3.5 mm connectors, and 2.92 mm (K) connectors.

> 2.92mm K
> 3.5mm
> High Frequency Test Cables

Although SMA, 3.5 mm, and 2.92 mm connectors are compatible and can be mated, between-series adapters ensure optimal performance for precise measurements. These adapters are widely used in research labs, universities, and other high-precision environments.

> Between Series SMA-3.5mm
> Between Series SMA-2.92mm K

Yes, quick-connect adapters allow fast and tool-free connection of threaded connectors, improving efficiency in testing and measurement environments. These adapters are available for N and SMA connectors.

> Quick adaptors for Measurement

Yes, we offer waterproof SMA connectors with varying IP ratings. Waterproofing features include:

1. Sealing at the connector mating interface
2. Waterproofing at the cable attachment point
3. O-ring sealing at the cable entry
4. O-ring sealing for flange-mounted connectors

For details, browse our waterproof SMA connector options.

> SMA Waterproof

While SMA connectors are primarily designed for RF (Radio Frequency) applications, they can also be used in DC circuits, especially when handling low-power or low-frequency signals. However, connectors specifically designed for DC power should be considered for high-power DC applications to ensure safety and proper performance.

To clean SMA connectors, use a soft brush or a lint-free cloth, isopropyl alcohol, or a mild contact cleaner. Do not use abrasive materials that could damage the connector’s surface or compromise its electrical contact. For connectors exposed to harsh environments, regular cleaning is important to maintain the integrity of the connection and minimize performance loss.

SMA connectors are typically made from materials such as brass or stainless steel. The inner contact is usually plated with gold to ensure low signal loss and good electrical conductivity. The outer shell may also be plated with gold or nickel to prevent corrosion and provide mechanical strength. For specialized applications, aluminum and other materials might be used for lighter weight or specific environmental requirements.

SMA connectors can be used in moderate-vibration environments. Still, for high-vibration conditions (such as in automotive or aerospace applications), you may need to consider more ruggedized connectors like TNC or N-type connectors, which are designed to handle more stress and mechanical strain. In such cases, choosing connectors with proper locking mechanisms or more robust designs is crucial to maintaining reliable connections.