A Guide on Common Coax Connector Types

Many people find Coax Connectors confusing with so many different types it’s hard to know what they all look like and what they are for.

With this guide I’m going to detail the top most common connector types and their uses to help you understand a little better:


Connector type Frequency Limit Dielectric Comments and history
BNCBNC 4 GHz PTFE “Bayonet type-N connector”, or “Bayonet Neill-Concelman” according to Johnson Components. Developed in the early 1950s at Bell Labs. Could also stand for “baby N connector”.
SMBSMB 4 GHz PTFE “Sub-miniature type B”, a snap-on subminiature connector, available in 50 and 75 ohms.
MCXfemale-MCX-connector 6 GHz PTFE MCX was the original name of the Snap-On”micro-coax” connector species. Available in 50 and 75 ohms.
MMCXmmcx PTFE Micro-miniature coax connector, popular in the wire industry because its small size and cheap price.
SMCSMC 10 GHz PTFE Sub-miniature type C, a threaded subminiature connector, not widely used.
SMASMA 25 GHz PTFE Sub-miniature type A developed in the 1960s, perhaps the most widely-used microwave connector system in the universe.
TNCTNC 15 GHz PTFE “Threaded Neill-Concelman” connector, according to Johnson Components, it is actually a threaded BNC connector, to reduce vibration problems. Carl Concelman was an engineer at Amphenol.
N-TypeN-Type-M 11 GHz
normal18 GHz
PTFE Named for Paul Neill of Bell Labs in the 1940s, available in 50 and 75 ohms. Cheap and rugged, it is still widely in use. Originally was usable up to one GHz, but over the years this species has been extended to 18 GHz, including work by Julius Botka at Hewlett Packard.


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