The TNC connector is the threaded version of the BNC RF connector, the full English name is Thread Neill-Concelman (threaded connector), for use in small and medium power applications.    The TNC series of products are developed and produced in accordance with the US military standard MIL-C-39012, which meets the requirements of the national military standard GJB681, and the connecting thread is 7/16-28UNEF. Therefore, it can be interconnected with similar products at home and abroad.    TNC type radio frequency connector, working frequency up to 6GHz, with low voltage standing wave ratio, stable performance, high reliability, etc., widely used in mobile phones, aviation control, telemetry, Bluetooth and GPS components, wireless base stations, microwave communications, radars, networks Equipment, antenna support, machine-to-machine communication, security equipment, testing equipment, etc.     The structure of the TNC connector is divided into two types, male or female, with standard polarity or reverse polarity, and the impedance specification is 50 ohms.    The shape is divided into straight type or 90 degree right angle type, partition type, 4-hole panel type or installation-free type.    The termination methods of these TNC coaxial connectors are clip/welding, crimping/welding, welding or welding/welding.

     SMA, 3.5mm and 2.92mm connectors all have similar mechanical characteristics which allows them to be mated to each other. However, because the dimensions of each connector are slightly different the connection is not ideal and does result in degraded electrical performance.     The outer diameter of a SMA Connector is about 4.13 mm (0.163 in) and the outer diameter of the of the other two connectors are 3.5 mm and 2.92 mm (IEEE-std-287 defines the connector interface names based on their outer diameter).     Practically, the degraded electrical performance is not very significant and can be ignored in many cases/applications. However if you are working on a very sensitive system, then you should use matching connector interfaces for connections.     A point to note when mating an SMA connector with a 3.5mm or 2.92mm connector, the SMA's pin engages first and the threads are second - Due to which the connection must be made carefully to avoid damaging the connectors. When mating the 3.5 mm and 2.92 mm connectors with SMA connectors the threads mate first and then the pin providing a more stable connection which is less likely to damage the connectors.     Similarly, 2.4mm and 1.85mm connectors are also compatible with each other. Compatible SMA 3.5mm 2.92mm 2.4mm 1.85mm SMA √ √ √ - - 3.50mm √ √ √ - - 2.92mm √ √ √ - - 2.4mm - - - √ √ 1.85mm - - - √ √