![]() ![]() SMA connectors are rated for up to 500 mating cycles, but to achieve this it is necessary to properly torque the connector when making the connection. ![]() For that reason and that they are just rated for a limited number of connection cycles, an SMA connector is not usually a good choice for metrological applications. Variability in the construction and the mating of the connectors limit the repeatability of the connector impedance. The SMA connector uses a polytetrafluoroethylene (PTFE) dielectric which will contact along the mating plane. There are also reverse-polarity ("RP") SMA connectors in which the pin and sleeve are swapped so that the "male" RP-SMA has a center sleeve surrounded by an inside-threaded barrel, and the "female" RP-SMA has a center pin and an outside-threaded barrel. As with most other connectors, the gender assignment thus corresponds to the innermost electrical component. The male is equipped with a hex nut measuring 5/16 inch (0.3125 inch / 7.9 mm) across opposite flats, thus taking the same wrench as a #6 SAE hex nut.Ī standard-polarity SMA male connector has a center pin surrounded by barrel with inside threads, and the standard SMA female connector has a center sleeve surrounded by a barrel with outside threads. The SMA connector employs a 1/4-inch diameter, 36-thread-per-inch threaded barrel. The SMA name is also used for a superficially similar optical fiber connector. Type F cannot be mated with SMA this connection is possible using an adapter. SMA connectors can be visually confused with the standard household 75-ohm type F coax connector (diameters: Male 7⁄16 inch (11 mm) circular or hex female 3⁄8 in (9.5 mm) external threads), as there is only about a 2 mm difference overall in the specifications. It is also commonly used in radio astronomy, particularly at higher frequencies (5GHz+). SMA is designed for use from DC to 18 GHz, but is most commonly used for hand-held radio and mobile telephone antennas, and more recently with WiFi antenna systems and USB software-defined radio dongles. ![]() SMA ( SubMiniature version A) connectors are semi-precision coaxial RF connectors developed in the 1960s as a minimal connector interface for coaxial cable with a screw-type coupling mechanism. Standard male SMA connector: male body (inside threads) with male inner pin. ![]()
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