Over the years, we’ve had many customers come to us looking to clarify RF connector types when they are specifying and purchasing RF coaxial cable assemblies.? There are many different types of connectors out there, including Type-N, UHF (aka PL-259 / SO-239) TNC, RPTNC, BNC, SMA & RPSMA.

  Most people can tell the difference between the “standard” connector types, but many people, ourselves included, find it difficult to identify the gender of?reverse polarity?connectors? Here we will do our best to help you identify the difference between male and female connectors in terms of their polarity—standard or reverse (RP).?

  Standard Polarity Coaxial Connectors.

  When trying to identify male and female connectors keep in mind the following:

  When mating a plug and a jack, it is important to ensure that both connectors have the same polarity. For example, the plug and jack should?both?be standard polarity, or both must be reverse polarity.?

  Typically, standard RF plugs are male, and?the threads are on the inside of the shell.

  Typically, standard RF jacks are female, and?the threads are on the outside of the shell.

  The shell of a plug (male) typically covers the shell of a jack (female).

  Examples – standard polarity

  A standard polarity female jack has a socket in the middle designed to receive the pin from the male plug, and the jack’s shell has threads on the outside.?Here we have shown an SMA jack, typically found on devices such as a 3G/4G/LTE cellular gateway or a GPS receiver.

  female jack

  A standard polarity male plug has a center pin that sticks out from the middle, and the plug’s shell has threads on the inside. Here we have shown an SMA plug, typically found?on the end of a coaxial cable?that connects to products such?as a 3G/4G/LTE cellular gateway or a GPS receiver.

  male plug

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  Examples – REVERSE polarity

  A “reverse polarity” female jack has a center pin that sticks out from the middle, and the jack’s shell has threads on the outside. Shown here is?a?RPSMA-Female jack, typically found on such products as a 900 MHz ISM modem, 2.4/5 GHz 802.11 WiFI / WLAN radios or access points.

  reverse polarity female jack

  A “reverse polarity” male plug has a socket in the middle designed to receive the pin from the female connector, and the plug’s shell has threads on the inside.?Here we have shown an RPSMA-Male plug, typically found?on the?end of a coaxial cable?that connects to products such as a 900 MHz ISM modem, 2.4/5 GHz 802.11 WiFI / WLAN radios or access points.

  reverse polarity male plug

  Remember:

  A?standard polarity jack?(female) has a socket, whereas a?reverse polarity jack?(female) has a pin.

  A?standard polarity plug?(male) has a pin, whereas a?reverse polarity plug?(male) has a socket.

  Connector Types and Genders

  The following table identifies for you the various types of connectors commonly used, and their genders:

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  I hope the descriptions and images have helped you understand the differences between the connector type, polarity, and gender.

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  Keep in mind that there are also “Reverse-Thread” and “Reverse-Polarity / Reverse-Thread” Connectors, but that’s a discussion for another day!!!

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