78Pin D-SUB Connector 78 Way Straight PCB Female HS DSUB Connector

D-type connectors most commonly consist of two and sometimes more parallel rows of connections. The connectors have a D-format metal shell that provides mechanical strength and limited screening - the metal shells of the plug and socket make contact to provide screening. Panel mounting connectors are typically secured to the panel using nuts that have an additional thread allowing the mating connector to be secured to prevent working loose. Free connectors can have backshells that provide screening and can be connected to the cable screen, or if plastic, provide protection and strain relief.

The D-type connector has been used in many applications as a multi-way connector, but it is probably most widely known as the connector used for RS-232 serial links. In fact, the D-type connector was used for the serial link on most computers for many years, and today variations of D-type connectors are still found on most computers.

D-sub or D-subminiature connectors are common types of electrical components typically used in computing to help form connections on a circuit board.