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D-Sub Connectors

D-sub connectors (also known as D-shaped connectors) are a type of connector widely used in the computer, telecommunications, automotive, instrumentation, and industrial markets. D-sub connectors are characterized by having some type of contact or pin in a D-shaped shell.

Contact Types

The two main contact types are: male (plug) contacts, which are usually on the cable side, and female (socket) contacts, which are usually on the panel side. All D-sub connectors have two pieces, a plug (male) or receptacle (female) connector, which interlocks with the other half of the connector.

Types and Features

D-sub connectors come in several standard sizes, such as 9, 25, 37, and 50 pins. They can also be specified with non-standard numbers of pins. They are usually made out of plastic or metal, and they feature contacts that are connected to the metal shield. Many of them have grounding or keying features, which are used to align connectors and to enhance the noise rejection of signals.

Working Principle

D-sub connectors create an electrical connection between the two mating components by the simple process of sliding one connector into the other. When the connectors are engaged, the contacts slide into place, creating an electrical connection. The design of the two components ensures that the connector will only fit one way, and that the electrical contacts will match up properly. The contacts are held together by the metal shielding which is typically crimped or soldered onto the cable, and its grounding or keying features serve to prevent the connection from becoming loose.

Applications of D-sub Connectors

D-sub connectors are widely used in multiple applications due to their robustness, versatility, and low cost. They are commonly used to connect computers and peripherals, as well as in industrial automation, instrumentation, telecommunications, and automotive systems. They are also commonly used in applications such as in video, audio, and data processing equipment.

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