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D-sub (or sometimes D-shaped) connectors and backshells are cylindrical connectors used in a variety of applications. They are especially useful in creating interconnections between electronic circuits, such as for video, audio, and telecommunication systems.

A D-sub connector consists of a metal shell that encloses pins or sockets. The connectors are typically available with a range of pin sizes and configurations, ranging from 9 to 50 pins, and can be purchased as either single, double, or triple connectors. Double and triple connectors feature two or three “slots” in the metal enclosure. A hood or housing allows for the connector to be mounted to a circuit board.

The hood of a D-sub connector is designed to cover the pins in the connector and provide strain relief. The hood is also used to secure the connector to a circuit board, by either soldering the hood to the board, or through a screw-down retaining mechanism. The hoods typically come in either plastic or metal materials.

The most common type of backshells used with D-sub connectors are called “molded” backshells. These are constructed from plastic and are used to protect the wires within the connector from damage. The backshells are also designed to provide strain relief and to ensure that the wires remain securely in place. The backshells can be purchased with either a male or female thread.

The working principle of a D-sub connector is relatively simple. The connector is designed to create an electrical connection between two electronic circuits by creating an electrical current path between different pins or sockets in the connector. When the connector is inserted into a mating socket, the electrical current is redirected to the appropriate pins or sockets, allowing the electrical connection to be created.

D-sub connectors and backshells are widely used in a variety of applications. They are commonly found in the automotive, aerospace, military and medical industries and are used for data and signal connections. In addition to being used in applications such as computers, televisions and video displays, D-sub connectors are also widely used in instrumentation and test laboratories.

D-sub connectors are available in a range of sizes and configurations, and can be purchased pre-assembled with hoods, molded backshells, and other accessories. The connectors are easy to install and maintain, making them a popular choice for many applications. They provide a reliable and cost-effective way to make electrical connections between different circuits.

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