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D-Sub, D-shaped connectors are a type of electrical connector used to connect computer and electronic devices together. They are also known as “D-subminiature” connectors because of their small size. They are commonly used in the aviation and computer industries because of their versatility and reliability. The name D-sub indicates that these connectors have a “D” shaped contact array that provides two rows of contact pins or sockets, which allows for the connection of two or more circuits.

The various types of D-Sub backshells and hoods provide a termination method for D-sub (DB) connectors which are used in different applications. The backshell is an important part of a connector as it connects a cable assembly to the connector’s body and also provides strain relief and environmental sealing. Backshells and hoods are available in a wide variety of sizes ranging from very small to large depending on the application. They are used in different methods such as screw-locking, solder-cup terminations, over-molding, and plastic wrap-around lids.

The basic working principle of D-sub connectors utilizes the principle of electromagnetic induction, with the contact pins (or sockets) of the D-sub being arranged in a circular pattern, thus forming a near-perfect circumferential shield. When mated together, the pins and sockets become conductive at the point of contact, creating an electrical connection. This connection is further reinforced by a spring-loaded mechanism which will hold the pins in a fixed position, thus completing the connection.

In aviation applications, D-sub connectors are often used in combination with backshells and hoods to provide additional shock and vibration protection as well as EMI/RFI shielding and relief. The backshell or hood is used to close the connector assembly and forms an enclosure around it to protect it from the environment. The hoods come in different sizes and materials depending on the application requirements.

In computer applications, D-sub connectors are used for various purposes such as keyboard and mouse ports, serial ports, game ports, and printer ports. The backshell or hood is used to protect the connector and cable assembly and is usually fitted to the outer side of the connector body. The backshell or hood also helps to provide strain relief for the cable assembly.

In summary, D-sub, D-shaped connectors are a versatile and reliable type of electrical connector that can be used in a variety of applications. The different types of backshells and hoods come in a wide range of sizes and materials and are used to provide additional protection and strain relief to the connector and cable assembly. The basic working principle of a D-sub connector utilizes the principle of electromagnetic induction, with the contact pins arranged in a near-perfect circular shape, which when mated together complete the electrical connection.

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