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D-sub, D-shaped connectors are a type of electrical connector that is common in many computing and consumer applications. They are easy to use and are very cost effective. The most common features of a D-sub connector are a plastic back shell, hoods, locking pins, and a pin-count of up to 80 contacts.

The backshell of a D-sub connector serves two purposes. First, it provides support for the contacts of the connector by providing a stable base layer for the connection. Secondly, the backshell acts as an environmental seal to protect the contacts from dirt, dust, and other external damage. The most common material for a backshell is plastic but there are other backshell materials available that are better suited for particular applications. It is also common for the backshell to contain a strain relief feature which clamps down on the cable used to connect the connector to its mating port, providing additional safety and strength to the connection.

The hood of a D-sub connector is a metal or plastic casing that surrounds the backshell and contacts. These hoods not only provide further protection from the environment for the contacts, but they also provide strain relief when connected to a mating port. There are several different types of hoods available, such as straight, angled, and screw-on. Each type of hood is designed to meet specific requirements and provide different levels of protection and strain relief.

Locking pins are also common in D-sub connectors. These pins are designed to hold the hood in place and keep the connection secure by preventing accidental disconnects. The pins are usually crimped into place and then the hood is added over the pins. This ensures that the connection remains secure, even if it is bumped or moved around.

The most important feature of a D-sub connector is the number of contacts it contains. Most D-sub connectors have up to 80 contacts, though some have more or fewer. The specific number of contacts needed depends on the application and the connection requirements. It is important to ensure that the application is compatible with the connector\'s pin-count so that the connection is strong and reliable.

In summary, D-sub, D-shaped connectors are an economical and reliable choice for many different applications. They are easy to use, often cheaper than other electrical connectors, and provide adequate protection from the environment. The backshell, hoods, and locking pins provide additional support and security, while the contacts provide the power or data needed for the application. The number of contacts will depend on the application and the connection requirements, so be sure to research the specific connector needed for the job.

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