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D-subminiature connectors, also known as D-Sub or D-shaped connectors, are a type of electrical connector used in a variety of industries including aerospace, industrial, consumer electronics, automotive, and computer peripherals. They are a type of multipin connector with contacts arranged in rows. Backshells, hoods, and accessories are designed to provide electrical grounding, strain relief, and environmental protection for the contacts and wires.

D-subs come in three basic contact arrangements, named by the location of the contacts: 9-pin, 15-pin, or 25-pin. Each configuration has contacts in two rows and is referred to by the total number of pins in both rows. These contacts grouped together transfer either digital or analog signals from the device to the mating device. Today, D-sub connectors are available with up to 115 contacts.

A typical use for a 9-pin connector is PC serial ports and, for 25-pin connectors, PC printer ports or SCSI (Small Computer System Interface) ports. The 15-pin models are also used for some video signal connections. The larger connectors are used in some networking equipment, large-scale storage system externals, powered speakers, and many other applications.

The most commonly used D-sub backshells include grommet strain reliefs and metal hoods. A grommet strain relief is a rubber sleeve designed to be slid over the individual wires that exit the hood and into the backshell. This provides strain relief to the wires so they cannot easily be pulled out or damaged. A metal hood completely covers the backshell and wires, protecting them from dust, dirt, and other foreign particles.

D-sub backshells, hoods, and accessories are designed to provide electrical grounding, strain relief, and environmental protection for the contacts and wires. The D-sub backshells available for use with D-sub connectors provide the necessary protection from short circuits, electromagnetic interference (EMI) and radio-frequency interference (RFI). The metalized construction of the backshell also reduces any unintentional electrical contact between signals. Metalized backshells also provide flexibility in termination options, such as thumbnails, spring fingers, or rings.

In addition to being an important part of any electrical system, backshells, hoods, and accessories also help maintain the integrity of the signal. The shell helps to reduce strain on the contact pins, resulting in better signal integrity. Contact pins are kept secure with D-sub backshells, which prevents them from jostling loose due to airborne shock and vibration. These backshells also keep conductors in place, which reduces conductivity problems. Finally, the metal jacket helps shield the signal from noise in the environment.

D-sub backshells, hoods, and accessories are designed to provide any combination of strain relief, environmental protection, and electrical grounding necessary for a successful connection. That’s why it’s important to select the right combination of components for each application. In combination with D-sub connectors, these components can help you ensure that your project will have the right level of quality and performance.

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