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D-sub connectors, or D-shaped connectors are widely used connectors with two rows of pins or sockets in the form of a ‘D’. Backshells and hoods are the two types of connector-housings used to contain the wiring and contacts of the system. They offer protection from dust, dirt and other debris and are important for environmental protection and safety.

Backshells are the connector-housings which are used to support the contacts without the shielding covering. It is a simple non-enclosed device which allows specific bend-relief of wires, crimp terminations for cables and is also used for strain relief. Backshells can be made from brass, stainless steel or aluminium for industrial applications, and also from dielectric materials such as nylon or polycarbonate for light- and general-duty applications.

Hoods, on the contrary, provide the necessary protection from the environment by enclosing the contacts of the connector. They are used specifically when exposed contacts and wire bundles need physical, mechanical and electromagnetic protection. Hoods are made from dielectric materials such as polycarbonate or nylon, which have superior electrical insulating properties. Furthermore, housings which are made out of metal are favoured for applications which require grounding and shielding.

D-sub connectors can be mated with either male- contact, or socket contacts despite which housing type is implemented. Male contacts are the ‘pins’ and socket contacts are the ‘sockets’. In general, the pins penetrate the sockets, and when mated, create an electrical and mechanical connection between two mating parts where the current is conducted and the contact points are mechanically secured. Additionally, the amount of pins and sockets varies from application to application.

In order to provide protection from dust and dirt penetration and in order to create a reliable electrical connection, the connectors are sealed by crimp shells over the contact sites. Additionally, in order to protect against mechanical and electrical stresses and to provide a strain relief, the connectors are covered by plastic housing. Such protection allows them to perform in harshest environmental conditions, such as high altitudes, high humidity, dust, and heavy vibration.

The D-sub connectors are used for a variety of applications, such as, high-speed harsh environment connections, Ethernet connections, power, data, signal and control lines and also provide protection in rugged environment applications. They offer secure connection, flexibility and excellent performance in a wide range of applications, including industrial and military markets. Moreover, for more demanding performance requirements, they are designed in accordance with safety and other standards.

In summary, D-sub connectors, or D-shaped connectors are widely used in applications where secure, reliable and quick connection is needed. Backshells provide bend-relief of wires and crimp terminations for cables, while hoods are used to physically, mechanically and electrically protect the contacts. Additionally, they are sealed by crimp shells over the contact sites and are constructed according to safety and other standards.

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