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D-subminiature or D-sub is a common type of electrical connector. It is named for its D-shaped metal shield. Developed by Cannon in 1952, the D-sub family provided a durable, versatile and inexpensive alternative to flat and circular connectors on the application field. D-sub connectors are popular among modern electronic system, such as personal computers, workstations, industrial equipment, mass storage, and networking.

Contacts: A D-sub consists of a connector shell with multiple contacts usually made of brass or phosphor bronze. For most applications, the D-sub contacts are plated with gold for superior corrosion resistance, although other platings can be used. The pin or socket contacts are available in male (pin) and female (socket) versions.

The D-shaped connector shell is made of high-grade plastic or metal to help provide protection against EMI and other environmental factors.

Working Principle: D-sub is a well-designed connector. It has a unique construction with two rows of contacts. One row of pins is called the ground row and the other row of pins are for signal/data transmission. The shell of the D-sub is made of metal or plastic, which provides the connector with effective protection against environmental factors such as shock, dust, corrosion, and EMI. In addition, the shell also provides electrical shielding and improves contact force retention. When mated, contact detents, pin or sockets, ensure a secure connection.

The working principle of the D-sub is simple, as it offers reliable connections with tight tolerance and secure latching. In most applications, the D-sub connectors are plated with gold for superior corrosion resistance. As the connector is mated, a secure connection is established and electrical signals can be transmitted through the contacts. The D-sub connector is designed for quick and easy connections and disconnections, making it ideal for applications where frequent re-connections are required.

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