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D-Sub, D-shaped connectors (also known as DB or DA connectors) are very popular connectors that come in a variety of configurations, including hermaphrodite, plug and socket, and side-entry. The contacts used in these connectors are sturdy and relatively easy to install, making them ideal for a variety of applications. The contacts in D-shaped connectors can be soldered or crimped, and they are available with a number of termination options, such as direct cable mount, panel mount, IDC or screw terminals.

The basic configuration of a D-Sub contact is a pin or socket with two "arms" extending from the base. The arms have a series of contacts that can be used to carry electrical signals, and often also serve as strain relief for the connection. When two connectors with corresponding contact patterns are mated, there is a series of contacts that create a reliable electrical connection. The contacts can be soldered or crimped to a variety of cables, including coaxial, twist pair and quad shielded.

The contact patterns used in D-Sub connectors are generally symmetrical, meaning that when two connectors are mated, the contacts on each side are in the same position. This makes it relatively easy to replace a damaged connector without needing to adjust or reorganize the contact patterns. The contacts in a D-Sub connector typically consist of two pieces: the contact itself, and a secondary piece (often referred to as a “keeper”) which secures the contact in place. The contact and keeper are usually held together with a small rivet, allowing them to be replaced without the need to open or disassemble the connector.

D-Sub connector contacts are usually shaped to direct the electrical current from the center of the contact to the outer edges. As the current flows away from the contact, it creates a magnetic field around the contact which helps ensure a reliable connection. This magnetic field also helps to keep the contacts located in the same position, making them less likely to become misaligned or damaged.

The contacts in a D-Sub connector can be used for a variety of purposes, including power, signal, and ground connections. They are typically rated for operation at higher voltages and currents than other types of connectors, and can be used for high frequency and other specialty applications, such as for use in RF or microwave circuits. D-Sub connectors can also be used in high temperature, corrosive, and other challenging environments.

D-Sub connectors are very popular, and are used in a variety of industries, from consumer electronics to industrial automation. The contacts used in D-Sub connectors are generally easy to install, and they’re available in a variety of termination options, making them suitable for a wide range of applications.