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D-sub connectors, sometimes referred to as D-shaped connectors, are found mainly in PC and PC-related products. These connectors come in different shapes and sizes, from the 9-pin D-sub interconnection found on a computer monitor to the 50-pin D-sub interconnection used to plug a joystick into a game console. The main purpose of these connectors is to enable the quick and easy interconnection of two electronic devices. They are usually seen in computer systems and communication equipment, such as routers, switches, modems, and Ethernet adapters.

The most common types of D-sub connectors are DB-9, DB-25, DE-9, and DE-15. These types of connectors are similar in design, but vary in the number of pins and contact points, as well as the size of the connector. All of the D-sub connectors feature the two-row design, with even numbers of pins on each row. The outer row of the DB-9 has 9 contacts, the outer row of the DB-25 has 25 contacts, and so on. The contacts may be straight or angled, depending on the application.

The contacts on a D-sub connector are usually made of copper-plated steel, and they are held together by a plastic housing. This housing is designed to protect the contacts from dust, dirt, and other forms of contamination. The housing also helps to prevent the contacts from shorting out, and it also makes the connector more durable and able to withstand heavy-duty use. The connectors are also available in different configurations, such as male and female.

D-sub connectors offer several advantages over other types of connectors, such as increased reliability and durability. The contacts are also designed to optimize signal integrity, allowing for a higher quality connection. The wide variety of sizes and configurations of D-sub connectors makes them ideal for many different applications, from computers to industrial equipment.

The working principle of a D-sub connector is quite simple. The contacts are sealed inside the plastic housing, and the housing is designed to be airtight, so that the contacts do not come into contact with any dust or dirt. When two connectors are mated, the contacts on one connector make contact with the contacts on the other connector. The connection is completed when the male and female connectors are mated and the contacts come into contact. The electrical connection is then established, allowing the electrical current to flow through the connection.

D-sub connectors are usually rated for a certain amount of current, depending on the size of the connector. The rated current is based on the number of contacts in the connector, and the size of the conductor that the connector is designed for. The rated impedance of the connector is also determined by these factors. As mentioned above, the connectors are available in different configurations, such as male and female, in order to fit different applications.

D-sub connectors are used in a wide variety of applications. They are commonly found in the computer industry, where they are used for connecting computers to peripheral devices such as printers, scanners, and external hard drives, as well as in wiring applications for industrial machinery. They are also used in computer networking, in order to connect network devices, such as routers and switches. In addition, they are often used in the automotive industry, for wiring systems and sensors.

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