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Backplane connectors are used in the printed circuit boards (PCBs) used in a wide variety of electronic components and systems. The type of connector is selected based on the type of application, usage, and even the material of the circuitboard. The most popular types of backplane connectors are the Hard Metric, Standard, and Micro-Channel types. In this article, we will discuss the application fields and working principle of Hard Metric and Standard backplane connectors.The Hard Metric (HM) backplane connectors, also known as high-density connectors, have become the standard in today’s high-speed applications. HM backplane connectors come with a standard number of pins, and it is designed to maximize contact surface area. Such connectors can easily sustain currents of up to 4A with 5A plug inserts. Furthermore, almost no crosstalk is present due to the various shielding and lead configurations used in the connectors. The main application field of Hard Metric connectors lies in telecommunications, computer boards, signal boards, instrumentation boards, and in high-speed data transfers. Hard Metric connectors have high-density insulation displacement system, which facilitates high-speed data transfers. The working principle of Hard Metric connectors involves a series of contact pins along with pads to make up the line contact system. Furthermore, the contacts ensure a secure connection due to their flexibility and tight contact.On the other hand, Standard backplane connectors are mainly used in non-critical or low-speed applications. Standard backplane connectors feature a straight pin contact type which provides a reliable connection but is not suitable for high-speed data transfers. It also has a low installation and removal force which is suitable for routine maintenance. The main application field of Standard backplane connectors lies in telecommunications, commercial boards, computer boards, and data transmission applications. Standard backplane connectors have a low installation force and simple connection method for assembling the contact and board. The working principle of Standard backplane connectors involves a series of pins and insulated sockets. The pins insert into the sockets forming a secure connection and providing electrical continuity.To summarize, Hard Metric and Standard backplane connectors are designed for different application fields and have different working principles. Hard Metric connectors are suitable for high-speed data transfers while Standard backplane connectors are mainly used in non-critical or low-speed applications.

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