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Backplane Connectors - Hard Metric, Standard

Backplane connectors are specialized connectors used in computing and communications systems for interconnecting daughter cards (electronic boards) with the main circuit board in a backplane configuration. Also known as circuit board connectors, these devices are designed for reliable high-speed and high-density connections. Hard metric and standard backplane connectors are two of the most popular varieties of backplanes.

Each type of backplane connector comes with specific advantages, depending on the application. Hard metric backplane connectors are used for high-speed applications with signaling rates up to 25 Gb/s. These connectors are compliant with the OpenVPX electrical specification, are suitable for use in rugged applications such as for data storage systems, and are used for high-speed devices. On the other hand, standard backplane connectors are used for signaling rates up to 16 Gb/s. These connectors can support multiple signal types and are used for applications requiring more flexibility.

Backplane connectors, whether hard metric or standard, are designed to improve performance, reduce costs, and increase reliability and scalability of systems. They are marketed for their ability to support advanced signaling rate protocols, support multiple signal types, reduce crosstalk, provide greater device density, and minimize susceptibility to electromagnetic interference (EMI).

Working Principle of Hard Metric Backplane Connectors

Hard metric backplane connectors use an alternating row structure that enables a signal to propagate through two rows of contacts. This technique also prevents direct connections between adjacent rows. As a result, hard metric backplane connectors support higher signaling rates and provide greater signal integrity.

The connectors typically use solder and deflection arm contacts that are gold plated for better conductivity and resistance to corrosion. The connectors have a thin-film interface design that reduces signal loss by providing a low impedance path between the connector and the circuit board.

Working Principle of Standard Backplane Connectors

Standard backplane connectors are designed with a single row of contacts. They have similar characteristics to hard metric connectors but cannot support as high signaling rate protocols. They also have fewer mechanical parts and are less expensive than hard metric connectors.

The connectors are typically made with gold plated contacts and have a thin-film interface. They also support multiple signal types, including AdvancedTCA®, CompactPCI®, and VME64x. They are suitable for applications requiring flexibility and reliability.

Conclusion

Backplane connectors are powerful interconnect solutions used in a variety of applications. Hard metric and standard backplane connectors have distinct advantages and features depending on the specific application requirements. Hard metric connectors offer high-speed performance, while standard connectors provide flexibility and lower cost. As such, selecting the right type of backplane connector for specific applications is an important decision that requires careful evaluation.

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