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What is a SCA connector?

April 26, 2017connector SCA

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What is a SCA connector?

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• Answer: SCA stands for Single Connector Attachment. This connector is found in the SPI-2, SPI-3 and EPI documents of the SCSI-3 specifications and is called the non-shielded Alternative 4, P cable connector. It consists of 80 pins arranged as two rows of ribbon contacts spaced on 0.05 in (1.27 mm) centers and is meant specifically for use as the connector on devices designed to plug into hot swap backplanes. The 80 pins include all the pins of the 68-pin high density connector (shielded and non-shielded Alternative 3, P cable) plus a number of power pins, spindle sync and pins for the backplane to set the SCSI device ID. In order to use it in a cabled SCSI system, you must purchase an 80-pin SCA to 68-pin (or 50-pin) high density connector adapter. This adapter brings out the SCSI pins for the 68-pin connector, the pins for powering the drive and the pins for setting the device ID. These adapters add a lot of capacitance and may cause problems if you use more than two or three in a b