Wednesday July 17, 2019 Logo


Introduction to the new SFF8639 Connector for Backplanes.  SFF 8639 is an extension of the 8482 SAS Connector which has higher signal quality requirements (to support 12Gb/s SAS and gen 3 PCIe) and adds support for SATA Express and 4 lanes of MultiLink SAS or PCI Express.

The connector has a total of 6 High Speed signal paths, strangely each specification only ever uses up to 4 of them at any time.


The standard defines a backplane connector that is designed to support the following interfaces:




Whilst the connector is physically compatible with all of the drive types listed above, systems using this connector will probably only support a subset of these interfaces.

Information reproduced from the SFF 8639 specification downloadable from the SFF Commitee website

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