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2012 Edition, November 1, 2012

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Specification for Micro Serial Attachment 3 Gbs 4X Unshielded Connector

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Description / Abstract:

This specification defines the terminology and physical requirements for the mating interface and physical characteristics of the Micro SAS Connector System. It is designed to support high speed serial signals and power. While designed specifically for the smaller, 1.8 inch form factor drives, including solid state drives, it should not be considered as limited to those. Its use will be governed by applicable industry standards, e.g. Serial Attached SCSI (SAS).

In an effort to broaden the applications for storage devices, an ad hoc industry group of companies representing system integrators, peripheral suppliers, and component suppliers decided to address the issues involved.

The SFF Committee was formed in August, 1990 and the first working document was introduced in January, 1991.

Applicable documents

The following documents form a part of this specification to the extent indicated herein. In the event of conflict between this specification and the referenced documents, this specification shall take precedence

Industry documents

Serial ATA

Serial Attached SCSI


SFF 8482

ASME Y14.5M Dimensioning and Tolerancing

Ratings and characteristics

- Rated voltage: 30 V ac/contact

- Current rating: 1.5 amps/contact

- 80% relative humidity maximum

General description

The internal Micro SAS connector is designed to enable connection of a slim 1.8 inch form factor HDD or SDD to the SAS interface.

The internal Micro SAS connector uses the same 1.27 millimeter pitch for both the signal and power segments as the Micro SATA connector as defined in the Serial ATA Specification. In addition, it contains a second signal segment on 0.8 millimeter pitch similar to the SAS internal connector as defined in SFF 8482. It contains an optional pair of contacts opposite the primary signal contact group. This pair is for OEM use and the voltage must be at or below 5 volts. Also included is the same pair of optional manufacturing contacts as exists on the Micro SATA connector.

Care should be taken in the application of this drive so that excessive stress is not exerted on the drive or connector. Backplane configurations should pay particular attention so that the drive and connector are not damaged due to excessive misalignment.