SO-DIMM

SO-DIMM ( Small Outline Dual Inline Memory Modules ) are memory modules that are mainly used in notebook systems. Due to its design and the high energy efficiency they are especially suitable for this purpose.

The modules ( like the larger DIMMs ) on each side of the board and separate connections are in the GDR versions 67.6 mm wide and 30 mm high. To prevent the installation of incompatible modules that have various versions scores at different points in the terminal strip.

Installation

Unlike DIMMs are used perpendicular to the board, SO- DIMMs are used at an angle and then depressed so that they lie parallel to the board, where they snap into two lateral resilient retaining tabs. In this way, very flat design of the hardware are possible.

Specifications

The standards for memory modules are approved by the JEDEC Solid State Technology Association. The different variants vary in appearance by the number of contacts and the notches in the connector. The main variants:

• SO- DIMMs, 72-pin, FPM, EDO or SDRAM chips with 5 V or 3.3 V ( since 1997)
• SO- DIMMs, 144-pin, EDO or SDRAM chips with 3.3 V ( since 1999)
• SO- DIMMs, 200-pin, DDR or DDR2 SDRAM chips ( since 2003)
• SO- DIMMs, 204 pin, DDR3 SDRAM chips ( since 2010)

The RAM module specifications are determined by various working groups of the JEDEC and collected in the standard document JESD21 -C. Meanwhile, Chapter 4, " Multi-Chip Memory Modules and Cards ," contains the official specifications for multi - chip modules, including for SO -DIMM modules:

The table of contents and other parts of the collection can be seen, for downloading the standard document but registration is required. Individual standard documents such as be made available in part by chip manufacturers.