Jingsong Xie, Craig Hillman, Peter Sandborn, and Michael Pecht
CALCE Electronic Products and Systems Consortium
University of Maryland
College Park, MD 20742
Sun Mircosystems Computer Company, Palo Alto, CA 94303
Thomas & Betts, Attleboro Falls, MI 02763
The contact resistances of 2,300 elastomer button contacts used for LGA (land grid array) package interconnections were measured over a range of contact loads. The experimental data, fitted using three probability distribution functions, show that an inverse Gaussian distribution best describes elastomer button contact resistance behavior. Using this probability function, the minimum operating contact load necessary for a desired socket operating reliability can be determined.
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