J.Xie and M.Pecht
CALCE Electronic Products and Systems Consortium
University of Maryland, College Park, MD 20742
Thomas & Betts, Attleboro Falls, MI 02763
Sun Mircosystems Computer Company, Palo Alto, CA 94303
This paper presents our recent studies on the mechanical behavior of conductive elastomer buttons used as interconnects for LGA/BGA (Land Grid Array/Ball Grid Array) package assemblies. Stiffness measurements and contact force relaxation measurements were conducted. In the consideration of actual operating conditions of elastomer sockets, the effects of both environmental temperature and initial contact force on contact force relaxation behaviors of elastomer buttons were investigated. The results show that initial contact force has little effects on long-term relaxation behavior of conductive elastomer buttons and temperature plays a dominant role in determining the mechanical behaviors of the elastomer buttons.
Keywords-- IC Socket, LGA (land grid array), elastomer button, mechanical behavior, apparent stiffness, stress relaxation, contact resistance.
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