Pan Pacific Symposium Conference Proceedings


Authors: Sameer Jain, Daryl Santos, Ph.D., and Brian Lewis, Ph.D.
Company: SUNY Binghamton, and Cookson Electronics
Date Published: 1/31/2007   Conference: Pan Pacific Symposium

Abstract: As the electronics industry is moving towards lead-free solders, most replacement alloys that have received serious consideration have peak reflow temperatures of 20oC or higher than their lead-based counterpart. This is not surprising to most manufacturers and, in general, most companies do not have to modify assembly equipment (namely reflow ovens) to handle this change: what does become an issue, however, are heat-sensitive components. Many manufacturers, particularly contract electronics manufacturers, must deal with lead-based process compatible parts (a.k.a., legacy parts) that cannot be subjected to these higher temperature extremes. Cookson Electronics has developed a family of thermal management devices, known as “CoolCaps” to help protect heat-sensitive components during assembly and rework operations. A CoolCap is made of a hydrated inorganic material that contains bound water or a combination of both bound water and absorbed water and acts to protect (shield) a heat-sensitive component when it is in an environment (e.g., lead-free process temperatures) for which it was not originally designed. This work details recent materials research, performed to understand the operational envelope, particularly for the pick-and-place operation of CoolCaps. Experiments detailing the material’s process window in terms of its pick-and-place ability, thermal efficacy and mechanical strength with the use of different “additive materials” together with CoolCap results in protecting heat sensitive components are discussed. Key words: Lead-free assembly, heat sensitive components, CoolCaps, thermal management, reflow issues.

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