Patent ID: 7936060
Filing Date: 2011-05-03
Classification: H01L

Abstract:
1. An electronic device assembly comprising: a substrate, the substrate comprising a first material having a first thermal expansivity; an integrated circuit chip, the integrated circuit chip comprising a second material having a second thermal expansivity, the second thermal expansivity being different from the first thermal expansivity, wherein there is a coefficient of thermal expansion mismatch between the first material of the substrate and the second material of the integrated circuit chip; an interposer coupled to the substrate, the interposer comprising the second material having the second thermal expansivity, and being coupled to the substrate via a first plurality of electrical contacts and an adhesive material at least partially surrounding the first plurality of electrical contacts, the adhesive material bonding the interposer to the substrate and reducing strain on the first plurality of electrical contacts resulting from the coefficient of thermal expansion mismatch between the second material of the interposer and the first material of the substrate, wherein the interposer comprises a first thickness and the integrated circuit chip comprises a second thickness, the second thickness being greater than the first thickness; a second plurality of electrical contacts coupling the integrated circuit chip to the interposer without use of adhesive material at least partially surrounding the second plurality of electrical contacts, and wherein the second plurality of electrical contacts coupling the integrated circuit chip to the interposer without use of adhesive facilitates reworking of the electronic device assembly by facilitating removal of the integrated circuit chip from the interposer, the second plurality of electrical contacts being reworkable at a lower temperature than the first plurality of electrical contacts.