Patent ID: 7943435
Filing Date: 2011-05-17
Classification: H01L,H05K,Y02P

Abstract:
1. A method comprising: providing a first film portion of an underfill film, the first film portion having a poor thermal conductivity relative to a thermally conductive sheet of the underfill film; disposing the thermally conductive sheet on the first film portion of the underfill film, such that the underfill film includes the thermally conductive sheet; and, disposing a second film portion of the underfill film on the thermally conductive sheet, the second film portion having the poor thermal conductivity, such that the thermally conductive sheet is disposed within the underfill film, wherein the thermally conductive sheet has a coefficient of thermal expansion (CTE) substantially equal to a CTE of the underfill film, such that inclusion of the thermally conductive sheet within the underfill film does not affect a functionality of the underfill film to relax thermal stresses.