Patent ID: 6943058
Filing Date: 2005-09-13
Classification: C08K,H01L

Abstract:
1. A method of underfilling a bumped circuit component with a no-flow underfill material, the method comprising the steps of: forming the no-flow underfill material to comprise a dielectric polymer material containing a precursor, the underfill material being substantially free of an inorganic filler; dispensing the underfill material over terminals on a substrate; penetrating the underfill material with bumps on the circuit component so that the bumps contact the terminals; heating the bumps so that the bumps melt; and then cooling the molten bumps so that the molten bumps form solid electrical interconnects that are metallurgically bonded to the terminals, the underfill material forming an underfill layer that encapsulates the interconnects and contacts both the circuit component and the substrate; wherein the precursor is reacted to form an inorganic filler having a CTE lower than the CTE of the dielectric polymer material.