Patent ID: 6855578

Claim:
A method for completing an electronic assembly, comprising the steps of: providing an integrated circuit chip having a first plurality of metallic contact pads exposed, said contact pads having a pitch center-to-center of less than 180 μm; attaching a metallic bump to each of said contact pads, said bumps made of reflowable metal; providing an electrically insulating substrate having a second plurality of metallic terminal pads in locations matching the locations of said contact pads; attaching said bumps to said matching terminal pads, respectively, thereby interconnecting said chip with said substrate, spaced apart by a gap; and adding vibration energy to said electronic assembly, while filling said gap uniformly with an adherent polymeric precursor, whereby said precursor absorbs said vibration energy to eliminate voids from said precursor, to distribute fillers equally, and to ensure uniform adhesion of said precursor; increasing the temperature of said assembly to supply thermal energy for curing said polymeric precursor; discontinuing said vibration energy; and cooling the completed assembly to room temperature.