Intel Corporation

Milan Djukic

Song-Hua Shi

Carlos A Gonzalez

High yield, high reliability, flip-chip integrated circuit (IC) packages are achieved utilizing a combination of heat and pressure to bond flip-chip die and to cure no-flow underfill material. The underfill comprises a filler or low coefficient of thermal expansion (CTE) material to decrease CTE of the cured underfill. The filler material can be selected from the group comprising silica, silicon oxide, silicon dioxide, silicon nitride, aluminum oxide, aluminum nitride, or a mixture thereof. The filler material may also increase the viscosity of the uncured underfill and/or increase the modulus of elasticity of the cured underfill. In some method embodiments, a thermocompression bonder is used to simultaneously provide solder bump reflow and underfill curing. Application of various methods to a component package, an electronic assembly, and an electronic system are also described.

Electronic assemblies and systems with filled no-flow underfill

Electronic assemblies with filled no-flow underfill

The present invention relates to a method of packaging a microelectronic device that, in one embodiment, uses a vacuum-assisted underfill process. One embodiment of the method uses a curing process with a tacky film disposed over the device to prevent wicking of the underfill material after the underfill material is in place. One embodiment of the method uses a curing process that utilizes a non-tacky tacky film with a curing process to prevent wicking of the underfill material after the underfill material is in place.

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Gilbert, AZ, United States of America

Milan Djukic