Patent ID: 6194788
Filing Date: 2001-02-27
Classification: H01L,H03F,H05K,Y02P,Y10T

Abstract:
An integrated circuit assembly which comprises:a) an integrated circuit substrate having a top surface and an electrical contact surface, the electrical contact surface having a plurality of solderable contact sites on a surface thereof;b) a plurality of solder bumps positioned on the electrical contact surface of the substrate such that each of the solderable contact sites has one solder bump associated therewith, the solder bumps being affixed to the solderable contact sites; andc) a thermoplastic underfill material applied to the electrical contact surface of the integrated circuit substrate prior to positioning the assembly on a circuit board, the thermoplastic underfill material at least occupying a space defined between each of the solder bumps and characterized in that, upon heating to a solder reflow temperature, at least a portion of the underfill material acts as a solder flux.