Patent ID: 6071371
Filing Date: 2000-06-06
Classification: H01L,H05K,Y02P,Y10T

Abstract:
A method for simultaneously attaching an adhesive-bonded IC device and a solder-bonded IC device to a substrate, the method comprising the steps of:placing a first IC device and a second IC device on a circuit board, an adhesive being present between the first IC device and the circuit board, the adhesive having a cure temperature and a cure time by which the adhesive is fully cured at the cure temperature, a solder composition being present between the second IC device and the circuit board, the solder composition having a liquidus temperature above the cure temperature of the adhesive;heating the circuit board and the first and second IC devices through at least one thermal cycle so as to simultaneously cure the adhesive and reflow the solder composition to form a molten solder joint between the second IC device and the circuit board, the thermal cycle attaining a peak temperature above the cure temperature of the adhesive and above the liquidus temperature of the solder composition for a duration less than the cure time of the adhesive; and thencooling the circuit board and the first and second IC devices such that the molten solder joint solidifies.