Patent ID: 6059172
Filing Date: 2000-05-09
Classification: B23K,H01L,H05K,Y02P

Abstract:
A method for establishing electrical communication between a first and second object, comprising:a) obtaining a first object in electrical communication with at least one ball limiting metallurgy structure (BLM) containing a low melting point solder, wherein at least one of said BLM is in contact with a high melting point solder ball coated with a low melting point solder and wherein the low melting point solder is contacting each solder ball over at least the portion of the solder ball not in contact with the BLM;b) interacting a second object having at least one attachment point corresponding to one of the solder balls on the first object where electrical communication is desirable and wherein the solder ball and corresponding attachment point are proximally situated and wherein the solder ball is capable of forming an electrical communication with the corresponding attachment point; andc) reflowing the first object and the second object while the first object and the second object are interacted, and wherein the first object and the second object are in electrical communication and are physically connected,and wherein at least one of the solder balls on the first object is in physical contact with the corresponding attachment pad during the step of interacting of the first and second object.