Patent ID: 6347947
Filing Date: 2002-02-19
Classification: H01L,H05K,Y02P,Y10T

Abstract:
An enhanced ball-grid array (BGA) integrated circuit (IC), comprising:a plurality of die-attach pads open to a first surface of the IC to provide electrical signal communication to and from the IC; a plurality of first solder balls, individual ones of the first solder balls metallurgically bonded to individual ones of the die-attach pads at the first surface; a layer of protective polymeric material over and adhering to the first surface, encapsulating that portion of the die-attach pads not bonded to the first solder balls, and at least a portion of the first solder balls, leaving a portion of the first solder balls exposed; and a plurality of second solder balls, individual ones of the second solder balls metallurgically bonded to individual ones of the first solder balls at the portions left exposed; characterized in that the second solder balls present a BGA interface for the IC, and in that the layer of protective polymeric material provides lateral support for the metallurgical bonds between the first solder balls and the die-attach pads.