Patent ID: 6569712
Filing Date: 2003-05-27
Classification: H01L,H05K,Y10T

Abstract:
A process for producing a structure of a ball-grid array (BGA) package substrate, comprising the steps of:providing a substrate, wherein two sides of said substrate are respectively covered with one layer of a release film; forming a plurality of via holes and a cavity in said substrate, wherein said via holes are located in predetermined positions of solder balls for ground of said substrate, and said cavity is located for receiving a chip; plugging conductive paste in said via holes of said substrate; removing said release films; laminating a heat sink layer and a copper foil respectively on said two sides of said substrate; patterning said copper foil to form a pattern layer having patterns for connecting said solder balls and conductive traces of said substrate; coating black ink on said heat sink layer; forming a layer of black oxide onto the surface of said heat sink layer within said cavity; coating a solder mask on said pattern layer; performing a photolithography procedure to bare portions of said pattern layer where said solder balls are connected; performing an electroplating process to plate in turn a Ni film and an Au film on said uncovered portions of said pattern layer; mounting said solder balls onto said Au film of said pattern layer; and setting said chip onto said layer of black oxide, and connecting bonding pads of said chip with said patterns for connecting said solder balls as well as said conductive traces of said substrate by wire bonding.