Patent ID: 6457633
Filing Date: 2002-10-01
Classification: H01L,H05K

Abstract:
A method of forming a semiconductor device by mounting solder balls on a resin board which has holes formed therethrough and conductive sheets formed therebeneath to cover bottom ends of the holes, said method comprising the steps of:a) applying a singular amount of solder paste in excess of a volume of each of the holes directly on the holes using a mask having mask holes, each of said mask holes having a volume corresponding to said singular amount; and b) melting the solder paste by heat to make solder of the solder paste flow into the holes and establish contact with the conductive sheets and to make the solder of the solder paste in excess of the volume of each of the holes form the solder balls projecting from the resin board, wherein said step b) is performed with respect to the holes having an inside wall that is an exposed resin surface of the resin board.