Patent ID: 7033917
Filing Date: 2006-04-25
Classification: H01L,H05K,Y10T

Abstract:
1. A fabrication method of a packaging substrate comprising the steps of: forming a first conductive pattern on an upper surface of a substrate and forming a second conductive pattern on a bottom surface of the substrate, wherein the second conductive pattern is electrically connected to the first conductive pattern; forming a first solder mask on the upper surface of the substrate to define first connecting positions on the first conductive pattern and forming a second solder mask on the bottom surface to define second connecting positions on the second conductive pattern; forming a seed layer on the bottom surface of the substrate, the seed layer is electrically connected to the second conductive pattern; forming a passivation layer on a surface of the seed layer; and connecting a cathode to the seed layer for plating metal pads covering the exposed first conductive pattern.