Patent ID: 6573610
Filing Date: 2003-06-03
Classification: H01L,H05K,Y02P

Abstract:
A substrate of semiconductor package for Flip Chip package comprising:at least an insulative core layer and a plurality of patterned circuit layers alternately stacking up each other, and the patterned circuit layers are electrically connected each other, wherein a topmost one of the patterned circuit layers is positioned on a first surface of a topmost insulative core layer, the topmost patterned circuit layer includes a plurality of bump pads, each of the bump pads has an etching hole, each of the bump pads has an upper surface, an outer sidewall surface and an inner sidewall surface inside the etching hole, and the etching hole exposes the first surface of the topmost insulative core layer; and a solder mask layer covering the surface of the patterned circuit layer, the outer sidewall surface of the upper surface of the bump pads, but exposing the inner sidewall surface inside the etching holes and a portion of the upper surface of the bump pads.