Patent ID: 6380062
Filing Date: 2002-04-30
Classification: H01L,Y10T

Abstract:
A method for forming a ball grid array package, comprising the steps of:providing a metal substrate having a first and a second surface; forming an electroplated die pad layer and a plurality of first electroplated layer over the first surface of the metal substrate such that the first electroplated layers are positioned around the central electroplated die pad layer; forming a plurality of second electroplated layers over the second surface of the metal substrate; performing a patterning operation to remove a layer of substrate material from the first surface to form a die pad under the electroplated die pad layer, a plurality of first metal pegs under the first electroplated layers, and a plurality of trace lines in the metal substrate; performing an etching operation to reduce thickness of the trace lines so that a top surface of the trace line is at a height lower than a top surface of the first metal peg; attaching a die onto the electroplated die pad layer; forming electrical connections between the die and the first electroplated layers; enclosing the die, the electroplated die pad layer, the die pad, the trace lines, the first electroplated layer and the first metal pegs on the first surface of the metal substrate using an insulation material; etching the second surface of the metal substrate to form a plurality of second metal pegs using the second electroplated layers as an etching mask so that a portion of the trace lines is exposed; and forming a soldering mask over the second surface of the metal substrate such that the second electroplated layers are exposed.