Patent ID: 6781234
Filing Date: 2004-08-24
Classification: H01L,H05K

Abstract:
A semiconductor device comprising a wiring substrate having a principal surface and a surface opposite thereto, a plurality of first electrodes formed over the opposite surface of said wiring substrate, a plurality of protruding electrodes formed over said plurality of electrodes, respectively, and a semiconductor chip disposed over the principal surface of said wiring substrate and electrically connected to said plurality of protruding electrodes via said first plurality of electrodes,wherein each of said plurality of first electrodes has a first conductor film containing Cu and a second conductor film formed between said first conductor film and each of said protruding electrodes and containing Ni and P, wherein each of said plurality of protruding electrodes is made of a solder containing Sn and any one of Ba, Be, Ca and Mg, wherein said semiconductor chip has, over the principal surface thereof, a plurality of semiconductor elements and a plurality of electrodes, and wherein said plurality of electrodes of said semiconductor chip are electrically connected to said plurality of protruding electrodes via said plurality of first electrodes.