Patent ID: 8101866

Claim:
A packaging substrate with conductive structure, comprising: a packaging substrate body having at least one conductive pad on a surface thereof; a stress buffer metal layer disposed on the conductive pad for releasing thermal stresses by the stress buffer metal layer during reflow processes, wherein the stress buffer metal layer is made of one selected from the group consisting of tin (Sn), lead (Pb), copper (Cu), silver (Ag), bismuth (Bi), zinc (Zn), indium (In), and an alloy of a combination of the above-mentioned; a solder resist layer disposed on the packaging substrate body and having at least one opening therein corresponding in position to the stress buffer metal layer, with a size of the opening smaller than that of the stress buffer metal layer; a metal post disposed on a central portion of the stress buffer metal layer for releasing thermal stresses by the metal post and the stress buffer metal layer during end use; and a solder bump at least partially covering the metal post.