Patent ID: 7173828

Claim:
A ground pad structure for preventing solder extrusion in a semiconductor package, the semiconductor package having a substrate comprising a dielectric layer and a solder mask layer on the dielectric layer, the solder mask layer having a plurality of openings, the ground pad structure comprising: a ground plane, which is made of a conductive material and provided on the dielectric layer and covered by the solder mask layer of the substrate; and a plurality of ground pads formed on the ground plane and exposed from the openings of the solder mask layer; wherein a part of the ground pads, which are located on the circumference of the ground plane, are non-solder mask defined ground pads protruding from and partially extending from the circumference of the ground plane, such that a portion of the dielectric layer surrounding the non-solder mask defined ground pads is exposed from the solder mask layer.