Patent ID: 7291904

Claim:
A package substrate comprising: signal pads provided on a main surface of the package substrate; footpads provided on a backside of the package substrate; a sealing electrode provided on the main surface to surround the signal pads, the sealing electrode forming a hermetical seal in touch with a corresponding sealing electrode of a device to be packaged in an assembled state, wherein the signal pads are electrically coupled to the footpads, and the sealing electrode is insulated from the footpads; and a plurality of extraction electrodes including at least a first extraction electrode and a second extraction electrode, wherein: the package substrate comprises a plurality of sets of the signal pads, the footpads, and the sealing electrodes, said plurality of sets being respectively provided in a plurality of regions arranged adjacently to each other, the plurality of extraction electrodes being arranged in a circumferential region of the main surface to surround said plurality of sets, the first extraction electrode electrically coupled to the signal pads and the second extraction electrode electrically coupled to the sealing electrode, the signal pads and the sealing electrodes being separately plated through the first and second extraction electrodes which are insulated from each other, respectively.