Patent ID: 6734601
Filing Date: 2004-05-11
Classification: H01L,H03H

Abstract:
A surface acoustic wave device comprising:a surface acoustic wave element including a piezoelectric substrate having interdigital electrodes and electrode pads thereon, the electrode pads being arranged to input and output electrical signals to and from the respective interdigital electrodes; an electronic component package supporting the surface acoustic wave element, the electronic component package including electrode pattern sections arranged to input and output electrical signals; metal bump connections electrically connecting the electrode pads to the respective electrode pattern sections; and intermediate electrodes and upper electrodes on the respective electrode pads; wherein the electrode pads include aluminum as a major component and copper as a minor component, the cooper content being at least about 3.5 percent by weight; and the intermediate electrodes are disposed between the respective electrode pads and the respective upper electrodes and include a material for enhancing the bonding strength therebetween, and the upper electrodes include a material for enhancing the bonding strength between the respective intermediate electrodes and the respective metal bump connections.