Patent ID: 6815869
Filing Date: 2004-11-09
Classification: H01L,H03H

Abstract:
A surface acoustic wave device comprising:a surface acoustic wave element having first and second main surfaces facing each other and a plurality of end surfaces connecting the first and second main surfaces, and having an electrode and a bump pad for electrical connection to an exterior on the first main surface; a substrate having an electrode land joined with the bump pad of the surface acoustic wave element via a bump; and a resin sealing layer arranged so as to cover said surface acoustic wave element such that said surface acoustic wave element is joined with an upper surface of said substrate from the first main surface side via the bump, and said surface acoustic wave element is spaced from said upper surface of the substrate; wherein said substrate includes a multi-layered substrate including an upper surface, a lower surface and two side surface connecting the upper surface and the lower surface; said multi-layer substrate includes a via hole electrode in which one end thereof is connected to said electrode land provide on the upper surface of the multi-layer substrate, said via hole electrode does not extend to the lower surface of the multi-layer substrate; an internal electrode provided inside of said multi-layered substrate and connected to said via hole electrode; a mounting electrode provided on the lower surface of said multi-layered substrate; and an end surface wiring electrode extends along atleast one of the two side surfaces of the multi-layered substrate and is connected to said mounting electrode and said internal electrode at said at least one of the two side surfaces of the multi-layer substrate.