Patent ID: 8587389

Claim:
An electronic device, comprising: a piezoelectric substrate; and a mounting substrate on which the piezoelectric substrate is mounted, wherein the piezoelectric substrate comprises, on a main surface which is a surface mounted on the mounting substrate, a piezoelectric substrate side electrode group comprising a first electrode, a second electrode, and a third electrode, the mounting substrate comprises, on a first main surface facing the main surface of the piezoelectric substrate, a first mounting substrate side electrode group comprising, a plurality of electrode pads connected to the first electrode, the second electrode, and the third electrode, respectively, and a dummy electrode pad connected to none of the first electrode, the second electrode, and the third electrode; and, on a second main surface which is on the back of the first main surface, a second mounting substrate side electrode group comprising a plurality of terminal electrodes electrically connected to the first mounting substrate side electrode group and connected to circuit interconnects of an external circuit board, the first mounting substrate side electrode group and the second mounting substrate side electrode group are each arranged line-symmetrically with respect to a virtual line on the first main surface in a plan view, and the piezoelectric substrate side electrode group is arranged asymmetrically with respect to the virtual line.