Laminated common-mode choke coil

摘要

A laminated common-mode choke coil is disclosed in which the coupling characteristics of first and second coil electrodes are improved so as to reduce normal mode impedance. A first coil electrode and a second coil electrode are laminated across an insulating layer. The first coil electrode is formed in a spiral shape in an area from a first external electrode to a first through-hole electrode (point L). A second coil electrode is formed in a spiral shape in an area from a third external electrode to a second through-hole electrode (point K). Both coil electrodes are spirally overlapped with each other in an area from point B to point K. Three coil embodiments are also disclosed.