Patent ID: 6376912
Filing Date: 2002-04-23
Classification: H01L,H03H

Abstract:
A common mode choke coil comprising:an insulator substrate; a layered member composed of a plurality of insulator resin layers and a plurality of conductor pattern layers alternately stacked on said insulator substrate to form a first conductor line and a second conductor line, each of which comprises at least one conductor layer, said layered member stacked on said substrate having side surfaces on which first, second, third and fourth areas are defined, respectively, said first and second conductor lines having magnetic and electrocapacitive coupling with each other; first and second external electrode terminal portions connected to opposite ends of said first conductor line and covering first and second areas of side surfaces of said layered member and said insulator substrate, respectively; a third external electrode terminal portion connected to one end of said second conductor line and covering a third area of the side surface of said layered member and said insulator substrate; a fourth external electrode terminal connected to the other end of said second conductor line and formed on the side surfaces of said layered member and said insulator substrate at said fourth area different from said first through said third external electrode terminal portions; said first and said second conductor lines having spiral patterns on different conductor layers, the number of turns in both lines being equal to each other and each forming at least one spiral turn; a pair of said first and said third external electrode terminals and another pair of said second and said fourth external electrode terminals serving as an input terminal pair and an output terminal pair, respectively; and first through fourth electrode extracting structures including said first through said fourth electrode terminal portions, each of said first through fourth electrode extracting structures comprising: the uppermost one of said insulator resin layers of said common mode choke coil provided with an electrode extracting portion formed as a notch or a through hole penetrating said uppermost insulator resin layer to reach an underlying one of said conductor pattern layers; and an electrode extracting pattern filled in said electrode extracting portion, said electrode extracting pattern being connected to a corresponding one of said first, said second, said third and said fourth external electrode terminal portions.