Patent ID: 7719387

Claim:
A multilayer filter comprising: an inductor section with an inductor conductor portion being formed in an inductor layer; and a varistor section with a varistor conductor portion being formed in a varistor layer, said inductor section and said varistor section being arranged so as to form an interface; wherein the varistor layer contains ZnO as a major ingredient and additives of at least one element selected from the group consisting of Pr and Bi, Co, and Al; wherein the inductor layer contains ZnO as a major ingredient and contains no substantial amount of Co and Al; wherein a diffusion layer is formed on an interface side in the inductor layer and contains Li; wherein a separation distance between the inductor conductor portion and the interface is 21 μm or more; wherein the varistor conductor portion is located 40 μm or more away from the interface; and wherein said Li is diffused from a surface into the diffusion layer of the inductor layer through a clearance formed around a lead conductor portion of the inductor conductor portion to the surface, the lead conductor portion having a thickness of not less than 3 μm.