# US 2021/0241970 A1 · Common-mode choke coil > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0241970 A1 - Document ID: US20210241970A1 - Status: Published application - Kind: A1 - Application number: 17/165,733 - Filed: 2021-02-02 - Published: 2021-08-05 - Earliest claimed: 2020-02-04 - Assignees: Murata Manufacturing Co., Ltd. - Applicants: Murata Manufacturing Co., Ltd. - Inventors: Kouhei MATSUURA; Atsuo HIRUKAWA; Hiroshi UEKI - Web page: https://patentgrep.com/patent/US20210241970A1 ## CPC - H01F 27/292: {Surface mounted devices} - H01F 17/0013: {with stacked layers} - H01F 19/04: Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range (resonant circuits H03H) - H01F 38/48: {Common mode inductor for reducing or eliminating common mode noise on parallel lines} - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A common-mode choke coil includes a multilayer body, a first coil, and a second coil. The multilayer body includes plural stacked non-conductor layers. The first and second coils are incorporated in the multilayer body. The first coil includes a first coil conductor. The second coil includes a second coil conductor disposed along an interface between non-conductor layers different from an interface between non-conductor layers along which the first coil conductor is disposed. With the first coil conductor and the second coil conductor being viewed in plan in the stacking direction of the multilayer body, the first coil conductor and the second coil conductor have no portion where the two coil conductors overlap each other, except for a portion where the two coil conductors cross each other. ## Claims ### Claim 1 A common-mode choke coil comprising: a multilayer body including a plurality of non-conductor layers, the plurality of non-conductor layers being stacked and each made of a non-conductor, and the plurality of non-conductor layers including a first plurality of non-conductor layers and a second plurality of non-conductor layers; a first coil and a second coil that are incorporated in the multilayer body, the first coil having a first end and a second end which are different ends of the first coil, the second coil having a third end and a fourth end which are different ends of the second coil, the first coil including a first coil conductor disposed along a first interface which is an interface between the first plurality of non-conductor layers, and the second coil including a second coil conductor disposed along a second interface which is an interface between the second plurality of non-conductor layers and different from the first interface along which the first coil conductor is disposed; a first terminal electrode and a second terminal electrode that are provided on an outer surface of the multilayer body, the first terminal electrode being electrically connected to the first end, the second terminal electrode being electrically connected to the second end; and a third terminal electrode and a fourth terminal electrode that are provided on an outer surface of the multilayer body, the third terminal electrode being electrically connected to the third end, and the fourth terminal electrode being electrically connected to the fourth end, wherein with the first coil conductor and the second coil conductor being viewed in plan in a stacking direction of the multilayer body, the first coil conductor and the second coil conductor have no portion where the first coil conductor and the second coil conductor overlap each other, except for a portion where the first coil conductor and the second coil conductors cross each other. ### Claim 2 (depends on 1) The common-mode choke coil according to claim 1, wherein the multilayer body is a cuboid in shape, the cuboid having a first major face and a second major face that extend in a direction in which the plurality of non-conductor layers extend, the first major face and the second major face being opposite to each other, a first lateral face and a second lateral face that couple the first major face and the second major face to each other, the first lateral face and the second lateral face being opposite to each other, and a first end face and a second end face that couple the first major face and the second major face to each other and couple the first lateral face and the second lateral face to each other, the first end face and the second end face being opposite to each other, wherein a distance from the first lateral face to the first coil conductor, and a distance from the first lateral face to the second coil conductor differ from each other with a difference greater than a line width of one of the first and second coil conductors that is closer to the first lateral face, wherein a distance from the second lateral face to the first coil conductor, and a distance from the second lateral face to the second coil conductor differ from each other with a difference greater than a line width of one of the first and second coil conductors that is closer to the second lateral face, wherein a distance from the first end face to the first coil conductor, and a distance from the first end face to the second coil conductor differ from each other with a difference greater than a line width of one of the first and second coil conductors that is closer to the first end face, and wherein a distance from the second end face to the first coil conductor, and a distance from the second end face to the second coil conductor differ from each other with a difference greater than a line width of one of the first and second coil conductors that is closer to the second end face. ### Claim 3 (depends on 1) The common-mode choke coil according to claim 1, wherein with the first coil conductor and the second coil conductor being viewed in plan in the stacking direction of the multilayer body, the first coil conductor and the second coil conductor cross each other at two or less locations. ### Claim 4 (depends on 1) The common-mode choke coil according to claim 1, wherein the first coil conductor and the second coil conductor each have a number of turns of less than 2. ### Claim 5 (depends on 2) The common-mode choke coil according to claim 2, wherein with the first coil conductor and the second coil conductor being viewed in plan in the stacking direction of the multilayer body, the first coil conductor and the second coil conductor cross each other at two or less locations. ### Claim 6 (depends on 2) The common-mode choke coil according to claim 2, wherein the first coil conductor and the second coil conductor each have a number of turns of less than 2. ### Claim 7 (depends on 3) The common-mode choke coil according to claim 3, wherein the first coil conductor and the second coil conductor each have a number of turns of less than 2. ### Claim 8 (depends on 5) The common-mode choke coil according to claim 5, wherein the first coil conductor and the second coil conductor each have a number of turns of less than 2.