# US 2021/0241969 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 2021/0241969 A1 - Document ID: US20210241969A1 - Status: Published application - Kind: A1 - Application number: 17/165,621 - 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/US20210241969A1 ## 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, a second coil, a first terminal electrode, a second terminal electrode, a third terminal electrode, and a fourth terminal electrode. The multilayer body includes plural non-conductor layers. The first and second coils are incorporated in the multilayer body. The first and second terminal electrodes are connected to the first coil. The third and fourth terminal electrodes are connected to the second coil. The first coil has a path length L1, the second coil has a path length L2, and the sum of the path length L1 and the path length L2 is less than or equal to 3.5 mm. ## 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; 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 having a path length L1, the second coil having a path length L2, and a sum of the path length L1 and the path length L2 being less than or equal to 3.5 mm; 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, and the second terminal electrode being electrically connected to a 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 a fourth end. ### Claim 2 (depends on 1) The common-mode choke coil according to claim 1, wherein the sum of the path length L1 and the path length L2 is less than or equal to 3.3 mm. ### Claim 3 (depends on 1) The common-mode choke coil according to claim 1, wherein a difference between the path length L1 and the path length L2 has an absolute value of less than or equal to 0.4 mm. ### Claim 4 (depends on 1) The common-mode choke coil according to claim 1, wherein each of the path length L1 and the path length L2 is less than or equal to 2.0 mm. ### Claim 5 (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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 6 (depends on 5) The common-mode choke coil according to claim 5, wherein the first terminal electrode and the third terminal electrode are provided on the first lateral face, and the second terminal electrode and the fourth terminal electrode are provided on the second lateral face. ### Claim 7 (depends on 2) The common-mode choke coil according to claim 2, wherein a difference between the path length L1 and the path length L2 has an absolute value of less than or equal to 0.4 mm. ### Claim 8 (depends on 2) The common-mode choke coil according to claim 2, wherein each of the path length L1 and the path length L2 is less than or equal to 2.0 mm. ### Claim 9 (depends on 3) The common-mode choke coil according to claim 3, wherein each of the path length L1 and the path length L2 is less than or equal to 2.0 mm. ### Claim 10 (depends on 7) The common-mode choke coil according to claim 7, wherein each of the path length L1 and the path length L2 is less than or equal to 2.0 mm. ### Claim 11 (depends on 2) The common-mode choke coil according to claim 2, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 12 (depends on 3) The common-mode choke coil according to claim 3, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 13 (depends on 4) The common-mode choke coil according to claim 4, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 14 (depends on 7) The common-mode choke coil according to claim 7, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 15 (depends on 8) The common-mode choke coil according to claim 8, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 16 (depends on 9) The common-mode choke coil according to claim 9, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 17 (depends on 10) The common-mode choke coil according to claim 10, 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 the multilayer body has a length dimension of from 0.55 mm to 0.75 mm, the length dimension being a dimension between the first end face and the second end face that are opposite to each other, wherein the multilayer body has a width dimension of from 0.40 mm to 0.60 mm, the width dimension being a dimension between the first lateral face and the second lateral face that are opposite to each other, and wherein the multilayer body has a height dimension of from 0.20 mm to 0.40 mm, the height dimension being a dimension between the first major face and the second major face that are opposite to each other. ### Claim 18 (depends on 11) The common-mode choke coil according to claim 11, wherein the first terminal electrode and the third terminal electrode are provided on the first lateral face, and the second terminal electrode and the fourth terminal electrode are provided on the second lateral face. ### Claim 19 (depends on 12) The common-mode choke coil according to claim 12, wherein the first terminal electrode and the third terminal electrode are provided on the first lateral face, and the second terminal electrode and the fourth terminal electrode are provided on the second lateral face. ### Claim 20 (depends on 13) The common-mode choke coil according to claim 13, wherein the first terminal electrode and the third terminal electrode are provided on the first lateral face, and the second terminal electrode and the fourth terminal electrode are provided on the second lateral face.