Laminated coil component

Abstract

To provide a laminated coil component which is capable of responding to a heavy current with low inductance and has a small mounting area.SOLUTION: A laminated coil component 1 comprises: an element assembly 10 which is configured by laminating a plurality of magnetic layers 11 each consisting of metal magnetic particles; a first coil 21 including a first end 30a and a second end 30b consisting of a first conductor layer 51 inside of the element assembly; a second coil 22 which includes a third end 30c and a fourth end 30d consisting of a second conductor layer 52 and is disposed closer to a bottom face of the element assembly than the first coil; a first external electrode 31 and a second external electrode 32 on the bottom face of the element assembly connected to the first end and the second end of the first coil; a third external electrode 33 and a fourth external electrode 34 on the bottom face of the element assembly connected to the third end and the fourth end of the second coil; a first via conductor 41 connecting the first end of the first coil with the first external electrode; a second via conductor 42 connecting the second end of the first coil with the second external electrode; a third via conductor 43 connecting the third end of the second coil with the third external electrode; and a fourth via conductor 44 connecting the fourth end of the second coil with the fourth external electrode.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a multilayer coil component.

Background Art

[0002] Patent Document 1 discloses a coil component including a magnetic support layer having a first main surface and a second main surface located on the opposite side of the first main surface, a first coil pattern disposed on the first main surface of the magnetic support layer, a second coil pattern disposed on the second main surface of the magnetic support layer, a first magnetic resin layer provided on the first main surface of the magnetic support layer and embedding the first coil pattern, a second magnetic resin layer provided on the second main surface of the magnetic support layer and embedding the second coil pattern, first and second terminal electrodes exposed from the first magnetic resin layer and connected to one end and the other end of the first coil pattern respectively, and third and fourth terminal electrodes exposed from the second magnetic resin layer and connected to one end and the other end of the second coil pattern respectively, wherein the magnetic support layer has a higher magnetic permeability than the first and second magnetic resin layers.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] According to Patent Document 1, since the first coil pattern and the second coil pattern are disposed on the front and back of the magnetic support layer, it is possible to reduce the chip size. Further, Patent Document 1 describes an embodiment in which the number of turns of the first coil pattern and the second coil pattern is about 1 turn respectively.

[0005] However, an inductor that can handle a large current with low inductance and has a small mounting area is desired.

[0006] The present invention has been made to solve the above problems, and an object thereof is to provide a multilayer coil component that can handle a large current with low inductance and has a small mounting area.

Means for Solving the Problems

[0007] The multilayer coil component of the present invention includes a body formed by laminating a plurality of magnetic layers made of metal magnetic particles, a first coil disposed inside the body and composed of a first conductor layer, having a first end and a second end, a second coil disposed inside the body and composed of a second conductor layer, having a third end and a fourth end, and located on the bottom surface side of the body relative to the first coil in the stacking direction of the magnetic layers, a first external electrode provided on the bottom surface of the body and connected to the first end of the first coil, a second external electrode provided on the bottom surface of the body and connected to the second end of the first coil, a third external electrode provided on the bottom surface of the body and connected to the third end of the second coil, a fourth external electrode provided on the bottom surface of the body and connected to the fourth end of the second coil, a first via conductor provided inside the body and connecting the first end of the first coil and the first external electrode, a second via conductor provided inside the body and connecting the second end of the first coil and the second external electrode, a third via conductor provided inside the body and connecting the third end of the second coil and the third external electrode, and a fourth via conductor provided inside the body and connecting the fourth end of the second coil and the fourth external electrode.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a multilayer coil component that can handle a large current with low inductance and has a small mounting area.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

[0010] Hereinafter, the multilayer coil component of the present invention will be described. However, the present invention is not limited to the following embodiments, and can be appropriately modified and applied without changing the gist of the present invention. Combinations of two or more of the individual desirable configurations of the present invention described in the following embodiments are also within the scope of the present invention.

[0011] The multilayer coil component of the present invention is used, for example, as a choke coil of a DC-DC converter. The multilayer coil component of the present invention can also be applied to uses other than the choke coil of a DC-DC converter.

[0012] Each of the embodiments described below is an example, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. In the following embodiments from the second embodiment onwards, descriptions of matters common to the first embodiment are omitted, and only differences will be explained. In particular, for similar operational effects due to similar configurations, they will not be sequentially mentioned for each embodiment.

[0013] In the following description, when not particularly distinguishing each embodiment, it is simply referred to as "the laminated coil component of the present invention".

[0014] In this specification, terms indicating the relationship between elements (such as "vertical", "parallel", "orthogonal", etc.) and terms indicating the shape of elements are not expressions representing only strict meanings, but are expressions meaning that they include substantially equivalent ranges, for example, differences of about several percent. Also, in this specification, "the same" and "equivalent" are not expressions meaning only completely equivalent cases, but are expressions meaning substantially equivalent cases, for example, including differences of about several percent.

[0015] The drawings shown below are schematic diagrams, and their dimensions, scales of aspect ratios, etc. may be different from those of actual products. In the figures, the same or corresponding parts shall be denoted by the same reference numerals. Also, in each figure, the same elements are denoted by the same reference numerals and redundant descriptions are omitted.

[0016] [First Embodiment] In the laminated coil component according to the first embodiment of the present invention, a first coil and a second coil are arranged inside the element body.

[0017] FIG. 1 is a perspective view schematically showing an example of the internal structure of the laminated coil component according to the first embodiment of the present invention. Note that the shapes and arrangements of the laminated coil component and each component are not limited to the illustrated examples.

[0018] The multilayer coil component 1 shown in FIG. 1 includes a base body 10, a first coil 21, a second coil 22, a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first via conductor 41, a second via conductor 42, a third via conductor 43, and a fourth via conductor 44.

[0019] In FIG. 1, the length direction, width direction, and height direction of the multilayer coil component 1 and the base body 10 are shown as the L direction, W direction, and T direction, respectively. The length direction L, width direction W, and height direction T are orthogonal to each other. The mounting surface of the multilayer coil component 1 is, for example, a surface (LW surface) parallel to the length direction L and the width direction W.

[0020] FIG. 2 is a perspective view schematically showing the appearance of the multilayer coil component shown in FIG. 1.

[0021] The base body 10 is, for example, a rectangular parallelepiped shape or a substantially rectangular parallelepiped shape having six faces. The corners and edges of the base body 10 may be rounded. A corner is a portion where three faces of the base body 10 intersect, and an edge is a portion where two faces of the base body 10 intersect.

[0022] As shown in FIG. 2, the base body 10 has, for example, a first main surface 10a and a second main surface 10b that face each other in the height direction T, a first side surface 10c and a second side surface 10d that face each other in the length direction L orthogonal to the height direction T, and a third side surface 10e and a fourth side surface 10f that face each other in the width direction W orthogonal to the length direction L and the height direction T. In the example shown in FIG. 2, the first main surface 10a of the base body 10 corresponds to the bottom surface of the base body 10.

[0023] FIG. 3 is an exploded perspective view of the multilayer coil component shown in FIG. 1.

[0024] The base body 10 is composed of a plurality of magnetic layers 11 laminated. In the example shown in FIG. 3, the lamination direction of the magnetic layers 11 is the height direction T. Note that in the multilayer coil component 1, the boundaries of the respective layers of the magnetic layer 11 included in the base body 10 may not appear clearly.

[0025] When the base body 10 has a laminated structure of the magnetic layer 11, the degree of freedom in the design of the laminated coil component 1 increases. For example, when manufacturing the laminated coil component 1 provided with the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 on the bottom surface (the first main surface 10a) of the base body 10, it becomes easier to draw out the first coil 21 and the second coil 22 to the bottom surface side.

[0026] The magnetic layer 11 is composed of metal magnetic particles. Examples of the metal magnetic particles include Fe, Co, Ni, or alloys containing at least one of these. The metal magnetic particles are preferably Fe particles or Fe alloy particles. Preferred Fe alloys include Fe-Si based alloys, Fe-Si-Cr based alloys, Fe-Si-Al based alloys, Fe-Si-B-P-Cu-C based alloys, Fe-Si-B-Nb-Cu based alloys, etc.

[0027] The surface of the metal magnetic particles is preferably covered with an insulating film. When the surface of the metal magnetic particles is covered with an insulating film, the insulation between the metal magnetic particles can be enhanced. As a method for forming an insulating film on the surface of the metal magnetic particles, methods such as the sol-gel method and the mechanochemical method can be used. Materials constituting the insulating film are preferably oxides such as P and Si. Also, the insulating film may be an oxide film formed by oxidizing the surface of the metal magnetic particles. The thickness of the insulating film is preferably 1 nm or more and 50 nm or less, more preferably 1 nm or more and 30 nm or less, and even more preferably 1 nm or more and 20 nm or less. For example, a cross-section obtained by polishing a sample of the laminated coil component is photographed with a scanning electron microscope (SEM), and the thickness of the insulating film covering the surface of the metal magnetic particles can be measured from the obtained SEM photograph.

[0028] The average particle diameter of the metal magnetic particles in the magnetic layer 11 is preferably 1 μm or more and 30 μm or less, more preferably 1 μm or more and 20 μm or less, and even more preferably 1 μm or more and 10 μm or less. The average particle diameter of the metal magnetic particles in the magnetic layer 11 can be measured by the procedure described below. For the cross section obtained by cutting the sample of the laminated coil component, a plurality of regions (for example, 5 regions) (for example, 130 μm × 100 μm) are photographed with SEM, and the obtained SEM photograph is analyzed using image analysis software (for example, WinROOF 2018 (Miyaya Corporation)) to obtain the equivalent circle diameter of the metal magnetic particles. The average value of the obtained equivalent circle diameters is taken as the average particle diameter of the metal magnetic particles.

[0029] As shown in FIG. 1, a first coil 21 and a second coil 22 are arranged inside the base body 10. The first coil 21 and the second coil 22 are preferably magnetically coupled.

[0030] The first coil 21 is composed of a first conductor layer 51 and has a first end 30a and a second end 30b.

[0031] The number of turns of the first coil 21 is preferably less than 1 turn. The first coil 21 is preferably composed of a single layer of conductor layer.

[0032] The second coil 22 is located on the bottom surface side (the first main surface 10a side) of the base body 10 rather than the first coil 21 in the stacking direction (for example, the height direction T) of the magnetic layer 11.

[0033] The second coil 22 is composed of a second conductor layer 52 and has a third end 30c and a fourth end 30d. The thickness of the second conductor layer 52 is preferably equal to the thickness of the first conductor layer 51.

[0034] The number of turns of the second coil 22 is preferably less than 1 turn. The second coil 22 is preferably composed of a single layer of conductor layer. The number of turns of the second coil 22 may be the same as or different from the number of turns of the first coil 21.

[0035] In a plan view from the stacking direction (for example, the height direction T), the first coil 21 preferably has a U-shaped configuration having three sides.

[0036] In a plan view from the stacking direction (for example, the height direction T), the second coil 22 preferably has a shape in which two corners of a U-shaped configuration having three sides are chamfered. Note that the middle one of the three sides may disappear due to chamfering.

[0037] Specifically, the second coil 22 preferably includes an avoidance portion 55 (see FIG. 3) at the corner. The avoidance portion 55 of the second coil 22 is preferably disposed inside the first via conductor 41 and inside the second via conductor 42 in a plan view from the stacking direction (for example, the height direction T) in order to avoid the first via conductor 41 and the second via conductor 42. The shape of the avoidance portion 55 is not particularly limited, and may be linear or curved. Further, the avoidance portion 55 may be constituted by two or more line segments.

[0038] The first external electrode 31 and the second external electrode 32 are provided on the bottom surface (the first main surface 10a) of the element body 10 and are electrically connected to the first coil 21. Specifically, the first external electrode 31 is connected to the first end 30a of the first coil 21, and the second external electrode 32 is connected to the second end 30b of the first coil 21.

[0039] The third external electrode 33 and the fourth external electrode 34 are provided on the bottom surface (the first main surface 10a) of the element body 10 and are electrically connected to the second coil 22. Specifically, the third external electrode 33 is connected to the third end 30c of the second coil 22, and the fourth external electrode 34 is connected to the fourth end 30d of the second coil 22.

[0040] The first external electrode 31 and the second external electrode 32, and the third external electrode 33 and the fourth external electrode 34 are disposed at positions facing each other, and preferably, a straight line connecting the first external electrode 31 and the third external electrode 33 and a straight line connecting the second external electrode 32 and the fourth external electrode 34 do not intersect.

[0041] The first external electrode 31 may be provided only on the first main surface 10a of the element body 10, or may be provided so as to straddle the first main surface 10a of the element body 10 and at least one of the first side surface 10c and the third side surface 10e.

[0042] The second external electrode 32 may be provided only on the first main surface 10a of the element body 10, or may be provided so as to straddle the first main surface 10a of the element body 10 and at least one of the second side surface 10d and the third side surface 10e.

[0043] The third external electrode 33 may be provided only on the first main surface 10a of the element body 10, or may be provided so as to straddle the first main surface 10a of the element body 10 and at least one of the first side surface 10c and the fourth side surface 10f.

[0044] The fourth external electrode 34 may be provided only on the first main surface 10a of the element body 10, or may be provided so as to straddle the first main surface 10a of the element body 10 and at least one of the second side surface 10d and the fourth side surface 10f.

[0045] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 may each be made of a conductive material such as Ag. For example, the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 each include a base electrode layer containing Ag and one or more plating layers provided on the base electrode layer. The plating layer preferably includes a Cu plating layer provided on the base electrode layer, or includes a Ni plating layer provided on the base electrode layer and further includes a Sn plating layer provided on the Ni plating layer.

[0046] The thickness of the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 is preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less for each. The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 are preferably equal to each other.

[0047] The thickness of the external electrodes such as the first external electrode 31 can be measured by the procedure described below. The sample is polished in the same manner as the method described above, and the portion of the external electrode is photographed with an SEM. In the obtained SEM photograph, one point at approximately the center of the external electrode is measured and defined as the thickness of the external electrode.

[0048] The first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 are provided inside the base body 10.

[0049] The first via conductor 41 connects the first end 30a of the first coil 21 and the first external electrode 31. The first via conductor 41 preferably extends along the stacking direction (for example, the height direction T). The first via conductor 41 may have a stacked structure.

[0050] The second via conductor 42 connects the second end 30b of the first coil 21 and the second external electrode 32. The second via conductor 42 preferably extends along the stacking direction (for example, the height direction T). The second via conductor 42 may have a stacked structure.

[0051] The third via conductor 43 connects the third end 30c of the second coil 22 and the third external electrode 33. The third via conductor 43 preferably extends along the stacking direction (for example, the height direction T). The third via conductor 43 may have a stacked structure.

[0052] The fourth via conductor 44 connects the fourth end 30d of the second coil 22 and the fourth external electrode 34. The fourth via conductor 44 preferably extends along the stacking direction (for example, the height direction T). The fourth via conductor 44 may have a stacked structure.

[0053] In the multilayer coil component 1, the bottom surface (the first main surface 10a) of the base body 10 can be used as the mounting surface. That is, since mounting can be performed on the bottom surface of the multilayer coil component 1, the mounting area can be reduced.

[0054] In the multilayer coil component 1, the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the first via conductor 41, the second via conductor 42, the third via conductor 43, the fourth via conductor 44, the first conductor layer 51, and the second conductor layer 52 may each be formed by printing a plurality of substantially identical conductor patterns.

[0055] The shape perpendicular to the stacking direction of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 is not particularly limited, and examples include polygons such as quadrilaterals, circles, ellipses, and sectors. In the example shown in FIG. 3, the shape perpendicular to the stacking direction of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 is a sector. Among these, by making the first via conductor 41 and the second via conductor 42 located at the corner portions of the magnetic layer 11 constituting the element body 10 into sectors, the avoidance portion 55 can be made smaller and the inner diameter of the second coil 22 can be increased. On the other hand, the third via conductor 43 and the fourth via conductor 44 may be sectors or may have shapes other than sectors.

[0056] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 preferably have areas larger than those of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 when viewed from the stacking direction so as to have the same shape.

[0057] Among the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44, at least the third via conductor 43 and the fourth via conductor 44 are preferably not exposed on the side surface of the element body 10. On the other hand, the first via conductor 41 and the second via conductor 42 may not be exposed on the side surface of the element body 10 or may be exposed on at least one side surface of the element body 10. By exposing the first via conductor 41 and the second via conductor 42, the avoidance portion 55 can be made smaller and the inner diameter of the second coil 22 can be increased.

[0058] [Second Embodiment] In the multilayer coil component according to the second embodiment of the present invention, the distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor.

[0059] FIG. 4 is a perspective view schematically showing an example of the internal structure of the multilayer coil component according to the second embodiment of the present invention. FIG. 5 is an exploded perspective view of the multilayer coil component shown in FIG. 4.

[0060] In the multilayer coil component 2 shown in FIGS. 4 and 5, the distance between the third via conductor 43 and the fourth via conductor 44 (the length indicated by d2 in FIGS. 4 and 5) is shorter than the distance between the first via conductor 41 and the second via conductor 42 (the length indicated by d1 in FIGS. 4 and 5).

[0061] Since the first coil 21 is disposed at a position farther from the bottom surface (the first main surface 10a) of the base body 10 than the second coil 22, the first via conductor 41 and the second via conductor 42 are longer than the third via conductor 43 and the fourth via conductor 44. Therefore, even if the first conductor layer 51 and the second conductor layer 52 have the same shape, the inductance value of the first coil 21 with the longer via conductor becomes larger than the inductance value of the second coil 22 with the shorter via conductor. In addition, since the avoidance portion 55 exists in the second coil 22, the inner peripheral area of the coil becomes smaller, so that the inductance value becomes smaller than that of the first coil 21.

[0062] Therefore, by making the distance d2 between the third via conductor 43 and the fourth via conductor 44 shorter than the distance d1 between the first via conductor 41 and the second via conductor 42, the winding angle of the second conductor layer 52 is made larger than that of the first conductor layer 51. Thereby, the difference in inductance values between the first coil 21 and the second coil 22 can be reduced.

[0063] Furthermore, by making the distance d2 between the third via conductor 43 and the fourth via conductor 44 shorter than the distance d1 between the first via conductor 41 and the second via conductor 42, the coupling between the first coil 21 and the second coil 22 can be increased.

[0064] The shape perpendicular to the stacking direction of the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44 is not particularly limited, and examples include polygons such as quadrilaterals, circles, ellipses, sectors, and the like. In the example shown in FIG. 5, the shape perpendicular to the stacking direction of the first via conductor 41 and the second via conductor 42 is a sector, and the shape perpendicular to the stacking direction of the third via conductor 43 and the fourth via conductor 44 is a quadrilateral such as a square. Similar to FIG. 3, by making the first via conductor 41 and the second via conductor 42 located at the corner portions of the magnetic layer 11 constituting the element body 10 into sectors, the avoidance portion 55 can be made smaller and the inner diameter of the second coil 22 can be made larger. On the other hand, the third via conductor 43 and the fourth via conductor 44 may be sectors or may have shapes other than sectors.

[0065] The first external electrode 31, the second external electrode 32, the third external electrode 33, and the fourth external electrode 34 preferably have a larger area when viewed from the stacking direction so as to have the same shape as the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44, respectively.

[0066] The distance between the first external electrode 31 and the second external electrode 32 is preferably the same between the stacked coil component 1 and the stacked coil component 2.

[0067] Similarly, the distance between the third external electrode 33 and the fourth external electrode 34 is preferably the same between the stacked coil component 1 and the stacked coil component 2. The minimum value of the distance d2 between the third via conductor 43 and the fourth via conductor 44 is preferably the same as the distance between the third external electrode 33 and the fourth external electrode 34.

[0068] Among the first via conductor 41, the second via conductor 42, the third via conductor 43, and the fourth via conductor 44, at least the third via conductor 43 and the fourth via conductor 44 are preferably not exposed on the side surface of the element body 10. On the other hand, the first via conductor 41 and the second via conductor 42 may not be exposed on the side surface of the element body 10 or may be exposed on at least one side surface of the element body 10.

[0069] [Third Embodiment] In the multilayer coil component according to the third embodiment of the present invention, the base body further includes an insulating portion made of an insulating material having a lower magnetic permeability than the metal magnetic particles constituting the magnetic layer between the layer in which the first coil is disposed and the layer in which the second coil is disposed.

[0070] FIG. 6 is a perspective view schematically showing an example of the internal structure of the multilayer coil component according to the third embodiment of the present invention.

[0071] In the multilayer coil component 3 shown in FIG. 6, the base body 10 further includes an insulating portion 60 made of an insulating material having a lower magnetic permeability than the metal magnetic particles constituting the magnetic layer 11 between the layer in which the first coil 21 is disposed and the layer in which the second coil 22 is disposed.

[0072] In a plan view from the stacking direction (for example, the height direction T), the insulating portion 60 has a shape along the first coil 21. Therefore, the first coil 21 overlaps the insulating portion 60 in a plan view from the stacking direction (for example, the height direction T). On the other hand, the second coil 22 has a portion that does not overlap the insulating portion 60 in a plan view from the stacking direction (for example, the height direction T).

[0073] In a plan view from the stacking direction (for example, the height direction T), the insulating portion 60 preferably has a U-shaped with three sides.

[0074] By disposing the insulating portion 60 having a lower magnetic permeability than the magnetic layer 11 between the first coil 21 and the second coil 22, the insulation of the base body 10 can be improved, and the coupling between the first coil 21 and the second coil 22 can be increased.

[0075] As shown in FIG. 6, the insulating portion 60 preferably has a portion wider than the width of the first coil 21. In that case, the portion wider than the width of the first coil 21 may be in the entire insulating portion 60 or in a part of the insulating portion 60. Further, the insulating portion 60 preferably has a portion longer than the tip of the first coil 21. In that case, the insulating portion 60 may have a portion longer than the first end 30a of the first coil 21, may have a portion longer than the second end 30b of the first coil 21, or may have both.

[0076] The insulating material constituting the insulating portion 60 is preferably composed of metal magnetic particles having a smaller average particle diameter than the metal magnetic particles constituting the magnetic layer 11. Generally, even if the composition of the metal magnetic particles is the same between the magnetic layer and the insulating portion, the smaller the average particle diameter, the smaller the magnetic permeability and the more the insulation can be improved. Since metal magnetic particles having a large average particle diameter are arranged between the openings of the insulating portion 60, the inductance value of the second coil 22 increases, and the difference in the inductance values between the first coil 21 and the second coil 22 can be reduced.

[0077] The average particle diameter of the metal magnetic particles in the insulating portion 60 is preferably 0.2 μm or more and 5 μm or less, more preferably 0.3 μm or more and 3 μm or less, and still more preferably 0.5 μm or more and 2 μm or less.

[0078] Alternatively, the insulating material constituting the insulating portion 60 may be a non-magnetic material. In that case, the insulating material constituting the insulating portion 60 may be, for example, a resin material or a ceramic material.

[0079] The thickness of the insulating portion 60 may be greater than the thickness of the first conductor layer 51, may be smaller than the thickness of the first conductor layer 51, or may be equal to the thickness of the first conductor layer 51. Similarly, the thickness of the insulating portion 60 may be greater than the thickness of the second conductor layer 52, may be smaller than the thickness of the second conductor layer 52, or may be equal to the thickness of the second conductor layer 52.

[0080] The thickness of the insulating portion 60 is preferably 10 μm or more and 60 μm or less, more preferably 20 μm or more and 30 μm or less.

[0081] In the third embodiment of the present invention, an insulating portion may be disposed between the first coil and the second coil described in the first embodiment, or an insulating portion may be disposed between the first coil and the second coil described in the second embodiment.

[0082] [Fourth Embodiment] In the multilayer coil component according to the fourth embodiment of the present invention, a third coil and a fourth coil are further disposed inside the base body.

[0083] FIG. 7 is a perspective view schematically showing an example of the internal structure of the multilayer coil component according to the fourth embodiment of the present invention.

[0084] The multilayer coil component 4 shown in FIG. 7 includes a base body 10, a first coil 21, a second coil 22, a first external electrode 31, a second external electrode 32, a third external electrode 33, a fourth external electrode 34, a first via conductor 41, a second via conductor 42, a third via conductor 43, and a fourth via conductor 44. The multilayer coil component 4 further includes a third coil 23, a fourth coil 24, a fifth external electrode 35, a sixth external electrode 36, a seventh external electrode 37, an eighth external electrode 38, a fifth via conductor 45, a sixth via conductor 46, a seventh via conductor 47, and an eighth via conductor 48.

[0085] In the multilayer coil component 4, a first coil unit 71 is formed from the first coil 21 and the second coil 22, and a second coil unit 72 is formed from the third coil 23 and the fourth coil 24.

[0086] In the multilayer coil component 4, the first coil unit 71 and the second coil unit 72 face the same direction and are arranged adjacent to each other. In the example shown in FIG. 7, the first coil unit 71 and the second coil unit 72 are arranged adjacent to each other in the length direction L.

[0087] In the multilayer coil component 4, since two coil units are arranged inside the element body 10, the mounting area can be reduced as compared with the case where two multilayer coil components are arranged separately.

[0088] The third coil 23 is composed of the third conductor layer 53 and has a fifth terminal 30e and a sixth terminal 30f. The thickness of the third conductor layer 53 is preferably equal to the thickness of the first conductor layer 51.

[0089] The number of turns of the third coil 23 is preferably less than one turn. The third coil 23 is preferably composed of one layer of conductor layer. The number of turns of the third coil 23 may be the same as or different from the number of turns of the first coil 21.

[0090] The fourth coil 24 is located on the bottom surface side (the first main surface 10a side) of the element body 10 rather than the second coil 22 in the stacking direction of the magnetic layer 11 (for example, the height direction T).

[0091] The fourth coil 24 is composed of the fourth conductor layer 54 and has a seventh terminal 30g and an eighth terminal 30h. The thickness of the fourth conductor layer 54 is preferably equal to the thickness of the third conductor layer 53. Also, the thickness of the fourth conductor layer 54 is preferably equal to the thickness of the second conductor layer 52.

[0092] The number of turns of the fourth coil 24 is preferably less than one turn. The fourth coil 24 is preferably composed of one layer of conductor layer. The number of turns of the fourth coil 24 may be the same as or different from the number of turns of the third coil 23. Also, the number of turns of the fourth coil 24 may be the same as or different from the number of turns of the second coil 22.

[0093] In a plan view from the stacking direction (for example, the height direction T), the third coil 23 is preferably in a U-shaped configuration having three sides, and more preferably has the same shape as the first coil 21.

[0094] In a plan view from the stacking direction (for example, the height direction T), the fourth coil 24 preferably has a shape in which two corners of a U-shape having three sides are chamfered, and more preferably has the same shape as the second coil 22.

[0095] Specifically, the fourth coil 24 preferably includes an avoidance portion at a corner. The avoidance portion of the fourth coil 24 is preferably disposed inside the fifth via conductor 45 and inside the sixth via conductor 46 in a plan view from the stacking direction (for example, the height direction T) in order to avoid the fifth via conductor 45 and the sixth via conductor 46. The shape of the avoidance portion is not particularly limited and may be linear or curved. Further, the avoidance portion may be composed of two or more line segments.

[0096] The fifth external electrode 35 and the sixth external electrode 36 are provided on the bottom surface (the first main surface 10a) of the element body 10 and are electrically connected to the third coil 23. Specifically, the fifth external electrode 35 is connected to the fifth end 30e of the third coil 23, and the sixth external electrode 36 is connected to the sixth end 30f of the third coil 23.

[0097] The seventh external electrode 37 and the eighth external electrode 38 are provided on the bottom surface (the first main surface 10a) of the element body 10 and are electrically connected to the fourth coil 24. Specifically, the seventh external electrode 37 is connected to the seventh end 30g of the fourth coil 24, and the eighth external electrode 38 is connected to the eighth end 30h of the fourth coil 24.

[0098] The fifth external electrode 35 and the sixth external electrode 36, and the seventh external electrode 37 and the eighth external electrode 38 are arranged at positions facing each other, and preferably, a straight line connecting the fifth external electrode 35 and the seventh external electrode 37 and a straight line connecting the sixth external electrode 36 and the eighth external electrode 38 do not intersect.

[0099] In the example shown in FIG. 7, the third external electrode 33 and the fifth external electrode 35 face each other, and the fourth external electrode 34 and the sixth external electrode 36 face each other.

[0100] The first external electrode 31 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a of the element body 10 and at least one of the first side surface 10c and the third side surface 10e.

[0101] The second external electrode 32 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a of the element body 10 and at least one of the second side surface 10d and the third side surface 10e.

[0102] The third external electrode 33 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a and the first side surface 10c of the element body 10.

[0103] The fourth external electrode 34 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a and the second side surface 10d of the element body 10.

[0104] The fifth external electrode 35 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a and the first side surface 10c of the element body 10.

[0105] The sixth external electrode 36 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a and the second side surface 10d of the element body 10.

[0106] The seventh external electrode 37 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a of the element body 10 and at least one of the first side surface 10c and the third side surface 10e.

[0107] The eighth external electrode 38 may be provided only on the first main surface 10a of the element body 10, or may be provided across the first main surface 10a of the element body 10 and at least one of the second side surface 10d and the third side surface 10e.

[0108] The first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 may each be made of a conductive material such as Ag. For example, the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 each include a base electrode layer containing Ag and one or more plating layers provided on the base electrode layer. The plating layer preferably includes a Cu plating layer provided on the base electrode layer, or includes a Ni plating layer provided on the base electrode layer and further includes a Sn plating layer provided on the Ni plating layer.

[0109] The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 are each preferably 5 μm or more and 100 μm or less, and more preferably 10 μm or more and 50 μm or less. The thicknesses of the first external electrode 31, the second external electrode 32, the third external electrode 33, the fourth external electrode 34, the fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 are preferably equal to each other.

[0110] The fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48 are provided inside the element body 10.

[0111] The fifth via conductor 45 connects the fifth end 30e of the third coil 23 and the fifth external electrode 35. The fifth via conductor 45 preferably extends along the stacking direction (for example, the height direction T). The fifth via conductor 45 may have a stacked structure.

[0112] The sixth via conductor 46 connects the sixth end 30f of the third coil 23 and the sixth external electrode 36. The sixth via conductor 46 preferably extends along the stacking direction (for example, the height direction T). The sixth via conductor 46 may have a stacked structure.

[0113] The seventh-via conductor 47 connects the seventh end 30g of the fourth coil 24 and the seventh external electrode 37. The seventh-via conductor 47 preferably extends along the stacking direction (for example, the height direction T). The seventh-via conductor 47 may have a stacked structure.

[0114] The eighth-via conductor 48 connects the eighth end 30h of the fourth coil 24 and the eighth external electrode 38. The eighth-via conductor 48 preferably extends along the stacking direction (for example, the height direction T). The eighth-via conductor 48 may have a stacked structure.

[0115] In the multilayer coil component 4, a set of first coil units 71 and second coil units 72 may be arranged inside the base body 10, or two or more sets of first coil units 71 and second coil units 72 may be arranged.

[0116] [Fifth Embodiment] In the multilayer coil component according to the fifth embodiment of the present invention, the first coil unit and the second coil unit are arranged symmetrically with respect to a plane.

[0117] FIG. 8 is a perspective view schematically showing an example of the internal structure of the multilayer coil component according to the fifth embodiment of the present invention.

[0118] In the multilayer coil component 5 shown in FIG. 8, the first coil unit 71 and the second coil unit 72 are arranged adjacent to each other facing in opposite directions. Further, the first coil unit 71 and the second coil unit 72 are arranged symmetrically with respect to a plane.

[0119] In the example shown in FIG. 8, the third external electrode 33 and the eighth external electrode 38 face each other across the symmetry plane, and the fourth external electrode 34 and the seventh external electrode 37 face each other.

[0120] When the first coil unit 71 and the second coil unit 72 are arranged symmetrically with respect to a plane in the orientation shown in FIG. 8, the coupling between the first coil 21 and the second coil 22 and the coupling between the third coil 23 and the fourth coil 24 can be increased.

[0121] Table 1 shows the coupling coefficients between the coils in the stacked coil component 4 shown in FIG. 7 and the stacked coil component 5 shown in FIG. 8. In Table 1, L1 means the first coil 21, L2 means the second coil 22, L3 means the third coil 23, and L4 means the fourth coil 24. The coupling coefficient between the coils is calculated from the 3D magnetic field analysis results by the magnetic field analysis software Femtet (manufactured by Murata Software Co., Ltd.).

[0122]

Table 1

[0123] From Table 1, in the stacked coil component 5 where the first coil unit 71 and the second coil unit 72 are arranged symmetrically with respect to the plane in the orientation of FIG. 8, the absolute values of the coupling coefficients between L1-L2 and L3-L4 are larger than those in the stacked coil component 4 where the first coil unit 71 and the second coil unit 72 are not arranged symmetrically with respect to the plane, and it can be seen that the coupling between the coils is high.

[0124] In the stacked coil component 5, one set of the first coil unit 71 and the second coil unit 72 may be arranged inside the element body 10, or two or more sets of the first coil unit 71 and the second coil unit 72 may be arranged. When two or more sets of the first coil unit 71 and the second coil unit 72 are arranged inside the element body 10, at least one set of the first coil unit 71 and the second coil unit 72 may be arranged symmetrically with respect to the plane, but it is preferable that all sets of the first coil unit 71 and the second coil unit 72 are arranged symmetrically with respect to the plane.

[0125] As described below, in the fourth and fifth embodiments, the first coil unit and the second coil unit may be configured from the first coil and the second coil described in the first embodiment, or the first coil unit and the second coil unit may be configured from the first coil and the second coil described in the second embodiment. In that case, the first coil unit and the second coil unit may be configured from the first coil and the second coil of the same embodiment, or the first coil unit and the second coil unit may be configured from the first coil and the second coil of different embodiments. Further, an insulating portion may be disposed between the first coil and the second coil in at least one of the first coil unit and the second coil unit.

[0126] In the multilayer coil component 4 shown in FIG. 7 and the multilayer coil component 5 shown in FIG. 8, the distance between the seventh via conductor 47 and the eighth via conductor 48 may be shorter than the distance between the fifth via conductor 45 and the sixth via conductor 46.

[0127] The shape perpendicular to the stacking direction of the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48 is not particularly limited, and examples thereof include polygons such as quadrilaterals, circles, ellipses, and sectors.

[0128] The fifth external electrode 35, the sixth external electrode 36, the seventh external electrode 37, and the eighth external electrode 38 preferably have a larger area when viewed from the stacking direction so as to have the same shape as the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48.

[0129] Of the fifth via conductor 45, the sixth via conductor 46, the seventh via conductor 47, and the eighth via conductor 48, at least the seventh via conductor 47 and the eighth via conductor 48 are preferably not exposed on the side surface of the base body 10. On the other hand, the fifth via conductor 45 and the sixth via conductor 46 may not be exposed on the side surface of the base body 10, or may be exposed on at least one side surface of the base body 10.

[0130] In the multilayer coil component 4 shown in FIG. 7 and the multilayer coil component 5 shown in FIG. 8, the base body 10 may further include an insulating portion made of an insulating material having a lower magnetic permeability than the metal magnetic particles constituting the magnetic layer 11 between the layer in which the third coil 23 is disposed and the layer in which the fourth coil 24 is disposed.

[0131] In a plan view from the stacking direction (for example, the height direction T), the insulating portion has a shape along the third coil 23. Therefore, the third coil 23 overlaps with the insulating portion in a plan view from the stacking direction (for example, the height direction T). On the other hand, the fourth coil 24 has a portion that does not overlap with the insulating portion in a plan view from the stacking direction (for example, the height direction T).

[0132] In a plan view from the stacking direction (for example, the height direction T), the insulating portion preferably has a U-shaped with three sides.

[0133] The insulating portion preferably has a portion that is wider than the width of the third coil 23. In that case, the portion that is wider than the width of the third coil 23 may be in the whole of the insulating portion or in a part of the insulating portion. Further, the insulating portion preferably has a portion that is longer than the tip of the third coil 23. In that case, the insulating portion may have a portion that is longer than the fifth end 30e of the third coil 23, may have a portion that is longer than the sixth end 30f of the third coil 23, or may have both.

[0134] The insulating material constituting the insulating portion preferably consists of metal magnetic particles having a smaller average particle size than the metal magnetic particles constituting the magnetic layer 11.

[0135] The following content is disclosed in this specification.

[0136] <1> A base body constituted by laminating a plurality of magnetic layers made of metal magnetic particles, A first coil disposed inside the above base body, composed of a first conductor layer, and having a first end and a second end, It is disposed inside the above-mentioned substrate, composed of a second conductor layer, having a third end and a fourth end, and is a second coil located on the bottom surface side of the above-mentioned substrate relative to the above-mentioned first coil in the stacking direction of the above-mentioned magnetic layer, A first external electrode provided on the bottom surface of the above-mentioned substrate and connected to the above-mentioned first end of the above-mentioned first coil, A second external electrode provided on the bottom surface of the above-mentioned substrate and connected to the above-mentioned second end of the above-mentioned first coil, A third external electrode provided on the bottom surface of the above-mentioned substrate and connected to the above-mentioned third end of the above-mentioned second coil, A fourth external electrode provided on the bottom surface of the above-mentioned substrate and connected to the above-mentioned fourth end of the above-mentioned second coil, A first via conductor provided inside the above-mentioned substrate and connecting the above-mentioned first end of the above-mentioned first coil and the above-mentioned first external electrode, A second via conductor provided inside the above-mentioned substrate and connecting the above-mentioned second end of the above-mentioned first coil and the above-mentioned second external electrode, A third via conductor provided inside the above-mentioned substrate and connecting the above-mentioned third end of the above-mentioned second coil and the above-mentioned third external electrode, A fourth via conductor provided inside the above-mentioned substrate and connecting the above-mentioned fourth end of the above-mentioned second coil and the above-mentioned fourth external electrode, and a laminated coil component comprising the same.

[0137] <2> The number of turns of the above-mentioned first coil and the above-mentioned second coil is less than 1 turn each, and the laminated coil component according to <1>.

[0138] <3> The above-mentioned first coil and the above-mentioned second coil are each composed of one layer of conductor layer, and the laminated coil component according to <2>.

[0139] <4> The above-mentioned first external electrode and the above-mentioned second external electrode, and the above-mentioned third external electrode and the above-mentioned fourth external electrode are arranged at positions facing each other, and a straight line connecting the above-mentioned first external electrode and the above-mentioned third external electrode and a straight line connecting the above-mentioned second external electrode and the above-mentioned fourth external electrode do not intersect, and the laminated coil component according to any one of <1> to <3>.

[0140] <5> In a plan view from the stacking direction, the first coil has a U shape with three sides, and the second coil has a shape in which two corners of the U shape with three sides are chamfered, the stacked coil component according to <4>.

[0141] <6> The distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor, the stacked coil component according to <4> or <5>.

[0142] <7> The base body further includes an insulating portion made of an insulating material having a lower magnetic permeability than the metal magnetic particles constituting the magnetic layer between the layer in which the first coil is disposed and the layer in which the second coil is disposed. In a plan view from the stacking direction, the insulating portion has a shape along the first coil, the stacked coil component according to any one of <1> to <6>.

[0143] <8> The insulating portion has a portion wider than the width of the first coil, the stacked coil component according to <7>.

[0144] <9> The insulating material constituting the insulating portion is made of metal magnetic particles having a smaller average particle diameter than the metal magnetic particles constituting the magnetic layer, the stacked coil component according to <7> or <8>.

[0145] <10> Among the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor, at least the third via conductor and the fourth via conductor are not exposed on the side surface of the base body, the stacked coil component according to any one of <1> to <9>.

[0146] <11> A third coil that is disposed inside the base body, is composed of a third conductor layer, and has a fifth end and a sixth end, It is disposed inside the above-mentioned base body, composed of a fourth conductor layer, having a seventh terminal and an eighth terminal, and located on the bottom surface side of the above-mentioned base body with respect to the above-mentioned third coil in the above-mentioned stacking direction, a fourth coil; A fifth external electrode provided on the bottom surface of the above-mentioned base body and connected to the fifth terminal of the above-mentioned third coil; A sixth external electrode provided on the bottom surface of the above-mentioned base body and connected to the sixth terminal of the above-mentioned third coil; A seventh external electrode provided on the bottom surface of the above-mentioned base body and connected to the seventh terminal of the above-mentioned fourth coil; An eighth external electrode provided on the bottom surface of the above-mentioned base body and connected to the eighth terminal of the above-mentioned fourth coil; A fifth via conductor provided inside the above-mentioned base body and connecting the fifth terminal of the above-mentioned third coil and the above-mentioned fifth external electrode; A sixth via conductor provided inside the above-mentioned base body and connecting the sixth terminal of the above-mentioned third coil and the above-mentioned sixth external electrode; A seventh via conductor provided inside the above-mentioned base body and connecting the seventh terminal of the above-mentioned fourth coil and the above-mentioned seventh external electrode; An eighth via conductor provided inside the above-mentioned base body and connecting the eighth terminal of the above-mentioned fourth coil and the above-mentioned eighth external electrode, and further comprising; A first coil unit is composed of the above-mentioned first coil and the above-mentioned second coil; A second coil unit is composed of the above-mentioned third coil and the above-mentioned fourth coil; The above-mentioned first coil unit and the above-mentioned second coil unit are arranged adjacent to each other side by side, the laminated coil component according to any one of <1> to <10>.

[0147] <12> The above-mentioned first coil unit and the above-mentioned second coil unit are arranged symmetrically with respect to a plane, the laminated coil component according to <11>.

[0148] <13> With the symmetric plane interposed therebetween, the above-mentioned third external electrode and the above-mentioned eighth external electrode face each other, and the above-mentioned fourth external electrode and the above-mentioned seventh external electrode face each other, the laminated coil component according to <12>.

Explanation of reference numerals

[0149] 1, 2, 3, 4, and 5 stacked coil components 10 body 10a first main surface (bottom surface) 10b second main surface 10c first side surface 10d second side surface 10e third side surface 10f fourth side surface 11 magnetic layer 21 first coil 22 second coil 23 third coil 24 fourth coil 30a first end 30b second end 30c third end 30d fourth end 30e fifth end 30f sixth end 30g seventh end 30h eighth end 31 first external electrode 32 second external electrode 33 third external electrode 34 fourth external electrode 35 fifth external electrode 36 sixth external electrode 37 seventh external electrode 38 eighth external electrode 41 first via conductor 42 second via conductor 43 third via conductor 44 fourth via conductor 45 fifth via conductor 46 sixth via conductor 47 seventh via conductor 48 eighth via conductor 51 first conductor layer 52 second conductor layer 53 third conductor layer 54 fourth conductor layer 55 avoidance part 60 insulating part 71 first coil unit 72 second coil unit d1 Distance between the first via conductor and the second via conductor d2 Distance between the third via conductor and the fourth via conductor L Length direction T Height direction W Width direction

Claims

1. An element formed by laminating a plurality of magnetic layers made of metal magnetic particles, A first coil disposed inside the element, composed of a first conductor layer, and having a first end and a second end, A second coil disposed inside the element, composed of a second conductor layer, having a third end and a fourth end, and located on the bottom surface side of the element with respect to the first coil in the stacking direction of the magnetic layers, A first external electrode provided on the bottom surface of the element and connected to the first end of the first coil, A second external electrode provided on the bottom surface of the element and connected to the second end of the first coil, A third external electrode provided on the bottom surface of the element and connected to the third end of the second coil, A fourth external electrode provided on the bottom surface of the element and connected to the fourth end of the second coil, A first via conductor provided inside the element and connecting the first end of the first coil and the first external electrode, A second via conductor provided inside the element and connecting the second end of the first coil and the second external electrode, A third via conductor provided inside the element and connecting the third end of the second coil and the third external electrode, A fourth via conductor provided inside the element and connecting the fourth end of the second coil and the fourth external electrode, comprising a stacked coil component.

2. The number of turns of the first coil and the second coil is less than 1 turn each, The stacked coil component according to Claim 1.

3. The first coil and the second coil are each composed of a single layer of conductor layer, The stacked coil component according to Claim 2.

4. The first external electrode and the second external electrode, and the third external electrode and the fourth external electrode are arranged at positions facing each other, and a straight line connecting the first external electrode and the third external electrode and a straight line connecting the second external electrode and the fourth external electrode do not intersect, The stacked coil component according to Claim 1.

5. In a plan view from the stacking direction, the first coil has a U-shape with three sides, and the second coil has a shape in which two corners of the U-shape with three sides are chamfered, The stacked coil component according to Claim 4.

6. The distance between the third via conductor and the fourth via conductor is shorter than the distance between the first via conductor and the second via conductor, The stacked coil component according to Claim 4.

7. The base body further includes an insulating portion made of an insulating material having a lower magnetic permeability than the metal magnetic particles constituting the magnetic layer, between the layer in which the first coil is disposed and the layer in which the second coil is disposed. The laminated coil component according to claim 1, wherein in a plan view from the stacking direction, the insulating portion has a shape along the first coil.

8. The laminated coil component according to claim 7, wherein the insulating portion has a portion wider than the width of the first coil.

9. The laminated coil component according to claim 7, wherein the insulating material constituting the insulating portion is made of metal magnetic particles having a smaller average particle diameter than the metal magnetic particles constituting the magnetic layer.

10. The laminated coil component according to claim 1, wherein at least the third via conductor and the fourth via conductor among the first via conductor, the second via conductor, the third via conductor, and the fourth via conductor are not exposed on the side surface of the base body.

11. A third coil disposed inside the base body, composed of a third conductor layer, and having a fifth end and a sixth end; A fourth coil disposed inside the base body, composed of a fourth conductor layer, having a seventh end and an eighth end, and located on the bottom surface side of the base body relative to the third coil in the stacking direction; A fifth external electrode provided on the bottom surface of the base body and connected to the fifth end of the third coil; A sixth external electrode provided on the bottom surface of the base body and connected to the sixth end of the third coil; A seventh external electrode provided on the bottom surface of the base body and connected to the seventh end of the fourth coil; An eighth external electrode provided on the bottom surface of the base body and connected to the eighth end of the fourth coil; A fifth via conductor provided inside the base body and connecting the fifth end of the third coil and the fifth external electrode; A sixth via conductor provided inside the base body and connecting the sixth end of the third coil and the sixth external electrode; A seventh via conductor provided inside the base body and connecting the seventh end of the fourth coil and the seventh external electrode; Further comprising an eighth via conductor provided inside the base body and connecting the eighth end of the fourth coil and the eighth external electrode, A first coil unit is constituted by the first coil and the second coil, A second coil unit is constituted by the third coil and the fourth coil. The first coil unit and the second coil unit are arranged side by side adjacent to each other. The multilayer coil component according to any one of claims 1 to 10.

12. The first coil unit and the second coil unit are arranged symmetrically with respect to a plane. The multilayer coil component according to claim 11.

13. With a symmetry plane interposed therebetween, the third external electrode and the eighth external electrode face each other, and the fourth external electrode and the seventh external electrode face each other. The multilayer coil component according to claim 12.

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