Patent Publication Number: US-2022238270-A1

Title: Inductor component

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims benefit of priority to Japanese Patent Application 2021-009560, filed Jan. 25, 2021, the entire content of which is incorporated herein by reference. 
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an inductor component 
     Background Art 
     A conventional inductor component is described in Japanese Laid-Open Patent Publication No. 2015-015297. This inductor component includes an element body and a coil disposed in the element body. The coil has multiple coil wirings laminated along the axis of the coil and via wirings connecting the multiple coil wirings. The coil wiring has a wiring part and a pad part disposed at an end portion of the wiring part and connected to the via wiring. 
     SUMMARY 
     In the connection between the coil wiring and the via wiring, it is necessary to ensure an area of contact of the via wiring with the coil wiring (i.e., the cross-sectional area of the via wiring) so as to prevent the via wiring from peeling off from the coil wiring. Additionally, considering a deviation of a position of connection of the via wiring to the coil wiring and a variation in the size of the via wiring, it is necessary to increase the area of the pad part connected to the via wiring. 
     The pad part is typically projected toward the inner circumferential side of the coil (hereinafter referred to as the inside of the coil) relative to the wiring part when viewed in the axial direction of the coil. In addition, typically, when viewed in the axial direction of the coil, the center of the pad part and the center of the via wiring are often closer to the inside of the coil than the center of the wiring part. This is because if the pad part is projected toward the outer circumferential side of the coil (hereinafter referred to as the outside of the coil) relative to the wiring part, a dimensional margin for manufacturing the element body outside the coil becomes smaller, so that the diameter of the coil needs to be reduced. As described above, conventionally, the pad part significantly protrudes toward the inside of the coil relative to the wiring part. 
     The inventor of the present application focused on the fact that the pad part protruding toward the inside of the coil interferes with a magnetic flux flowing inside the coil. It was found that the loss of the magnetic flux increases due to the interference with the flow of the magnetic flux of the coil, which lowers the acquisition efficiency of the L value and lowers the Q value. Particularly, when the inductor component becomes small, the width of the wiring part becomes smaller, while the areas of the via wiring and the pad part cannot be made smaller due to the necessity of ensuring the reliability of connection of the via wiring to the coil wiring, and the amount of protrusion of the pad part becomes larger, further interfering with the magnetic flux flow of the coil. 
     Therefore, the present disclosure provides an inductor component reducing interference with a flow of a coil magnetic flux. 
     That is, an aspect of the present disclosure provides an inductor component comprising an element body; a coil disposed in the element body; and a first external electrode and a second external electrode disposed on the element body and electrically connected to the coil. The element body includes a first end surface and a second end surface opposite to each other, a first side surface and a second side surface opposite to each other, and a bottom surface connected between the first end surface and the second end surface and between the first end surface and the second end surface, and a top surface opposite to the bottom surface. The coil has a helical structure in which the coil is wound while proceeding along an axis such that the axis is parallel to the bottom surface of the element body and intersects with the first side surface and the second side surface. The coil includes multiple coil wirings laminated along the axis and each wound along a plane, and a via wiring connecting the multiple coil wirings. The coil wirings include a wiring part extending along a plane and a pad part disposed at an end portion of the wiring part and connected to the via wiring. Also, in the first coil wiring and the second coil wiring adjacent to each other in the axial direction, the first coil wiring is located on a central side in the axial direction of the coil relative to the second coil wiring, and a first pad part of the first coil wiring is adjacent to a second wiring part of the second coil wiring in the axial direction, and when viewed in the axial direction, a protrusion amount of the first pad part from the second wiring part to the inside of the coil is 1.4 times or less of a width dimension of the second wiring part. 
     The protrusion amount of the first pad part refers to a maximum value of protrusion of the first pad part from the second wiring part when viewed in the axial direction in terms of the portion of the second wiring part adjacent to the first pad part. The width dimension of the second wiring part refers to a dimension in the width direction orthogonal to the extending direction of the second wiring part when viewed in the axial direction. The protrusion amount of the first pad part being 1.4 times or less of the width dimension of the second wiring part includes the case that the protrusion amount of the first pad part is zero (0) or minus (−). Therefore, this includes not only the case that the first pad part protrudes from the second wiring part, but also the case that the first pad part does not protrudes from the second wiring part, and that a tip of the protrusion of the first pad part to the inside of the coil is located on the outside of the coil relative to a tip of the second wiring part on the inside of the coil. 
     According to the embodiment, since the protrusion amount of the first pad part is 1.4 times or less of the width dimension of the second wiring part, the magnetic flux flowing inside the coil is less interfered with by the first pad part and the loss of the magnetic flux is reduced, so that the acquisition efficiency of the L value can be improved, and the decrease of the Q value can be suppressed. 
     Preferably, in one embodiment of the inductor component, a length of the via wiring in an extending direction of the coil wiring is longer than a length of the via wiring in a width direction of the coil wiring. 
     According to the embodiment, the via wiring is formed so that the length of the coil wiring in the extending direction becomes longer than the length of the coil wiring in the width direction. For example, the shape of the via wiring is rectangular, elliptical, or oval. Therefore, the contact area of the via wiring for the coil wiring (i.e., the cross-sectional area of the via wiring) can be ensured, and the connection reliability of the via wiring for the coil wiring  21  can be ensured 
     Preferably, in one embodiment of the inductor component, a size of the inductor component in a direction parallel to the bottom surface and perpendicular to the axis is less than 0.7 mm, and a size of the inductor component in a direction parallel to the axis is less than 0.4 mm. 
     According to the embodiment, even if the inductor component is reduced in size, the interference with the magnetic flux of the coil can effectively be reduced. 
     Preferably, in one embodiment of the inductor component, the protrusion amount is 21 μm or less. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the center of the first pad part is located at the center in the width direction of the second wiring part when viewed in the axial direction. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the radius of the first pad part is 18 μm or less when viewed in the axial direction. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the center of the first pad part is located at the center in the width direction of the second wiring part when viewed in the axial direction, and the radius of the first pad part is 18 μm or less. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the protrusion amount is 10.5 μm or less. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the diameter of the first pad part is equal to the width dimension of the second wiring part when viewed in the axial direction. 
     According to the embodiment, the magnetic flux is hardly blocked by the pad part. 
     Preferably, in one embodiment of the inductor component, the inner diameter of the coil increases from the center in the axial direction of the coil toward both ends. 
     The inner diameter of the coil increases continuously or stepwise. 
     According to the embodiment, since the inner diameter of the coil increases from the center in the axial direction of the coil toward both ends, the flow of the magnetic flux is less interfered with at both ends of the coil. As a result, the loss at both ends of the coil can be reduced, and the decrease of the Q value can be suppressed. 
     Preferably, in one embodiment of the inductor component, in at least two coil wirings of all the coil wirings, the inner diameter of one coil wiring of the two coil wirings adjacent to each other in the axial direction is larger than the inner diameter of the other coil wiring, and when viewed in the axial direction, a deviation width between an inner surface of the one coil wiring and an inner surface of the other coil wiring is 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm). 
     The inner diameter of the coil wiring refers to the inner diameter of the wiring part of the coil wiring. The inner surface of the coil wiring refers to the inner surface of the wiring part of the coil wiring. The deviation width may not be constant along the extending direction of the same coil wiring. 
     According to the embodiment, the deviation width between the inner surface of the one coil wiring and the inner surface of the other coil wiring is 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm), so that the inner surface of the coil wiring can easily be arranged along the magnetic flux, and the flow of the magnetic flux is hardly interfered with on the inner surface of the coil wiring. 
     Preferably, in one embodiment of the inductor component, in all the coil wirings, the inner diameter of the one coil wiring is larger than the inner diameter of the other coil wiring, and when viewed in the axial direction, a deviation width between an inner surface of the one coil wiring and an inner surface of the other coil wiring is 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm) 
     According to the embodiment, the inner surfaces of all the coil wirings are easily arranged along the magnetic flux, and the flow of the magnetic flux is less likely to be interfered with on the inner surfaces of the coil wirings. 
     Preferably, in one embodiment of the inductor component, regarding the deviation width, the deviation width in the direction intersecting with the first end surface and the second end surface in a portion of the coil wiring extending in a direction intersecting with the top surface and the bottom surface is larger than the deviation width in the direction intersecting with the top surface and the bottom surface in a portion of the coil wiring extending in a direction intersecting with first end surface and the second end surface. 
     According to the embodiment, the size of the element body in the direction intersecting with the first end surface and the second end surface intersect is usually larger than the size of the element body in the direction intersecting with the top surface and the bottom surface. Also, the element body has a margin in the space for extending the portion of the coil wiring extending in the direction intersecting with first end surface and the second end surface as compared to the space for extending the portion of the coil wiring extending in the direction intersecting with the top surface and the bottom surface. Therefore, the deviation width can be made larger in the direction intersecting with the first end surface and the second end surface in the portion of the coil wiring extending in the direction intersecting with the top surface and the bottom surface. 
     Preferably, in one embodiment of the inductor component, the width dimension of the wiring part of all the coil wirings is the same, the first coil wiring corresponds to a portion having a small inner diameter of the coil, and when viewed in the axial direction, the protrusion amount from the second wiring part of the first pad part to the outside of the coil is greater than or equal to the protrusion amount from the second wiring part of the first pad part to the inside of the coil. 
     According to the embodiment, since a side gap on the radial outside of the first coil wiring is wider than a side gap on the radial outside of the coil wiring corresponding to a portion having a large inner diameter of the coil, and therefore, even if the first pad part is shifted to the side gap on the outside of the first coil wiring, the constant side gap can be ensured on the radial outside of the entire coil. Since the side gap can be ensured in this way, it is not necessary to reduce the diameter of the coil or increase the size of the element body. 
     Additionally, by simply shifting the first pad part to the side gap on the outside of the first coil wiring, the protrusion amount of the first pad part to the inside of the coil can easily be reduced, and furthermore, the cross-sectional area of the first pad part and the cross-sectional area of the via wiring can be ensured, so that the connection reliability of the via wiring for the coil wiring can be ensured. 
     Preferably, in one embodiment of the inductor component, the first coil wiring corresponds to a portion having the smallest inner diameter of the coil. 
     According to the embodiment, the side gap on the radial outside of the first coil wiring is the widest among the side gaps on the outside of the entire coil. Therefore, even if the first pad part is shifted to the side gap on the outside of the first coil wiring, the side gap on the outside of the entire coil can more reliably be ensured. 
     Preferably, in one embodiment of the inductor component, the first external electrode is formed from the first end surface to the bottom surface, the second external electrode is formed from the second end surface to the bottom surface, and the first pad part is located on the top surface side relative to the bottom surface side. 
     According to the embodiment, even if the first pad part is shifted to the side gap on the outside of the first coil wiring on the top surface side, the side gap on the outside of the entire coil can be ensured. Specifically, although it is difficult to ensure the side gap on the outside of the coil on the top surface side as compared to the bottom surface side since the external electrodes do not exist, the side gap on the outside of the coil can be ensured on the top surface side by achieving the configuration described above. 
     Preferably, in one embodiment of the inductor component, in the coil wiring located on the outer side in the axial direction among all the coil wirings, the pad part is located on the bottom surface side relative to an end edge on the top surface side of the first external electrode and an end edge on the top surface side of the second external electrode when viewed in the axial direction. 
     According to the embodiment, although the inner diameter of the coil wirings located on the outer side in the axial direction becomes large, the pad part is located on the bottom surface side relative to the end edge on the top surface side of the first external electrode and the end edge on the top surface side of the second external electrode, so that even if the protrusion of the pad part is shifted to the outside of the coil, an influence on the side gap of the entire coil is small, and the protrusion of the pad part to the inside of the coil can effectively be reduced. 
     According to the inductor component of an aspect of the present disclosure, the interference with the flow of the coil magnetic flux is reduced. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view showing a first embodiment of an inductor component; 
         FIG. 2  is an exploded view of the inductor component; 
         FIG. 3  is a perspective front view from a first side surface side of the inductor component; 
         FIG. 4  is a cross-sectional view taken along a line X-X of  FIG. 3 ; 
         FIG. 5  is a simplified view of  FIG. 4 ; 
         FIG. 6  is cross-sectional view showing another shape of a via wiring; 
         FIG. 7  is a cross-sectional view showing another shape of a pad part; 
         FIG. 8  is a cross-sectional view showing another shape of the pad part; 
         FIG. 9  is a cross-sectional view showing another shape of the pad part; 
         FIG. 10  is a cross-sectional view showing another shape of the pad part; 
         FIG. 11  is a cross-sectional view showing another shape of the pad part; 
         FIG. 12A  is a schematic view of a magnetic field strength of  FIG. 7 ; 
         FIG. 12B  is a schematic view of a magnetic field strength of  FIG. 9 ; 
         FIG. 12C  is a schematic view of a magnetic field strength of  FIG. 11 ; 
         FIG. 12D  is a schematic view of a magnetic field strength of a comparative example; 
         FIG. 13A  is a graph showing a relationship between the frequency and the Q value; 
         FIG. 13B  is a graph showing a relative value of the Q value between examples and the comparative example; 
         FIG. 14  is a cross-sectional view showing a second embodiment of the inductor component; 
         FIG. 15  is a schematic view of a magnetic field strength of  FIG. 14 ; 
         FIG. 16A  is a cross-sectional view showing another shape of the inductor component of  FIG. 14 ; 
         FIG. 16B  is a cross-sectional view showing another shape of the inductor component of  FIG. 14 ; 
         FIG. 17A  is a cross-sectional view showing another shape of the inductor component of  FIG. 14 ; 
         FIG. 17B  is a cross-sectional view showing another shape of the inductor component of  FIG. 14 ; 
         FIG. 18  is a cross-sectional view showing another shape of the inductor component of  FIG. 14 ; 
         FIG. 19A  is a cross-sectional view showing another shape of the inductor component of  FIG. 18 ; 
         FIG. 19B  is a cross-sectional view showing another shape of the inductor component of  FIG. 18 ; 
         FIG. 20A  is a cross-sectional view showing another shape of the inductor component of  FIG. 18 ; 
         FIG. 20B  is a cross-sectional view showing another shape of the inductor component of  FIG. 18 ; 
         FIG. 21  a perspective front view from the first side surface side showing another shape of an inductor component; 
         FIG. 22  is a cross-sectional view showing a third embodiment of the inductor component; and 
         FIG. 23  is a perspective front view showing a preferable form of the inductor component. 
     
    
    
     DETAILED DESCRIPTION 
     An inductor component of an aspect of the present disclosure will now be described in detail with reference to shown embodiments. The drawings include schematics and may not reflect actual dimensions or ratios. 
     First Embodiment 
       FIG. 1  is a perspective view showing a first embodiment of an inductor component.  FIG. 2  is an exploded view of the inductor component.  FIG. 3  is a perspective front view from a first side surface side of the inductor component.  FIG. 4  is a cross-sectional view taken along a line X-X of  FIG. 3 . 
     As shown in  FIGS. 1 to 4 , the inductor component  1  includes an element body  10 , a coil  20  disposed in the element body  10 , and a first external electrode  30  and a second external electrode  40  disposed on the element body  10  and electrically connected to the coil. 
     The inductor component  1  is electrically connected via the first and second external electrodes  30 ,  40  to a wiring of a circuit board not shown. The inductor component  1  is used as an impedance matching coil (matching coil) of a high-frequency circuit, for example, and is used for an electronic device such as a personal computer, a DVD player, a digital camera, a TV, a portable telephone, automotive electronics, and medical/industrial machinery. However, the inductor component  1  is not limited to these uses and is also usable for a tuning circuit, a filter circuit, and a rectifying/smoothing circuit, for example. 
     The element body  10  is formed by laminating multiple insulating layers  11 . The insulating layers  11  are made of a magnetic material or a non-magnetic material. Examples of the magnetic material include ferrite etc., and examples of the non-magnetic material include glass, alumina, resin, etc. The multiple insulating layers  11  are laminated in a W direction. The insulating layer  11  has a layer shape extending in an L-T plane orthogonal to the lamination direction in the W direction. In the multiple insulating layers  11 , an interface between two adjacent insulating layers  11  may not be clear due to firing etc. 
     The element body  10  is formed in a substantially rectangular parallelepiped shape. The element body  10  has a first end surface  13  and a second end surface  14  opposite to each other, a first side surface  15  and a second side surface  16  opposite to each other, and a bottom surface  17  connected between the first end surface  13  and the second end surface  14  and between the first end surface  15  and the second end surface  16 , and a top surface  18  opposite to the bottom surface  17 . Therefore, the outer surface of the element body  10  is made up of the first end surface  13 , the second end surface  14 , the first side surface  15 , the second side surface  16 , the bottom surface  17 , and the top surface  18 . 
     As shown in  FIG. 1 , an L direction is a direction perpendicular to the first end surface  13  and the second end surface  14 , and the W direction is a direction perpendicular to the first side surface  15  and the second side surface  16 , a T direction is a direction perpendicular to the bottom surface  17  and the top surface  18 . The L direction, the W direction, and the T direction are orthogonal to each other. In  FIG. 2 , the insulating layer  11  located on the lowermost side in the figure corresponds to the first side surface  15 , and the insulating layer  11  located on the uppermost side corresponds to the second side surface  16 . 
     The coil  20  has a helical structure in which the coil is wound while proceeding along an axis such that the axis is parallel to the bottom surface  17  of the element body  10  and intersects with the first side surface  15  and the second side surface  16  of the element body  10 . The axis of the coil is parallel to the W direction. The coil  20  contains Ag. The coil  20  may contain a conductive material other than Ag (e.g., Cu, Au) or glass. 
     Although the coil  20  is formed in a substantially oval shape when viewed in an axial direction, the present disclosure is not limited to this shape. The shape of the coil  20  may be circular, elliptical, rectangular, or other polygonal shapes, for example. The axial direction of the coil  20  refers to a direction parallel to the central axis of the helix formed by winding the coil  20 . The axial direction of the coil  20  and the lamination direction of the insulating layers  11  are the same direction. As used herein, the term “parallel” refers not only to a strictly parallel relationship but also to a substantially parallel relationship in consideration of a realistic variation range. 
     The coil  20  includes multiple coil wirings  21  each wound along a plane and via wirings  26  connecting the multiple coil wirings  21 . The multiple coil wirings  21  are laminated along the axial direction. The coil wirings  21  are formed by being wound on principal surfaces (L-T planes) of the insulating layers  11  orthogonal to the axial direction. The number of turns of the coil wiring  21  is less than one lap or may be one lap or more. The via wirings  26  penetrate the insulating layers  11  in the thickness direction (W direction). The coil wirings  21  adjacent to each other in the lamination direction are electrically connected in series via the via wirings  26 . In this way, the multiple coil wirings  21  form a helix while being electrically connected in series to each other. However, all the coil wirings  21  are not required to be electrically connected in series, and some or all of the coil wirings  21  may be electrically connected in parallel. 
     The coil wiring  21  has a wiring part  211  extending along a plane and a pad part  212  disposed at an end portion of the wiring part  211  and connected to the via wiring  26 . A portion of the pad part  212  protrudes to the inside of the coil  20  relative to the wiring part  211  when viewed in the axial direction. As shown in  FIG. 4 , these pad parts  212  do not protrude to the outside of the coil  20  relative to the wiring part  211  when viewed in the axial direction, and the pad part  212  and the wiring part  211  are substantially flush with each other for a tip on the outside of the coil  20 . The pad part  212  is circular. The diameter of the pad part  212  is larger than a width dimension h of the wiring part  211 . The width dimension h of the wiring part  211  is a dimension in the width direction orthogonal to the extending direction of the wiring part  211  when viewed in the axial direction. 
       FIG. 5  is a simplified view of  FIG. 4 . As shown in  FIG. 5 , between a first coil wiring  21 A and a second coil wiring  21 B adjacent to each other in the axial direction (W direction), the first coil wiring  21 A is located on the central side in the axial direction of the coil  20  relative to the second coil wiring  21 B. The center in the axial direction of the coil  20  refers to the center of the length in the axial direction of the coil  20  and corresponds to the position of the via wiring  26  shown in  FIG. 5  in the W direction. 
     In  FIG. 5 , among all the coil wirings  21 , the coil wirings  21  corresponding to the center in the axial direction of the coil  20  refer to the first coil wiring  21 A and a third coil wiring  21 C on both sides of the via wiring  26  actually located in the center in the axial direction. This is because the number of layers of the coil wirings  21  is twelve, which an even number, so that two layers of the coil wirings  21  corresponding to the center in the axial direction exist. On the other hand, when the number of layers of the coil wiring  21  is an odd number, the coil wiring  21  corresponding to the center in the axial direction is one layer, and the coil wiring  21  practically corresponds to the center of the length in the axial direction of the coil  20 . 
     A first pad part  212 A of the first coil wiring  21 A is adjacent to a second wiring part  211 B of the second coil wiring  21 B in the axial direction. When viewed in the axial direction that is the W direction of  FIG. 5 , a protrusion amount e of the first pad part  212 A from the second wiring part  211 B to the inside of the coil  20  is 1.4 times or less of the width dimension h of the second wiring part  211 B. The protrusion amount e of the first pad part  212 A refers to the maximum value of the protrusion of the first pad part  212 A from the second wiring part  211 B when viewed in the axial direction in terms of the portion of the second wiring part  211 B adjacent to the first pad part  212 A. 
     According to the configuration described above, since the protrusion amount e of the first pad part  212 A is 1.4 times or less of the width dimension h of the second wiring part  211 B, the magnetic flux flowing inside the coil  20  is less interfered with by the first pad part  212 A and the loss of the magnetic flux is reduced, so that the acquisition efficiency of the L value can be improved, and the decrease of the Q value can be suppressed. 
     Similarly, as shown in  FIG. 5 , between the third coil wiring  21 C and a fourth coil wiring  21 D, the third coil wiring  21 C is located on the central side in the axial direction of the coil  20  relative to the to the fourth coil wiring  21 D. The third coil wiring  21 C is connected to the first coil wiring  21 A via the via wiring  26  shown in the figure. A third pad part  212 C of the third coil wiring  21 C is adjacent to a fourth wiring part  211 D of the fourth coil wiring  21 D in the axial direction. When viewed in the axial direction, the protrusion amount e of the third pad part  212 C from the fourth wiring part  211 D to the inside of the coil  20  is 1.4 times or less of the width dimension h of the fourth wiring part  211 D. 
     According to the configuration described above, since the protrusion amount e of the third pad part  212 C is 1.4 times or less of the width dimension h of the fourth wiring part  211 D, the magnetic flux flowing inside the coil  20  is less interfered with by the third pad part  212 C and the loss of the magnetic flux is reduced, so that the acquisition efficiency of the L value can be improved, and the decrease of the Q value can be suppressed. 
     Similarly, among the other coil wirings  21  other than the first to fourth coil wirings  21 A to  21 D, the pad part of one coil wiring  21  located on the central side in the axial direction of the coil wirings  21  adjacent to each other in the axial direction is adjacent to the wiring part of the other coil wiring  21  in the axial direction and, when viewed in the axial direction, the protrusion amount e of the pad part  212  of the one coil wiring  21  from the wiring part  211  of the other coil wiring  21  to the inside of the coil  20  is 1.4 times or less of the width dimension h of the wiring part  211  of the other coil wiring  21 . 
     Although at least one pad part  212  of all the pad parts  212  may satisfy the above relationship, it is effective due to the magnetic flux density that the pad part  212  near the center in the axial direction of the coil  20  satisfies the relationship, and the pad parts  212  near both end sides in the axial direction of the coil  20  may not necessarily satisfy the relationship. It is preferable that a half or more of all the pad parts  212  satisfy the relationship, and it is more preferable that 80% or more of the pad parts  212  satisfy the relationship. Unless otherwise specified, the same applies to the subsequent features of the pad parts  212 . 
     Hereinafter, when the first coil wiring  21 A and the second coil wiring  21 B will be described, the same applies to the other coil wirings  211 , and therefore, the description thereof will not be made. 
     Preferably, the inductor component  1  has a size of less than 0.7 mm in a direction parallel to the bottom surface  17  and perpendicular to the axis of the coil, and a size of less than 0.4 mm in a direction parallel to the axis of the coil. For example, the size of the inductor component (L direction×W direction×T direction) is 0.6 mm×0.3 mm×0.3 mm, 0.4 mm×0.2 mm×0.2 mm, or 0.25 mm×0.125 mm×0.120 mm. The lengths in the W direction and the T direction may not be equal, and may be, for example, 0.4 mm×0.2 mm×0.3 mm. According to the configuration, even if the inductor component  1  is reduced in size, the interference with the magnetic flux of the coil  20  can effectively be reduced. 
     In this case, the protrusion amount e of the first pad part  212 A is preferably 21 μm or less. According to the configuration described above, the magnetic flux is hardly blocked by the pad part  212 A. For example, the width dimension h of the wiring part  211  is 15 μm, and the diameter of the pad part  212 A is 36 μm. Therefore, in this case, the center in the width direction of the wiring part  211  and the center of the pad part  212 A are not coincident with each other, and the center of the pad part  212 A is located inside the coil  20  by 3 μm from the center of the wiring part  211 . In this case, the protrusion amount e of the first pad part  212 A is 1.4 times of the width dimension h of the wiring part  211 . At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
     Modifications of the inductor component  1  will hereinafter be described with reference to the drawings. Portions not specifically described are the same as the configurations described above.  FIG. 6  is a cross-sectional view showing another shape of the via wiring. As shown in  FIG. 6 , a first length R 1  of a via wiring  26 A in the extending direction of the coil wiring  21  is longer than a second length R 2  of the via wiring  26 A in the width direction of the coil wiring  21 . Specifically, the coil wiring  21  in contact with the via wiring  26 A has a contact portion in contact with the via wiring  26 A, and the first length R 1  is the dimension in the extending direction (L direction of  FIG. 6 ) of the contact portion, and the second length R 2  is the length in the width direction (T direction of  FIG. 6 ) of the contact portion. The via wiring  26 A is elliptical or may be rectangular, oval, etc. According to the configuration described above, even when the protrusion amount e of the pad part  212  is limited, the first length R 1  of the via wiring  26 A in the extending direction of the contact portion of the coil wiring  21  having less limitation can be made longer to ensure the contact area of the via wiring  26 A for the coil wiring  21  (i.e., the cross-sectional area of the via wiring  26 A), and the connection reliability of the via wiring  26 A for the coil wiring  21  can be ensured. 
       FIG. 7  is a cross-sectional view showing another shape of the pad part. The pad part shown in  FIG. 7  is different in position and size from the pad part shown in  FIG. 5 . This different configuration will be described below. As shown in  FIG. 7 , the center of the first pad part  212 A is located at the center in the width direction of the second wiring part  211 B when viewed in the axial direction (W direction). Therefore, the first pad part  212 A protrudes not only to the inside but also to the outside of the coil  20  relative to the wiring part  211 B when viewed in the axial direction. According to the configuration described above, the magnetic flux is hardly blocked by the pad part  212 A. The radius of the first pad part  212 A is larger than that of  FIG. 5  and is 21 μm, for example. Even in this case, if the width dimension h of the wiring part  211  is equivalent, for example, 15 μm, the protrusion amount e of the first pad part  212 A to the inside of the coil  20  can be reduced to 13.5 μm and can be suppressed to 0.9 times of the width dimension h of the wiring part  211 . Therefore, while the magnetic flux is hardly blocked by the pad part  212 A, the contact area of the via wiring  26 A for the coil wiring  21  can be ensured. At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
       FIG. 8  is a cross-sectional view showing another shape of the wiring part. The wiring part shown in  FIG. 8  is different in size from the wiring part shown in  FIG. 5 . This different configuration will be described below. As shown in  FIG. 8 , when viewed in the axial direction, the width dimension h of the wiring part  211  is equal to the radius r of the first pad part  212 A, and is 18 μm or less, for example. Therefore, similarly to  FIG. 5 , when the first pad part  212 A and the wiring part  211 B are substantially flush with each other for the tip on the outside of the coil  20 , the protrusion amount e of the first pad part  212 A can be reduced to 18 μm or less and can be suppressed to 1.0 time of the width dimension h of the wiring part  211 . According to the configuration described above, while the magnetic flux is hardly blocked by the pad part  212 A, and the DC electric resistance can be reduced by making the wiring part  211  thicker. At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
       FIG. 9  is a cross-sectional view showing another shape of the pad part. The pad part shown in  FIG. 9  is different in position from the pad part shown in  FIG. 5 . This different configuration will be described below. As shown in  FIG. 9 , the center of the first pad part  212 A is located at the center in the width direction of the second wiring part  211 B when viewed in the axial direction. In this case, even if the width dimension h of the wiring part  211  and the radius r of the first pad part  212 A are equivalent to those in  FIG. 5 , for example, 15 μm and 18 μm, respectively, the protrusion amount e of the first pad part  212 A can be reduced to 10.5 μm and can be suppressed to 0.7 times of the width dimension h of the wiring part  211 . Although the protrusion amount e of the first pad part  212 A has been defined by the relative value with the width dimension h of the wiring part  211  in the above description, the protrusion amount e of the first pad part  212 A is more preferably 10.5 μm or less as shown in  FIG. 9  regardless of the width dimension h. According to the configuration described above, the magnetic flux is hardly blocked by the pad part  212 A. At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
       FIG. 10  is a cross-sectional view showing another shape of the pad part. The pad part shown in  FIG. 10  is different in size from the pad part shown in  FIG. 9 . This different configuration will be described below. As shown in  FIG. 10 , although the width dimension h of the wiring part  211  is equivalent to that of  FIG. 5 , for example, 15 μm when viewed in the axial direction, the radius r of the first pad part  212 A is smaller than that of  FIG. 9 , for example, 17 μm. In this case, the protrusion amount e of the first pad part  212 A can be reduced to 9.5 μm and can be suppressed to about 0.63 times of the width dimension h of the wiring part  211 . According to the configuration described above, the magnetic flux is hardly blocked by the pad part  212 A. At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
       FIG. 11  is a cross-sectional view showing another shape of the pad part. The pad part shown in  FIG. 11  is different in size from the pad part shown in  FIG. 7 . This different configuration will be described below. As shown in  FIG. 11 , a diameter D of the first pad part  212 A is equal to the width dimension h of the second wiring part  211 B when viewed in the axial direction. In this case, the position of the first pad part  212 A is the same as that of  FIG. 7 . Therefore, the first pad part  212 A does not project from the wiring part  211 B to the inside or the outside of the coil  20  when viewed in the axial direction. According to the configuration described above, the magnetic flux is hardly blocked by the pad part  212 A. At least one pad part  212  of all the pad parts  212  may satisfy the relationship described above. 
     The respective magnetic field strengths according to the examples in the structures of  FIGS. 5, 7, 10, and 11  will be described. 
     In the example with the structure of  FIG. 5 , the width dimension h of the wiring part  211  is 15 μm, and the radius r of the first pad part  212 A is 18 μm. Therefore, the protrusion amount e of the first pad part  212 A in this example is 21 μm, which is 1.4 times of the width dimension h of the second wiring part  211 B. 
     In the example with the structure of  FIG. 7 , the width dimension h of the wiring part  211  is 15 μm, and the radius r of the first pad part  212 A is 21 μm. Therefore, the protrusion amount e of the first pad part  212 A in this example is 13.5 μm, which is 0.9 times of the width dimension h of the second wiring part  211 B. In the example with the structure of  FIG. 10 , the width dimension h of the wiring part  211  is 15 μm, and the radius r of the first pad part  212 A is 17 μm. Therefore, the protrusion amount e of the first pad part  212 A in this embodiment was 9.5 μm, which is about 0.63 times of the width dimension h of the second wiring part  211 B. 
     In the example with the structure of  FIG. 11 , the width dimension h of the wiring part  211  is 15 μm, and the radius r of the first pad part  212 A is 15 μm. Therefore, the protrusion amount e of the first pad part  212 A in this example was 0 μm, which is 0 times of the width dimension h of the second wiring part  211 B. 
       FIG. 12A  is a schematic view of the magnetic field strength of  FIG. 7 ,  FIG. 12B  is a schematic view of the magnetic field strength in the example of  FIG. 10 , and  FIG. 12C  is a schematic view of the magnetic field strength in the example of  FIG. 11 .  FIG. 12D  is a schematic view of the magnetic field strength of a comparative example. 
     In the comparative example with the structure of  FIG. 12D , the width dimension h of the wiring part  211  is 15 μm, the radius of the first pad part  212 A is 21 μm and, as in  FIG. 5 , the first pad part  212 A and the wiring part  211 B are substantially flush with each other for the tip on the outside of the coil  20 . Therefore, the protrusion amount e of the first pad part  212 A is 1.8 times of the width dimension h of the second wiring part  211 B, and the protrusion amount e of the first pad part  212 A is 27 μm. 
     As shown in  FIGS. 12A, 12B, and 12C , the magnetic flux is less interfered with by the pad part  212 A in the order of  FIGS. 12A, 12B, and 12C . On the other hand, in  FIG. 12D , the flow of magnetic flux is significantly interfered with by the pad part  212 A. 
     Changes in the Q value of the examples and comparative example of  FIGS. 5, 7, 10, and 11  will be described. 
       FIG. 13A  is a graph showing a relationship between the frequency and the Q value. In  FIG. 13A , the graph of the example of  FIG. 5  is indicated by a solid line L 1 , the graph of  FIG. 7  is indicated by a dashed-two dotted line L 2 , the graph of  FIG. 10  is indicated by a dashed-dotted line L 3 , the graph of  FIG. 11  is indicated by a dotted line L 4 , and the graph of the comparative example is indicated by a dashed-three dotted line L 0 . As shown in  FIG. 13 , the Q value is improved in the order of L 1 , L 2 , L 3 , and L 4 , and the Q value of L 0  is the lowest. 
       FIG. 13B  shows the Q values at a frequency of 1000 MHz in the examples of  FIGS. 5  (graph L 1 ),  7  (graph L 2 ),  10  (graph L 3 ), and  11  (graph L 4 ) represented as a relative value to the Q value at a frequency of 1000 MHz in the comparative example (graph L 0 ). As shown in  FIG. 13B , it can be seen that the Q value is improved by about 7% in L 1 , about 10% in L 2 , and about 14% in L 3  and L 4 , as compared with the comparative example. As shown in  FIG. 13B , it can be seen that when the protrusion amount is 9.5 μm or less, the effect of improving the Q value is sufficiently obtained, which is particularly preferable. 
     Second Embodiment 
       FIG. 14  is a cross-sectional view showing a second embodiment of the inductor component. The second embodiment is different in the inner diameter of the coil from the first embodiment. This different configuration will be described below. The other configurations are the same as those of the first embodiment and will not be described. In  FIG. 14 , the pad parts are omitted for convenience. 
     As shown in  FIG. 14 , in an inductor component  1 A of the second embodiment, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. Although the inner diameter of the coil  20  increases continuously, the inner diameter may increase stepwise. The width dimension h of the wiring parts  211  of all the coil wirings  21  is the same. Therefore, the outer diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
     According to the configuration described above, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends, so that the flow of the magnetic flux is less interfered with at both ends of the coil  20 . Therefore, the inner surface of the coil  20  has a shape along the flow of the magnetic flux. As a result, the loss at both ends of the coil  20  can be reduced, and the decrease of the Q value can be suppressed. 
       FIG. 15  is a schematic view of the magnetic field strength of  FIG. 14 .  FIG. 15  shows the magnetic field strength in an end portion on the first side surface  15  side and the top surface  18  side of the coil  20 . As shown in  FIG. 15 , in the end portion of the coil  20 , the inner surface of the coil wiring  21  is arranged along the flow of the magnetic flux, so that the flow of the magnetic flux is smooth. 
       FIG. 16A  is a cross-sectional view showing another shape of the inductor component  1 A of  FIG. 14 . As shown in  FIG. 16A , the inner diameter of the coil wiring  21  at both ends in the axial direction of the coil  20  is larger than the inner diameter of the other coil wirings  21 . The inner diameters of the other coil wirings  21  are all the same. In the other coil wirings  21 , the inner diameter of some wirings may be different from the inner diameter of the other wirings, and as shown in  FIG. 16B , only the four layers of the coil wirings  21  near the center in the axial direction of the coil  20  may have the same inner diameter. Also in this case, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
       FIG. 17A  is a cross-sectional view showing another shape of the inductor component  1 A of  FIG. 14 . As shown in  FIG. 17A , the inner diameters of the two layers of the coil wirings  21  near the center in the axial direction of the coil  20  are smaller than the inner diameters of the other coil wirings  21 . The inner diameters of the other coil wirings  21  are all the same. In the other coil wirings  21 , the inner diameter of some wirings may be different from the inner diameter of the other wirings, and as shown in  FIG. 17B , only the two layers of the coil wirings  21  near each of both ends in the axial direction of the coil  20  may have the same inner diameter. Also in this case, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
       FIG. 18  is a cross-sectional view showing another shape of the inductor component  1 A of  FIG. 14 . In the inductor component  1 B shown in  FIG. 18 , the outer diameters of all the coil wirings  21  are the same as compared to those of the inductor component  1 A of  FIG. 14 . Therefore, the width dimension h of the wiring part  211  of the coil wiring  21  decreases from the center in the axial direction of the coil  20  toward both ends. Also in this case, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
       FIG. 19A  is a cross-sectional view showing another shape of the inductor component  1 B of  FIG. 18 . As shown in  FIG. 19A , the inner diameters of the coil wirings  21  at both ends in the axial direction of the coil  20  are larger than the inner diameter of the other coil wirings  21 . The inner diameters of the other coil wirings  21  are all the same. In the other coil wiring  21 , the inner diameter of some wirings may be different from the inner diameter of the other wirings, and as shown in  FIG. 19B , only the four layers of the coil wirings  21  near the center in the axial direction of the coil  20  may have the same inner diameter. Also in this case, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
       FIG. 20A  is a cross-sectional view showing another shape of the inductor component  1 B of  FIG. 18 . As shown in  FIG. 20A , the inner diameters of the two layers of the coil wirings  21  near the center in the axial direction of the coil  20  are smaller than the inner diameters of the other coil wirings  21 . The inner diameters of the other coil wirings  21  are all the same. In the other coil wiring  21 , the inner diameter of some wirings may be different from the inner diameter of the other wirings, and as shown in  FIG. 20B , only the two layers of the coil wirings  21  near each of both ends in the axial direction of the coil  20  may have the same inner diameter. Also in this case, the inner diameter of the coil  20  increases from the center in the axial direction of the coil  20  toward both ends. 
     As shown in  FIG. 14 , in at least two coil wirings  21  of all the coil wirings  21 , the inner diameter of one coil wiring  21  of the two coil wirings  21  adjacent to each other in the axial direction is larger than the inner diameter of the other coil wiring  21 , and when viewed in the axial direction, a deviation width F between the inner surface of the one coil wiring  21  and the inner surface of the other coil wiring  21  is preferably 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm). The inner diameter of the coil wiring  21  refers to the inner diameter of the wiring part  211  of the coil wiring  21 . The inner surface of the coil wiring  21  refers to the inner surface of the wiring part  211  of the coil wiring  21 . 
     According to the configuration described above, the deviation width F between the inner surface of the one coil wiring  21  and the inner surface of the other coil wiring  21  is 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm), so that the inner surface of the coil wiring  21  can easily be arranged along the magnetic flux, and the flow of the magnetic flux is hardly interfered with on the inner surface of the coil wiring  21 . On the other hand, in the case of 4 μm or more, the flow of the magnetic flux is easily interfered with on the inner surface of the coil wiring  21 , and in the case of 1 μm or less, the inner surface of the coil wiring  21  becomes difficult to arrange along the magnetic flux. 
     More preferably, in all the coil wirings  21 , the inner diameter of the one coil wiring  21  is larger than the inner diameter of the other coil wiring  21 , and when viewed in the axial direction, the deviation width F between the inner surface of the one coil wiring  21  and the inner surface of the other coil wiring  21  is 1 μm or more and 4 μm or less (i.e., from 1 μm to 4 μm). According to the configuration described above, the inner surfaces of all the coil wirings  21  are easily arranged along the magnetic flux, and the flow of the magnetic flux is hardly interfered with on the inner surfaces of the coil wirings  21 . 
     The deviation width F may not be constant along the extending direction of the same coil wiring  21 . For example, as shown in  FIG. 21 , the coil wiring  21  has a first portion  21   a  extending in the direction (T direction) intersecting with the top surface  18  and the bottom surface  17 , and a second portion  21   b  extending in the direction (L direction) intersecting with the first end surface  13  and the second end surface  14 . A first deviation width F 1  in the L direction of the first portion  21   a  is larger than a second deviation width ε 2  in the T direction of the second portion  21   b.    
     According to the configuration described above, since the size of the element body  10  in the L direction is usually larger than the size of the element body  10  in the T direction, the element body  10  has a margin in the space for extending the second portion  21   b  of the coil wiring  21  as compared to the space for extending the first portion  21   a  of the coil wiring  21 . Therefore, the first deviation width ε 1  in the L direction of the first portion  21   a  of the coil wiring  21  can be made larger. 
     The first deviation width ε 1  may be smaller than the second deviation width F 2 . The deviation width ε of the coil wiring  21  of each layer may not be constant. Specifically, for example, the deviation width ε between the coil wiring  21  of the first layer and the coil wiring  21  of the second layer may be 4 μm, and the deviation width ε between the coil wiring  21  of the second layer and the coil wiring  21  of the third layer may be 3 μm. 
     The deviation width ε is preferably symmetrical with respect to the center in the axial direction of the coil  20 . For example, when five layers of the coil wirings  21  are included, the deviation width ε between the coil wiring  21  of the first layer and the coil wiring  21  of the second layer is 4 μm, the deviation width ε between the coil wiring  21  of the second layer and the coil wiring of the third layer is 3 μm, the deviation width ε between the coil wiring  21  of the third layer and the coil wiring  21  of the fourth layer is 3 μm, and the deviation width ε between the coil wiring  21  of the fourth layer and the coil wiring  21  of the fifth layer is 4 μm. 
     Third Embodiment 
       FIG. 22  is a cross-sectional view showing a third embodiment of the inductor component. The third embodiment is different from the second embodiment in that the pad part is drawn. This different configuration will be described below. The other configurations are the same as those of the second embodiment and will not be described. In the third embodiment, the same reference numerals as those in the first embodiment denote the names of the same members as in the first embodiment. 
     As shown in  FIG. 22 , in an inductor component  1 C of the third embodiment, the width dimension h of the wiring parts  211  of all the coil wirings  21  is the same. The first coil wiring  21 A corresponds to a portion having a small inner diameter of the coil  20 . When viewed in the axial direction, a first protrusion amount e 1  from the second wiring part  211 B of the first pad part  212 A to the outside of the coil  20  is greater than or equal to a second protrusion amount e 2  from the second wiring part  211 B of the first pad part  212 A to the inside of the coil  20 . 
     According to the configuration described above, a side gap on the radial outside of the first coil wiring  21 A is wider than a side gap on the radial outside of the coil wiring  21  corresponding to a portion having a large inner diameter of the coil  20  (i.e., located on the outer side in the axial direction of the coil  20 ), and therefore, even if the first pad part  212 A is shifted to the side gap on the outside of the first coil wiring  21 A, the constant side gap can be ensured on the radial outside of the entire coil. Since the side gap can be ensured in this way, it is not necessary to reduce the diameter of the coil  20  or increase the size of the element body  10 . 
     Additionally, by simply shifting the first pad part  212 A to the side gap on the outside of the first coil wiring  21 A, the second protrusion amount e 2  of the first pad part  212 A to the inside of the coil  20  can easily be reduced, and furthermore, the cross-sectional area of the first pad part  212 A and the cross-sectional area of the via wiring  26  can be ensured, so that the connection reliability of the via wiring  26  for the coil wiring  21  can be ensured. 
     More preferably, the first coil wiring  21 A corresponds to a portion having the smallest inner diameter of the coil  20 . According to the configuration described above, the side gap on the radial outside of the first coil wiring  21 A is the widest among the side gaps on the outside of the entire coil. Therefore, even if the first pad part  212 A is shifted to the side gap on the outside of the first coil wiring  21 A, the side gap on the outside of the entire coil can more reliably be ensured. 
     Although the first coil wiring  21 A and the second coil wiring  21 B have been described, the same applies to the third coil wiring  21 C (third pad part  212 C), the fourth coil wiring  21 D (fourth wiring part  211 D), and the other coil wirings  21 , and therefore, the description thereof will not be made. 
     Preferably, the first pad part  212 A is located on the top surface  18  side relative to the bottom surface  17  side. According to the configuration described above, even if the first pad part  212 A is shifted to the side gap on the outside of the first coil wiring  21 A on the top surface  18  side, the side gap on the outside of the entire coil can be ensured. Specifically, although it is difficult to ensure the side gap on the outside of the coil on the top surface  18  side as compared to the bottom surface  17  side since the L-shaped external electrodes  30 ,  40  do not exist, the side gap on the outside of the coil can be ensured on the top surface  18  side by achieving the configuration described above. 
       FIG. 23  is a perspective front view showing a preferable form of the inductor component  1 C. In  FIG. 23 , although the inner diameter of the coil  20  actually increases from the center in the axial direction toward both ends as shown in  FIG. 22 , the coil  20  is drawn to have the same inner diameter along the axial direction for convenience. 
     As shown in  FIG. 23 , in the coil wirings  21  located on the outer side in the axial direction among all the coil wirings  21 , the pad part  212  is located on the bottom surface  17  side relative to an end edge on the top surface  18  side of the first external electrode  30  and an end edge on the top surface  18  side of the second external electrode  40  when viewed in the axial direction (W direction). Therefore, the pad parts  212  of the coil wirings  21  located on the outer side in the axial direction are located on the bottom surface  17  side relative to a virtual plane S in contact with the end edge on the top surface  18  side of the first external electrode  30  and the end edge on the top surface  18  side of the second external electrode  40  when viewed in the axial direction. 
     Referring to  FIG. 2 , the coil wirings  21  located on the outer side in the axial direction refer to the coil wirings  21  from the bottom to the fourth layer and the coil wirings  21  from the top to the fourth layer of the 12 layers of the coil wirings  21 . Therefore, the coil wirings  21  located on the outer side in the axial direction refer to the coil wirings  21  in the upper and lower ⅓ of the layers of all the coil wirings  21 . 
     Obviously, the pad part  212  of the coil wiring  21  located on the outermost side in the axial direction is located on the bottom surface  17  side relative to the end edge on the top surface  18  side of the first external electrode  30  and the end edge on the top surface  18  side of the second external electrode  30  when viewed in the axial direction. 
     According to the configuration described above, although the inner diameter of the coil wirings  21  located on the outer side in the axial direction becomes large, the pad part  212  is located on the bottom surface  17  side relative to the end edge on the top surface  18  side of the first external electrode  30  and the end edge on the top surface  18  side of the second external electrode  30 , so that even if the protrusion of the pad part  212  is shifted to the outside of the coil  20 , an influence on the side gap of the entire coil is small, and the protrusion of the pad part  212  to the inside of the coil  20  can effectively be reduced. 
     The present disclosure is not limited to the embodiments described above and may be changed in design without departing from the spirit of the present disclosure. For example, respective feature points of the first to third embodiments may variously be combined. 
     In the embodiments, the first and second external electrodes are L-shaped; however, the external electrodes may be five-sided electrodes, for example. Therefore, the first external electrode may be disposed on the entire first end surface and a portion of each of the first side surface, the second side surface, the bottom surface, and the top surface, and the second external electrode may be disposed on the entire second end surface and a portion of each of the first side surface, the second side surface, the bottom surface, and the top surface. Alternatively, the first external electrode and the second external electrode may each be disposed on a portion of the bottom surface.