JP2019186523A - Surface-mount inductor - Google Patents

Abstract

To provide a surface-mount inductor capable of improving resistance reduction and reliability.SOLUTION: A surface-mount inductor includes a coil having a winding part where a winding conductor is wound, and a lead-out part to be led out from the outer boundary of the winding part, a compact containing metal magnetic powder, and embedding the coil, and an external terminal formed in the compact and for connection with the lead-out part. The compact includes a pair of principal surfaces facing each other, a pair of end faces adjacent to the pair of principal surfaces and facing each other, and lateral faces adjacent to the pair of principal surfaces and the pair of end faces, and facing each other, and has a high region located at a relatively high position by making one principal surface the component side, and forming a recess in the component side, and a low region located at a relatively low position, the winding part of the coil is embedded in the compact so that the winding shaft will be in parallel with the component side of the compact, the lead-out part of the coil is led out toward the component side from winding part, and placed to be exposed in the low region of the component side, and is connected with the external terminal in the low region.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a surface mount inductor, and more particularly to a surface mount inductor in which at least one coil is embedded in a molded body.

  As a surface mount inductor used for a power inductor, for example, a surface mount inductor in which a coil formed by winding a conductive wire around a molded body containing magnetic powder is used. As the surface-mount inductor, for example, a coil having a winding part formed by winding so that both ends of the conducting wire are positioned on the outer periphery and a drawing part drawn from the outer periphery of the winding part is used. The end of the lead is pulled out to the side of the molded body, and the end of the drawer is connected to the external terminals formed on the side surface of the molded body and the mounting surface adjacent to the side (for example, Patent Literature 1).

JP 2009-267350 A

  In recent years, as electronic devices have become smaller and lighter, power inductors used in power circuits are also required to be smaller and lighter. Therefore, what is called a large current that can flow is demanded. However, in the conventional surface mount inductor, the end portion of the coil lead-out portion is drawn out to the side surface of the molded body and connected to the external terminal on the side surface of the molded body. Therefore, a current path from the connection portion of the external terminal with the coil lead-out portion to the mounting surface of the molded body is required. As a result, the current path becomes longer, the electric resistance at the external terminal increases, and there is a problem that it is difficult to reduce the resistance to cope with a large current. Also, if the end of the coil lead is exposed to the mounting surface of the molded body, the processing of the end of the coil lead becomes complicated, so the strength of the end of the lead decreases and the quality There is also a problem that the reliability of the product is lowered due to the variation of the product.

  Therefore, an object of the present invention is to provide a surface mount inductor capable of reducing resistance and improving reliability.

  In order to solve the above-described problem, a surface-mount inductor according to an aspect of the present invention includes a winding portion in which a conductive wire is wound so that both ends thereof are positioned on the outer periphery, and a coil having a lead-out portion that is drawn from the outer periphery of the winding portion And a molded body in which the coil is embedded, and an external terminal formed in the molded body and connected to the lead-out portion, the molded body is adjacent to the pair of principal surfaces and the pair of principal surfaces. , A pair of end surfaces facing each other, a pair of main surfaces and the side surfaces adjacent to the pair of end surfaces and facing each other, wherein one of the main surfaces is a mounting surface, and a recess is formed on the front mounting surface. By forming, the coil has a high region located at a relatively high position and a low region located at a relatively low position, and the coil has a winding axis of the winding portion and a recess on the mounting surface of the molded body. It is embedded in the molded body so that it is parallel, and the pair of drawers is the outer periphery of the winding part. Drawn on the mounting surface side are arranged so as to be exposed respectively at lower mounting surface region and is connected to the external terminals of the pair in the lower region.

  According to the above aspect, since the distance between the coil lead-out portion and the portion of the external terminal mounted on the substrate can be shortened, the electrical resistance at the external terminal can be reduced, and the end of the coil lead-out portion is complicated. Therefore, it is possible to improve reliability.

  In another aspect, the mounting surface has a region connecting the high region and the low region, and the lead portion extends so as to be exposed in the high region, the region connecting the low region, and the low region. ing.

  According to said aspect, while being able to reduce the electrical resistance in the connection part of the drawer | drawing-out part of a coil and an external terminal, the adhering strength between an extraction | drawer part and an external terminal, and between an external terminal and a molded object The fixing strength of can be improved.

  In another aspect, the molded body has an end surface adjacent to the mounting surface, and the external terminal is disposed so as to extend from the low region to the end surface.

  According to said aspect, the adhering strength between a molded object and an external terminal can further be improved.

  Moreover, in another aspect, the drawer | drawing-out part is exposed also to the end surface of a molded object, and the drawer | drawing-out part is connected with the external terminal also at the end surface of a molded object.

  According to the above aspect, since the joint area between the coil lead portion and the external terminal is increased, the electrical resistance at the connection portion between the coil lead portion and the external terminal can be further reduced, and the lead portion and the external terminal can be reduced. The fixing strength between the two can be improved.

  In another aspect, the external terminal extends along the region connecting the high region and the low region and the low region.

  According to said aspect, the adhering strength between a molded object and an external terminal can further be improved.

  In another aspect, when the direction in which the pair of end faces face each other is L direction, the length in the L direction of the leading portion in the low region is L1, and the length in the L direction of the external terminal in the low region is L2. , L1 and L2 are the same.

  According to said aspect, the electrical resistance in the connection part between an extraction | drawer part and an external terminal can be reduced more by increasing the junction area of an extraction | drawer part and an external terminal.

  In another aspect, when the direction in which the pair of end faces face each other is L direction, the length in the L direction of the leading portion in the low region is L1, and the length in the L direction of the external terminal in the low region is L2. , L2 is greater than L1.

  According to said aspect, the joining area of an external terminal and a molded object can be increased, and the adhering strength of an external terminal and a molded object can be improved.

  According to the present invention, it is possible to provide a surface mount inductor capable of reducing resistance and improving reliability.

FIG. 3 is a schematic transparent perspective view showing the surface-mount inductor according to the first embodiment. FIG. 2 is a schematic longitudinal sectional view of the surface mount inductor shown in FIG. 1. FIG. 3 is a partially schematic enlarged longitudinal sectional view of FIG. 2. FIG. 6 is a bottom view showing another example of the surface-mount inductor according to the first embodiment. FIG. 10 is a bottom view showing still another example of the surface-mount inductor according to the first embodiment. FIG. 4 is a schematic longitudinal sectional view of a surface mount inductor 2 according to a second embodiment. FIG. 7 is a partial schematic enlarged cross-sectional view of FIG. 6.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following drawings, when using the same member, the same code | symbol may be attached | subjected and the overlapping description may be abbreviate | omitted or simplified.

(Embodiment 1)
The surface-mount inductor according to the present embodiment includes a coil having a winding part in which a conducting wire is wound around a winding axis and a lead part drawn from the outer periphery of the winding part, and magnetic powder, and the coil is embedded. The molded body and an external terminal formed on the molded body are provided. The molded body is adjacent to the pair of main surfaces facing each other, the pair of main surfaces adjacent to each other, the pair of end surfaces facing each other, the pair of main surfaces and the pair of end surfaces being adjacent to each other, A high region located at a relatively high position and a low region located at a relatively low position by forming one of the main surfaces as a mounting surface and forming a recess in the mounting surface. It is formed. The coil is embedded in the molded body so that the winding axis of the winding part is parallel to the concave portion of the mounting surface of the molded body. The end portion of the lead-out portion drawn out from the coil winding portion to the mounting surface side is disposed so as to be exposed in a low region of the mounting surface, and is connected to an external terminal in the low region.

  FIG. 1 is a schematic transparent perspective view showing a surface mount inductor 1 according to the present embodiment, as viewed from the mounting surface side. The surface-mount inductor 1 has a molded body 12 made of a sealing material containing magnetic powder and resin, in which one coil 11 around which a conductive wire is wound is embedded. FIG. 1 shows an example in which the molded body 12 is a rectangular parallelepiped. The molded body 12 has an upper surface 12a and a bottom surface as a pair of opposing main surfaces. Here, the bottom surface corresponds to the mounting surface 12b. The molded body 12 is adjacent to the upper surface 12a and the mounting surface 12b and is adjacent to the pair of end surfaces 12c and 12d, the upper surface 12a and the mounting surface 12b, and the pair of end surfaces 12c and 12, and is opposed to each other. It has a side. The coil 11 is an air-core coil, and both ends of the conductive wire are positioned on the outer periphery of the coil and connected to each other on the inner periphery, and the outer periphery of the winding portion 11a. And a pair of lead portions 11b and 11c drawn in opposite directions from each other. The coil 11 is embedded in the molded body 12 so that the winding axis A of the winding portion 11 a is parallel to the mounting surface 12 b of the molded body 12. A flat wire having a flat cross section can be used as the conducting wire.

  The mounting surface 12b of the molded body 12 is formed with a groove-like concave portion extending in parallel with the winding axis A of the winding portion of the coil 11, and is positioned at a relatively high position constituted by the bottom surface of the concave portion. A first region 121b, a second region 122b located at a relatively low position (at a position lower than the first region 121b) so as to sandwich the first region 121b on both sides of the first region 121b, and The third region 123b is connected to the first region 121b and the second region 122b, and the fourth region 124b configured by the side surface of the recess is connected to the first region 121b and the third region 123b. And a fifth region 125b constituted by the side surface of the recess. The fourth region 124b and the fifth region 125b are formed so as to be gently inclined between the first region 121b and the second region 122b and between the first region 121b and the third region 123b, respectively. Has been. One lead portion 11b extends from the outer periphery of the winding portion 11a through the molded body 12, and is bent so that the end portion is exposed in the second region 122b of the mounting surface 12b. The other lead portion 11c is also bent so that the inside of the molded body 12 extends from the outer periphery of the winding portion 11a and the end portion thereof is exposed in the third region 123b of the mounting surface 12b. Further, the lead portion 11 b exposed in the second region 122 b is connected to the first external terminal 13, and the lead portion 11 c exposed in the third region 123 b is connected to the second external terminal 14. Note that the fourth region 124b and the fifth region 125b may be vertically formed between the first region 121b, the second region 122b, and the third region 123b.

  FIG. 2 is a schematic longitudinal sectional view of the surface-mount inductor 1 shown in FIG. 1 and shows an example in which the mounting surface is down. FIG. 3 is a partial schematic enlarged cross-sectional view of FIG. 2, showing the relationship between the lead-out portion and the external terminals. The relationship between the lead portion and the external terminal will be described by taking the lead portion 11b as an example. The drawn portion 11b that is bent is drawn to the mounting surface 12b side, extends along the fourth region 124b, is exposed in the second region 122b, and the leading end surface 111b of the drawn portion 11b is mounted on the mounting surface. It arrange | positions so that it may expose to the end surface 12c adjacent to 12b. On the other hand, the first external terminal 13 extends in a L-shaped cross section from the second region 122b of the mounting surface 12b to a part of the end surface 12c adjacent to the mounting surface 12b. It is connected to the drawer 11b exposed at the end face 12c.

  The molded body 12 is formed of a sealing material containing magnetic powder and resin. Examples of magnetic powder include iron-based metal magnetic powder such as Fe, Fe-Si, Fe-Si-Cr, Fe-Si-Al, Fe-Ni-Al, and Fe-Cr-Al. , Metal magnetic powder of composition system not containing iron, metal magnetic powder of other composition system containing iron, metal magnetic powder in amorphous state, metal magnetic powder coated with an insulator such as glass, surface modification It is possible to use metallic magnetic powder, nano-level fine metallic magnetic powder, or the like, or a mixture thereof. In addition, as the resin, for example, a thermosetting resin such as an epoxy resin, a polyimide resin, or a phenol resin, a thermoplastic resin such as a polyethylene resin or a polyamide resin, or a mixture thereof may be used. it can. Moreover, the magnitude | size of the molded object 12 will not be specifically limited if it is a magnitude | size which can be used for surface mounting. For example, the size can be L (length) 2.5 mm × W (width) 2.0 mm × T (height) 2.0 mm. Further, when the size of the molded body 12 is L (length) 2.5 mm × W (width) 2.0 mm × T (height) 2.0 mm, the first region 121b, which is the depth of the recess, is changed from the first region 121b. The distance to the second region 122b or the third region 123b is, for example, 50 μm or more.

  The surface mount inductor according to the present embodiment can be manufactured using, for example, the following manufacturing method. A winding portion shown in FIG. 1 is formed by winding a conductor having a rectangular cross section with an insulating coating in a spiral shape with both ends positioned on opposite sides along the outer periphery and connected to each other on the inner periphery. 11a is formed. Next, both ends of the conducting wire are drawn out from the opposite sides of the outer periphery of the winding portion in the mounting surface side direction, bent in the opposite directions to form the drawn portions 11b and 11c, and the coil 11 is formed. The resin used for the insulating coating preferably has a high heat resistance temperature, and examples thereof include polyamide resins, polyester resins, and imide-modified polyurethane resins. The conducting wire may be a round wire with a circular cross section or a polygonal cross section.

  Next, the sealing material (henceforth material for moldings) which mixed metal magnetic powder and resin is manufactured. As metal magnetic powder, for example, iron-based metal magnetic powder such as Fe, Fe—Si—Cr, Fe—Si—Al, Fe—Ni—Al, Fe—Cr—Al, etc., and iron are not included. Metallic magnetic powder of composition system, metallic magnetic powder of other composition system including iron, amorphous metallic magnetic powder, metallic magnetic powder coated with an insulator such as glass, metallic magnetic powder with modified surface, Nano-level fine metal magnetic powder or the like is used. As the resin, for example, a thermosetting resin such as an epoxy resin, a polyimide resin, or a phenol resin, or a thermoplastic resin such as a polyethylene resin or a polyamide resin is used. Next, the coil 11 is formed in advance using the molding material, and includes a bottom portion, a winding shaft portion for inserting a winding portion provided on the bottom portion, and a winding shaft portion surrounding the winding portion. A preform having a wall portion provided and having a notch for pulling out the drawer portion on the wall portion is manufactured. Then, the coil is attached to the preform so that the drawn portion is along the outside of the wall portion of the preform. This is placed in a predetermined molding die in which a recess can be provided on the mounting surface so that the winding axis is parallel to the mounting surface of the molded body. Then, another preform is placed in the molding die, or a molding material is filled in the molding die, and these are compression-molded. As a result, as shown in FIG. 1, a molded body 12 is obtained in which the coil 11 is embedded and the mounting surface 12b is formed with a recess. Further, the molding method is not limited to such a compression molding method, and a powder molding method can also be used.

  Next, the resin component present on the surface of the part on which the external terminal of the mounting surface 12b of the molded body 12 is formed is removed using a resin removing means such as laser irradiation, blasting, and polishing. Thereby, a region where the metal magnetic powder is exposed is formed on the mounting surface 12 b of the molded body 12. Further, by using this resin removing means, the insulating coating on the ends of the lead portions 11b and 11c of the coil 11 is removed to expose the conducting wire.

  Further, the first external terminal 13 and the second external terminal are formed by performing plating on the molded body 12 and growing the plating on the region where the metal magnetic powder of the mounting surface 12b of the molded body 12 is exposed and the conductive wire. 14 is formed. As a result, the first external terminal 13 is connected to the drawer 11 b of the coil 11, and the second external terminal 14 is connected to the drawer 11 c of the coil 11. The first external terminal 13 and the second external terminal 14 are formed by forming a first plating layer of Cu on the region where the metal magnetic powder is exposed on the mounting surface 12b of the molded body 12 and the conductive wire, The second plating layer is formed of Ni, and the third plating layer is formed of Sn on the second plating layer. The conductive material used for the plating is not particularly limited as long as it is a conductor that can be plated. In addition to Cu, Ni, and Sn, a conductor such as silver or an alloy containing silver can be used. The order may be changed according to the characteristics. The first external terminal 13 and the second external terminal 14 may be formed of one layer, two layers, or three or more layers.

  According to the present embodiment, since the coil lead-out portion can be directly drawn out to the mounting surface and connected to the external terminal, the distance between the coil lead-out portion and the portion of the external terminal mounted on the substrate is smaller than the conventional case. Shorter. As a result, the resistance of the surface mount inductor can be reduced by reducing the electrical resistance at the external terminal. For example, the end portion of the coil lead-out portion is pulled out to the side surface of the molded body, the external terminal is formed on the side surface of the molded body and the mounting surface adjacent to the side surface, and the end portion of the coil lead-out portion is connected to this external terminal The direct current resistance of 6.15 mΩ in the surface mount inductor can be reduced to 4.88 mΩ in the inductor of the present embodiment. Further, according to the present embodiment, since the coil is embedded in the molded body so that the winding axis of the coil is parallel to the mounting surface of the molded body, when pulling out the end of the lead-out portion on the mounting surface The processing which greatly deforms the end portion of the drawer portion is not necessary. For example, when the coil is embedded in the molded body so that the winding axis of the coil is perpendicular to the mounting surface of the molded body as in the prior art, in order to pull out the drawer portion on the mounting surface, A complicated process for large deformation such as twisting or crushing is required. As a result, the mechanical strength of the drawer portion may be reduced and damaged, or quality may vary. According to the present embodiment, since it is not necessary to greatly deform the end portion of the drawer portion, it is possible to improve the reliability of the product. Further, by providing the concave portion on the mounting surface of the molded body, the side surface (the fourth region and the second region) of the concave portion located between the first region and the second and third regions can be obtained compared to the case where there is no concave portion. 5), the creepage distance between the first external terminal and the second external terminal can be increased, so that a short circuit between the external terminals can be suppressed. Thereby, the withstand voltage of the surface mount inductor can be improved. In addition, by providing a recess on the mounting surface of the molded body, even when the substrate is bent, it is possible to prevent the substrate from coming into direct contact with the mounting surface of the molded body, thereby reducing the effects of substrate bending and vibration. Thus, the reliability of the surface mount inductor can be improved. In addition, when a surface-mount inductor is temporarily fixed to a substrate using an adhesive and mounted, the concave portion can be used as a space to be filled with the adhesive, thereby improving the fixing strength between the mounting surface and the substrate. Thus, the reliability of the surface mount inductor can be further improved.

  In the present embodiment, the recess on the mounting surface is a groove formed in parallel with the winding axis of the coil, and the second region and the third region located at relatively low positions are relatively Although an example in which the first region is formed on both sides of the first region located at a high position is shown, the present invention is not limited to this. For example, one recess may be provided on the mounting surface, and a relatively low region may be provided so as to surround a relatively high region constituted by the bottom surface of the recess. The recess may be circular when viewed from above. The second region and the third region may have the same size (area on the mounting surface) or may be different.

  In the present embodiment, the leading end surface of the lead portion 11b of the coil 11 may not be exposed on the end surface 12c adjacent to the mounting surface 12b, but is adjacent to the mounting surface 12b as shown in FIGS. It is preferable to be disposed so as to be exposed at the end face 12c. Since the exposed area of the coil lead-out portion can be increased, the fixing strength between the coil lead-out portion and the external terminal can be improved, and the fixing strength between the external terminal and the molded body can also be improved.

  In this embodiment, the external terminals may be formed at least on the mounting surface. However, as shown in FIGS. 1 and 2, the external terminals extend from the mounting surface to the end surface adjacent to the mounting surface. It is preferable to have an L-shaped cross section. The adhesion strength between the external terminal and the molded body can be further increased. In addition, when the end of the coil lead-out portion is exposed on the end face, forming the external terminal in an L-shaped cross section can increase the bonding area between the lead-out portion and the external terminal. The resistance between the external terminals can be further reduced. When the external terminal has an L-shaped cross section, the height H1 of the portion extending to the end surface shown in FIG. 2 is 1 / of the molded body 12 and the height H0 from the viewpoint of fixing strength and low resistance. It is preferably 4 or more, more preferably 1/4 or more and 1/2 or less. In addition, when the lead-out end portion of the coil is exposed on the end surface, the length of the end surface portion of the external terminal is preferably the same as the length of the mounting surface portion.

  Further, as shown in FIG. 1, the molded body 12 is a pair of end surfaces that are in contact with the mounting surface 12b and face each other, and are arranged in a direction orthogonal to the winding axis A. have. As shown in FIGS. 2 and 3, the direction in which the pair of end faces 12c and 12d are opposed to each other is the L direction, the length in the L direction of the leading portion 11b in the second region 122b is L1, and the second region 122b. When the length of the first external terminal 13 in the L direction is L2, L1 and L2 may be the same. An example is shown in FIG. FIG. 4 is a bottom view showing an example of the structure of the surface-mount inductor 1 and shows the state of the mounting surface. The lengths of the lead portion 11b and the lead portion 11c in the L direction are the same as the lengths of the first external terminal 13 and the second external terminal 14 in the L direction, respectively. By increasing the joint area between the lead portion and the external terminal, the electrical resistance between the lead portion and the external terminal can be further reduced.

  On the other hand, as shown in FIG. 5, the lengths of the first external terminal 13 and the second external terminal 14 in the L direction may be made larger than the lengths of the lead portion 11b and the lead portion 11c in the L direction, respectively. it can. In this case, the adhesion strength between the molded body and the external terminal can be increased.

  4 and 5, the lengths in the L direction of the lead portion 11b and the lead portion 11c are the same, and the lengths in the L direction of the first external terminal and the second external terminal are the same. The lengths in the L direction of the lead portion 11b and the lead portion 11c may be different from each other, and the lengths in the L direction of the first external terminal and the second external terminal may be different from each other.

(Embodiment 2)
In the present embodiment, the mounting surface is the same as in the first embodiment, except that the lead portion of the coil extends so as to be exposed in the fourth and fifth regions and the second and third regions. It has the composition of.

  FIG. 6 is a schematic longitudinal sectional view of the surface-mount inductor 2 according to the present embodiment, and shows an example in which the mounting surface is directed downward. FIG. 7 is a partial schematic enlarged cross-sectional view of FIG. 6 and shows the relationship between the lead portion and the external terminal. The relationship between the lead portion and the external terminal will be described by taking the lead portion 11b as an example. The bent-out lead portion 11b is drawn out to the mounting surface 12b side and is disposed so as to be exposed to the fourth region 124b and the second region 122b. On the other hand, the first external terminal 13 extends from the fourth region 124b to the second region 122b and a part of the end surface 12c adjacent to the mounting surface 12b in an L-shaped cross section. 124b and the lead portion 11b exposed to the second region 122b.

  According to the present embodiment, the following effects are obtained by exposing the lead-out portion from the fourth region. When the molded body is molded, the coil is easily positioned in the molding die by positioning the coil in the molding die in accordance with the position of the recess provided in the molding die. It is possible to improve the positional accuracy of the end portion of the coil lead-out portion. Moreover, since the exposed area of the drawer portion can be increased by exposing the drawer portion from the fourth region, the fixing strength between the drawer portion and the external terminal can be further improved, and the external terminal and the drawer portion can be further improved. The electrical resistance between them can be further reduced. Further, the fixing strength between the external terminal and the molded body can be further improved. In addition, since the solder fillet is formed not only on the end face side of the external terminal but also on the concave side of the external terminal when mounted on the substrate, the fixing strength to the substrate can be further improved.

DESCRIPTION OF SYMBOLS 1 Surface mount inductor 2 Surface mount inductor 11 Coil 11a Winding part 11b Lead part 11c Lead part 111b Lead end surface 12 Molded body 12a Upper surface 12b Mounting surface 12c End surface 12d End surface 121b First area 122b Second area 123b Third area 124b 4th area | region 125b 5th area | region 13 1st external terminal 14 2nd external terminal

Claims (7)

A coil having a winding portion in which a conductive wire is wound so that both ends thereof are positioned on the outer periphery and a pair of lead portions drawn from the outer periphery of the winding portion, and metal magnetic powder are contained, and the coil is embedded A molded body and a pair of external terminals formed on the molded body and connected to the lead-out portion;
The molded body is adjacent to the pair of principal surfaces facing each other, the pair of principal surfaces, the pair of end surfaces facing each other, the pair of principal surfaces and the pair of end surfaces, A high region located at a relatively high position and a low region located at a relatively low position by forming one of the main surfaces as a mounting surface and forming a recess in the mounting surface. And
The coil is embedded in the molded body so that the winding axis of the winding portion is parallel to the concave portion of the mounting surface of the molded body,
The pair of lead portions are arranged so as to be drawn from the outer periphery of the winding portion to the mounting surface side and exposed in the low region of the mounting surface, and connected to the pair of external terminals in the low region. It is a surface mount inductor.   The mounting surface has a region connecting the high region and the low region, and the drawing portion extends so as to be exposed in the region connecting the high region and the low region and the low region. The surface-mount inductor according to claim 1.   The surface-mount inductor according to claim 1, wherein the molded body has an end surface adjacent to the mounting surface, and the external terminals are arranged to extend from the low region to the end surface.   The surface mount inductor according to claim 3, wherein the lead portion is also exposed at the end face, and the lead portion is connected to the external terminal also at the end face.   5. The surface-mount inductor according to claim 2, wherein the external terminal extends along a region connecting the high region and the low region and the low region. 6.   The direction in which the pair of end faces face each other is L direction, the length in the L direction of the leading portion in the low region is L1, and the length in the L direction of the external terminal in the low region is L2. The surface mount inductor according to any one of claims 1 to 5, wherein L2 and L2 are the same.   The direction in which the pair of end faces face each other is L direction, the length in the L direction of the leading portion in the low region is L1, and the length in the L direction of the external terminal in the low region is L2. The surface mount inductor according to any one of claims 1 to 5, wherein is greater than L1.

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