Patent Publication Number: US-2023137018-A1

Title: Coil component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2021-0146408 filed on Oct. 29, 2021 in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference for all purposes. 
     TECHNICAL FIELD 
     The present disclosure relates to a coil component. 
     BACKGROUND 
     Inductors, coil components, are typical passive electronic components used in electronic devices along with resistors and capacitors. 
     In the case of a coil component, in general, a body having a coil portion disposed therein is formed, and an external electrode is formed on the surface of the body to complete the component. In this case, coupling force between the body and the external electrode may be problematic, and contact resistance between the external electrode and the coil portion may be problematic. 
     SUMMARY 
     This Summary is provided to introduce a selection of concepts in simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
     An aspect of the present disclosure is to provide a coil component in which bonding force between a body and an external electrode may be increased. 
     An aspect of the present disclosure is to provide a coil component in which component characteristics may be improved by reducing resistance between a lead-out portion and an external electrode. 
     According to an aspect of the present disclosure, a coil component includes a body including magnetic powder particles and an insulating resin; a coil portion disposed in the body and including a lead-out portion exposed to one surface of the body; and an external electrode disposed on one surface of the body. The external electrode includes an intermetallic compound (IMC) disposed on the lead-out portion exposed to one surface of the body and having an average thickness of 1 μm or more, and a first electrode layer including a base resin, and a conductive connection portion disposed in the base resin and in contact with the intermetallic compound. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the present inventive concept will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a view schematically illustrating a coil component according to an embodiment; 
         FIG.  2    is a view schematically illustrating a cross-section taken along line I-I′ of  FIG.  1   ; 
         FIG.  3    is a diagram schematically illustrating enlarged area A of  FIG.  2   ; 
         FIG.  4    is an enlarged view of a region corresponding to area A of  FIG.  2    for a modified example of the coil component illustrated in  FIG.  1   ; 
         FIG.  5    is an enlarged view of a region corresponding to area A of  FIG.  2    for another modified example of the coil component illustrated in  FIG.  1   ; 
         FIG.  6    is an enlarged view of an area corresponding to area A of  FIG.  2    for another modified example of the coil component illustrated in  FIG.  1   ; 
         FIG.  7    is a view schematically illustrating a modified example of an external electrode of the coil component illustrated in  FIG.  1   ; 
         FIG.  8    is a view schematically illustrating a coil component according to another embodiment; 
         FIG.  9    is a view schematically illustrating a mold portion applied to the coil component illustrated in  FIG.  8   ; 
         FIG.  10    is a view schematically illustrating a cross-section taken along line II-II′ of  FIG.  8   ; 
         FIG.  11    is a diagram schematically illustrating enlarged area B of  FIG.  10   ; 
         FIG.  12    is a view schematically illustrating a modified example of the external electrode of the coil component illustrated in  FIG.  11   ; 
         FIG.  13    is a view schematically illustrating a cross-section taken along line III-III′ of  FIG.  12   ; 
         FIG.  14    is a view schematically illustrating a coil component according to another embodiment; 
         FIG.  15    is a view schematically illustrating a cross-section taken along line IV-IV′ of  FIG.  14   ; and 
         FIG.  16    is a diagram schematically illustrating enlarged area D of  FIG.  15   . 
     
    
    
     DETAILED DESCRIPTION 
     The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent to one of ordinary skill in the art. The sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent to one of ordinary skill in the art, with the exception of operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that would be well known to one of ordinary skill in the art may be omitted for increased clarity and conciseness. 
     The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided and thus, this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to one of ordinary skill in the art. 
     Herein, it is noted that use of the term “may” with respect to an embodiment or example, e.g., as to what an embodiment or example may include or implement, means that at least an embodiment or example exists in which such a feature is included or implemented while all examples and examples are not limited thereto. 
     Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween. 
     As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items. 
     Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples. 
     Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element&#39;s relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. Throughout the specification, “on” means to be located above or below the target part, and does not necessarily mean to be located above the direction of gravity. The device may also be oriented in other manners (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly. 
     The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof. 
     Due to manufacturing techniques and/or tolerances, variations of the shapes illustrated in the drawings may occur. Thus, the examples described herein are not limited to the detailed shapes illustrated in the drawings, but include changes in shape occurring during manufacturing. 
     The features of the examples described herein may be combined in various manners as will be apparent after gaining an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after gaining an understanding of the disclosure of this application. 
     The drawings may not be to scale, and the relative sizes, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience. 
     In the drawings, an L direction may be defined as a first direction or a length direction, a W direction may be defined as a second direction or a width direction, and a T direction may be defined as a third direction or a thickness direction. 
     Hereinafter, a coil component according to an embodiment will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals, and the overlapping description thereof will be omitted. 
     Various types of electronic components are used in electronic devices, and among these electronic components, various types of coil components may be appropriately used for removing noise and the like. 
     For example, in electronic devices, a coil component may be used as a power inductor, a high frequency inductor, a general bead, a high frequency bead (GHz Bead), a common mode filter, or the like. 
       FIG.  1    is a view schematically illustrating a coil component according to an embodiment.  FIG.  2    is a diagram schematically illustrating a cross-section taken along line I-I′ of  FIG.  1   . 
     Referring to  FIGS.  1  and  2   , a coil component  1000  according to an embodiment includes a body  100 , a coil portion  200 , an insulating film IF, and first and second external electrodes  300  and  400 . 
     The body  100  forms the exterior of the coil component  1000  according to the present embodiment, and the coil portion  200  is embedded therein. 
     The body  100  may be formed in a hexahedral shape as a whole. 
     With reference to  FIGS.  1  and  2   , the body  100  may include a first surface  101  and a second surface  102  opposing each other in the longitudinal direction (L), a third surface  103  and a fourth surface  104  opposing each other in the width direction (W), and a fifth surface  105  and a sixth surface  106  opposing each other in the thickness direction (T). Each of the first to fourth surfaces  101 ,  102 ,  103 , and  104  of the body  100  connects the fifth surface  105  and the sixth surface  106  of the body  100 . The sixth surface  106  of the body  100  may be used as a mounting surface when the coil component  1000  according to the present embodiment is mounted on a mounting board such as a printed circuit board. 
     The body  100  may be formed such that the coil component  1000  according to an embodiment in which the first and second external electrodes  300  and  400  to be described later have been formed has a length of 2.5 mm, a width of 2.0 mm and a thickness of 1.0 mm, or a length of 1.6 mm, a width of 0.8 mm and a thickness of 0.8 mm, or a length of 1.0 mm, a width of 0.5 mm and a thickness of 0.5 mm, or a length of 0.8 mm, a width of 0.4 mm and a thickness of 0.65 mm, but the present disclosure is not limited thereto. On the other hand, since the above-described exemplary numerical values for the length, width, and thickness of the coil component  1000  refer to numerical values that do not reflect process errors, it should be considered that the numerical values in the range that may be recognized as process errors are in the above-described exemplary numerical values. 
     Based on the optical microscope image or Scanning Electron Microscope (SEM) image of the longitudinal direction (L)-thickness direction (T) cross-section in the width direction (W) central portion of the coil component  1000 , the length of the above-described coil component  1000  may refer to a maximum value among the respective dimensions of a plurality of line segments, which respectively connect two outermost boundary lines of the coil component  1000  facing each other in the longitudinal direction L illustrated in the cross-sectional image and which are parallel to the longitudinal direction L. Alternatively, the length of the coil component  1000  may indicate a minimum value among the dimensions of respective line segments which respectively connect two outermost boundary lines facing each other in the longitudinal direction (L) of the coil component  1000  illustrated in the cross-sectional image and which are parallel to the longitudinal direction (L). Alternatively, the length of the coil component  1000  may refer to at least three arithmetic mean values among respective dimensions of a plurality of line segments connecting two outermost boundary lines disposed in the longitudinal direction L of the coil component  1000  illustrated in the cross-sectional image and that are parallel to the longitudinal direction L. In this case, the plurality of line segments parallel to the longitudinal direction L may be equally spaced from each other in the thickness direction T, but the scope of the present disclosure is not limited thereto. 
     Based on the optical microscope or Scanning Electron Microscope (SEM) image of the longitudinal direction (L)-thickness direction (T) cross-section in the width direction (W) central part of the coil component  1000 , the thickness of the above-described coil component  1000  may mean a maximum value among the dimensions of a plurality of respective line segments parallel to the thickness direction T while connecting the two outermost boundary lines facing in the thickness direction (T) of the coil component  1000  illustrated in the cross-sectional image, respectively. Alternatively, the thickness of the above-described coil component  1000  may indicate a minimum value among the dimensions of a plurality of respective line segments parallel to the thickness direction T while respectively connecting the two outermost boundary lines facing in the thickness direction (T) of the coil component  1000  illustrated in the cross-sectional image is connected. Alternatively, the thickness of the above-described coil component  1000  may indicate at least 3 more arithmetic mean values among respective dimensions of the plurality of line segments which connect the two outermost boundary lines facing in the thickness direction T of the coil component  1000  illustrated in the cross-sectional image and which are parallel to the thickness direction T. In this case, the plurality of line segments parallel to the thickness direction T may be equally spaced from each other in the longitudinal direction L, but the scope of the present disclosure is not limited thereto. 
     Based on the optical microscope or Scanning Electron Microscope (SEM) image of the longitudinal direction (L)-width direction (W) cross-section in the thickness direction (T) central portion of the coil component  1000 , the width of the above-described coil component  1000  may indicate a maximum value among the dimensions of a plurality of respective line segments parallel to the width direction W while connecting the two outermost boundary lines facing each other in the width direction (W) of the coil component  1000  illustrated in the cross-sectional image. Alternatively, the width of the above-described coil component  1000  may indicate a minimum value among the dimensions of a plurality of respective line segments parallel to the width direction W while respectively connecting two outermost boundary lines facing in the width direction (W) of the coil component  1000  illustrated in the cross-sectional image. Alternatively, the width of the above-described coil component  1000  may indicate at least three or more arithmetic mean values among dimensions of the plurality of respective line segments parallel to the width direction W while respectively connecting two outermost boundary lines disposed in the width direction (W) of the coil component  1000  illustrated in the cross-sectional image. In this case, the plurality of line segments parallel to the width direction W may be equally spaced from each other in the length direction L, but the scope of the present disclosure is not limited thereto. 
     Alternatively, each of the length, width, and thickness of the coil component  1000  may be measured by a micrometer measurement method. The micrometer measurement method may be performed by setting the zero point with a micrometer with Gage Repeatability and Reproducibility (R&amp;R), by inserting the coil component  1000  according to this embodiment between the tips of the micrometer, and turning the measuring lever of the micrometer to measure. On the other hand, in measuring the length of the coil component  1000  by the micrometer measurement method, the length of the coil component  1000  may mean a value measured once or may mean an arithmetic average of values measured a plurality of times. This may equally be applied to the width and thickness of the coil component  1000 . 
     The body  100  may have a core C passing through the central portion of the coil portion  200  to be described later. The core (C) may be formed as the magnetic composite sheet fills the through-hole formed in the central portion of the coil portion  200 , in forming the body  100  by laminating at least one magnetic composite sheet including magnetic powder and an insulating resin on the upper and lower portions of the coil portion  200 , but the present disclosure is not limited thereto. 
     The body  100  may include magnetic powder particles and an insulating resin. In detail, the body  100  may be formed by laminating one or more magnetic composite sheets including an insulating resin and magnetic powder dispersed in the insulating resin. The magnetic powder particles of the body  100  may be a magnetic powder of a magnetic composite sheet. 
     The magnetic powder particles may be ferrite or a magnetic metal material. 
     Ferrite may be at least one of, for example, spinel-type ferrites such as Mg—Zn, Mn—Zn, Mn—Mg, Cu—Zn, Mg—Mn—Sr or Ni—Zn, hexagonal ferrites such as Ba—Zn-based, Ba—Mg-based, Ba—Ni-based, Ba—Co-based, and Ba—Ni—Co-based ferrites, Y-based garnet-type ferrites, and Li-based ferrites. 
     The magnetic metal material may include at least one selected from the group consisting of iron (Fe), silicon (Si), chromium (Cr), cobalt (Co), molybdenum (Mo), aluminum (Al), niobium (Nb), copper (Cu) and nickel (Ni). For example, magnetic powder particles of the magnetic metal material may be formed of at least one of pure iron powder, Fe—Si alloy powder, Fe—Si—Al alloy powder, Fe—Ni alloy powder, Fe—Ni—Mo alloy powder, Fe—Ni—Mo—Cu alloy powder, Fe—Co alloy powder, Fe—Ni—Co alloy powder, Fe—Cr alloy powder, Fe—Cr—Si alloy powder, Fe—Si—Cu—Nb alloy powder, Fe—Ni—Cr alloy powder, and Fe—Cr—Al alloy powder. 
     The magnetic powder particles of the magnetic metal material may be amorphous or crystalline. For example, the magnetic powder particles of the magnetic metal material may be an amorphous Fe—Si—B—Cr-based alloy, but is not necessarily limited thereto. 
     Each of the magnetic powder particles may have an average diameter of about 0.1 μm to 30 μm, but is not limited thereto. In this specification, the particle size or average diameter may mean a particle size distribution expressed as D90 or D50. 
     The body  100  may include two or more types of magnetic powder particles dispersed in the insulating resin. In this case, the different types of magnetic powder particles means that the magnetic powder particles dispersed in the insulating resin are distinguished from each other by any one of an average diameter, composition, crystallinity, and shape. 
     The insulating resin may include, but is not limited to, epoxy, polyimide, liquid crystal polymer, etc. alone or in combination. 
     The coil portion  200  is disposed inside the body  100  and expresses the characteristics of the coil component. For example, when the coil component  1000  of the present embodiment is used as a power inductor, the coil portion  200  stores an electric field as a magnetic field to maintain an output voltage, thereby stabilizing the power of the electronic device. 
     The coil portion  200  may be a winding type coil formed by winding a metal wire MW such as a copper wire of which the surface is coated with an insulating film IF in a spiral shape. 
     The coil portion  200  includes a winding portion  210  formed with at least one turn with respect to the core (C) as an axis, and first and second lead-out portions  231  and  232  respectively extended from both ends of the winding portion  210  and exposed to the first and second surfaces of the body  100 , respectively. The first lead-out portion  231  extends from one end of the winding portion  210  and is exposed to the first surface  101  of the body  100 , and the second lead-out portion  232  extends from the other end of the winding portion  210  and is exposed to the second surface  102  of the body  100 . 
     The winding portion  210  may be formed by winding the metal wire MW such as a copper wire having a surface coated with an insulating film IF in a spiral shape. As a result, in the cross-section of the component (for example, the L-T cross-section as in  FIG.  2   ), all surfaces of each turn of the winding portion  210  (corresponding to a total of four line segments constituting the upper and lower surfaces of each turn and two sides opposing each other, in the L-T cross-section of  FIG.  2   ) has a form covered with an insulating film IF. The winding portion  210  may be composed of at least one layer. Each layer of the winding portion  210  is formed in a planar spiral, and may have at least one number of turns. 
     The first and second lead-out portions  231  and  232  may be integrally formed with the winding portion  210 . By winding the metal wire MW such as a copper wire coated with an insulating film IF in a spiral shape, the winding portion  210  and the first and second lead-out portions  231  and  232  may be integrally formed. 
     The metal wire MW may be formed of a conductive material, such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo) or alloys thereof, but is not limited thereto. 
     The insulating layer IF may include an insulating material such as enamel, paralin, epoxy, or polyimide. The insulating layer IF may be formed of two or more layers. As a non-limiting example, the insulating film IF may include a coating layer in contact with the metal wire MW, and a fusion layer formed on the coating layer. The fusion layer may be combined with the fusion layer of the metal wire MW constituting turns adjacent to each other by heat and pressure after winding the metal wire MW as a wire in a coil shape. In the case of winding the metal wire MW including the insulating film IF having such a structure, the fusion layers of a plurality of turns of the winding portion  210  may be fused to each other and integrated. 
     On the other hand, although  FIGS.  1  and  2    illustrate that the coil portion  200  of the present embodiment is an alpha winding, the scope of the present embodiment is not limited thereto, and a coil as an edge-wise winding may also belong to this embodiment. 
     The first and second external electrodes  300  and  400  include the first electrode layers  310  and  410 , the second electrode layers  330 ,  340 ;  430 ,  440  disposed on the first electrode layers  310  and  410 , the lead-out portion, and intermetallic compounds ( 320  and  420  in  FIG.  3   ) disposed between the  231  and  232  and the first electrode layers  310  and  410 . 
     The first and second external electrodes  300  and  400  are spaced apart from each other on the body  100  to be connected to the coil portion  200 . The first external electrode  300  is connected while being in contact with the first lead-out portion  231  of the coil portion  200  disposed on the first surface  101  of the body  100  and exposed to the first surface  101  of the body  100 . The second external electrode  400  is connected while being in contact with the second lead-out portion  232  of the coil portion  200  disposed on the second surface  102  of the body  100  and exposed to the second surface  101  of the body  100 . 
     On the other hand, the first and second external electrodes  300  and  400  are different only in the connection relationship with the first and second lead-out portions  231  and  232  and the positions formed on the body  100 , respectively, while the first and second external electrodes  300  and  400  include the first and second electrode layers  310 ,  330 ,  340 ,  410 ,  430  and  440 , and intermetallic compounds  320  and  420  equally. Accordingly, in the following description of the first and second external electrodes  300  and  400 , the first external electrode  300  disposed on the first surface  101  of the body  100  will be mainly described, and the second external electrode A description of  400  will be omitted. A description to be given later of the first external electrode  300  may be equally applied to the second external electrode  400 . 
       FIG.  3    is a diagram schematically illustrating enlarged area A of  FIG.  2   . 
     As illustrated in  FIG.  3   , the first external electrode  300  includes a first electrode layer  310  and an intermetallic compound  320 , and may further include second electrode layers  330  and  340 . The first electrode layer  310  includes a base resin  311  and a conductive connection portion  312 . 
     The first electrode layer  310  covers the first surface  103  of the body  100 . The first electrode layer  310  serves to electrically and mechanically bond the body  100  and the second electrode layers  330  and  340 , and serves to absorb tensile stress generated in a mechanical or thermal environment when the coil component  1000  according to the present embodiment is mounted on a mounting board, thereby preventing cracks from occurring. 
     The first electrode layer  310  may be formed by applying a conductive paste in which a base resin and a plurality of metal powder particles are dispersed to the first surface  101  of the body  100 , and drying and curing the applied conductive paste. After the above process, the base resin of the conductive paste may become the base resin  311  of the first electrode layer  310 , and the plurality of metal powder particles of the conductive paste may become a conductive connection portion  312  of the first electrode layer  310  by the pressure and heat in the process. In detail, the conductive paste may include, as a plurality of metal powder particles, powder particles of a low-melting-point metal (for example, tin (Sn), or tin (Sn)-bismuth (Bi) alloy, tin (Sn)-lead (Pb) alloy, tin (Sn)-copper (Cu) alloy, tin (Sn)-silver (Ag) alloys and alloys containing tin (Sn) such as tin (Sn)-silver (Ag)-copper (Cu) alloys) having a melting point lower than the curing temperature of the base resin; and powder particles of a high-melting-point metal (e.g., copper, silver, or the like) having a melting point higher than the melting point of the low-melting-point metal powder particles. The low-melting-point metal powder particles are melted by the pressure and heat in the above-described process and react with the metal of the high-melting-point metal powder particles to form the conductive connection portion  312 . 
     The base resin  311  serves to mechanically bond between the body  100  and the second electrode layers  330  and  340 . The base resin  311  may include a thermosetting resin having electrical insulation properties. The thermosetting resin may be, for example, an epoxy resin, but the present disclosure is not limited thereto. 
     For the above reasons, the conductive connection portion  312  may include a metal of low-melting-point metal powder particles and a metal of high-melting-point metal powder particles together. As a non-limiting example, the conductive connection portion  312  may be formed of an alloy including two or more selected from tin (Sn), lead (Pb), indium (In), copper (Cu), silver (Ag), and bismuth (Bi). As a non-limiting example, the conductive connection portion  312  may include at least one of copper (Cu) and silver (Ag) and tin (Sn). For example, when the aforementioned conductive paste includes silver (Ag) powder and tin (Sn) powder, the conductive connection portion  312  may include Ag 3 Sn. 
     The conductive connection portions  312  may be present in a randomly dispersed form in the base resin  311 , but may be included in the first electrode layer  310  in a form connected to each other. 
     The intermetallic compound (IMC) is disposed on the exposed surface of the first lead-out portion  231  exposed to the first surface  101  of the body  100  and is in contact with the conductive connection portion  312 . The intermetallic compound  320  serves to connect the first lead-out portion  231  and the conductive connection portion  312 . Accordingly, the intermetallic compound  320  serves to improve the electrical and mechanical bonding between the first lead-out portion  231  and the conductive connection portion  312  and to reduce the contact resistance between the first lead-out portion  231  and the conductive connection portion  312  (or the contact resistance between the coil portion and the first external electrode). 
     The intermetallic compound  320  may be disposed only between the exposed surface of the first lead-out portion  231  exposed to the first surface  101  of the body  100  and the first electrode layer  310 . In detail, the intermetallic compound  320  may be disposed only at the interface between the exposed surface of the first lead-out portion  231  exposed to the first surface  101  of the body  100  and the first electrode layer  310 . Therefore, for the above reasons, the intermetallic compound  320  is not disposed in a region in which the first lead-out portion  231  is not exposed, in the first surface  101  of the body  100 , and the first electrode layer  310  is disposed in the corresponding area and is in contact with the first surface  101  of the body  100 . As a result, the bonding force between the body  100  and the first electrode layer  310  may increase. For example, the body  100  includes an insulating resin, and since the first electrode layer  310  in contact with the first surface  101  of the body  100  has the same polymer material as the body  100 , the bonding force between the body  100  and the first electrode layer  310  may increase. 
     The intermetallic compound  320  may be formed by a reaction between a metal component of the low-melting-point metal particle included in the conductive paste for forming the first electrode layer and a metal component of the first lead-out portion  231 . In detail, the low-melting-point metal powder particles included in the conductive paste for forming the first electrode layer are melted by heat and pressure in the process of curing the conductive paste for forming the first electrode layer, and reacts with the metal component of the first lead-out portion  231 , thereby forming an intermetallic compound  320 . As a result, the intermetallic compound  320  has a form that exists only at the interface between the exposed surface of the first lead-out portion  231  exposed to the first surface  101  of the body  100  and the first electrode layer  310 . 
     The intermetallic compound  320  may include the metal of the low-melting-point metal particle and the metal of the first lead-out portion  231  for the above-mentioned reasons. As a non-limiting example, the intermetallic compound  320  may be formed of two or more alloys selected from tin (Sn), lead (Pb), indium (In), copper (Cu), silver (Ag), nickel (Ni), and bismuth (Bi). When the first lead-out portion  231  is formed of copper (Cu), the intermetallic compound  320  may include a Cu—Sn-based alloy. On the other hand, that the intermetallic compound  320  includes a Cu—Sn-based alloy means that the alloy is an alloy composed of Cu and Sn, or an alloy containing Cu and Sn and containing other metals or non-metal elements. 
     The thickness T 1  of the intermetallic compound  320  may be 1.0 μm or more. When the thickness of the intermetallic compound  320  is less than 1.0 μm, defects may occur in lead heat resistance evaluation, as will be described later. 
     In this case, the thickness T 1  of the intermetallic compound  320  may be 10 μm or less. When the thickness of the intermetallic compound  320  is greater than 10 μm, as will be described later, cracks may occur in the intermetallic compound  320 , so that the electrical connectivity between the coil portion  200  and the first external electrode  300  is reduced. 
     In this case, the thickness T 1  of the intermetallic compound  320  may be 3 μm or less. When the thickness of the intermetallic compound  320  is greater than 3 μm, the second electrode layer  330 ,  340  may not be sufficiently formed in plating the second electrode layer  330 ,  340  to be described later on the first electrode layer  310  by plating. Due to this, the mechanical coupling force between the coupling member such as solder and the first external electrode  300  may be reduced. 
     On the other hand, the intermetallic compound  320 , for example, as illustrated in  FIG.  3   , the first lead-out portion  231  and the first electrode layer  310  in the longitudinal-thickness direction cross-section (L-T cross-section) taken from the central portion in the width direction. The boundary area of the liver may be measured by scanning an image with a scanning electron microscope (SEM). For example, in the image, the first and second lead-out portion  231 , the intermetallic compound  320  and the first electrode layer  310  may be distinguished by contrast due to the difference in the type of metal element, the difference in the content of a specific metal element, and whether or not a polymer material is included. The layer disposed between the first lead-out portion  231  and the first electrode layer  310  may be determined as the intermetallic compound  320 . Alternatively, by the contrast illustrated in the image, the first lead-out portion  231  and the intermetallic compound  320  that do not contain a polymer material and the first electrode layer  310  that contains a polymer material may be distinguished, and EDS component analysis of the region (the first lead-out portion  231  and the intermetallic compound  320 ) not containing the polymer material is performed; and a region in which the mass ratio (wt %) of the metal component (e.g., tin (Sn)) of the aforementioned low-melting-point metal powder particles is 10 wt % or more may be determined as the intermetallic compound  320 . 
     In addition, the thickness (T 1 ) of the intermetallic compound  320  may be obtained by measuring the dimension along the longitudinal direction (L) of the intermetallic compound ( 320 ) determined in the image at least three times along the thickness direction (T) and by performing the arithmetic mean thereof. The plurality of measurement points along the thickness direction T may be equally spaced along the thickness direction T, but are not limited thereto. 
     The intermetallic compound  320  may be disposed in the form of a plurality of islands on the exposed surface of the first lead-out portion  231 . For example, the intermetallic compound  320  may be disposed in a plurality of spaced apart from each other on the exposed surface of the first lead-out portion  231 . In addition, the plurality of islands may be formed in the form of a layer. 
     The second electrode layers  330  and  340  are disposed on the first electrode layer  310  to contact the conductive connection portion  312 . As a non-limiting example, each of the second electrode layers  330  and  340  may be a plating layer formed by electroplating. The second electrode layers  330  and  340  may have, for example, a structure in which a nickel plating layer  330  and a tin plating layer  340  are sequentially stacked. The nickel plating layer  330  is in contact with the conductive connection portion  312  of the first electrode layer  310  and the base resin  311 . 
     The first electrode layer  310  may cover the first surface  101  of the body  100 , and extend to at least a portion of each of the third to sixth surfaces  103 ,  104 ,  105  and  106  of the body  100  connected to the first surface  101  of the body  100 . The second electrode layers  330  and  340  may cover the first electrode layer  310  or may be disposed only in a partial region of the first electrode layer  310 . 
     Tables 1 to 3 are evaluations of various properties according to the average thickness change of the intermetallic compound. 
     Examples 1 to 15 of Tables 1 to 3, while making the average thickness of the first electrode layer the same, to change the thickness of the intermetallic compound, the composition and content of the metal powder particles in the conductive paste for forming the first electrode layer are adjusted or, the conductive paste curing temperature was adjusted. 
     Except for the above differences, all other conditions are the same in Examples 1 to 15. 
     Table 1 illustrates the results of the lead heat resistance evaluation of the external electrode according to the change in the average thickness of the intermetallic compound  320 . In the case of lead heat resistance evaluation, by performing a lead heat resistance test at a temperature of 270° C. and a time of 10 seconds, Rdc change rate of 10% or less compared to before the lead heat resistance test was evaluated as pass (O), and Rdc change rate of more than 10% was evaluated as fail (X). 
     
       
         
           
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                 Lead heat resistance 
               
               
                   
                 Average thickness (μm) 
                 evaluation 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 #1 
                 0.34 
                 X 
               
               
                 #2 
                 0.53 
                 X 
               
               
                 #3 
                 0.78 
                 X 
               
               
                 #4 
                 0.9 
                 X 
               
               
                 #5 
                 1.10 
                 O 
               
               
                 #6 
                 1.76 
                 O 
               
               
                 #7 
                 2.14 
                 O 
               
               
                 #8 
                 2.30 
                 O 
               
               
                 #9 
                 2.45 
                 O 
               
               
                 #10  
                 2.73 
                 O 
               
               
                 #11  
                 3.38 
                 O 
               
               
                 #12  
                 4.97 
                 O 
               
               
                 #13  
                 5.56 
                 O 
               
               
                 #14  
                 8.01 
                 O 
               
               
                 #15  
                 13.77 
                 O 
               
               
                   
               
            
           
         
       
     
     Referring to Table 1, each of Examples 1 to 4, in which the average thickness of the intermetallic compound  320  is less than 1 μm, was defective in lead heat resistance evaluation. In each of Examples 5 to 15, in which the average thickness of the intermetallic compound  320  was 1 μm or more, no defects occurred in the evaluation of lead heat resistance. Therefore, in this embodiment, the average thickness of the intermetallic compound  320  is 1 μm or more, so that the lead heat resistance property may be improved, and the change in Rdc of the component may be brought within a certain range. 
     Table 2 illustrates whether cracks exist in the intermetallic compound according to the change in the average thickness of the intermetallic compound  320 . The presence of cracks in the intermetallic compound was determined by visual inspection based on the SEM image of the cross-section of the component to determine the presence or absence of cracks (O, X). 
     
       
         
           
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                   
                 Average thickness (μm) 
                 Cracks 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 #1 
                 0.34 
                 X 
               
               
                 #2 
                 0.53 
                 X 
               
               
                 #3 
                 0.78 
                 X 
               
               
                 #4 
                 0.9 
                 X 
               
               
                 #5 
                 1.10 
                 X 
               
               
                 #6 
                 1.76 
                 X 
               
               
                 #7 
                 2.14 
                 X 
               
               
                 #8 
                 2.30 
                 X 
               
               
                 #9 
                 2.45 
                 X 
               
               
                 #10  
                 2.73 
                 X 
               
               
                 #11  
                 3.38 
                 X 
               
               
                 #12  
                 4.97 
                 X 
               
               
                 #13  
                 5.56 
                 X 
               
               
                 #14  
                 8.01 
                 X 
               
               
                 #15  
                 13.77 
                 0 
               
               
                   
               
            
           
         
       
     
     Referring to Table 2, in each of Examples 1 to 14 in which the average thickness of the intermetallic compound  320  is 10 μm or less, cracks did not occur in the intermetallic compound  320 , but the average thickness of the intermetallic compound  320  was greater than 10 μm in Example 15, which was larger than μm, cracks occurred in the intermetallic compound  320 . In the present embodiment, by limiting the average thickness of the intermetallic compound  320  to 10 μm or less, the occurrence of cracks in the intermetallic compound  320  is reduced to minimize the change in Rdc. In addition, it is possible to relatively reduce the resistance between the coil portion  200  and the first external electrode  300 . 
     Table 3 illustrates the results of the solderability test according to the change in the average thickness of the intermetallic compound  320 . The solder wettability test evaluates the wettability between the outermost layer (finishing layer) of the external electrode of the component and the solder used when the component is mounted on the mounting board, and solder wettability is proportional to the formation area of the second metal layer, which is the outermost layer of the external electrode. For example, the high wettability of the solder means that the second electrode layer, which is the finishing layer of the external electrode, covers the exposed surface of the first electrode layer at a relatively high ratio. 
     The solder wettability test was performed, with the formation height of the solder fillet as a reference, after solder is interposed between the component in which the second metal layer of the external electrode (in the case of including the formation of an Sn plating layer) is formed, and the pad of the mounting board, and solder reflow is performed. For example, when the height of the solder fillet after solder reflow is ⅓ or more of the total thickness of the component including the external electrode, it was determined as pass (O), and when the height of the solder fillet was less than ⅓ of the total thickness of the component including the external electrode, it was judged as fail (X). 
     
       
         
           
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                   
                 Average thickness (μm) 
                 Solderability Test 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                 #1 
                 0.34 
                 O 
               
               
                 #2 
                 0.53 
                 O 
               
               
                 #3 
                 0.78 
                 O 
               
               
                 #4 
                 0.9 
                 O 
               
               
                 #5 
                 1.10 
                 O 
               
               
                 #6 
                 1.76 
                 O 
               
               
                 #7 
                 2.14 
                 O 
               
               
                 #8 
                 2.30 
                 O 
               
               
                 #9 
                 2.45 
                 O 
               
               
                 #10  
                 2.73 
                 O 
               
               
                 #11  
                 3.38 
                 X 
               
               
                 #12  
                 4.97 
                 X 
               
               
                 #13  
                 5.56 
                 X 
               
               
                 #14  
                 8.01 
                 X 
               
               
                 #15  
                 13.77 
                 X 
               
               
                   
               
            
           
         
       
     
     Referring to Table 3, in each of Examples 1 to 10, in which the average thickness of the intermetallic compound  320  is 3 μm or less, a defect did not occur in the solderability test, and in each of Examples 11 to 15, in which the average thickness of the intermetallic compound  320  was greater than 3 μm, a defect occurred in the solderability test. This means that as the average thickness of the intermetallic compound  320  increases, the metal powder particles in the conductive paste for forming the first electrode layer are consumed to form the intermetallic compound  320 , and as a result, in forming the second electrode layer by plating the surface of the first electrode layer, it is considered that this is because the formation area of the second electrode layer is relatively low. 
       FIG.  4    is a diagram illustrating enlarged area corresponding to area A of  FIG.  2    for a modified example of the coil component illustrated in  FIG.  1   .  FIG.  5    is a diagram illustrating enlarged area corresponding to area A of  FIG.  2    for another modified example of the coil component illustrated in  FIG.  1   .  FIG.  6    is a view illustrating enlarged area corresponding to area A of  FIG.  2    for another modified example of the coil component illustrated in  FIG.  1   . 
     Referring to  FIGS.  4  to  6   , in the modified examples of the present embodiment, the first electrode layer  310  may further include a plurality of metal powder particles  313 . The plurality of metal powder particles  313  may be disposed in the first electrode layer  310  in a form at least partially covered by the conductive connection portion  312 . 
     In the curing process for forming the first electrode layer  310 , the plurality of metal powder particles  313  may be formed of a low-melting-point metal particle in which at least a portion of the high-melting-point metal particle included in the conductive paste for forming the first electrode layer is melted. It may not react and may remain. 
     The metal powder particles  313  may include at least one of nickel (Ni), silver (Ag), silver (Ag) coated copper (Cu), tin (Sn) coated copper (Cu), and copper (Cu). 
     The metal powder particles  313  included in the first electrode layer  310  may be formed only in a spherical shape as illustrated in  FIG.  4    or only in a flake shape as illustrated in  FIG.  5   , or as illustrated in  FIG.  6   , may be of a mixed type of spherical and flake types. 
     The average size of the metal powder particles  313  may be in a range from 0.2 μm to 20 μm. On the other hand, the average size of the metal powder particles  313  may indicate any one of the diameters of the plurality of metal powder particles  313  illustrated in the image, based on the optical micrograph or SEM image of the L-T cross-section taken from the central portion in the W direction. The diameter may mean a maximum dimension among a plurality of arbitrary line segments passing through the single metal particle  313 . Alternatively, the average size of the metal powder particles  313  may be an arithmetic average of at least three or more diameters from among the plurality of metal powder particles  313  illustrated in the picture, respectively. Alternatively, the average size of the metal powder particles  313  may refer to the diameter of the virtual circle, based on any one of the plurality of metal powder particles  313  illustrated in the photo, assuming a circle having the same area as the cross-sectional area of the metal particle  313 . Alternatively, the average size of the metal powder particles  313  may be an arithmetic mean of diameters obtained by assuming that at least three or more of the plurality of metal powder particles  313  illustrated in the photo are the above-described iso-area circles, respectively. 
     On the other hand, although not illustrated, the coil component  1000  according to the present embodiment is disposed on at least a portion of each of the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105  and  106  of the body  100 . It may further include an insulating layer. For example, the surface insulating layer may be disposed on at least a portion of the regions in which the first and second external electrodes  300  and  400  are not formed among the first to sixth surfaces  101 ,  102 ,  103 ,  104 ,  105  and  106  of the body  100 . As another example, the surface insulating layer may cover regions corresponding to the first to fifth surfaces  101 ,  102 ,  103 ,  104 ,  105  of the body  100  among the outer surfaces of the components formed by the body  100  and the first and second external electrodes  300  and  400 , and may be formed in a region in which the first and second external electrodes  300  and  400  are not formed among the sixth surface  106  of the body  100 . 
       FIG.  7    is a view schematically illustrating a modified example of an external electrode of the coil component illustrated in  FIG.  1   . Referring to  FIG.  7   , the first external electrode  300  of the coil component  1000 ′ according to a modification of the present embodiment covers the first surface  101  of the body  100 , and extends to the sixth surface  106 . The second external electrode  400  covers the second surface  102  of the body  100  and extends to the sixth surface  106  of the body  100 . On the sixth surface  106  of the body  100 , the first and second external electrodes  300  and  400  are spaced apart from each other. For example, in this modified example, the first and second external electrodes  300  and  400  are formed in an L shape. 
     For example, each of the first electrode layers  310  and  410  and the second electrode layers ( 330 ,  340 ;  430 ,  440 ) may be formed on position of formation of the first and second external electrodes  300  and  400 . As another example, the first electrode layers  310  and  410  are formed on the formation positions of the first and second external electrodes  300  and  400  described above, and the second electrode layers ( 330 ,  340 ;  430 ,  440 ) may be disposed only in a region disposed on the sixth surface  106  of the body  100  among the first electrode layers  310  and  410 . 
     In this modified example, the volume occupied by the first and second external electrodes  300  and  400  in the entire component may be reduced, so that the volume of the body  100  may be increased when a component having the same size is assumed. For example, the volume of the magnetic material based on the components of the same size may increase. 
       FIG.  8    is a view schematically illustrating a coil component according to another embodiment.  9  is a view schematically illustrating a mold portion applied to the coil component illustrated in  FIG.  8   .  FIG.  10    is a view schematically illustrating a cross-section taken along line II-II′ of  FIG.  8   .  11  is a diagram schematically illustrating enlarged area B of  FIG.  10   . 
     Comparing  FIGS.  1  and  2    and  FIGS.  8  to  10   , the coil component  2000  according to the present embodiment has a structure of the body  100  when compared with the coil component  1000  according to the embodiment, and the structure of the first and second lead-out portions  231  and  232  are different from each other. Therefore, in describing this embodiment, only the body  100  and the first and second lead-out portions  231  and  232  different from the coil component  1000  according to the embodiment will be described. For the rest of the configuration of the present embodiment, the description in one embodiment may be applied as it is. In addition, also in this embodiment, modifications of an embodiment may be applied as it is. 
     The body  100  applied to the coil component  2000  according to the present embodiment includes a mold portion  110  and a cover part  120 . The side surfaces of the mold portion  110  and the cover part  120  constitute the first to fifth surfaces  101 ,  102 ,  103 ,  104 , and  105  of the body  100 , and the other surface of the mold portion  110  (the lower surface of the mold portion  110  in the direction of  FIGS.  8  to  10   ) constitutes the sixth surface  106  of the body  100 . Hereinafter, the other surface of the mold portion  110  and the sixth surface  106  of the body  100  are used in the same meaning. 
     The mold portion  110  has a support part  111  having one surface and the other surface opposing each other, and a core C protruding from one surface of the support part  111 . The support part  111  supports the coil portion  200  disposed on one surface of the support part  111 . A core C is disposed to protrude from one surface of the support  111 . The core C is disposed in the central portion of one surface of the support  111  and penetrates the coil  200 . 
     Referring to  FIG.  9   , on the other surface of the support part  111  and one side connecting the one surface and the other surface of the support part  111 , groove portions R and R′ in which first and second lead-out portions  231  and  232  extending from both ends of the winding portion  210  are disposed are formed. The grooves R and R′ are formed in a shape corresponding to the first and second lead-out portions  231  and  232 . On the other hand, the grooves R and R′ may be formed in the process of forming the mold portion  110  with a mold or may be formed in the mold portion  110  in the process of pressing the cover part  120 . As another example, the first and second lead-out portions  231  and  232  may pass through the mold portion  110  and be exposed to the other surface of the mold portion  110 . 
     For example, the mold portion  110  may be formed using a mold having an internal space corresponding to the shape of the support part  111  and the core C. The mold portion  110  may be formed by filling magnetic powder particles in the mold. As another example, the mold portion  110  may be formed by filling the mold with a composite material including magnetic powder particles and an insulating resin. A process of applying high temperature and high pressure to the magnetic powder particles or composite material in the mold may be additionally performed, but the present disclosure is not limited thereto. The support  111  and the core C may be integrally formed by the process using the above-described mold, so that a boundary may not be formed between them. 
     The cover part  120  is disposed on one surface of the mold portion  110  to cover the coil portion  200 . The cover part  120  may be formed by disposing a magnetic composite sheet in which magnetic powder particles are dispersed in an insulating resin on the mold unit  110  and the coil portion  200  and then heating and pressing. Through the above process, the mold portion  110  and the cover part  120  may be integrated with each other so that the boundary between them is not distinguished without a separate treatment, but the scope of the present disclosure is not limited thereto. 
     The first and second lead-out portions  231  and  232  applied to this embodiment are exposed together as the sixth surface  106  of the body  100 , unlike in the embodiment. For example, the first and second lead-out portions  231  and  232  may be disposed in the groove portions R and R′ of the mold portion  110 , and be exposed on the sixth surface  106  of the body  100  to be spaced apart from each other. 
     On the other hand, as illustrated in  FIG.  11   , in this embodiment, the intermetallic compound  320  may be disposed at an interface between the exposed surface of the first lead-out portion  231  exposed to the sixth surface  106  of the body  100  and the first electrode layer  310 . 
       FIG.  12    is a view schematically illustrating a modified example of an external electrode of the coil component illustrated in  FIG.  11   . 
     Referring to  FIG.  12   , the first and second external electrodes  300  and  400  of the coil component  2000 ′ according to a modified example of the present embodiment are spaced apart from each other on the sixth surface  106  of the body  100 , and is not disposed on the first to fifth surfaces  101 ,  102 ,  103 ,  104 ,  105  of the body  100 . Each of the first and second external electrodes  300  and  400  may have a shape extending along the W direction from the sixth surface  106  of the body  100 . For example, in the present embodiment, since each of the first and second lead-out portions  231  and  232  has a shape extending along the W direction from the sixth surface  106  of the body  100 , each of the first and second external electrodes  300  and  400  connected to the exposed first and second lead-out portions  231  and  232  also has a shape extending along the W direction from the sixth surface  106  of the body  100 . 
     In this modified example, the volume occupied by the first and second external electrodes  300  and  400  in the entire component may be reduced, so that the volume of the body  100  may be increased when a component having the same size is assumed. For example, it is possible to increase the volume of the magnetic material based on the components of the same size. 
       FIG.  14    is a view schematically illustrating a coil component according to another embodiment.  15  is a view schematically illustrating a cross-section taken along line IV-IV′ of  FIG.  14   . 
     Comparing  FIGS.  1  and  2    and  FIGS.  14  to  15   , a coil component  3000  according to this embodiment has a difference when compared with the coil component  1000  according to the embodiment, in that a coil portion  200  is different, and a substrate IL is further included. Therefore, in describing the present embodiment, only the coil portion  200  and the substrate IL different from the coil component  1000  according to the embodiment will be described. For the rest of the configuration of the present embodiment, the description in one embodiment may be applied as it is. In addition, also in this embodiment, modifications of an embodiment may be applied as it is. 
     The substrate IL is disposed in the body  100 . The substrate IL is configured to support the coil portion  200 . The substrate IL may be formed of an insulating material including at least one of a thermosetting insulating resin such as an epoxy resin, a thermoplastic insulating resin such as polyimide, and a photosensitive insulating resin. Alternatively, the substrate IL may be formed of an insulating material in which a reinforcing material such as glass fiber or an inorganic filler is impregnated into at least one resin described above. By way of example, the substrate IL may be formed of an insulating material such as Copper Clad Laminate (CCL), an insulating material (Unclad CCL) from which the copper foil has been removed from the copper clad laminate, prepreg, Ajinomoto Build-up Film (ABF), FR-4, Bismaleimide Triazine (BT) film, Photo Imageable Dielectric (PID) film, or the like, but the material thereof is not limited thereto. 
     As the inorganic filler, at least one selected from the group consisting of silica (SiO 2 ), alumina (Al 2 O 3 ), silicon carbide (SiC), barium sulfate (BaSO 4 ), talc, mud, mica powder, aluminum hydroxide (Al(OH) 3 ), magnesium hydroxide (Mg(OH) 2 ), carbonic acid Calcium (CaCO 3 ), magnesium carbonate (MgCO 3 ), magnesium oxide (MgO), boron nitride (BN), aluminum borate (AlBO 3 ), barium titanate (BaTiO 3 ) and calcium zirconate (CaZrO 3 ) may be used. 
     When the substrate IL is formed of an insulating material including a reinforcing material, the substrate IL may provide greater rigidity. When the substrate IL is formed of an insulating material that does not contain glass fibers, it may be advantageous because the volume of the coil portion  200  may be increased within the same size of the body  100 . When the substrate IL is formed of an insulating material including a photosensitive insulating resin, the number of processes for forming the coil portion  200  is reduced, which is advantageous in reducing production costs and allows the formation of fine vias. 
     The coil portion  200  includes first and second coil patterns  211  and  212 , first and second lead-out portions  231  and  232 , and vias. 
     In detail, based on the directions of  FIGS.  14  and  15   , a first coil pattern  211  and a first lead-out portion  231  are disposed on a lower surface of the substrate IL facing the sixth surface  106  of the body  100 , and the second coil pattern  212  and the second lead-out portion  232  are disposed on the upper surface of the substrate IL facing the lower surface of the substrate IL. On the lower surface of the substrate IL, the first coil pattern  211  is contacted with the first lead-out portion  231 . On the upper surface of the substrate IL, the second coil pattern  212  is connected to the second lead-out portion  232  and the via passes through the substrate IL to contact and be connected to inner ends of each of the first coil pattern  211  and the second coil pattern  212 . Therefore, the coil portion  200  may function as a single coil as a whole. 
     Each of the first coil pattern  211  and the second coil pattern  212  may be in the form of a plane spiral in which at least one turn is formed about the core C as an axis. For example, the first coil pattern  211  may form at least one turn on the lower surface of the substrate IL with the core C as an axis. 
     The first and second lead-out portions  231  and  232  are exposed to the first and second surfaces  101  and  102  of the body  100 , respectively. For example, the first lead-out portion  231  is exposed to the first surface  101  of the body  100 , respectively, and the second lead-out portion  232  is exposed to the second surface  102  of the body  100 . 
     At least one of the first and second coil patterns  211  and  212  and the first and second lead-out portions  231  and  232  may include at least one conductive layer. 
     For example, when forming the second coil pattern  212  and the second lead-out portion  232  on the upper surface of the substrate IL by plating based on the directions of  FIGS.  14  and  15   , each of the second coil pattern  212  and the second lead-out portion  232  may include a seed layer such as an electroless plating layer and an electrolytic plating layer. In this case, the electroplating layer may have a single-layer structure or a multi-layer structure. The electroplating layer having a multi-layer structure may be formed in a conformal film structure in which one electroplating layer is covered by the other electroplating layer, and may be formed in a shape in which another electroplating layer is laminated on only one surface of one electroplating layer. The seed layer of the second coil pattern  212  and the seed layer of the second lead-out portion  232  may be integrally formed so that a boundary may not be formed between them, but is not limited thereto. The electrolytic plating layer of the second coil pattern  212  and the electrolytic plating layer of the second lead-out portion  232  are integrally formed so that a boundary may not be formed between them, but the present disclosure is not limited thereto. 
     Each of the first and second coil patterns  211  and  212 , the first and second lead-out portions  231  and  232  and the vias may be formed of a conductive material such as copper (Cu), aluminum (Al), silver (Ag), tin (Sn), gold (Au), nickel (Ni), lead (Pb), titanium (Ti), chromium (Cr), molybdenum (Mo) or alloys thereof, but is not limited thereto. For example, the first coil pattern  211  may include a seed layer including copper (Cu) in contact with the substrate IL, and an electrolytic plating layer disposed on the seed layer and including copper (Cu). The scope of the invention is not limited thereto. 
     The insulating film IF is disposed between the coil portion  200  and the body  100 . The insulating layer IF may be formed by at least one of a vapor deposition method and a film lamination method. On the other hand, in the latter case, the insulating film IF may be a permanent resist in which the plating resist used in plating the coil portion  200  on the substrate IL remains in the final product, but is not limited thereto. The insulating layer IF may include an insulating material such as paraline, epoxy, or polyimide. 
     On the other hand, as illustrated in  FIG.  16   , also in this embodiment, the metal at the interface between the exposed surface of the first lead-out portion  231  exposed to the first surface  101  of the body  100  and the first electrode layer  310  is intermetallic compound  320 . 
     As set forth above, according to an embodiment, the bonding force between the body and the external electrode may be increased. 
     In addition, according to an embodiment, the component characteristics may be improved by reducing contact resistance between the lead-out portion and the external electrode. 
     While this disclosure includes detailed examples, it will be apparent to one of ordinary skill in the art that various changes in form and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed to have a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.