Patent Publication Number: US-2023154677-A1

Title: Electronic component

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     This application is a continuation patent application of U.S. patent application Ser. No. 17/469,164, filed on Sep. 8, 2021, which claims the benefit of priority to Korean Patent Application No. 10-2020-0168125, filed on Dec. 4, 2020, the disclosures of which are incorporated herein by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an electronic component. 
     BACKGROUND 
     A multilayer capacitor has been used in various electronic devices as a multilayer capacitor has a small size and may be implemented with high capacity. 
     Recently, with the rapid development of eco-friendly vehicles and electrical vehicles, vehicles may have an increasing number of power driving systems, and demand for a multilayer capacitor required for vehicles has also increased. 
     To be used as a component for a vehicle, a high level of thermal reliability, electrical reliability, and mechanical reliability may be required. Accordingly, performance required for a multilayer capacitor has increased, and a structure of a multilayer capacitor having strong resistance against vibrations and deformation may be necessary. 
     As a method for improving durability against vibrations and deformation, an electronic component having a structure in which a multilayer capacitor is mounted at a predetermined distance from a board using a metal frame has been used. 
     However, in an electronic component using a general metal frame, as a height of being spaced apart from a board has been increased to improve durability such as warpage strength, equivalent series inductance (ESR) may increase. Also, the increase in thickness of a multilayer capacitor increases may not be suitable for the trend of miniaturization of chips. 
     Thus, it may be necessary to devise a technique for an electronic component which may improve durability such as warpage strength by maintaining a mounting height of the electronic component using a metal frame to be low and also effectively reducing stress transmitted from a mounting board to a multilayer capacitor. 
     SUMMARY 
     An aspect of the present disclosure is to provide an electronic component which may maintain a low mounting height of the electronic component using a metal frame and may improve durability such as warpage strength. 
     According to an aspect of the present disclosure, an electronic component includes a multilayer capacitor including a body and an external electrode disposed externally on the body; a metal frame bonded to the multilayer capacitor; and an adhesive layer disposed between the external electrode and the metal frame and including a solder layer and a conductive resin layer. 
     According to another aspect of the present disclosure, an electronic component includes a multilayer capacitor including a body and first and second external electrodes disposed externally on the body and spaced apart from each other; first and second metal frames coupled to the first and second external electrodes of the multilayer capacitor, respectively; a first adhesive layer disposed between the first external electrode and the first metal frame and including a first solder layer and a first conductive resin layer; and a second adhesive layer disposed between the second external electrode and the second metal frame and including a second solder layer and a second conductive resin layer. 
     According to still another aspect of the present disclosure, an electronic component includes a multilayer capacitor including a body and an external electrode disposed externally on the body; a metal frame bonded to the multilayer capacitor; and an adhesive layer disposed between the external electrode and the metal frame and including a conductive resin layer. A length of the conductive resin layer is less than a length of the adhesive layer. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a perspective diagram illustrating a multilayer capacitor according to an example embodiment of the present disclosure; 
         FIGS.  2 A and  2 B  are plan diagrams illustrating each of first and second internal electrodes included in a multilayer capacitor; 
         FIG.  3    is a cross-sectional diagram taken along line I-I′ in  FIG.  1   ; 
         FIG.  4    is a perspective diagram illustrating an electronic component in which a metal frame is bonded to a multilayer capacitor in  FIG.  1   ; 
         FIG.  5    is a cross-sectional diagram taken along line II-II′ in  FIG.  4   ; 
         FIGS.  6 A and  6 B  are graphs illustrating changes in warpage strength properties by varying a ratio between a solder layer and a conductive resin layer (epoxy) included in an electronic component; and 
         FIGS.  7 A and  7 B  are graphs illustrating changes in ESR properties by varying a ratio between a solder layer and a conductive resin layer (epoxy) included in an electronic component. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the present disclosure will be described as follows with reference to the attached drawings. 
     The present disclosure may, however, be exemplified in many different forms and should not be construed as being limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Shapes and sizes of elements in the drawings may be exaggerated for clarity of description, and elements indicated by the same reference numeral are same elements in the drawings. 
     Also, it will be understood that when a portion “includes” an element, it may further include another element, not excluding another element, unless otherwise indicated. 
     As for the directions to clearly describe an example embodiment, X, Y, and Z in the drawings represent a length direction, a width direction, and a thickness direction of a multilayer capacitor, respectively. 
     Also, in example embodiments, a length direction may be an X direction or a first direction, a width direction may be a Y direction or a second direction, and the thickness direction may be a Z direction, a third direction, or a stacking direction. 
     Electronic Component 
       FIG.  1    is a perspective diagram illustrating a multilayer capacitor according to an example embodiment.  FIGS.  2 A and  2 B  are plan diagrams illustrating each of first and second internal electrodes included in a multilayer capacitor.  FIG.  3    is a cross-sectional diagram taken along line I-I′ in  FIG.  1   . 
     In the description below, a structure of a multilayer capacitor  100  applied to an electronic component according to an example embodiment will be described with reference to  FIGS.  1  to  3   . 
     The multilayer capacitor  100  in the example embodiment may include a body  110  and external electrodes  131  and  132  disposed externally on the body  110 . 
     The body  110  may be formed by alternately laminating the plurality of dielectric layers  111  in the Z direction. Boundaries between the dielectric layers  111  adjacent to each other may be integrated such that it may be difficult to identify the boundaries without using a scanning electron microscope (SEM). 
     The body  110  may include a plurality of dielectric layers  111  and internal electrodes  121  and  122  stacked with the dielectric layers  111  interposed therebetween. 
     The body  110  may include an active region contributing to the formation of a capacitance of the capacitor, and cover regions  112  and  113  arranged above and below the active region in the Z direction as margin portions. 
     A shape of the body  110  is not limited to any particular shape, and may a hexahedral shape. The body  110  may include first and second surfaces  1  and  2  opposing each other in the Z direction, third and fourth surfaces  3  and  4  connected to the first and second surfaces  1  and  2  and opposing each other in the X direction, and fifth and sixth surfaces  5  and  6  connected to the first to fourth surfaces  1 ,  2 ,  3 , and  4  and opposing each other in the Y direction. 
     The dielectric layer  111  may include ceramic powder, BaTiO 3  ceramic powder, for example. 
     The BaTiO 3  ceramic powder may be (Ba 1-x Ca x ) TiO 3 , Ba (Ti 1-y Ca y ) O 3 , (Ba 1-x Ca x ) (Ti 1-y Zr y ) O 3  or Ba (Ti 1-y Zr y ) O 3  in which Ca or Zr is partially solid-solute in BaTiO 3 , but an example embodiment thereof is not limited thereto. 
     The dielectric layers  111  may further include ceramic additives, organic solvents, plasticizers, binders, and dispersants in addition to the ceramic powder. 
     The ceramic additive may include, for example, a transition metal oxide or a transition metal carbide, a rare earth element, magnesium (Mg) or aluminum (Al). 
     The internal electrodes  121  and  122  may include a first internal electrode  121  and a second internal electrode  122  having different polarities. The first and second internal electrodes  121  and  122  may be formed on the dielectric layer  111  and may be stacked in the Z direction, and may be alternately disposed in the body  110  with the dielectric layer  111  interposed therebetween in the Z direction to oppose each other. 
     In this case, the first and second internal electrodes  121  and  122  may be electrically insulated from each other by the dielectric layer  111  disposed therebetween. 
     In the example embodiment, the structure in which the internal electrodes are stacked in the Z direction is illustrated, but an example embodiment thereof is not limited thereto. The example embodiment may also be applied to a structure in which the internal electrodes are stacked in the Y direction if desired. 
     One ends of the first and second internal electrodes  121  and  122  may be exposed through the third and fourth surfaces  3  and  4  of the body  110 , respectively. 
     The ends of the first and second internal electrodes  121  and  122  alternately exposed through the third and fourth surfaces  3  and  4  of the body  110  may be electrically connected to the first and second external electrodes  131  and  132  disposed on both ends of the body  110  in the X direction. 
     Accordingly, when a predetermined voltage is applied to the external electrodes  131  and  132 , electric charges may be accumulated between the first and second internal electrodes  121  and  122 . 
     In this case, capacitance of the multilayer capacitor  100  may be proportional to an area of overlap between the first and second internal electrodes  121  and  122  overlapping each other in the Z direction in the active region. 
     A material for forming the internal electrodes  121  and  122  is not limited to any particular material, and may be formed using a conductive paste formed of at least one of a noble metal material or nickel (Ni) and copper (Cu). 
     As a method of printing the conductive paste, a screen printing method or a gravure printing method may be used, and an example embodiment thereof is not limited thereto. 
     The external electrodes  131  and  132  may include a first external electrode  131  and a second external electrode  132  disposed on both end surfaces of the body  110  in the X direction, respectively. The first and second external electrodes  131  and  132  may be provided with voltages of different polarities, and may be electrically connected to the exposed ends of the first and second internal electrodes  121  and  122 , respectively. 
     The first external electrode  131  may include a first head portion  131   a  and a first band portion  131   b.    
     The first head  131   a  may be disposed on the third surface  3  of the body  110  and may be in contact with the end of the first internal electrode  121  exposed through the third surface  3  of the body  110 . The first head  131   a  may electrically connect the first internal electrode  121  to the first external electrode  131 . 
     The first band portion  131   b  may extend from the first head portion  131   a  to a portion of the first, second, fifth and sixth surfaces  1 ,  2 ,  5 , and  6  of the body  110  to improve adhesion strength. 
     The second external electrode  132  may include a second head portion  132   a  and a second band portion  132   b.    
     The second head  132   a  may be disposed on the fourth surface  4  of the body  110  and may be in contact with the end of the second internal electrode  122  exposed through the fourth surface  4  of the body  110 . The second head  132   a  may electrically connect the second internal electrode  122  to the second external electrode  132 . 
     The second band portion  132   b  may extend to a portion of the first, second, fifth and sixth surfaces  1 ,  2 ,  5 , and  6  of the body  110  in the second head portion  132   a  to improve the adhesion strength 
     In the example embodiment, the external electrodes  131  and  132  may be formed of a sintered electrode including at least one metal component selected from among copper (Cu), nickel (Ni), and the like. 
     Also, at least one plating layer may be additionally formed on a surface of the external electrodes  131  and  132 . In this case, the plating layer may include a nickel (Ni) plating layer covering the surfaces of the external electrodes  131  and  132  and a tin (Sn) plating layer covering the nickel plating layer. 
       FIG.  4    is a perspective diagram illustrating an electronic component in which a metal frame is bonded to a multilayer capacitor in  FIG.  1   .  FIG.  5    is a cross-sectional diagram taken along line II-II′ in  FIG.  4   . 
     Referring to  FIGS.  4  and  5   , the electronic component  101  in the example embodiment may include a multilayer capacitor  100 , metal frames  140  and  150  bonded to the multilayer capacitor  100 , and adhesive layers  160  and  170  disposed between the external electrodes  131  and  132  and the metal frame  140  and  150 . 
     The metal frames  140  and  150  may include support portions  141  and  151  bonded to the external electrodes  131  and  132  and extending to one direction in the stacking direction (Z direction) of the internal electrodes  121  and  122 , and mounting portions  142  and  152  extending in the first direction (X direction) to oppose one surface of the body  110  on one ends of the extended support portions  141  and  151 . 
     The support portions  141  and  151  may be formed perpendicular to the mounting surface, and may be bonded to and electrically and physically connected to the first and second head portions  131   a  and  132   a  of the first and second external electrodes  131  and  132 , respectively. As an example, referring to  FIGS.  4  to  5   , the support portions  141  and  151  may include a region bonded to the head portions  131   a  and  132   a  of the external electrodes  131  and  132 , and a region extending to one direction in the Z direction and connected to the mounting portions  142  and  152 . 
     A shape of the support portions  141  and  151  is not limited to any particular shape, and may have a rectangular shape protruding further than the head portions  131   a  and  132   a  to one direction in the Z direction as illustrated in the diagram. 
     Also, a length of the support portions  141  and  151  in the Y direction is not limited to any particular example, and may be configured to be similar to the length of the head portions  131   a  and  132   a  in the Y direction as illustrated in the diagram. When the area of the support portions  141  and  151  is excessively large, the configuration may not suitable for the trend of miniaturization of electronic components, whereas when the area of the support portions  141  and  151  is excessively small, adhesion with the external electrodes  131  and  132  and durability during mounting may be insufficient. 
     The mounting portions  142  and  152  may extend in the X direction to oppose the first surface  1  of the body  110  on one ends of the support portions  141  and  151 . The mounting portions  142  and  152  may be formed horizontally with respect to the mounting surface, and may work as connection terminals when being mounted on a board. 
     As an example, as illustrated in  FIGS.  4  and  5   , the mounting portions  142  and  152  may extend towards the second head portion  132   a  and the first head portion  131   a  in the first direction (X direction). In this case, the mounting portions  142  and  152  may be disposed to be spaced apart from the band portions  131   b  and  132   b  of the external electrodes  131  and  132  and the first surface  1  of the body  110 . 
     A length in which the mounting portions  142  and  152  extend in the X direction is not limited to any particular example. For example, as illustrated in  FIG.  5   , the length may be configured to be longer than the area of the band portions  131   b  and  132   b  formed on the first surface  1  of the body  110 . However, an example embodiment thereof is not limited thereto, and the length may be varied within a range in which the mounting portions  142  and  152  extending in the first direction are spaced apart from each other. 
     The metal frames  140  and  150  may include a first metal frame  140  bonded to the first external electrode  131  of the multilayer capacitor  100  and a second metal frame  150  bonded to the second external electrode  132 . 
     The first metal frame  140  may include a first support portion  141  bonded to the first head portion  131   a  of the first external electrode  131  and a first mounting portion  142  extending from one end of the first support portion  141  in the first direction toward the second head portion  132   a.    
     The second metal frame  150  may include a second support portion  151  bonded to the second head portion  132   a  of the second external electrode  132 , and a second mounting portion  152  extending from one end of the second support portion  151  in the first direction toward the first head portion  131   a.    
     Adhesive layers  160  and  170  may be disposed between the external electrodes  131  and  132  and the support portions  141  and  151  of the metal frames  140  and  150 , and the adhesive layers  160  and  170  may include solder layers  161  and  171  and conductive resin layers  162  and  172 . 
     The adhesive layers  160  and  170  may bond and fasten the external electrodes  131  and  132  to the metal frames  140  and  150 . Also, when the electronic component  101  is mounted on a printed circuit board, the adhesive layers  160  and  170  may electrically connect the external electrodes  131  and  132  to electrode pads of the printed circuit board. 
     The adhesive layers  160  and  170  may include a first adhesive layer  160  for bonding the first external electrode  131  to the first metal frame  140 , and a second adhesive layer  170  for bonding the second external electrode  132  to the second metal frame  150 . Accordingly, the first and second adhesive layers  160  and  170  may exhibit the same polarities as those of the first and second external electrodes  131  and  132 , respectively. 
     The first adhesive layer  160  may include a first solder layer  161  and a first conductive resin layer  162 , and the second adhesive layer  170  may include a second solder layer  162  and a second conductive resin layer  172 . 
     In the case of an electronic component including a general metal frame, only solder may be used as a member for bonding the external electrode to the metal frame, which may exhibit limitations in terms of durability and ESR of the electronic component. 
     In other words, in the case in which the external electrode is bonded to the metal frame using only solder, when the electronic component is mounted on the board, external forces such as vibration transmitted from a board to the metal frame may not be absorbed by the solder, such that the external forces may be transmitted to the multilayer capacitor. Accordingly, durability such as warpage strength of the multilayer capacitor may be deteriorated, and the external electrode may be separated from the metal frame due to the external forces. 
     To compensate for the durability, generally, a leg length (mounting height) of the metal frame may be increased to effectively absorb external forces such as vibration. However, in this case, an area occupied by the electronic component may increase when the electronic component is mounted, which may not be suitable for the trend of miniaturization, and as the mounting height increases, ESR may also increase. 
     In the electronic component  101  in an example embodiment, the adhesive layers  160  and  170  may be formed such that the solder layers  161  and  171  and the conductive resin layers  162  and  172  may be disposed together. Accordingly, the mounting height of the electronic component  101  may be maintained to be low, and durability such as warpage strength may improve. 
     Specifically, by disposing the conductive resin layers  162  and  172  having elasticity greater than that of solder below the solder layers  161  and  171 , external forces such as vibration transmitted from the board to the multilayer capacitor  100  may be absorbed by the adhesive layer  160  and  170  and may be reduced. Accordingly, it may not be necessary to excessively increase a spacing distance (mounting height) between the mounting portions  142  and  152  of the metal frames  140  and  150  and the body  110 , such that durability such as warpage strength may improve and ESR may be maintained to be low. 
     Further, in the example embodiment, the conductive resin layers  162  and  172  may be disposed to be more adjacent to the mounting portions  142  and  152  than the solder layers  161  and  171 . Among bonding interfacial surfaces between the head portions  131   a  and  132   a  and the support portions  141  and  151 , the conductive resin layers  162  and  172  may be disposed in a lower region more adjacent to the mounting surface of the electronic component  101 , and the solder layers  161  and  171  may be disposed in an upper region spaced apart from the mounting surface of the electronic component  101 . 
     Accordingly, the solder layers  161  and  171  may bond and fasten the external electrodes  131  and  132  and the metal frames  140  and  150  in the upper region of the bonding interface, such that the solder layers  161  and  171  may maintain the bonding structure against external forces such as vibrations or impacts. 
     Also, the conductive resin layer  162  and  172  may be disposed in the lower region of the bonding interfacial surface between the external electrodes  131  and  132  and the metal frame  140  and  150 , the region which firstly receives vibrations or the like, such that the conductive resin layer  162  and  172  may partially absorb the vibrations by elasticity and flexibility, and may reduce vibrations transmitted to the solder layers  161  and  171  and the body  110 . 
     Referring to  FIGS.  4  and  5   , one ends of the solder layers  161  and  171  may be bonded to one ends of the conductive resin layer  162  and  172 , respectively. In other words, lower ends of the first and second solder layers  161  and  171  and upper ends of the first and second conductive resin layers  162  and  172  may be bonded to each other, respectively, and may form the first and second adhesive layers  160  and  170  as a whole. 
     As described above, when the solder layers  161  and  171  and the conductive resin layers  162  and  172  are bonded to each other, the adhesive layers  160  and  170  may be formed without an empty space with respect to the entire region of the head portions  131   a  and  132   a  of the external electrodes  131  and  132 , such that bonding force between the metal frames  140  and  150  and the external electrodes  131  and  132  may improve. 
     Also, the solder layers  161  and  171  and the conductive resin layers  162  and  172  may be disposed to not overlap each other in the first direction (X direction). In other words, in a space between the external electrodes  131  and  132  and the metal frames  140  and  150 , the two layers may be bonded and disposed side by side without overlapping each other. 
     As described above, when the solder layers  161  and  171  and the conductive resin layers  162  and  172  are disposed to not overlap each other, the possibility that the solder layers  161  and  171  and the conductive resin layers  162  and  172  having different physical properties are diffused and react with each other in the manufacturing process may decrease. Also, a decrease in bonding force caused by repulsive force between different materials may be prevented. 
     The solder layers  161  and  171  and the conductive resin layers  162  and  172  may be configured to have the same length in the first direction (X direction) in the space between the external electrodes  131  and  132  and the metal frames  140  and  150 . In other words, thicknesses of the coating on the surfaces of the head portions  131   a  and  132   a  may be the same. 
     In this case, with respect to the entire region of the head portions  131   a  and  132   a  on which the solder layers  161  and  171  and the conductive resin layers  162  and  172  are disposed, the spacing distances between the external electrodes  131  and  132  and the metal frame  140  and  150  may be maintained to be the same. 
     Also, the solder layers  161  and  171  and the conductive resin layers  162  and  172  may be configured to have the same length in the second direction (Y direction) in the space between the external electrodes  131  and  132  and the metal frames  140  and  150 . In other words, widths of the coating on the surfaces of the head portions  131   a  and  132   a  in the Y direction may be the same. 
     In this case, with respect to the entire region of the head portions  131   a  and  132   a  on which the solder layers  161  and  171  and the conductive resin layers  162  and  172  are disposed, the adhesive layers  140  and  150  may be arranged without forming an empty space between the external electrodes  131  and  132  and the metal frames  140  and  150 . 
     Also, in the example embodiment, when the solder layers  161  and  171  and the conductive resin layers  162  and  172  are configured to have the same length in the first and second directions, a volume ratio between the solder layers  161  and  171  and the conductive resin layers  162  and  172  may be the same as a length ratio in the stacking direction (Z direction). 
     Therefore, the example embodiment of the length ratio of the solder layers  161  and  171  and the conductive resin layers  162  and  172  in the stacking direction may also be applied to the volume ratio (content ratio) of the solder layers  161  and  171  and the conductive resin layers  162  and  172 . 
     The solder layers  161  and  171  may include solders formed of various materials, and may be formed of components such as low-ductility lead (Pb) or no-ductility lead (Pb) and tin (Sn). The molten solder may be applied to regions between the external electrodes  131  and  132  and the metal frames  140  and  150 , and may be cured, thereby forming the solder layers  161  and  171 . 
     The solder layers  161  and  171  may be disposed in an upper portion spaced apart from the mounting surface in the head portions  131   a  and  132   a , such that upper regions of the bonding interfacial surfaces between the external electrodes  131  and  132  and the metal frames  140  and  150  may be bonded and fastened to each other. Also, since components such as Pb and Sn have conductivity, the external electrodes  131  and  132  and the metal frames  140  and  150  may be electrically connected to each other. 
     The conductive resin layers  162  and  172  may include a conductivity imparting agent and resin. 
     The conductivity imparting agent may include at least one selected from among a conductive metal, a conductive polymer, and carbon. 
     The conductive metal is not limited to any particular material, and may include one or more selected from a group consisting of Ni (nickel), Cu (copper), and alloys thereof, for example. Carbon may include components such as graphite, CNT, and graphene. 
     The above-described conductivity imparting agent is merely an example, and any material having conductivity which may allow the external electrodes  131  and  132  and the metal frames  140  and  150  to be electrically connected to each other may be used. 
     The resin included in the conductive resin layers  162  and  172  may include a thermosetting resin, and may correspond to, for example, epoxy. Also, the epoxy may be a bisphenol-A (BPA) epoxy, a novolac epoxy, or the like. 
     The conductive resin layers  162  and  172  may be disposed in the lower portion adjacent to the mounting surface in the head portions  131   a  and  132   a , such that elasticity and flexibility of the lower region of the bonding interface between the external electrodes  131  and  132  and the metal frames  140  and  150  may improve. In other words, when the electronic component  101  is mounted on a printed circuit board, the conductive resin layers  162  and  172  may partially absorb external forces such as vibrations or impacts transmitted from the printed circuit board, such that external stress transmitted to the body  110  may be reduced. 
     Also, since the conductive resin layers  162  and  172  include a conductivity imparting agent, the external electrodes  131  and  132  and the metal frames  140  and  150  may be electrically connected to each other. Accordingly, the entire bonding layers  160  and  170  including the solder layers  161  and  171  and the conductive resin layers  162  and  172  may work as a conductive bonding material. 
     Experimental Example 
       FIGS.  6 A and  6 B  are graphs illustrating changes in warpage strength properties by varying a ratio between a solder layer and a conductive resin layer (epoxy) included in an electronic component.  FIGS.  7 A and  7 B  are graphs illustrating changes in ESR properties by varying a ratio between a solder layer and a conductive resin layer (epoxy) included in an electronic component. 
     In  FIGS.  6  to  7   , an experiment was performed by specifying the resin included in the conductive resin layers  162  and  172  as epoxy. Also, a ratio of epoxy illustrated in each graph indicates a ratio of a volume (content) of the conductive resin layers  162  and  172  to a total volume (content) of the solder layers  161  and  162  and the conductive resin layers  162  and  172 . 
     In the example embodiment, lengths of the solder layers  161  and  162  and the conductive resin layers  162  and  172  in the X and Y directions were configured to be the same, and accordingly, the ratio of epoxy illustrated in each graph may indicate a ratio of a length (T2) of the conductive resin layers  162  and  172  to a total length (T1+T2) of the adhesive layers  160  and  170  illustrated in  FIG.  5    in the stacking direction (Z direction), which may be T2/(T1+T2)*100. 
     Referring to  FIGS.  6 A and  6 B , it is indicated that, as the ratio of the conductive resin layer including epoxy increased, warpage strength increased. 
     As for warpage strength of the electronic component,  30  sample chips were prepared for each test number (epoxy ratio of 0, 25, 50, 75 and 100%), a sample chip (MLCC) was mounted on the board (PCB), and a maximum length at which a crack occurs in the body while an opposite surface of the sample chip (MLCC) was pressed was represented by a peak value. 
       FIG.  6 A  is a graph illustrating a result value of when a vertical distance D between the mounting surface of the mounting portion  142  and  152  illustrated in  FIG.  5    and the first surface  1  of the body  110  was 0.5 mm.  FIG.  6 B  is a graph illustrating a result value of when the vertical distance D between the mounting surface of the mounting portion  142  and  152  illustrated in  FIG.  5    and the first surface  1  of the body  110  was 1 mm. 
     Referring to  FIGS.  6 A and  6 B , as compared to an adhesive layer including only a solder layer (epoxy ratio of 0%), a peak value of warpage strength was high in the adhesive layer (epoxy ratio of 25, 50, 75, and 100%) including both the solder layer and the conductive resin layer. In other words, in the experimental example, when the adhesive layer includes 25% or more of the conductive resin layer, warpage strength of the electronic component improved. 
     Also, referring to  FIGS.  6 A and  6 B , as the ratio of the conductive resin layer containing epoxy increased, the peak value of warpage strength increased. In other words, it is indicated that, as the ratio of the conductive resin layer increased between the adhesive layers (epoxy ratio of 25, 50, 75, and 100%) including both the solder layer and the conductive resin layer, warpage strength of the electronic component was high. 
     A generally required guaranteeing peak value for warpage strength of an MLCC in the related technical field may be about 6 mm. Therefore, as illustrated in  FIG.  6 A , when the vertical distance D between the mounting surfaces of the mounting portions  142  and  152  and the first surface  1  of the body  110  is 0.5 mm, and the ratio of the conductive resin layer is 25% or more, warpage strength of the electronic component may almost satisfy the guaranteeing peak value. 
     In other words, when the adhesive layer is formed by configuring the solder layer and the conductive resin layer in a ratio of 75:25, as illustrated in  FIG.  6 B , an effect of improve warpage strength similar to the example in which the vertical distance D between the mounting surfaces of the mounting portions  142  and  152  and the first surface  1  of the body  110  is 1 mm and the adhesive layer which does not include the adhesive layer is formed may be obtained. 
     According to an example embodiment, by disposing both the solder layers  161  and  171  and the conductive resin layers  162  and  172  between the external electrodes  131  and  132  and the metal frames  140  and  150 , durability such as warpage strength may improve while the mounting height of the electronic component  101  is maintained to be low. 
     Also, in the electronic component  101  in an example embodiment, when a length of the solder layers  161  and  171  in the stacking direction (Z direction) of the internal electrodes  121  and  122  is defined as T1, and a length of the conductive resin layers  162  and  172  is defined as T2, T1 and T2 may satisfy 0.25≤T2/(T1+T2)&lt;1. 
     By limiting the length ratio (volume ratio) in the stacking direction of the solder layers  161  and  171  and the conductive resin layers  162  and  172  as above, warpage strength of the electronic component  101  may improve to be higher than a generally required guaranteeing peak for warpage strength of an MLCC. 
     In comparison between  FIGS.  6 A and  6 B , overall warpage strength was high when vertical distance (D) between the mounting surface of the mounting portion  142  and  152  and the first surface  1  of the body  110  was 1 mm, rather than 0.5 mm, which may indicate that, as the mounting height increases by elongating the leg length of the metal frame, durability such as warpage strength of the electronic component may improve. 
     However, when the mounting height of the electronic component is increased to improve durability as above, ESR of the electronic component may also increase as illustrated in  FIGS.  7 A and  7 B . 
     Referring to  FIGS.  7 A and  7 B , it is indicated that ESR of the electronic component may increase as the ratio of the conductive resin layer including epoxy increases. 
     An ESR measurement value of each electronic component was obtained by a generally used method in the technical field, and may be a result of measurement using an LCR meter. 
       FIG.  7 A  is a graph illustrating a result value of when the vertical distance (D) between the mounting surface of the mounting portion  142  and  152  illustrated in  FIG.  5    and the first surface  1  of the body  110  was 0.5 mm.  FIG.  6 B  is a graph illustrating a result value of when the vertical distance D between the mounting surface of the mounting portions  142  and  152  and the first surface  1  of the body  110  was 1 mm. 
     In comparison between  FIGS.  7 A and  7 B , overall ESR was high when vertical distance (D) between the mounting surface of the mounting portion  142  and  152  and the first surface  1  of the body  110  was 1 mm, rather than 0.5 mm, which may indicate that, as the mounting height increases by elongating the leg length of the metal frame, there may be a limitation in the increase of ESR of the electronic component. 
     Referring to  FIGS.  7 A and  7 B , the ESR value was high when the adhesive layer (epoxy ratio of 25, 50, 75, and 100%) including both the solder layer and the conductive resin layer was used, as compared to the adhesive layer including only the solder layer (epoxy ratio 0%). 
     Also, the ESR value appeared high as the ratio of the conductive resin layer increased between the adhesive layers (epoxy ratio of 25, 50, 75, and 100%) including both the solder layer and the conductive resin layer. 
     That is, when an adhesive layer including the conductive resin layer was used, an effect of improving warpage strength may be obtained, but ESR may also increase. Thus, it may be necessary to appropriately adjust the ratio of the solder layer and the conductive resin layer forming the adhesive layer. 
     In this case, a generally required ESR value of an MLCC in the related technical field to which the present disclosure belongs may be less than 10 mΩ. Therefore, as illustrated in  FIG.  7 A , when the vertical distance D between the mounting surfaces of the mounting portions  142  and  152  and the first surface  1  of the body  110  is 0.5 mm, and the ratio of the conductive resin layer is 75% or less, the ESR value of the electronic component may be 10 mΩ or less. 
     Similarly, as illustrated in  FIG.  7 B , it is indicated that, even when the vertical distance D between the mounting surfaces of the mounting portions  142  and  152  and the first surface  1  of the body  110  is 1 mm, and the ratio of the conductive resin layer is 75% or less, the ESR value of the electronic component may be around 10 mΩ. 
     In other words, when the vertical distance between one surface of the body  110  opposing one surface of the mounting portions  142  and  152  and the other surface of the mounting portions  142  and  152  is 0.5 mm or more and less than 1 mm, and the ratio of the conductive resin layer is adjusted to be 75% or less, the ESR value of MLCC may satisfy 10 mΩ or less. 
     Accordingly, in the electronic component  101  in an example embodiment, when the length of the solder layers  161  and  171  in the stacking direction (Z direction) of the internal electrodes  121  and  122  is defined as T1, and the length of the conductive resin layers  162  and  172  is defined as T2, T1 and T2 may satisfy 0.25≤T2/(T1+T2)≤0.75. 
     As described above, by limiting the length ratio (volume ratio) of the solder layers  161  and  171  and the conductive resin layers  162  and  172  taken in the stacking direction, warpage strength of the electronic component  101  may improve to be greater than a generally required guaranteeing peak for warpage strength of an MLCC, and the ESR value may be maintained to be 10 mΩ or less. 
     Also, when the adhesive layer is formed by configuring the vertical distance (D) between the mounting surface of the mounting portion  142  and  152  and the first surface  1  of the body  110  as illustrated in  FIG.  7 A  to be 0.5 mm, and configuring the conductive resin layer in a ratio of 25:75, the ESR measurement value similar to that of the example in which the vertical distance (D) between the mounting surface of the mounting portion  142  and  152  and the first surface  1  of the body  110  is 1 mm, and the adhesive layer without the conductive resin layer was formed may be obtained. 
     Thus, according to an example embodiment, by disposing both the solder layers  161  and  171  and conductive resin layers  162  and  172  between the external electrodes  131  and  132  and the metal frames  140  and  150 , ESR of the electronic component  101  may be maintained to be low, and durability such as warpage strength may improve. 
     According to the aforementioned example embodiment, the mounting height of electronic components using the metal frame may be reduced such that ESR may be reduced, and the space occupied by the multilayer capacitor on the mounting board may be reduced. 
     Also, elasticity in the adhesive layer between the external electrode and the metal frame may increase such that external stress, such as vibrations, transmitted from the board to the multilayer capacitor may be reduced, and durability such as warpage strength may improve. 
     While the example embodiments have been illustrated and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the scope in the example embodiment as defined by the appended claims.