Patent Publication Number: US-10770226-B2

Title: Composite electronic component, method of manufacturing the same, board for mounting thereof, and packaging unit thereof

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation patent application of U.S. patent application Ser. No. 15/652,999, filed on Jul. 18, 2017, which is a continuation patent application of U.S. patent application Ser. No. 14/521,116, filed on Oct. 22, 2014 which claims the benefit of Korean Patent Application No. 10-2014-0063094 filed on May 26, 2014, including the specification, drawings and Abstract is incorporated herein by reference in their entireties. 
    
    
     BACKGROUND 
     This disclosure relates to a composite electronic component including a plurality of passive devices, a method of manufacturing the same, a board for mounting thereof, and a packaging unit thereof. 
     Recently, in accordance with rapid development of the semiconductor industry, ultra-high integration of integrated circuits (ICs) for miniaturization of and improvements in levels of performance thereof has been attempted, and as such it has been somewhat difficult to address the problem of electrostatic discharge (ESD) in these ultra-miniaturized ICs. Therefore, a need to use an electrostatic discharge protection device in power and signal input terminals of such ICs has increased. 
     In accordance with the gradual increase in the data rates of portable products such as mobile phones, digital cameras, and personal digital assistants (PDA), high speed data lines, universal serial bus (USB) lines, high definition multimedia interface (HDMI) lines, and the like, countermeasures against electrostatic discharge (ESD) have increased in importance. 
     In addition, products such as vehicles, televisions (TV), and the like, require connectors for interconnecting connection cables between electronic boards. Since such connectors may be easily touched by a worker in a manufacturing process or by a device user, countermeasures against noise and ESD in such connectors are very important in order to improve product reliability. 
     As a component for preventing ESD, a multilayer ceramic capacitor (MLCC), a transient voltage suppression (TVS) diode, a varistor, an ESD suppressor, or the like, has been used alone or parallel connections of such components have been used. 
     In this case, an area in which components are disposed in an electronic apparatus is inevitably increased, which may limit the miniaturization of electronic apparatuses. 
     Further, it is difficult to secure electrical characteristics such as noise filtering characteristics, unique to MLCCs, in components other than MLCCs. Therefore, it is rare to use components other than MLCCs alone, except in the case of ultrahigh frequency communications terminals. 
     SUMMARY 
     Described herein are a composite electronic component capable of being mounted in a decreased area, a method of manufacturing the same, a board for mounting thereof, and a packaging unit thereof. 
     The composite electronic component, in accord with embodiments of this disclosure, comprises a capacitor having a body in which are located internal electrodes separated by dielectric material; an electrostatic discharge (ESD) protection device disposed on the body of the capacitor and having electrodes coupled to the internal electrodes of the capacitor, the ESD having a discharge part and first and second electrodes at opposite portions of the discharge part; and input and ground terminals coupled to the first and second electrodes of the ESD. 
     In some embodiments, the composite electronic component may more particularly include a composite body including a capacitor and an electrostatic discharge (ESD) protection device coupled to each other, the capacitor including a ceramic body in which a plurality of dielectric layers and internal electrodes disposed to face each other with a respective dielectric layer interposed therebetween are stacked, the ESD protection device including first and second electrodes disposed on the ceramic body, a discharging part disposed between the first and second electrodes, and a protective layer disposed on the first and second electrodes and the discharging part. 
     The ESD protection device may be disposed on a lower surface of the ceramic body. 
     In some embodiments, a composite electronic component may include a composite body in which a noise filter unit and an ESD protection device disposed below the noise filter unit coupled to each other, and an input terminal and a ground terminal are coupled to the composite body. The noise filter unit may filter a noise component of an input signal to the input terminal, and the ESD protection device may bypass any over-voltage above a rated voltage input to the input terminal. 
     According to some embodiments, a board for mounting of a composite electronic component may include a printed circuit board on which a plurality of electrode pads are disposed, the composite electronic component as described above installed on the printed circuit board, and solder connecting the electrode pads and the composite electronic component to each other. 
     According to some embodiments, a packaging unit of a composite electronic component may include the composite electronic components as described above disposed so that ESD protection devices thereof are directed toward bottom surfaces of receiving parts, and a packaging sheet having the receiving parts formed therein, the receiving parts receiving the composite electronic components therein. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features and other 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 transparent perspective view schematically illustrating a composite electronic component according to a first exemplary embodiment in the present disclosure; 
         FIG. 2  is a cross-sectional view taken along line A-A′ of  FIG. 1 ; 
         FIG. 3  is a perspective view schematically illustrating a composite electronic component according to a second exemplary embodiment in the present disclosure; 
         FIG. 4  is a cross-sectional view taken along line A-A′ of  FIG. 3 ; 
         FIG. 5  is an equivalent circuit diagram of the composite electronic component illustrated in  FIG. 3 ; 
         FIG. 6  is a perspective view schematically illustrating a composite electronic component according to a third exemplary embodiment in the present disclosure; 
         FIG. 7  is a cross-sectional view taken along line A-A′ of  FIG. 6 ; 
         FIG. 8  is a perspective view schematically illustrating a composite electronic component according to a fourth exemplary embodiment in the present disclosure; 
         FIG. 9  is a cross-sectional view taken along line A-A′ of  FIG. 8 ; 
         FIG. 10  is a view illustrating a signal interface through which signals are transferred from a connector to a system or an integrated circuit (IC); 
         FIG. 11  is a view illustrating a pattern for a layout of a device between a connector and a system or an IC; 
         FIG. 12  is a circuit diagram of the composite electronic component according to an exemplary embodiment in the present disclosure; 
         FIG. 13  is a view illustrating a device layout pattern in which the composite electronic components according to an exemplary embodiment in the present disclosure are used between a connector and a system or an IC; 
         FIG. 14  is a perspective view illustrating a manner in which the composite electronic component of  FIG. 8  is mounted on a printed circuit board; 
         FIG. 15  is a schematic perspective view illustrating a manner in which the composite electronic components of  FIG. 8  are mounted in a packaging unit; and 
         FIG. 16  is a schematic cross-sectional view illustrating a packaging unit of  FIG. 15  coiled in a coil shape. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, embodiments of the inventive concepts presented in this disclosure will be set forth in detail with reference to the accompanying drawings. The disclosure may, however, express inventive subject matter embodied in many different forms and should not be construed as being limited to the 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. In the drawings, the shapes and dimensions of elements may be exaggerated for clarity, and the same reference numerals will be used throughout to designate the same or like elements. 
     Composite Electronic Component 
     Hereinafter, exemplary embodiments in the present disclosure will be set forth in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view schematically illustrating a composite electronic component according to a first exemplary embodiment in the present disclosure. 
       FIG. 2  is a cross-sectional view taken along line A-A′ of  FIG. 1 . 
     In the composite electronic component according to an exemplary embodiment in the present disclosure, a ‘length direction’ refers to an ‘L’ direction of  FIG. 1 , a ‘width direction’ refers to a ‘W’ direction of  FIG. 1 , and a ‘thickness direction’ refers to a ‘T’ direction of  FIG. 1 . Here, the ‘thickness direction’ refers to a direction in which dielectric layers of a capacitor are stacked, for example, a ‘stacking direction’. 
     Meanwhile, the length direction, the width direction, and the thickness direction of the composite electronic component may be the same as those of a capacitor and an electrostatic discharge (ESD) protection device, as described below. 
     In addition, in an exemplary embodiment of the present disclosure, the composite electronic component may have upper and lower surfaces opposing each other, and first and second end surfaces connecting the upper and lower surfaces to each other in the length direction and third and fourth side surfaces connecting the upper and lower surfaces to each other in the width direction. The shape of the composite electronic component is not particularly limited, but may be a hexahedral shape as shown in the drawings. 
     In addition, the first and second end surfaces of the composite electronic component in the length direction and the third and fourth side surfaces thereof in the width direction may be the same as first and second end surfaces of a capacitor and an electrostatic discharge (ESD) protection device in the length direction and third and fourth side surfaces thereof in the width direction, respectively, as described below. 
     Meanwhile, the composite electronic component may have a form in which the capacitor and the ESD protection device are coupled to each other. In the case in which the ESD protection device is coupled to a lower portion of the capacitor, an upper surface of the composite electronic component refers to an upper surface of the capacitor, and a lower surface of the composite electronic component refers to a lower surface of the ESD protection device. 
     Referring to  FIGS. 1 and 2 , a composite electronic component  100  according to a first exemplary embodiment of the inventive concepts herein may include a composite body  130  including a capacitor  110  and an electrostatic discharge (ESD) protection device  120  coupled to each other, the capacitor  110  being configured of a ceramic body in which a plurality of dielectric layers  111  and internal electrodes  121  and  122  disposed so as to face each other with a respective dielectric layer  111  interposed therebetween are stacked; and the ESD protection device  120  including first and second electrodes  141  and  142  disposed on the ceramic body, a discharging part  140  disposed between the first and second electrodes  141  and  142 , and a protective layer  150  disposed on the first and second electrodes  141  and  142  and the discharging part  140 . 
     In the exemplary embodiment presented in the present disclosure, the composite body  130  may be formed by coupling the capacitor  110  and the ESD protection device  120  to each other. However, a method of forming the composite body  130  is not particularly limited. 
     For example, the composite body  130  may be formed by coupling the capacitor  110  and the ESD protection device  120 , separately manufactured, with a conductive adhesive, a resin, or the like, or may be formed by sequentially disposing the first and second electrodes  141  and  142 , the discharging part  140 , and the protective layer  150  on the ceramic body configuring the capacitor  110 , but is not particularly limited thereto. 
     According to the first exemplary embodiment in the present disclosure, the composite body  130  may be formed by sequentially disposing the first and second electrodes  141  and  142 , the discharging part  140 , and the protective layer  150  on the ceramic body configuring the capacitor  110 . 
     Hereinafter, the capacitor  110  and the ESD protection device  120  configuring the composite body  130  will be described in detail. 
     Referring to  FIG. 2 , the ceramic body configuring the capacitor  110  may be formed by stacking a plurality of dielectric layers  111 , and a plurality of internal electrodes  121  and  122  (first and second internal electrodes) may be disposed in the ceramic body so as to be spaced apart from each other with a respective dielectric layer interposed therebetween. 
     The plurality of dielectric layers  111  configuring the ceramic body  110  may be in a sintered state, and adjacent dielectric layers may be integrated, such that boundaries therebetween may not be readily apparent. 
     The dielectric layer  111  may be formed by sintering a ceramic green sheet containing a ceramic powder, an organic solvent, and an organic binder. The ceramic powder, a high k material, may be a barium titanate (BaTiO 3 )-based material, a strontium titanate (SrTiO 3 )-based material, or the like, but is not limited thereto. 
     Meanwhile, according to the first exemplary embodiment in the present disclosure, the internal electrodes may include first internal electrodes  121  exposed to a first end surface of the composite body  130  in the length direction and second internal electrodes  122  exposed to a second end surface thereof in the length direction, but are not limited thereto. 
     The first and second internal electrodes  121  and  122  may be formed using a conductive paste containing a conductive metal. 
     The conductive metal may be nickel (Ni), copper (Cu), palladium (Pd), or alloys thereof, but is not limited thereto. 
     The first and second internal electrodes  121  and  122  may be printed on the ceramic green sheets forming the dielectric layer  111 , using a conductive paste by a printing method such as screen printing or gravure printing. 
     The ceramic green sheets having the internal electrodes printed thereon may be alternately stacked and sintered to form the ceramic body. 
     The capacitor may serve to filter a low frequency noise component in a signal interface, an integrated circuit (IC) block, or a communications line. 
     According to the first exemplary embodiment in the present disclosure, the ESD protection device  120  may be formed by sequentially disposing the first and second electrodes  141  and  142 , the discharging part  140 , and the protective layer  150  on the ceramic body configuring the capacitor  110 . 
     Generally, as a component for preventing ESD, a multilayer ceramic capacitor (MLCC), an ESD suppressor, or the like, has been used alone or in a state in which such components are connected to each other in parallel. 
     According to the first exemplary embodiment in the present disclosure, the composite electronic component may include the capacitor  110  and the ESD protection device  120  coupled to each other. 
     The ESD protection device  120  may be an ESD suppressor, but is not limited thereto. 
     Since the ESD protection device  120  according to an exemplary embodiment in the present disclosure is the ESD suppressor, it may be different in terms of a structure and actions thereof from a varistor, due to the following reason. 
     According to the first exemplary embodiment in the present disclosure, the first and second electrodes  141  and  142  may be disposed on the same plane so as to face each other. 
     The varistor, a general electrical overstress (EOS) protection device, may include a zinc oxide as a raw material and have a form in which palladium (Pd) or silver (Ag) electrodes are stacked while facing each other in the stacking direction with the zinc oxide disposed therebetween. 
     However, according to the first exemplary embodiment in the present disclosure, the first and second electrodes  141  and  142  may be disposed on the same plane so as to face each other. 
     However, the first and second electrodes  141  and  142  are not limited thereto, but may be disposed so that they partially face each other in a thickness direction of the composite body  130 . 
     The first and second electrodes  141  and  142  may be formed using a conductive paste containing a conductive metal. 
     The conductive metal may be nickel (Ni), copper (Cu), palladium (Pd), or alloys thereof, but is not limited thereto. 
     According to the first exemplary embodiment in the present disclosure, the first and second electrodes  141  and  142  may be printed on the ceramic body using a conductive paste by a printing method such as screen printing method or a gravure printing method. 
     The discharging part  140  may include a conductive polymer, but is not limited thereto. 
     The conductive polymer may have characteristics of a non-conductor in the case in which a signal voltage input from a signal interface through which signals are transferred from a connector to a system or an integrated circuit (IC), an IC block of a power supply terminal, or a communications line corresponds to a rated voltage (circuit voltage) level, but may have characteristics of a conductor in the case in which an over-voltage such as ESD, or the like, is instantaneously generated. 
     The first and second electrodes  141  and  142  may be short-circuited due to the discharging part  140  having the characteristics of the conductor in the case of generation of an over-voltage such as ESD, or the like. 
     Therefore, the over-voltage such as ESD, or the like, may be bypassed to a ground through the ESD protection device  120 , such that the signal interface, the IC block, or the communications line may be protected. 
     The conductive polymer is not particularly limited, but may be, for example, a silicone-based resin. 
     According to the first exemplary embodiment in the present disclosure, since the discharging part  140  may include the conductive polymer, the silicone-based resin, the ESD protection device  120  needs to be coupled to an outer surface of the capacitor  110  and may not be disposed in the capacitor  110 . 
     The reason for this may be that the silicone based resin may be evaporated and removed in the case in which it is disposed in the capacitor since the silicone based resin has a boiling point significantly lower than a sintering temperature of the ceramic body required at the time of manufacturing the capacitor. 
     In addition, according to the first exemplary embodiment in the present disclosure, the ESD protection device  120  may bypass the over-voltage such as ESD, or the like, by the first and second electrodes  141  and  142  and the discharging part  140  disposed between the first and second electrodes  141  and  142 . However, the varistor may act as an insulator at a rated voltage and act as a variable resistor at the time of generation of the over-voltage to bypass the over-voltage. 
     According to the first exemplary embodiment in the present disclosure, the protective layer  150  may include an epoxy based resin. 
     In the ESD protection device  120 , the protective layer  150  may serve to protect the first and second electrodes  141  and  142  and the discharging part  140  disposed between the first and second electrodes  141  and  142  from an external environment, and material of the protective layer  150  is not particularly limited. 
     The protective layer  150  may include an epoxy based resin to protect the first and second electrodes  141  and  142  and the discharging part  140  disposed between the first and second electrodes  141  and  142  from an external environment. 
     Since the ESD protection device  120  is coupled to the outer surface of the capacitor  110 , the protective layer  150  may be a requisite component for protecting the ESD protection device  120  from an external environment. 
     The composite electronic component according to the first exemplary embodiment in the present disclosure may include an input terminal  131  disposed on the first end surface of the composite body  130  in the length direction and connected to the first internal electrodes  121  of the capacitor  110  and the first electrode  141  of the ESD protection device  120 , and a ground terminal  132  formed on the second end surface of the composite body  130  in the length direction and connected to the second internal electrodes  122  of the capacitor  110  and the second electrode  142 . 
     The input terminal  131  and the ground terminal  132  may be connected to the internal electrodes  121  and  122  of the capacitor  110 , such that the composite electronic component may serve to filter a noise component of an input signal. 
     In addition, the input terminal  131  and the ground terminal  132  may be connected to the first and second electrodes  141  and  142  of the ESD protection device  120 , respectively, such that the composite electrode component may bypass the over-voltage. 
     The input terminal  131  and the ground terminal  132  may be formed using a conductive paste containing a conductive metal. 
     The conductive metal may be nickel (Ni), copper (Cu), tin (Sn), or alloys thereof, but is not limited thereto. 
     The conductive paste may further contain an insulating material. The insulating material may be, for example, glass, but is not limited thereto. 
     A method of forming the input terminal  131  and the ground terminal  132  is not particularly limited. For example, the input terminal  131  and the ground terminal  132  may be formed by dipping the composite body or may be formed by a method such as a plating method, or the like. 
     In addition, although not shown, nickel/tin (Ni/Sn) plating layers formed by plating may be further disposed on outer portions of the input terminal  131  and the ground terminal  132 . 
       FIG. 3  is a transparent perspective view schematically illustrating a composite electronic component according to a second exemplary embodiment in the present disclosure. 
       FIG. 4  is a cross-sectional view taken along line A-A′ of  FIG. 3 . 
     Referring to  FIGS. 3 and 4 , in addition to features of the composite electronic component according to the first exemplary embodiment in the present disclosure, a composite electronic component according to a second exemplary embodiment in the present disclosure may have a form in which the ESD protection device  120  is disposed on a lower surface of the ceramic body of the capacitor  110 . 
     The ESD protection device  120  may be an ESD suppressor, but is not limited thereto. 
     Therefore, a phenomenon in which vibrations of the capacitor due to an inverse piezoelectric feature of the capacitor  110  are transferred to a board may be decreased to reduce acoustic noise. 
     A structure for reducing acoustic noise at the time of mounting the composite electronic component  100  on the board will be described in more detail. 
     In order to avoid overlapping descriptions, detailed descriptions of features of a composite electronic component  100  according to the second exemplary embodiment in the present disclosure, the same as those of the composite electronic component according to the first exemplary embodiment in the present disclosure described above will be omitted. 
       FIG. 5  is an equivalent circuit diagram of the composite electronic component shown in  FIG. 3 . 
     Referring to  FIG. 5 , in the composite electronic component according to an exemplary embodiment in the present disclosure, the capacitor  110  and the ESD protection device  120  may be coupled to each other, unlike in the case of the related art. Therefore, the capacitor  110  and the ESD protection device  120  may be designed so as to have a relatively shortest distance therebetween, whereby noise may be decreased. 
     In addition, the capacitor  110  and the ESD protection device  120  may be coupled to each other, such that a mounting area in the signal interface, the IC block, or the communications line is significantly decreased, excellent in terms of securing a mounting space. 
     In addition, costs required for mounting the composite electronic component may be decreased. 
       FIG. 6  is a perspective view schematically illustrating a composite electronic component according to a third exemplary embodiment in the present disclosure. 
       FIG. 7  is a cross-sectional view taken along line A-A′ of  FIG. 6 . 
     Referring to  FIGS. 6 and 7 , a composite electronic component  200  according to a third exemplary embodiment in the present disclosure may include a composite body  230  including a capacitor  210  and an ESD protection device  220  coupled to each other, the capacitor  210  including a ceramic body in which a plurality of dielectric layers  211  and a plurality of first and second internal electrodes  221  and  222  disposed so as to face each other with a respective dielectric layer  211  interposed therebetween are stacked, and the ESD protection device  220  including a substrate  270 , first and second electrodes  241  and  242  disposed below the substrate  270  and insulated from each other, a discharging part  240  disposed between the first and second electrodes  241  and  242 , and a protective layer  250  disposed below the first and second electrodes  241  and  242  and the discharging part  240 . 
     In addition, the composite electronic component  200  according to the third exemplary embodiment in the present disclosure may include a first external electrode  231   a  disposed on a first end surface of the ceramic body in the length direction and connected to the first internal electrodes  221  of the capacitor  210 , a second external electrode  232   a  disposed on a second end surface of the ceramic body in the length direction and connected to the second internal electrodes  222  of the capacitor  210 , a third external electrode  231   b  disposed on a first end surface of the ESD protection device  220  in the length direction and connected to the first electrode  241 , and a fourth external electrode  232   b  disposed on a second end surface of the ESD protection device  220  in the length direction and connected to the second electrode  242 . 
     In addition, the composite body  230  may include an input terminal  231  configured of the first and third external electrodes  231   a  and  231   b  coupled to each other and a ground terminal  232  configured of the second and fourth external electrodes  232   a  and  232   b  coupled to each other. 
     The ESD protection device  220  may be an ESD suppressor, but is not limited thereto. 
     The first external electrode  231   a  may be formed on the first end surface of the ceramic body in the length direction, but may also be extended to the third and fourth side surfaces of the ceramic body in the width direction and the upper and lower surfaces of the ceramic body. 
     The second external electrode  232   a  may be formed on the second end surface of the ceramic body in the length direction, but may also be extended to the third and fourth side surfaces of the ceramic body in the width direction and the upper and lower surfaces of the ceramic body. 
     The third external electrode  231   b  may be formed on the first end surface of the ESD protection device  220  in the length direction, but may also be extended to the third and fourth side surfaces of the ESD protection device  220  in the width direction and the upper and lower surfaces of the ESD protection device  220 . 
     The fourth external electrode  232   b  may be formed on the second end surface of the ESD protection device  220  in the length direction, but may also be extended to the third and fourth side surfaces of the ESD protection device  220  in the width direction and the upper and lower surface of the ESD protection device  220 . 
     The capacitor  210  and the ESD protection device  220  may be coupled to each other by a conductive adhesive  260 . 
     In the composite electronic component  200  according to the third exemplary embodiment of the present disclosure, since the capacitor  210  and the ESD protection device  220 , separately manufactured, are vertically coupled to each other, the conductive adhesive  260  may be applied onto coupled surfaces of the capacitor  210  and the ESD protection device  220  to couple the capacitor  210  and the ESD protection device  220  to each other. 
     The conductive adhesive  260  is not particularly limited, but may be, for example, a polymer paste containing silver (Ag). 
     According to the third exemplary embodiment in the present disclosure, at the time of vertically coupling the capacitor  210  and the ESD protection device  220 , separately manufactured, the first and second electrodes  241  and  242  and the discharging part  240  may be disposed so as to be spaced apart from the capacitor  210  as distant as possible. 
     For example, in the ESD protective layer  220  coupled to the capacitor  210 , the protective layer  250  may be disposed on the capacitor  210 , and the first and second electrodes  241  and  242  and the discharging part  240  may be disposed on the protective layer  250 . 
     Therefore, when the over-voltage such as ESD, or the like, is generated in a state in which the composite electronic component is mounted on the board, an effect of bypassing the over-voltage such as ESD, or the like, and protecting the capacitor  210  from the over-voltage through the first and second electrodes  241  and  242  and the discharging part  240  may be further improved. 
     However, the present disclosure is not limited thereto. For example, the first and second electrodes  241  and  242  and the discharging part  240  may also be disposed adjacent to the capacitor  210 . 
     In the composite electronic component  200  according to the third exemplary embodiment in the present disclosure, since the capacitor  210  and the ESD protection device  220  are separately manufactured and coupled to each other unlike an integrated structure according to the related art, a manufacturing process may be simple and there are no limitations in selecting materials. 
     In detail, since the capacitor  210  and the ESD protection device  220  are coupled to each other by the conductive adhesive  260 , when the over-voltage such as ESD, or the like, is instantaneously generated, the over-voltage may be bypassed through the ESD protection device  220 , such that influence of the over-voltage on the capacitor  210  may be significantly decreased. Therefore, the capacitor  210  may be protected. 
     For example, since the capacitor  210  and the ESD protection device  220 , separately manufactured, are coupled to each other by the conductive adhesive  260 , such that they are closely spaced apart from each other, the capacitor  210  may be protected from over-voltage such as ESD, or the like. 
     In addition, plating layers  233  formed by plating may be disposed on outer portions of the input terminal  231  and the ground terminal  232 . Here, the plating layer  233  is not particularly limited, but may be, for example, a nickel/tin (Ni/Sn) plating layer. 
     The plating layers  233  may protect the input terminal  231  configured of the first and third external electrodes  231   a  and  231   b  coupled to each other and the ground terminal  232  configured of the second and fourth external electrodes  232   a  and  232   b  coupled to each other and complement the external electrodes of the capacitor and the ESD protection device so as to be coupled to each other to perform functions of input and ground terminals. 
     The substrate  270  may be any substrate as long as the first and second electrodes  241  and  242  may be formed thereon. For example, the substrate  270  may be an alumina substrate. 
     In order to avoid an overlapping description, a detailed description of features of a composite electronic component  200  according to the third exemplary embodiment in the present disclosure, the same as those of the composite electronic component according to the first exemplary embodiment in the present disclosure described above will be omitted. 
       FIG. 8  is a transparent perspective view schematically illustrating a composite electronic component according to a fourth exemplary embodiment in the present disclosure. 
       FIG. 9  is a cross-sectional view taken along line A-A′ of  FIG. 8 . 
     Referring to  FIGS. 8 and 9 , in addition to features of the composite electronic component according to the third exemplary embodiment in the present disclosure, a composite electronic component  200  according to a fourth exemplary embodiment in the present disclosure may have a form in which the ESD protection device  220  is disposed on a lower surface of the ceramic body of the capacitor  210 . 
     The ESD protection device  220  may be an ESD suppressor, but is not limited thereto. 
     According to the fourth exemplary embodiment in the present disclosure, at the time of coupling the separately manufactured ESD protection device  220  to a lower surface of the ceramic body of the capacitor  210 , the first and second electrodes  241  and  242  and the discharging part  240  may be disposed so as to be spaced apart from the capacitor  210  by as large a distance as possible. 
     For example, in the ESD protection device  220  coupled to the capacitor  210 , the protective layer  250  may be disposed adjacently to the capacitor  210 , and the first and second electrodes  241  and  242  and the discharging part  240  may be disposed below the protective layer  250 . 
     Therefore, in the case in which an over-voltage such as ESD, or the like, is generated in a state in which the composite electronic component is mounted on the board, an effect of bypassing the over-voltage such as ESD, or the like, and protecting the capacitor  210  from the over-voltage through the first and second electrodes  241  and  242  and the discharging part  240  may be further improved. 
     However, the present disclosure is not limited thereto. For example, the first and second electrodes  241  and  242  and the discharging part  240  may also be disposed adjacently to the capacitor  210 . 
     The ESD protection device  220  may be disposed on the lower surface of the ceramic body of the capacitor  210  to decrease a phenomenon in which vibrations of the capacitor  210 , due to an inverse piezoelectric feature of the capacitor  210 , are transferred to the board, thereby decreasing acoustic noise. 
     A structure decreasing the acoustic noise at the time of mounting the composite electronic component  200  on the board will be described in more detail. 
     Meanwhile, a composite electronic component according to another exemplary embodiment in the present disclosure may include a composite body in which a noise filter unit and an ESD protection device disposed below the noise filter unit are coupled to each other; and an input terminal and a ground terminal coupled to the composite body, and the noise filter unit filters a noise component of an input signal input to the input terminal, and the ESD protection device bypasses an over-voltage input to the input terminal. 
     The composite electronic component according to another exemplary embodiment in the present disclosure will be described in more detail with the accompanying drawings. 
       FIG. 10  is a view illustrating a signal interface through which signals are transferred from a connector to a system or an integrated circuit (IC). 
     Referring to  FIG. 10 , the signal interface through which the signals are transferred from the connector to the system or the IC may include a connector  300  such as an output terminal Vdd, a signal unit Signals, or the like, a signal stabilizing unit  400 , and a system or an IC  500 . 
     The connector  300  may supply the signals to the signal stabilizing unit  400 . The signals may have a rated voltage and current and may be transferred to the system or the IC  500 . 
     The connector  300  may be the output terminal Vdd, a signal input and output terminal Signal+ and Signal−, or a ground terminal, but is not limited thereto. 
     The signal stabilizing unit  400  may include a noise filter unit filtering noise components in the signals input from the connector  300  and an ESD protection device bypassing an over-voltage. 
     In detail, the signal stabilizing unit  400  may include capacitors C 1  to C 3  filtering the noise components in the input signals and bypassing a portion of the over-voltage, and ESD protection devices E 1  to E 3 . 
     Although the case in which the number of capacitors C 1  to C 3  filtering the noise components in the input signals and bypassing a portion of the over-voltage, and the number of the ESD protection devices E 1  to E 3  are 3, respectively, has been shown in  FIG. 10 , the numbers of capacitors C 1  to C 3  and the ESD protection devices E 1  to E 3  are not limited thereto, but may be adjusted, as necessary. 
     In addition, the capacitors C 1  to C 3 , which serve to filter noise components and bypass a portion of the over-voltage, may be low-capacitance capacitors having a capacitance of 100 pF to 1 nF. 
     The capacitors C 1  to C 3  may bypass a portion of the over-voltage, and the majority of the over-voltage may be bypassed through the ESD protection devices E 1  to E 3 . 
     The signals input from the connector  300  pass through the stabilizing unit  400 , such that the noise component of the signals may be filtered and the over-voltage, or the like, that may be instantaneously generated may be bypassed. Then, the signals from which the noise components are filtered and of which the over-voltage, or the like, is bypassed may be transferred to the system or the IC  500 . 
       FIG. 11  is a view illustrating a device layout pattern between the connector and the system or the IC. 
     Referring to  FIG. 11 , disposition patterns of the connector  300  such as the output terminal Vdd, the signal unit Signals, or the like, the signal stabilizing unit  400 , and the system or the IC  500  may be confirmed. 
     Generally, the connector  300  such as the output terminal Vdd, the signal unit Signals, or the like, and the system or the IC  500  may include several capacitors to several tens of capacitors or several ESD protection devices to several tens of ESD protection devices disposed therebetween. 
     Referring to  FIG. 11 , the connector  300  such as the output terminal Vdd, the signal unit Signals, or the like, may have predetermined terminals N 1  and N 2 . The connector  300  such as the output terminal Vdd, the signal unit Signals, or the like, may supply power or the signals through the first and second terminals N 1  and N 2 . 
     Here, the capacitor C 1  may receive power or the signals through the first and second terminals N 1  and N 2 , stabilize the received power and signals, and transfer the stabilized power and signals to the system or the IC  500 . 
     In addition, the capacitor C 1  and the ESD protection device E 1  may bypass the over-voltage such as ESD, or the like, to a ground through a third terminal N 3 . 
     It needs to be importantly considered in designing patterns of the signal interface, the IC block, or the communications line that the capacitor, the ESD protection device, the IC, and the like, are to be disposed as closely to each other as possible. 
     The reason may be that the requirements as described above need to be satisfied in order to reduce the area of a component and suppress generation of noise. 
     In the case in which the capacitor and ESD protection device are disposed in a non-optimal state, the distance between the capacitor and ESD protection device and a power line may be increased, such that noise may occur. The noise may have a negative influence on the system or the IC. 
       FIG. 12  is a circuit diagram of the composite electronic component according to an exemplary embodiment in the present disclosure. 
     Referring to  FIG. 12 , the composite electronic component  400  may include an input terminal unit A (input terminal), a signal stabilizing unit, and a ground terminal unit B (ground terminal). 
     The signal stabilizing unit may include a capacitor C 1  and an ESD protection device E 1 . 
     The composite electronic component  400  may perform a function of the signal stabilizing unit described above. 
     The input terminal unit A may receive the signals from the connector  300  such as the output terminal Vdd, or the like. 
     The signal stabilizing unit may remove noise of the signals received from the input terminal unit A and bypass an over-voltage, or the like. 
     The ground terminal unit B may connect the signal stabilizing unit to a ground. 
     For example, the composite electronic component  400  may allow the capacitor and the ESD protection device provided between the connector  300  such as the output terminal Vdd, the signal unit Signals, or the like, and the system or the IC  500  to be implemented as a single component. Therefore, the degree of integration of devices may be improved due to the composite electronic component  400 . 
       FIG. 13  is a view illustrating a device layout pattern in which the composite electronic components according to an exemplary embodiment of the present disclosure are used between the connector and the system or the IC. 
     Referring to  FIG. 13 , it may be confirmed that the capacitors C 1  and C 2  and the ESD protection devices E 1  and E 2  shown in  FIG. 11  are replaced by the composite electronic components according to an exemplary embodiment in the present disclosure. 
     In addition, the composite electronic component may perform functions of the signal stabilizing unit such as filtering noise, bypassing an over-voltage such as ESD, and the like. 
     In addition, the capacitors C 1  and C 2  and the ESD protection devices E 1  and E 2  are replaced by the composite electronic components according to an exemplary embodiment in the present disclosure, whereby length of wiring may be significantly decreased. In addition, the number of devices disposed is decreased, whereby the devices may be properly disposed. 
     Meanwhile, electronic apparatus manufacturers have made an effort to reduce the size of a printed circuit board (PCB) included in an electronic apparatus in order to satisfy consumer demand. Therefore, it has been required to increase the degree of integration of ICs mounted on the PCB. As in the composite electronic component according to an exemplary embodiment in the present disclosure, a plurality of devices are implemented as a single composite component, whereby this demand may be satisfied. 
     Further, according to an exemplary embodiment in the present disclosure, two components (capacitor and ESD protection device) are implemented as a single composite electronic component, whereby the area in which they are mounted on the PCB may be reduced. According to an exemplary embodiment in the present disclosure, the area in which components are mounted may be reduced as compared with an existing disposition pattern by about 50% or more. 
     In addition, the composite electronic component according to an exemplary embodiment in the present disclosure may be used in a high speed data line, a universal serial bus (USB) 3.0 or higher line, a high definition multimedia interface (HDMI) line, and the like, and may be used in a cable interconnecting electronic boards or an external port in products configuring electronic boards, for example, in vehicles, television (TV) sets, and the like. 
     Since this application has a high data rate, a very high reaction speed, and a high frequency band, the ESD protection device needs to be appropriate. 
     For example, in the composite electronic component according to an exemplary embodiment in the present disclosure, the ESD protection device may be an ESD suppressor that may be used in the high speed data line, the USB 3.0 or higher line, the HDMI line, and an external port having a high data rate, a very high reaction speed, and a high frequency band. 
     Method of Manufacturing Composite Electronic Component 
     A method of manufacturing a composite electronic component according to another exemplary embodiment in the present disclosure may include preparing a capacitor configured of a ceramic body in which a plurality of dielectric layers and internal electrodes disposed so as to face each other with a respective dielectric layer interposed therebetween are stacked; forming first and second electrodes on the ceramic body so as to be insulated from each other; applying a paste containing a conductive polymer between the first and second electrodes to prepare a discharging part; applying an insulating resin onto the first and second electrodes and the discharging part to prepare an ESD protection device; and forming an input terminal and a ground terminal on both end surfaces of a composite body in a length direction, respectively, the composite body being formed by coupling the capacitor configured of the ceramic body and the ESD protection device formed on the ceramic body to each other. 
     Hereinafter, the method of manufacturing a composite electronic component according to another exemplary embodiment in the present disclosure will be described. However, the present disclosure is not limited thereto. 
     In the method of manufacturing a composite electronic component, the capacitor configured of the ceramic body in which the plurality of dielectric layers and the internal electrodes disposed so as to face each other with a respective dielectric layer interposed therebetween are stacked may be first prepared. 
     A method of preparing the capacitor configured of the ceramic body is not particularly limited, but may be the same as a general method of manufacturing a capacitor. 
     For example, a slurry containing a powder such as barium titanate (BaTiO 3 ) powder, or the like, having an average particle size of 0.5 μm or less may be applied and dried on carrier films to prepare a plurality of ceramic green sheets. 
     Next, a conductive paste for an internal electrode containing nickel powder particles having an average particle size of 0.5 μm or less may be prepared. 
     The conductive paste for an internal electrode may be prepared by adding barium titanate (BaTiO 3 ) powder separately from, and in addition to, a nickel powder. 
     The a conductive paste for an internal electrode may be applied onto the ceramic green sheets by a screen printing method to form the internal electrodes, and 100 to 300 ceramic green sheets on which the internal electrodes are formed may be stacked to form a multilayer body. 
     Then, the multilayer body may be compressed and cut to manufacture a chip having a necessary size, thereby preparing a ceramic body. 
     Next, the first and second electrodes may be formed on the ceramic body so as to be insulated from each other. 
     This process of forming the first and second electrodes is not particularly limited, but may be performed by, for example, a printing method using a paste containing a metal such as copper (Cu), or the like. 
     Shapes of the first and second electrodes are not particularly limited, but may be the same as those of the internal electrodes in the ceramic body. 
     The first and second internal electrodes may be formed on the same plane, may be exposed to first and second end surfaces of the ESD protection device in the length direction, respectively, and may be internally spaced apart from each other to thereby be insulated from each other. 
     Next, the paste containing the conductive polymer may be applied between the first and second electrodes to prepare the discharging part. 
     This process of applying the paste containing the conductive polymer between the first and second electrodes is not particularly limited, but may be performed by a printing method. 
     Next, the insulating resin may be applied onto the first and second electrodes and the discharging part to prepare the ESD protection device. 
     The insulating resin may be any material that may protect the first and second electrodes and the discharging part from the outside, and for example, may be an epoxy based resin. 
     Next, the input terminal and the ground terminal may be formed on both end surfaces of the composite body in the length direction thereof, respectively, and the composite body is formed by coupling the capacitor including the ceramic body and the ESD protection device formed on the ceramic body to each other. 
     The input terminal may be formed on the first end surface of the composite body in the length direction, and the ground terminal may be formed on the second end surface thereof in the length direction. 
     A process of forming the input terminal and the ground terminal may be performed by applying a conductive paste containing a metal such as copper (Cu), or the like, and a conductive paste containing an insulating material such as glass, or the like onto both end surfaces of the composite body in the length direction. 
     The process of forming the input terminal and the ground terminal may be performed by a dipping method or a printing method, but is not limited thereto. 
     Next, plating layers may be formed on the input terminal and the ground terminal by a method such as a plating method, or the like, to manufacture the composite electronic component. 
     The plating layers are not particularly limited, but may be, for example, nickel/tin (Ni/Sn) plating layers. 
     Board for Mounting of Composite Electronic Component 
       FIG. 14  is a perspective view illustrating a manner in which the composite electronic component of  FIG. 8  is mounted on a printed circuit board. 
     Referring to  FIG. 14 , a board  600  for mounting of a composite electronic component  200  according to the exemplary embodiment in the present disclosure may include a printed circuit board  610  on which the composite electronic component  200  is mounted and two electrode pads  621  and  622  disposed on an upper surface of the printed circuit board  610 . 
     The electrode pads  621  and  622  may be first and second electrode pads  621  and  622  connected to the input terminal  231  and the ground terminal  232  of the composite electronic component, respectively. 
     Here, the input terminal  231  and the ground terminal  232  of the composite electronic component  200  may be electrically connected to the printed circuit board  610  by solder  630  in a state in which they are positioned on the first and second electrode pads  621  and  622 , respectively, so as to contact the first and second electrode pads  621  and  622 , respectively. 
     When a voltage is applied to the composite electronic component  200  in a state in which the composite electronic component  200  is mounted on the printed circuit board  610 , acoustic noise may occur. 
     Here, sizes of the first and second electrode pads  621  and  622  may become indices in determining the amount of solder  630  connecting the input terminal  231  and the ground terminal  232  of the composite electronic component  200  and the first and second electrode pads  621  and  622  to each other, respectively, and the magnitude of the acoustic noise may be adjusted depending on the amount of solder  630 . 
     Meanwhile, when voltages having different polarities are applied to the input terminal  231  and the ground terminal  232  formed on both end surfaces of the composite electronic component  200  in the length direction, respectively, in a state in which the composite electronic component  200  is mounted on the printed circuit board  610 , the ceramic body may be expanded and contracted in the thickness direction due to an inverse piezoelectric effect of the dielectric layers  211 , and both end portions of the input terminal  231  and the ground terminal  232  in the length direction may be contracted and expanded in directions opposite to the expansion and contraction directions of the ceramic body in the thickness direction, due to the Poisson effect. 
     Here, in the composite electronic component according to an exemplary embodiment in the present disclosure, the ESD protection device is disposed on the lower surface of the ceramic body of the capacitor to reduce the phenomenon in which vibrations of the capacitor due to the inverse piezoelectric feature of the capacitor are transferred to the board at the time of mounting the composite electronic component on the board, whereby acoustic noise may be reduced. 
     In addition, in the composite electronic component according to an exemplary embodiment in the present disclosure, the ESD protection device is disposed on the lower surface of the ceramic body of the capacitor, such that the capacitor may be disposed at a distance distant from the board, whereby the capacitor may be protected even though cracks, or the like, occur in the composite electronic component. 
     Further, in the composite electronic component according to an exemplary embodiment in the present disclosure, the ESD protection device is disposed on the lower surface of the ceramic body of the capacitor, such that the distance between the ESD protection device and the board is close to reduce parasitic pattern resistance or parasitic inductance, whereby a side effect may be reduced. 
     For example, the parasitic pattern resistance or the parasitic inductance may be reduced, whereby frequency characteristics may be improved and characteristics of the composite electronic component filtering a noise component without distorting signals and bypassing a portion of an over-voltage may be improved. 
     Packaging Unit of Composite Electronic Component 
       FIG. 15  is a schematic perspective view illustrating a manner in which the composite electronic components of  FIG. 8  are mounted in a packaging unit. 
       FIG. 16  is a schematic cross-sectional view illustrating a packaging unit of  FIG. 15  coiled in a coil shape. 
     Referring to  FIG. 15 , a packaging unit  700  of a composite electronic component according to the exemplary embodiment in the present disclosure may include a packaging sheet  720  having receiving parts  724  formed therein, the receiving parts  724  receiving the composite electronic components  200  therein. 
     The receiving parts  724  of the packaging sheet  720  may have shapes corresponding to those of the composite electronic components  200 , and the internal electrodes may be disposed horizontally, based on bottom surfaces  725  of the receiving parts  724 . 
     In detail, respective composite electronic components  200  received in the receiving parts  724  may be disposed so that the ESD protection device  220  thereof is directed toward the bottom surface of the receiving part  724 . 
     The composite electronic components  200  may be maintained in a state in which the internal electrodes thereof are horizontally aligned with each other through an electronic component aligning apparatus and be moved to the packaging sheet  720  through a transferring apparatus. 
     Therefore, respective composite electronic components  200  received in the receiving parts  724  may be disposed so that the ESD protection device  220  thereof is directed toward the bottom surface of the receiving part  724 . 
     Through such a method, a plurality of composite electronic components  200  in the packaging sheet  720  may be disposed to have the same directionality in the packaging sheet  720 . 
     The packaging unit  700  of the composite electronic component may further include a packaging film  740  covering the packaging sheet  720  in which the composite electronic components  200  having the internal electrodes disposed horizontally based on the bottom surfaces of the receiving parts  724  and the ESD protection devices  220  disposed so as to be directed toward the bottom surfaces of the receiving parts  724  are received. 
     The packaging unit  700  of a composite electronic component coiled in the coil shape shown in  FIG. 16  may be obtained through continuous coiling operation. 
     As set forth above, according to exemplary embodiments in the present disclosure, the composite electronic component capable of being mounted in a reduced area may be provided. 
     While exemplary embodiments have been shown and described above, it will be apparent to those skilled in the art that modifications and variations could be made without departing from the spirit and scope of the present disclosure as defined by the appended claims.