Patent Publication Number: US-2009229872-A1

Title: Electronic component built-in board, manufacturing method of electronic component built-in board, and semiconductor device

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention generally relates to an electronic component built-in board, an electronic component built-in board manufacturing method and a semiconductor device. 
     More specifically, the present invention relates to an electronic component built-in board including built-in electronic components and a manufacturing method of the electronic component built-in board, and a semiconductor device. 
     2. Description of the Related Art 
     Recently, miniaturization of semiconductor chips (such as semiconductor chips for a central processing unit (CPU)) has been advanced and the number of multi-terminals of the semiconductor chips has been increased. There is provided a semiconductor device that includes a wiring board for mounting the semiconductor chips, and another wiring board (an electronic component built-in board  303  shown in  FIG. 1 ) including built-in electronic components and connected to a mounting board such as a mother board, in which the wiring boards are separately included in a stacked manner. 
       FIG. 1  is a cross section of a related art semiconductor device. 
     Referring to  FIG. 1 , a related art semiconductor device  300  includes a wiring board  301 , a semiconductor chip  302  and an electronic component built-in board  303 . 
     The wiring board  301  is arranged between the semiconductor chip  302  and the electronic component built-in board  303 . The wiring board  301  includes a multilayer insulating part  311  formed by laminating plural insulation layers, chip connection pads  312  provided on a front surface  311 A of the multilayer insulating part  311  for chip connection, board connection pads  313  provided on a rear surface  311 B of the multilayer insulating part  311 , and wiring patterns  314  formed in the multilayer insulating part  311  for electrically connecting between the board connection pads  313  and the chip connection pads  312 . 
     The wiring board  301  is electrically connected to the semiconductor chip  302  and the electronic component built-in board  303 . The wiring board  301  is a board for adjusting the wiring pitch of the board connection pads  313  so that the board connection pads  313  face pads  329  forming the electronic component built-in board  303  and pad parts  343 . 
     The semiconductor chip  302  includes electrode pads  316 . The electrode pads  316  are electrically connected to the chip connection pads  312  via bumps  305 . For example, a semiconductor chip of a CPU may be used for the semiconductor chip  302 . 
     The electronic component built-in board  303  is arranged below the wiring board  301 . The electronic component built-in board  303  includes insulation layers  318 ,  320 , and  327 , electronic components (or referred to as electronic components)  319 , connection pads  321  for connecting electronic components, wiring patterns  322 , 328 , pads  324 ,  329 , external connection terminals  325 ,  333 , and penetrating electrodes  331 . 
     The insulating layer  318  includes through-holes  335 . Electronic components  319  are accommodated in the through-holes  335 . The electronic components  319  include electrodes  337 . The electrodes  337  are electrically connected to the connection pads  321  with solder  338 . 
     The insulating layer  320  is provided on the rear surface  318 B of the insulating layer  318 . The connection pads  321  are formed on the surface of the insulating layers  320  exposed by the through-holes  335 . The wiring patterns  322  are formed on the insulating layer  320 . The wiring patterns  322  penetrate the insulating layer  320 . Parts of the wiring patterns  322  penetrating the insulating layer  320  are connected to the connection pads  321 . The wiring pattern  322  includes pad parts  341  on which the external connection terminals  325  are formed. 
     Pads  324  are arranged on the rear surface of the insulating layer  320 . The external connection terminals  325  are formed on the pads  324 . The insulating layer  327  is formed on the surface  318 A of the insulating layer  318 . 
     The wiring patterns  328  are formed in the insulating layer  327 . The wiring patterns  328  penetrate the insulating layer  327 . Parts of the wiring patterns  328  penetrating the insulating layer  327  are connected to the electrode  337 . The wiring patterns  328  include the pads  343  on which the external connection terminals  333  are formed. The pads  343  are electrically connected to the board connection pads  313  via the external connection terminals  333 . 
     Pads  329  are formed on the surface of the insulating layer  327 . The pads  329  are electrically connected to the pads  324  via the penetrating electrodes  331 . Also, the pads  329  are electrically connected to the board connection pads  313  via the external connection terminals  333 . 
     The penetrating electrodes  331  are formed to penetrate the insulating layers  318 ,  320  and  327 . The upper sides of the penetrating electrodes  331  are connected with the pads  329 . It is described in Japanese Patent Application Publication No. 2005-217382 that the bottom sides of the penetrating electrodes  331  are connected to the pads  324 . 
     In the related art electronic component built-in board  303 , the electrical connection reliability between the pads  321  and the electrodes  337  of the electronic components  319  and between the wiring patterns  328  and the electrodes  337  of the electronic components  319  may be degraded by a difference of a thermal expansion coefficient between the electronic components  319  and the insulating layers  318 ,  320 , and  327 . 
     Further, there is a problem that the related art electronic component built-in board  303  cannot be downsized in the thickness direction, since the related art electronic component built-in board  303  includes the insulating layers  320  and  327 , and the wiring patterns  322  and  328  on the top and bottom of the electronic components  319 . 
     Also, the related art semiconductor device  300  including the electronic component built-in board  303  described above has problems, in which the electrical connection reliability of the semiconductor device  300  may be degraded, and the semiconductor device  300  cannot be downsized in the thickness direction of the semiconductor device. 
     SUMMARY OF THE INVENTION 
     Accordingly, embodiments of the present invention may provide a novel and useful electronic component built-in board solving one or more of the problems discussed above. 
     It is a general object of the present invention to provide an electronic component built in board, a manufacturing method, and a semiconductor device which can improve the electrical connection reliability and downsize the electronic component built-in board in the thickness direction, in which the problem above is minimized. 
     More specifically, the embodiments of the present invention may provide an electronic component built-in board including an electronic component having an electrode; a conductive material part arranged in an identical plane to the electronic component; and a resin member configured to support the electronic component and the conductive material part in a state where an upper side and a bottom side of the electronic component and an upper side and a bottom side of the conductive material part are exposed. 
     One aspect of the present invention may be to provide a manufacturing method for manufacturing an electronic component built-in board configured to include an electronic component having and electrode, a conductive material part arranged in an identical plane to the electronic component, and a resin member, the manufacturing method comprising the steps of: providing the electronic component and the conductive material part on a support member; forming the resin member so as to cover at least a side of the electronic component and a side of the conductive material part; exposing an upper side of the electrode and an upper side of the conductive material part from the resin member; and removing the support member after the step of exposing. 
     Other objects, features, and advantages of the present invention will become more apparent from the following detailed description when read in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross section of a related art semiconductor device; 
         FIG. 2  is a cross section of a semiconductor device according to the first embodiment of this invention; 
         FIG. 3  is a cross section of the semiconductor device according to the first modified example of the first embodiment of this invention; 
         FIG. 4  is a cross section of the semiconductor device according to the second modified example of the first embodiment of this invention; 
         FIG. 5  is a drawing showing a manufacturing process of an electronic component built-in board according to the first embodiment of this invention (case 1); 
         FIG. 6  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 2); 
         FIG. 7  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 3); 
         FIG. 8  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 4); 
         FIG. 9  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 5); 
         FIG. 10  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 6); 
         FIG. 11  is a drawing showing a manufacturing process of the electronic component built-in board according to the first embodiment of this invention (case 7); 
         FIG. 12  is a drawing showing a manufacturing process of the electronic component built-in board according to the second modified example of the first embodiment of this invention (case 1); 
         FIG. 13  is a drawing showing a manufacturing process of the electronic component built-in board according to the second modified example of the first embodiment of this invention (case 2); 
         FIG. 14  is a drawing showing a manufacturing process of the electronic component built-in board according to the second modified example of the first embodiment of this invention (case 3); 
         FIG. 15  is a drawing showing a manufacturing process of the electronic component built-in board according to the second modified example of the first embodiment of this invention (case 4); 
         FIG. 16  is a cross section of the semiconductor device according to the second embodiment of this invention; 
         FIG. 17  is a cross section of a structure part used when the electronic component built-in board according to the second embodiment of this invention is manufactured; 
         FIG. 18  is a cross section of the semiconductor device according to a modified example of the second embodiment of this invention; 
         FIG. 19  is a cross section of the semiconductor device according to the third embodiment of this invention; 
         FIG. 20  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 1); 
         FIG. 21  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 2); 
         FIG. 22  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 3); 
         FIG. 23  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 4); 
         FIG. 24  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 5); 
         FIG. 25  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 6); 
         FIG. 26  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 7); 
         FIG. 27  is a drawing showing a manufacturing process of the semiconductor device according to the third embodiment of this invention (case 8); 
         FIG. 28  is a cross section of the semiconductor device according to the fourth embodiment of this invention; 
         FIG. 29  is a cross section of the electronic component built-in board according to a modified example of the fourth embodiment of this invention; 
         FIG. 30  is a drawing showing a manufacturing process of the electronic component built-in board according to the fourth embodiment of this invention (case 1); 
         FIG. 31  is a drawing showing a manufacturing process of the electronic component built-in board according to the fourth embodiment of this invention (case 2); 
         FIG. 32  is a cross section of the semiconductor device according to the fifth embodiment of this invention; and 
         FIG. 33  is a cross section of the electronic component built-in board according to a modified example of the fifth embodiment of this invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     In the following, preferred embodiments of the present invention will be described with accompanying drawings. 
     First Embodiment  
       FIG. 2  is a cross section of a semiconductor device according to the first embodiment of this invention. 
     As shown in  FIG. 2 , a semiconductor device  10  according to the present embodiment includes a wiring board  11 , a semiconductor chip  12 , an electronic component built-in board  13  and underfill resin  17 . 
     The wiring board  11  is arranged between the semiconductor chip  12  and the electronic component built-in board  13 . The wiring board  11  includes a multilayer insulating part  21 , chip connection pads  22 , board connection pads  23 , wiring patterns  24 , and solder resist layers  26  and  27 . The multilayer insulating part  21  is formed from stacked plural insulating layers. As the insulating layer forming the multilayer insulating part  21 , for example, a resin layer can be used (specifically, the resin layer may be epoxy resin or polyimide resin). 
     The chip connection pads  22  are formed on the front surface  21 A of the multilayer insulating part  21  in a region (the main surface of the wiring board  11 ) corresponding to a mounting region of the semiconductor chip  12 . For example, copper (Cu) can be used as a material of the chip connection. 
     The board connection pads  23  are formed on the rear (or bottom) surface  21 B (opposite side of the main surface of the wiring board  11 ) of the multilayer insulating part  21 . The board connection pads  23  are arranged to face upper sides of electrodes  45  and  46  of electronic components  35  to be described later or upper sides of conductive material parts  36 . The board connection pads  23  are electrically connected to the chip connection pads  22  via the wiring patterns  24 . The board connection pads  23  are connected to external connection terminals  41  to be described later provided on the electronic component built-in board  13 . 
     The wiring patterns  24  are formed in the multilayer insulating part  21 . One of sides of the wiring patterns  24  are connected to the chip connection pads  22 , and the other sides of the wiring patterns  24  are connected to the board connection pads  23 . 
     The solder resist layers  26  are formed on the front surface  21 A of the multilayer insulating part  21 . The solder resist layer  26  includes opening parts which expose the front surfaces of the chip connection pads  22 . 
     The solder resist layer  27  is formed on the rear surface  21 B of the multilayer insulating part  21 . The solder resist layer  27  includes opening parts which expose the rear surfaces of the board connection pads  23 . 
     The wiring board  11  described above is a board for adjusting the wiring pitch of the board connection pads  23  so that the board connection pads  23  face the upper sides of the electrodes  45  and  46  to be described later formed in the electronic component built-in board  13  or the upper sides of the conductive material parts  36 . 
     The semiconductor chip  12  is disposed on the wiring board  11 . The semiconductor chip  12  includes electrode pads  31 . The electrode pads  31  are electrically connected to the chip connection pads  22  via the bumps  15 . In other words, the semiconductor chip  12  is connected to the chip connection pads  22  by flip chip connection. Further, the underfill resin  16  is filled between the semiconductor chip  12  and the wiring board  11 . With increasing demand for miniaturization, the number of terminals of a semiconductor chip has been increased. The semiconductor chip  12  is such semiconductor chip. For example, a CPU chip can be used for the semiconductor chip  12 . 
     The electronic component built-in board  13  is arranged below the wiring board  11 . The electronic component built-in board  13  includes the electronic components  35 , the conductive material parts  36 , a resin member  37  and the external connection terminals  41  and  43 . 
     The electronic components  35  include a pair of the electrodes  45  and  46 . The electrodes  45  are the electrodes used for power supply, and the electrodes  46  are the electrodes used for the ground. The upper sides and bottom sides of the electrodes  45  and  46  are exposed from the resin member  37 . The external connection terminals  41  are provided on the upper sides of the electrodes  45  and  46 . The electrodes  45  and  46  are electrically connected to the wiring board  11  via the external connection terminals  41 . The bottom sides of the electrodes  45  and  46  are provided with the external connection terminals  43 . The sides of the electronic components  35  are supported by the resin member  37 . For example, a passive device is used for the electronic components  35 . 
     For example, a chip capacitor, a chip resistor, or a chip inductor is used as the passive device. 
     The conductive material parts  36  are arranged in an identical plane to the electronic components  35 . The conductive material parts  36  are metal core balls, which include metal balls  48  and solder  49  covering the metal ball  48  (e.g. Cu balls). The upper sides and bottom sides of the conductive material parts  36  are exposed from the resin member  37 . The conductive material parts  36  are signal terminals which provide signals to the semiconductor chip  12 . 
     The resin member  37  is a member having a plate-shaped configuration. The resin member  37  supports the electronic components  35  and the conductive material parts  36  by contacting the side of the electronic components  35  and the side of the conductive material parts  36 . The resin member  37  exposes the upper sides and bottom sides of the electronic components  35 , and also exposes the upper sides and bottom sides of the conductive material parts  36 . 
     In this way, the resin member  37  supporting the electronic components  35  and the conductive material parts  36  is formed to expose the upper sides and bottom sides of the electrodes  45  and  46  of the electronic components  35  and the bottom sides and the upper sides of the conductive material parts  36 . With this, compared to the related art electronic component built-in board  303  (see  FIG. 1 ) which includes parts such as the insulating layers  320  and  327  and the wiring patterns  322  and  328  electrically connected to the electronic components  35  at the upper side and bottom side of the electronic components  319 , the electrical connection reliability of the electronic component built-in board  13  can be improved, and the electronic component built-in board  13  can be downsized in the thickness direction. 
     Further, the improvement of the electrical connection reliability of the electronic component built-in board  13  can improve the electrical connection reliability of the semiconductor device  10  including the electronic component built-in board  13 . The downsizing of the electronic component built-in board  13  in the thickness direction can also downsize the semiconductor device  10  in the thickness direction. 
     For example, a material such as epoxy resin or mold resin can be used for the material of the resin member  37 . Generally, since a content of the silicone filler in the mold resin (or, filler of aluminum) is high (e.g. 70 wt % through 80 wt %), the difference of the thermal expansion coefficient between the electronic components  35  and the resin member  37  can be decreased when the mold resin is used as the material of the resin member  37 . 
     Also, it is preferable that the thickness of the resin member  37  is smaller than the height of the electronic components  35  and the conductive material parts  36 . Specifically, when the height of the electronic components  35  is 0.5 μm and the height of the conductive material parts  36  is 0.35 μm, for example, the thickness of the resin member  37  may be 0.3 μm. 
     In this way, by making the thickness of the resin member  37  to be smaller than the height of the electronic components  35  and the conductive material parts  36 , the electronic component built-in board  13  can be further downsized in the thickness direction. 
     The external connection terminals  41  are provided between the upper sides of the electrodes  45  and  46  of the electronic components  35  and the board connection pads  23  formed on the wiring board  11 , and also between the upper sides of the conductive material parts  36  and the board connection pads  23 . The external connection terminals  41  electrically connect between the electronic components  35  and the board connection pads  23 , and electrically connect between the conductive material parts  36  and the board connection pads  23 . For example, solder such as Sn—Ag—Cu solder may be used as the external connection terminals  41 . 
     In  FIG. 2 , although an example is given for use of the solder as the external connection terminals  41 , external connection terminals (not shown) may be used instead of the external connection terminals  41 , in which the external connection terminals are arranged inside of the solder shown in  FIG. 2  and include Au bumps which contact the upper sides of the electrodes  45  and  46  or the upper sides of the conductive material parts  36  (not shown) and include solder covering the Au bumps. 
     In this way, by forming the external connection terminals which are arranged inside of the solder and include Au bumps and the solder covering the Au bumps, the connection strength can be improved between the board connection pads  23  and the electrodes  45  and  46  and between the board connection pads  23  and the conductive material parts  36 . 
     The external connection terminals  43  are formed on the bottom sides of the electrodes  45  and  46  of the electronic components  35  and the bottom sides of the conductive material parts  36 . The external connection terminals  43  are terminals which electrically connect between the electronic component built-in board  13  and the mounting board (not shown) such as a mother board. 
     For example, solder such as Sn—Ag—Cu solder can be used for the external connection terminals  43 . 
     In  FIG. 2 , although an example is given for use of the solder as the external connection terminals  43 , external connection terminals (not shown) may be used instead of the external connection terminals  43 , in which the external connection terminals are arranged inside of the solder shown in  FIG. 2  and include Au bumps which contact the upper sides of the electrodes  45  and  46  or the upper sides of the conductive material parts  36  (not shown) and include solder covering the Au bumps. 
     In this way, by forming the external connection terminals which are arranged inside of the solder and include Au bumps and the solder covering the Au bumps, the connection strength can be improved between the connection pads formed on the mounting board and the electrodes  45  and  46  and between the connection pads formed on the mounting board and the conductive material parts  36 , when the electronic component built-in board  13  is mounted on the mounting board (not shown). 
     The underfill resin  17  is formed to fill a gap between the wiring board  11  and the electronic component built-in board  13 . The underfill resin  17  is resin which improves the connection strength between the wiring board  11  and the electronic component built-in board  13 . 
     According to the electronic component built-in board of this embodiment, the resin member  37  having a plate-shaped configuration supports the electronic components  35  and the conductive material parts  36  by exposing the upper sides of and bottom sides of the electrodes  45  and  46  of the electronic components  35  and the bottom side and the upper sides of the conductive material parts  36 . With this, compared to the related art electronic component built-in board  300  (see  FIG. 1 ) which includes parts such as the insulating layers  320  and  327  and the wiring patterns  322  and  328  electrically connected to the electronic components  35  at the upper side and bottom side of the electronic components  319 , the electrical connection reliability of the electronic component built-in board  13  can be improved, and the electronic component built-in board  13  can be downsized in the thickness direction. 
     According to the semiconductor device of the present embodiment, there is provided the electronic component built-in board  13  which is downsized in the thickness direction and improved in the electrical connection reliability, and thus the semiconductor device  10  can be improved in the electrical connection reliability and downsized in the thickness direction of the semiconductor device  10 . 
       FIG. 3  is a cross section of a semiconductor device related to the first modification example of the first embodiment of this invention. In  FIG. 3 , the identical symbols are used for the component parts which are identical to those of the semiconductor device  10  of the first embodiment shown in  FIG. 2 . 
     Referring to  FIG. 3 , a semiconductor device  50  of the first modified example of the first embodiment includes a configuration similar to that of the semiconductor device  10  except that an electronic component built-in board  51  is used instead of the electronic component built-in board  13  ( FIG. 2 ) which is used in the semiconductor device  10  of the first embodiment. 
     The electronic component built-in board  51  has the similar configuration to that of the electronic component built-in board  13  except that conductive material parts  53  are provided instead of the conductive material parts  36  formed in the electronic component built-in board  13 . 
     The conductive material parts  53  are signal terminals which supply signals to the semiconductor chip  12 . The conductive material parts  53  are formed to be pillar shaped. The conductive material parts  53  include pillar shaped members  54  having conductivity and metal films  55  covering the pillar shaped members  54 . For example, an alloy including such as Ni—Co alloys may be used as the material of the pillar shaped members  54 . For example, an Au film may be used for the metal film  55 . 
     In this way, by use of the conductive material parts  53  which include the pillar shaped members  54  having conductivity and the metal films  55  covering the pillar shaped members  54  as the signal terminals, the height of the conductive material parts  53  can be increased to be higher than the conductive material parts  36  (specifically, a metal core ball) described above. With this, the height of the conductive material parts  53  can be adjusted according to the height of the electronic components  35 . 
       FIG. 4  is a cross section of the semiconductor device according to the second modified example of the first embodiment of this invention. In  FIG. 4 , the identical symbols are used for the component parts which are identical to those of the semiconductor device  10  of the first embodiment. 
     Referring to  FIG. 4 , a semiconductor device  60  of the second modified example of the first embodiment includes a configuration similar to that of the semiconductor device  10  except that an electronic component built-in board  61  is used instead of the electronic component built-in board  13  ( FIG. 2 ) which is used in the semiconductor device  10  of the first embodiment. 
     The electronic component built-in board  61  has a similar configuration to that of the electronic component built-in board  13  except that the resin member  62  is provided instead of the resin member  37  provided in the electronic component built-in board  13 . 
     The resin member  62  is formed to cover the side of the electronic components  35 , the upper side and bottom side of the electronic components  35  without covering parts of the electrodes  45  and  46 , and the side of the conductive material parts  36 . The thickness of the resin member  62  is designed to be thicker than the thickness of the resin member  37 . Specifically, when the height of the electronic components  35  is 0.5 μm and the height of the conductive material parts  36  is 0.35 μm, for example, the thickness of the resin member  62  may be 0.7 μm. 
     The resin member  62  includes opening parts  63 A,  63 B and  63 C which accommodate part of the external connection terminals  41 , and  64 A,  64 B and  64 C which accommodate part of the external connection terminals  43 . The opening part  63 A is formed to expose the upper sides of the conductive material parts  36 . The opening part  63 B is formed to expose the upper side of the electrode  45 . The opening part  63 C is formed to expose the upper side of the electrode  46 . The opening part  64 A is formed to expose the bottom sides of the conductive material part  36 . The opening part  64 B is formed to expose the bottom side of the electrode  45 . The opening part  64 C is formed to expose the bottom side of the electrode  46 . 
     In this way, by forming the opening parts  63 A,  63 B and  63 C which accommodate the part of the external connection terminals  41  in the resin member  62  being thicker than the resin member  37 , the parts constituting the opening parts  63 A,  63 B, and  63 C of the resin member  62  regulate positions of the external connection terminals  41 , so that the adjacent external connection terminals  41  can be prevented from short circuiting. 
     Also, by forming the opening parts  64 A,  64 B and  64 C which accommodate the part of the external connection terminals  43  in the resin member  62  being thicker than the resin member  37 , the parts constituting the opening parts  64 A,  64 B, and  64 C of the resin member  62  regulate positions of the external connection terminals  43 , so that the adjacent external connection terminals  43  can be prevented from short circuiting. 
     Further, instead of the resin member  35  provided in the electronic component built-in board  51  ( FIG. 3 ) described above, the resin member  62  shown in  FIG. 4  may be provided as the resin member of the electronic component built-in board  51 . 
       FIG. 5  through  FIG. 11  are drawings showing a manufacturing process of the electronic component built-in board according to the first embodiment of the present invention. In  FIG. 5  through  FIG. 11 , the identical symbols are used for the component parts which are identical to those of the electronic component built-in board  13  of the first embodiment. 
     Referring to  FIG. 5  through  FIG. 11 , a description will be given for the manufacturing method of the electronic component built-in board  13  of the first embodiment. In a process shown in  FIG. 5 , there is provided a support member  71  which includes a main supporting part  72  and an adhesion layer  73  stacked on the main supporting part  72 . For example, as the main supporting part  72 , a metal foil such as a Cu foil or a metal layer such as Cu layer can be used. When the Cu foil is used as the main supporting part  72 , the thickness of the main supporting part  72  may be 0.8 μm. The adhesion layer  73  is used for temporarily fixing the electronic components  35  and the conductive material parts  36 . For example, as the adhesion layer  73 , a resin layer with a semi-cured state such as an epoxy resin layer may be used. When the resin layer of a semi-cured state is used as the adhesion layer  73 , for example, the thickness of the adhesion layer  73  may be approximately 20 μm. 
     Next, in the process shown in  FIG. 6 , the electronic components  35  and the conductive material parts  36  are disposed on the adhesion layer  73  (referred to as the arrangement process of electronic components and conductive material parts). With this, the electronic components  35  and the conductive material parts  36  are arranged on the identical plane and temporarily fixed on the adhesion layer  73 . 
     In the process shown in  FIG. 7 , on the front surface of the adhesion layer  73 , the resin member  37  is formed to cover at least the sides of the electronic components  35  and the sides of the conductive material parts  36  (referred to as the resin member formation process). Specifically, a resin tablet (not shown) is mounted on the obtained structure shown in  FIG. 6 , and subsequently the resin tablet is pressed by a flat metal plate so that the resin member  37  is formed. At this stage, the upper sides of the electronic components  35  and the upper sides of the conductive material parts  36  are covered with the resin member  37 , and the thickness of the resin member  37  of  FIG. 7  is thicker than that of the resin member  37  of  FIG. 2 . In this embodiment, a description will be given in the following for a case where the resin member  37  is formed to cover the upper sides of the electronic components  35  and the upper sides of the conductive material parts  36  as an example. Further, in the resin member formation process, the resin member  37  may be formed to expose the upper sides of the electronic components  35  and the upper sides of the conductive material parts  36 . 
     For example, epoxy resin or mold resin may be used as the material of the resin tablet. When the mold resin (a content of silicone filler or, filler of aluminum is high, for example, 70 wt % through 80 wt %) is used as the material of the resin member  37 , the difference of the thermal expansion coefficient between the electronic components  35  and the resin member  37  can be decreased. 
     Next, in the process shown in  FIG. 8 , by removing the whole upper part of the resin member  37  as shown in  FIG. 7 , the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36  are exposed from the resin member  37  (referred to as the resin member removal process). Specifically, by performing an ashing process of the resin member  37  from the front surface of the resin member  37  shown in  FIG. 7 , the resin member  37  is removed until the upper side of the electrodes  45  and  46  and the upper sides of the conductive material parts  36  are exposed. The ashing process above may be performed, for example, by use of oxygen (O 2 ) gas having a purity of 99.99% (the oxygen gas may be mixed with argon (Ar) gas and carbon fluoride gas such as CF 4 ), with a gas flow rate of 500 sccm at a radio frequency (RF) power of approximately 350 W at a frequency of 13.56 MHz under a pressure of approximately 133 Pa at a temperature ranging from approximately 90° C. to 120° C. in the process chamber. In this case, the process time may be approximately 15 min. 
     In this way, by removing the resin member  37  with the ashing process, the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36  can be exposed from the resin member  37  without causing any damage to the electronic components  35  and the conductive material parts  36 . 
     Next, in the process shown in  FIG. 9 , the support member  71  of  FIG. 8  is removed (referred to as the support member removal process). 
     Specifically, for example, the support member  71  is peeled from the resin member  37 . 
     In the process shown in  FIG. 10 , by removing the whole lower part of the resin member  37  of  FIG. 9 , the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  36  are certainly exposed from the resin member  37 . Specifically, by performing the ashing process for the resin member  37  from the rear surface of the resin member  37  of  FIG. 9 , the whole lower part of the resin member  37  is removed. The ashing process above may be performed, for example, by use of oxygen (O 2 ) gas having a purity of 99.99% (the oxygen gas may be mixed with argon (Ar) gas and carbon fluoride gas such as CF 4 ), with a gas flow rate of 500 sccm at a radio frequency (RF) power of approximately 350 W at a frequency of 13.56 MHz under a pressure of approximately 133 Pa at a temperature ranging from approximately 90° C. to 120° C. in the process chamber. In this case, the process time may be approximately 15 min. 
     In this way, by removing the whole lower part of the resin member  37  with the ashing process, the lower sides of the electrodes  45  and  46  and the lower sides of the conductive material parts  36  can be certainly exposed from the resin member  37  without causing any damage to the electronic components  35  and the conductive material parts  36 . 
     Further, if the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  36  formed in the obtained structure of  FIG. 9  are sufficiently exposed from the resin member  37 , the process shown in  FIG. 10  is not necessary. 
     Next, in the process shown in  FIG. 11 , the external connection terminals  41  are formed on the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36 , and the external connection terminals  43  are formed on the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  36 . With this, the electronic component built-in board  13  is manufactured. As the external connection terminals  41  and  43 , for example, solder such as Sn—Ag—Cu solder may be used. In  FIG. 11 , although an example is given for use of the solder as the external connection terminals  41  and  43 , by forming Au bumps (not shown) contacting the electrodes  45  and  46  or the conductive material parts  36  for the solder shown in  FIG. 11 , external connection terminals including Au bumps and solder covering the Au bumps may be formed. 
     According to the manufacturing method of the electronic component built-in board of this embodiment, the electronic components  35  including the electrodes  45  and  46  and the conductive material parts  36  are arranged in an identical plane to the support member  71 . Also the resin member  37  is formed to cover at least the side of the electronic components  35  and the side of the conductive material parts  36 . Subsequently, the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36  are exposed from the resin member  37 . The support member  71  is removed, and the external connection terminals  41  are formed on the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36 , and the external connection terminals  43  are formed on the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  36 . Thus, the electrical connection reliability of the electronic component built-in board  13  can be improved, and further the electronic component built-in board  13  can be downsized in the thickness direction. 
     Further, the electronic component built-in board  51  of the first modified example of the first embodiment may be manufactured by a method similar to the manufacturing method of the electronic component built-in board  13  described above. 
       FIG. 12  through  FIG. 15  are drawings showing a manufacturing process of the electronic component built-in board according to the second modified example of the first embodiment of the present invention. In  FIG. 12  through  FIG. 15 , the identical symbols are used for the component parts which are identical to those of the electronic component built-in board  61  of the second modified example of the first embodiment. 
     Referring to  FIG. 12  through  FIG. 15 , a description will be given for the manufacturing method of the electronic component built-in board  61  of the second modified example of the first embodiment. The structure shown in  FIG. 7  is formed first by performing a process similar to that described in the  FIG. 5  through  FIG. 7 . 
     In the process shown in  FIG. 12 , a mask  76  having through-holes  77 - 79  are arranged on the upper side of the structure part shown in  FIG. 11 , and the parts of the resin member  37  facing the through-holes  77 - 79  are removed by the ashing process with the mask  76 , so that the opening parts  63 A,  63 B and  63 C are formed in the resin member  37  (referred to as the resin member removal process). 
     The through-holes  77  are formed in the parts of the mask  76  facing the upper side of the conductive material parts  36 , and the through-holes  78  are formed in the parts of the mask  76  facing the upper side of the electrodes  45 .
 
Further, the through-holes  79  are formed in the parts of the mask  76  facing the upper side of the electrodes  46 .
 
     Next, in the process of  FIG. 13 , the main supporting part  72  formed on a structure part shown in  FIG. 12  is removed. Specifically, when the main supporting part  72  is a Cu foil, the main supporting part  72  is removed by an etching process. In a process shown in  FIG. 14 , the mask  81  having the through-holes  82 - 84  is arranged below the structure of  FIG. 13 , the parts of the resin member  37  facing the through-holes  82 - 84  are removed by the ashing process with the mask  81 , so that the opening parts  64 A,  64 B and  64 C are formed in the adhesion layer  73  (in this case, the resin layer is in a cured state). The resin member  37  including the opening parts  63 A,  63 B and  63 C and the resin member  62  including the opening parts  64 A,  64 B, and  64 C are formed. 
     The through-holes  82  are formed in the parts of the mask  81  facing the bottom side of the conductive material parts  36 . The through-holes  83  are formed in the parts of the mask  81  facing the bottom sides of the electrodes  45 . Further, the through-holes  84  are formed in the parts of the mask  81  facing the bottom sides of the electrodes  46 . 
     Next, in the process shown in  FIG. 15 , the external connection terminals  41  are formed on the upper side of the electrodes  45  and  46  and the upper side of the conductive material parts  36 , and the external connection terminals  43  are formed on the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  36 . With this, the electronic component built-in board  61  is manufactured. As the external connection terminals  41  and  43 , for example, solder such as Sn—Ag—Cu solder may be used. In  FIG. 15 , although an example is given for use of the solder as the external connection terminals  41  and  43 , by forming Au bumps (not shown) contacting the electrodes  45  and  46  or the conductive material parts  36  in the solder shown in  FIG. 15 , external connection terminals including Au bumps and solder covering the Au bumps may be formed. 
     Second Embodiment  
       FIG. 16  is a cross section of the semiconductor device of the second embodiment of this invention. In  FIG. 16 , the identical symbols are used for the component parts which are identical to those of the semiconductor device  10  of the first embodiment. 
     Referring to  FIG. 16 , the semiconductor device  90  of the second embodiment is formed similarly to the semiconductor device  10  except that the electronic component built-in board  91  is provided instead of the electronic component built-in board  13  included in the semiconductor device  10  of the first embodiment. 
     The electronic component built-in board  91  is formed similarly to the electronic component built-in board  13  except that the electronic component  92 , wiring (or wires)  93  and pads  94  are included in the electronic component built-in board  13  described in the first embodiment. 
     The sides of the electronic component  92  contact the resin part  37 , so that the electronic component  92  is supported by the resin member  37 . The electronic component  92  is an active element (active device) which includes electrode pads  96 . For example, a semiconductor chip including less number of the electrode pads  96  (e.g. a memory semiconductor chip) may be used as an active element. 
     The wiring  93  is provided on the surface of the electronic component  92  of which the electrode pads  96  is formed. The wires of the wiring  93  are connected to the pads  94  and the electrode pads  96 . 
     The wiring  93  is a wiring to electrically connect the electrode pads  96  and the pads  94  (rewiring). For example, Cu may be used as materials of the wiring  93 . 
     The pads  94  are arranged on parts of the wiring  93  corresponding to the forming area of the external connection terminals  43 . The pads  94  are provided to form the external connection terminals  43 . The parts of the pads  94  to be connected to the external connection terminals  43  are exposed from the resin member  37 . For example, Cu may be used as materials of the pads  94 . 
     According to the electronic component built-in board of this embodiment, a passive element, the electronic components  35  and an active element, the electronic components  92  are formed in the resin member  37 , so that an integration density of the electronic component built-in board  91  can be improved. 
     Further, the semiconductor device  90  of this embodiment can obtain a similar effect (advantage) of the semiconductor device  10  of the first embodiment. 
     As a substitute of the conductive material parts  36  formed in the electronic component built-in board  91 , the conductive material parts  53  of  FIG. 3  may be formed. Also, as substitutes of the resin member  37  formed in the electronic component built-in board  91 , the resin member  62  of  FIG. 4  may be formed. 
       FIG. 17  is a cross section of a structure part used in a process where the electronic component built-in board of the second embodiment of this invention is manufactured. It is a cross section of a structure body. 
     In  FIG. 17 , with respect to parts identical to those of the electronic component built-in board  91 , the same symbols used in the electronic component built-in board  91  are assigned. 
     In order to manufacture the electronic component built-in board  91  described above, the structure part  98  of  FIG. 17  is formed in advance. Next, by the process of  FIG. 6  described in the first embodiment, the electronic components  35 , the conductive material parts  36 , and the structure part  98  are provided on the adhesion layer  73 . Thereafter, similar processes to those of  FIG. 7  through  FIG. 11  described in the first embodiment are performed to manufacture the electronic component built-in board  91 . 
     Referring to  FIG. 17 , a description will be given for a manufacturing method of the structure part  98 . The electronic components  92  having the electrode pads  96  are prepared first, then, the wiring  93  is formed on the surface  92 A of the electronic components  92  at the side on which the electrode pads  96  are formed. The pads  94  are formed on the wiring  93 . The resin layer  99  is formed on the surfaces  92 A of the electronic components  92  for covering the wires of the wiring  93  and the pads  94 . Next the structure part  98  is formed by removing parts of the resin layer  99  facing the pads  94  (for example, by a polishing process). For example, epoxy resin or mold resin may be used as materials of resin layer  99 . 
     The resin layer  99  may be formed with the resin members  37  and  62  simultaneously while the resin members  37  and  62  are formed. 
       FIG. 18  is a cross section of the semiconductor device according to a modified example of the second embodiment of this invention. In  FIG. 18 , with respect to parts identical to those of the semiconductor device  90 , the same symbols used in the semiconductor device  90  are assigned. 
     Referring to  FIG. 18 , the semiconductor device  160  of the modified example of the second embodiment is formed similarly to the semiconductor device  90  of the second embodiment except that the electronic component built-in board  161  is formed instead of the electronic component built-in board  91  which is formed in the semiconductor device  90  of the second embodiment. 
     The electronic component built-in board  161  is formed similarly to the electronic component built-in board  91  except that the forming areas of the electronic components  35  and the electronic components  92  formed in the electronic component built-in board  91  are replaced; the pads  94  electrically connected to the electrode pads  96  of the electronic components  92  are arranged to face the board connection pads  23 ; and the pads  94  are electrically connected to the board connection pads  23  via the external connection terminals  41 . 
     In this way, by electrically connecting the pads  94  electrically connected to the electrode pads  96  of the electronic components  92  and the board connection pads  23  via the external connection terminals  41 , the wiring length between the semiconductor chip  12  and the electronic components  92  is shortened, so that signal exchanges between the semiconductor chip  12  and the electronic components  92  can be performed at high speed. 
     Third Embodiment  
       FIG. 19  is a cross section of the semiconductor device according to the third embodiment of this invention. 
     In  FIG. 19 , with respect to parts identical to those of the semiconductor device  50 , the same symbols used in the semiconductor device are assigned to the parts. 
     Referring to  FIG. 19 , the semiconductor device  100  of the third embodiment is formed similarly to the semiconductor device  50  of the first modified example of the first embodiment except that the electronic component built-in board  101  is formed instead of the electronic component built-in board  51  which is formed in the semiconductor device  50  of the first embodiment. 
     The electronic component built-in board  101  is formed similarly to the electronic component built-in board  51  ( FIG. 3 ) except that the electronic components  103 , non-conductive materials  104  and  109  having the adhesive property, and conductive materials  106  and  107  are additionally provided in the structure of the electronic component built-in board  51 . 
     The electronic components  103  are glued on part of the electronic components  35  except the electrodes  45  and  46  by the non-conductive material  104  having the adhesion nature. The electronic components  103  are smaller than the electronic components  35  (specifically, height and an area in a plane view). The electronic components  103  include a pair of electrodes  112  and  113 . 
     The electrodes  112  contact the conductive material  106 . The electrodes  112  are electrically connected to the electrodes  45  and the external connection terminals  41  via the conductive material  106  formed on the upper sides of the electrodes  45 . The electrodes  113  are electrically connected to the electrodes  46  and the external connection terminals  41  via the conductive material  106  formed on the upper side of the electrodes  46 . With this, the electronic components  103  are electrically connected to the electronic components  35 , and electrically connected to the semiconductor chip  12  via the wiring board  11 . 
     In this way, the integration density of the electronic component built-in board  101  can be improved by mounting the electronic components  103  on the electronic components  35 . 
     For example, a passive element may be used as the electronic components  103 . When chip capacitors are used as the electronic components  35 , the chip capacitors may be used as the electronic components  103 . 
     In this way, the chip capacitors are used as the electronic components  35  and  103 , the electronic components  103  are mounted on the electronic components  35 , and the electronic components  103  and the electronic components  35  are electrically connected, so that the capacitance of the capacitor becomes larger. 
     The non-conductive material  104  is arranged between the electronic components  35  and the electronic components  103 . The non-conductive material  104  is used to glue the electronic components  103  on the electronic components  35 . For example, underfill resin may be used as the non-conductive material  104 . 
     The conductive materials  106  are formed on the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53 . The external connection terminals  41  are provided on the front surface of the conductive materials  106 . The conductive materials  106  provided on the electrodes  45  electrically connect the external connection terminals  41 , the electrodes  112  of the electronic components  103  and the electrodes  45 . The conductive materials  106  provided on the electrodes  46  electrically connect the external connection terminals  41 , the electrodes  113  of the electronic components  103  and the electrodes  46 . The conductive materials  106  provided on the upper sides of the conductive material parts  53  electrically connect the external connection terminals  41  and the conductive material parts  53 . For example, electroconductive paste or solder may be used as the conductive materials  106 . For example, Ag paste may be used as the electroconductive paste. For example, Sn—Ag—Cu solder may be used as the solder. When the solder is used as the conductive materials  106 , the thickness of the conductive materials  106  may be approximately 30 μm. 
     The conductive materials  107  are formed on the bottom sides of the electrodes  45  and  46  and on the bottom sides of the conductive material parts  53 . The external connection terminals  43  are provided on the rear surface of the conductive materials  107 . The conductive materials  107  are electrically connected to the external connection terminals  43 . For example, electroconductive paste or solder may be used as the conductive materials  107 . For example, Ag paste may be used as the electroconductive paste. For example, Sn—Ag—Cu solder may be used as the solder. When the solder is used as the conductive materials  107 , for example, the thickness of the conductive materials  107  may be approximately 30 μm. 
     The non-conductive material  109  is formed in the resin member  37  to cover the lower and side parts of the conductive material parts  53 . The rear surfaces  109 A of the non-conductive material  109  are arranged so as to be approximately in the identical plane to the rear surfaces  37 A of the resin member  37 . For example, underfill resin may be used as the non-conductive material  109 . 
     According to the electronic component built-in board of this embodiment, the integration density of the electronic component built-in board  101  can be improved by mounting the electronic components  103  on the electronic components  35 . 
     Also, according to the semiconductor device of this embodiment, the integration density of the semiconductor device  100  can be improved by providing the electronic component built-in board  101  whose integration density is improved. Further, the semiconductor device  100  of this embodiment can obtain a similar effect (advantage) to that of the semiconductor device  50  of the first modified example of the first embodiment. 
       FIG. 20  through  FIG. 27  are drawings showing a manufacturing process of the electronic component built-in board according to the third embodiment of the present invention. 
     In  FIG. 20  through  FIG. 27 , the identical symbols are used for the component parts which are identical to those of the electronic component built-in board  101  of the third embodiment (shown in  FIG. 19 ). 
     Referring to  FIG. 20  through  FIG. 27 , a description will be given for the manufacturing method of the electronic component built-in board  101  of the third embodiment. In the process shown in  FIG. 20 , the electronic components  35  are provided on the support member  71  of  FIG. 5  described in the first embodiment. 
     In the process shown in  FIG. 21 , the non-conductive material  104  is formed on the electronic components  35  and, the non-conductive material  109  is formed on parts of the adhesion layer  73  corresponding to the forming area of the conductive material parts  53 . For example, underfill resin may be used as the non-conductive materials  104  and  109 . 
     Next, in the process shown in  FIG. 22 , the electronic components  103  are glued on the electronic components  35  with the non-conductive material  104 , and the conductive material parts  53  are arranged on the adhesion layer  73  so that the rear surfaces of the conductive material parts  53  contact the front surface of the adhesion layer  73 . In the case of this embodiment, the processes shown in  FIG. 20  through  FIG. 22  correspond to the arrangement process of electronic components and conductive material parts. 
     Next, in the process shown in  FIG.23 , the resin member  37  is formed on the front surface of the adhesion layer  73  so as to cover at least the sides of the electronic components  35  and the sides of the conductive material parts  53  (a resin member formation process). Specifically, the resin member  37  is formed by mounting a resin tablet (not shown) on the structure part shown in  FIG. 22  and pressing the resin tablet with a flat metal plate (not shown). At this stage, the upper sides of the electronic components  35  and  103  and the upper sides of the conductive material parts  53  are covered with the resin member  37 . Thickness of the resin member  37  shown in  FIG. 23  is thicker than that of the resin member  37  shown in  FIG. 19 . In this embodiment, a description will be given below for an example case where the resin member  37  is formed so as to cover the electronic components  35  and  103  and the conductive material parts  53 . Further, in the process shown in  FIG. 23 , the resin member  37  may be formed so as to expose the upper sides of the electronic components  103 , the upper sides of the electrodes  45  and  46 , and the upper sides of the conductive material parts  53 . 
     For example, epoxy resin or mold resin may be used as a material of the resin tablet described above. When the mold resin (a content of silicone filler or, filler of aluminum is high, for example, 70 wt % through 80 wt %) is used as the material of the resin member  37 , the difference of the thermal expansion coefficient between the electronic components  35  and the resin member  37  can be decreased. 
     Next, in the process shown in  FIG. 24 , the electronic components  103 , the upper sides of the electrodes  45  and  46 , and the upper sides of the conductive material parts  53  are exposed from the resin member  37  by removing the whole upper part of the resin member  37  of  FIG. 23  (the resin member removal process). Specifically, the electronic components  103 , the upper sides of the electrodes  45  and  46 , and the upper sides of the conductive material parts  53  are exposed from the resin member  37  by performing the ashing process for the resin member  37  of  FIG. 23  from the front surface of the resin member  37 . 
     The ashing process above may be performed, for example, by use of oxygen (O 2 ) gas having a purity of 99.99% (the oxygen gas may be mixed with argon (Ar) gas and carbon fluoride gas such as CF 4 ), with a gas flow rate of 500 sccm at radio frequency (RF) power of approximately 350 W at a frequency of 13.56 MHz under a pressure of approximately 133 Pa at a temperature ranging from approximately 90° C. to 120° C. in the process chamber. In this case, the process time may be approximately 15 min. 
     In this way, by removing the whole upper part of the resin member  37  with the ashing process, the electronic components  103 , the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53  can be exposed from the resin member  37  without causing damage to the electronic components  35  and  103 , and the conductive material parts  53 . 
     In the process shown in  FIG. 25 , the support member  71  of  FIG. 24  is removed (the support member removal process). Specifically, for example, the support member  71  is taken off from the resin member  37 . 
     Next, in the process shown in  FIG. 26 , the conductive materials  106  is formed so as to cover the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53 , and the conductive materials  107  is formed so as to cover the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  53 . For example, electroconductive paste or solder may be used as the conductive materials  106  and  107 . For example, Ag paste may be used as the electroconductive paste. For example, Sn—Ag—Cu may be used as the solder. When Ag paste is used as the conductive materials  106  and  107 , for example, the thickness of the conductive materials  106  and  107  may be approximately 30 μm. 
     Next, in the process shown in  FIG. 27 , the external connection terminals  41  are formed on the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53 , and the external connection terminals  43  are formed on the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  53 . With this, the electronic component built-in board  101  is manufactured. For example, solder may be used as the external connection terminals  41  and  43  (for example, Sn—Ag—Cu solder). In  FIG. 27 , although an example is given for a case where the solder is used for the external connection terminals  41  and  43 , the external connection terminals  41  and  43  including Au bumps and solder covering the Au bumps may be formed by providing Au bumps contacting the electrodes  45  and  46  or the conductive material parts  53  in the solder of  FIG. 27 . 
     According to the manufacturing method of the electronic component built-in board of this embodiment, the electronic components  103  is glued on the electronic components  35  arranged on the support member  71 , and the conductive material parts  53  are provided on the support member  71 . Next, the resin member  37  is formed so as to cover at least the sides of the electronic components  35  and the sides of the conductive material parts  53 . Further, the electronic components  103 , the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53  are exposed from the resin member  37 , and then the support member  71  is removed. The conductive materials  106  are formed on the upper sides of the electrodes  45  and  46  and the upper sides of the conductive material parts  53 , and the conductive materials  107  are formed on the bottom sides of the electrodes  45  and  46  and the bottom sides of the conductive material parts  53 . Next, the external connection terminals  41  are formed on the conductive materials  106 , and the external connection terminals  43  are formed on the conductive materials  107 . In this way, the electrical connection reliability of the electronic component built-in board  101  can be improved. Further, the electronic component built-in board  101  can be downsized in the thickness direction, and thus the integration density of the electronic component built-in board  101  can be improved. 
     Fourth Embodiment  
       FIG. 28  is a cross section of the semiconductor device according to the fourth embodiment of this invention. In  FIG. 28 , with respect to parts identical to those of the semiconductor device  10  of the first embodiment, the same symbols are used. 
     Referring to  FIG. 28 , the semiconductor device  120  of the fourth embodiment is formed similarly to the semiconductor device  10  of the first embodiment except that the electronic component built-in board  121  is formed instead of the electronic component built-in board  13  (see  FIG. 2 ) which is formed in the semiconductor device  10  of the first embodiment. 
     The electronic component built-in board  121  is formed similarly to the electronic component built-in board  13  except that upper pads  123 ,  124  (the first upper pads), upper pads  125  (the second upper pads), lower pads  127 ,  128  (the first lower pads) and lower pads  129  (the second lower pads) are further formed with the electronic component built-in board  13 . 
     The upper pads  123  are formed on the front surfaces of the electronic components  35  located between the electrodes  45  and the electrodes  46  so as to contact the upper parts of the electrodes  45 . 
     In this way, by forming the upper pads  123  on the front surfaces of the electronic components  35  which contact the upper parts of the electrodes  45 , the degradation of electrical connection reliability between the board connection pads  23  and the electrodes  45  can be prevented when relative misalignment occurs between the board connection pads  23  and the electrodes  45  (such as misalignment due to variation of shapes of the electronic components  35 ). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  41  (in this case, the first external connection terminals) are arranged so as to contact the upper sides of the electrodes  45  and the front surfaces of the upper pads  123 , the external connection terminals  41  may be formed so as to contact only the upper sides of the electrodes  45  or may be formed so as to contact only the front surfaces of the upper pads  123 . 
     The upper pad  124  is formed on the front surface  37 B of the resin member  37  so as to contact the upper part of the electrode  46 . 
     In this way, by forming the upper pads  124  on the front surfaces  37 B of the resin member  37  contacting the upper parts of the electrodes  46 , the degradation of electrical connection reliability between the board connection pads  23  and the electrodes  46  can be prevented when relative misalignment occurs between the board connection pads  23  and the electrodes  46  (such as misalignment due to variation of shapes of the electronic components  35 ). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  41  (in this case, the first external connection terminals) are arranged so as to contact the upper sides of the electrodes  46  and the front surfaces of the upper pads  124 , the external connection terminals  41  may be formed so as to contact only the upper sides of the electrodes  46  or may be formed so as to contact only the front surfaces of the upper pads  124 . 
     The upper pads  125  are formed on the front surfaces  37 B of the resin member  37  so as to contact the upper parts of the conductive material parts  36 . 
     In this way, by forming the upper pads  125  on the front surfaces  37 B of the resin member  37  contacting the upper parts of the conductive material parts  36 , the degradation of electrical connection reliability between the board connection pads  23  and the conductive material parts  36  can be prevented when relative misalignment occurs between the board connection pads  23  and the conductive material parts  36  (such as a case where the conductive material parts  36  are misaligned from predetermined positions while the electronic component built-in board  121  is formed). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  41  (in this case, the second external connection terminals) are arranged so as to contact the upper sides of the conductive material parts  36  and the front surfaces of the upper pads  125 , the external connection terminals  41  may be formed so as to contact only the upper sides of the conductive material parts  36  or may be formed so as to contact only the front surfaces of the upper pads  125 . 
     As the upper pads  123 - 125 , for example, an Ni/Cu stacked layer formed by sequentially stacking an Ni layer and a Cu layer, a Ti/Cu stacked layer formed by sequentially stacking a Ti layer and a Cu layer, or a Cr/Cu stacked layer formed by sequentially stacking a Cr layer and a Cu layer may be used. 
     The lower pads  127  are formed on parts of the rear surfaces of the electronic components  35  located between the electrodes  45  and the electrodes  46  so as to contact the lower sides of the electrodes  45 . In this way, by forming the lower pads  127  on the rear surfaces of the electronic components  35  contacting the lower parts of the electrodes  45 , the degradation of electrical connection reliability between the pads of a mounting board (such as a mother board, not shown) and the electrodes  45  can be prevented when relative misalignment occurs between the pads of the mounting board and the electrodes  45  (such as misalignment due to variation of shapes of the electronic components  35 ). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  43  (in this case, the third external connection terminals) are arranged so as to contact the bottom sides of the electrodes  45  and the rear surfaces of the lower pads  127 , the external connection terminals  43  may be formed so as to contact only the bottom sides of the electrodes  45  or may be formed so as to contact only the rear surfaces of the lower pads  127 . 
     The lower pads  128  are formed on the rear surfaces  37 A of the resin member  37  so as to contact the lower sides of the electrodes  46 . 
     In this way, by forming the lower pads  128  on the rear surfaces  37 A of the resin member  37  contacting the lower sides of the electrodes  46 , the degradation of electrical connection reliability between the pads of a mounting board (such as a mother board, not shown) and the electrodes  46  can be prevented when relative misalignment occurs between the pads of the mounting board and the electrodes  46  (such as misalignment due to variation of shapes of the electronic components  35 ). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  43  (in this case, the third external connection terminals) are arranged so as to contact the bottom sides of the electrodes  46  and the rear surfaces of the lower pads  128 , the external connection terminals  43  may be formed so as to contact only the bottom sides of the electrodes  46  or may be formed so as to contact only the rear surfaces of the lower pads  128 . 
     The lower pads  129  are formed on the rear surfaces  37 A of the resin member  37  so as to contact the lower sides of the conductive material parts  36 . 
     In this way, by forming the lower pads  129  on the rear surfaces  37 A of the resin member  37  contacting the lower sides of the conductive material parts  36 , the degradation of electrical connection reliability between the pads of a mounting board (such as a mother board, not shown) and the conductive material parts  36  can be prevented when relative misalignment occurs between the pads of the mounting board and the conductive material parts  36  (such as a case where the conductive material parts  36  are misaligned from predetermined positions while the electronic component built-in board  121  is formed). 
     In  FIG. 28 , although a description is given for an example case where the external connection terminals  43  (in this case, the fourth external connection terminals) are arranged so as to contact the lower sides of the conductive material parts  36  and the rear surfaces of the lower pads  129 , the external connection terminals  43  may be formed so as to contact only the lower sides of the conductive material parts  36  or may be formed so as to contact only the rear surfaces of the lower pads  129 . 
     As the lower pads  127 - 129 , for example, a Ni/Cu stacked layer formed by sequentially stacking an Ni layer and a Cu layer, a Ti/Cu stacked layer formed by sequentially stacking a Ti layer and a Cu layer, or a Cr/Cu stacked layer sequentially stacking a Cr layer and a Cu layer may be used. 
     According to the electronic component built-in board of this embodiment, the upper pads  123  are formed on the front surface of the electronic components  35  so as to contact the upper part of the electrodes  45 , the upper pads  124  are formed on the front surface  37 B of the resin member  37  so as to contact the upper part of the electrodes  46 , and the upper pads  125  are formed on the front surface  37 B of the resin member  37  so as to contact the upper part of the conductive material parts  36 . With this, the degradation of the electrical connection reliability between the board connection pads  23  and the electrodes  45  and  46 , and the conductive material parts  36  can be prevented when relative misalignment between the board connection pads  23  and the electrodes  45  and  46  occurs, or when a relative misalignment between the board connection pads  23  and the conductive material parts  36  occurs. 
     Further, the lower pads  127  are formed on the rear surfaces of the electronic components  35  contacting the lower sides of the electrodes  45 , the lower pads  128  are formed on the rear surfaces  37 A of the resin member  37  contacting the lower sides of the electrodes  46 , and the lower pads  129  are formed on the rear surfaces  37 A of the resin member  37  contacting the lower sides of the conductive material parts  36 . With this, the degradation of electrical connection reliability between the pads of the mounting board and the electrodes  45  and  46  and between the pads of the mounting board and the conductive material parts  36  can be prevented when relative misalignment occurs between the pads of the mounting board (such as a mother board, not shown) and the electrodes  45  and  46  or when relative misalignment occurs between the pads of the mounting board (such as a mother board, not shown) and the conductive material parts  36 . 
     According to the semiconductor device of this embodiment, by providing the electronic component built-in board  121  formed by the structure described above, the electrical connection reliability of the semiconductor device  120  can be improved, and the electrical connection reliability between the semiconductor device  120  and a mounting board (such as a mother board, not shown) electrically connected to the semiconductor device  120  and the conductive material parts  36  can be prevented. 
     Further, instead of the conductive material parts  36  provided for the electronic component built-in board  121  of this embodiment, the conductive material parts  53  described above (see  FIG. 19 ) may be provided. 
       FIG. 29  is a cross section of the electronic component built-in board according to a modified example of the fourth embodiment of this invention. 
     Referring to  FIG. 29 , an electronic component built-in board  135  of the modified example of the fourth embodiment is formed similarly to the electronic component built-in board  121  except that a resin member  136  is provided instead of the resin member  37  provided for the electronic component built-in board  121  of the fourth embodiment. 
     The resin member  136  is formed similarly to the resin member  37  except that opening parts  137 A,  137 B,  137 C,  138 A,  138 B and  13 SC are formed, and their profiles are thicker than that of the resin member  37 . 
     The opening part  137 A is formed to expose the front surface of the upper pad  125  and part of the upper side of the conductive material part  36 . The opening part  137 B is formed to expose the front surface of the upper pad  123  and part of the upper side of the conductive material part  45 . The opening part  137 C is formed to expose the front surface of the upper pad  124  and part of the upper side of the conductive material part  46 . The opening parts  137 A,  137 B,  137 C accommodate parts of the external connection terminals  41 . 
     The opening part  138 A is formed to expose the rear surface of the lower pad  129  and part of the bottom side of the conductive material parts  36 . The opening part  138 B is formed to expose the rear surface of the lower pad  127  and part of the bottom side of the conductive material part  45 . The opening part  138 C is formed to expose the rear surface of the lower pad  128  and part of the bottom side of the electrodes  46 . The opening parts  138 A,  138 B,  138 C accommodate parts of the external connection terminals  43 . 
     According to the electronic component built-in board of the modified example of this embodiment, the opening parts  137 A,  137 B, and  137 C accommodating parts of the external connection terminals  41  are formed in the resin member  136  whose profile is thicker than the resin member  37 , so the parts of the resin member  136  of the opening parts  137 A,  137 B and  137 C regulate positions of the external connection terminals  41 , and thus the adjacent external connection terminals  41  can be prevented from short circuiting. 
     Further, the opening parts  138 A,  138 B, and  138 C accommodating parts of the external connection terminals  43  are formed in the resin member  136  whose profile is thicker than the resin member  37 , so the parts of the resin member  136  of the opening parts  138 A,  138 B and  138 C regulate positions of the external connection terminals  43 , and thus the adjacent external connection terminals  43  can be prevented from short circuiting. 
     Instead of the conductive material parts  36  formed in the electronic component built-in board  135  of this embodiment, the conductive material parts  53  described in  FIG. 19  may be formed. 
       FIG. 30  and  FIG. 31  are drawings showing a manufacturing process of the electronic component built-in board according to the fourth embodiment of this invention. In  FIG. 30  and  FIG. 31 , with respect to parts which are identical to those used in the electronic component built-in board  121  of the fourth embodiment, the same symbols are assigned. 
     Referring to  FIG. 30  and  FIG. 31 , a description will be given for a manufacturing method of the electronic component built-in board  135  of the fourth embodiment. Firstly, processes similar to those of  FIG. 5  through  FIG. 10  described in the first embodiment are performed. 
     In the process shown in  FIG. 30 , the upper pads  123 - 125  and the lower pads  127 - 129  are formed (the upper pads and lower pads formation process). Specifically, for example, the upper pads  123 - 125  and the lower pads  127 - 129  may be formed by a semi-additive method. In this case, an Ni/Cu stacked layer formed by sequentially stacking an Ni layer (for example, approximately 5 μm thick) and a Cu layer (for example, approximately 3 μm thick) may be used as the upper pads  123 - 125  and the lower pads  127 - 129 . 
     Further, the upper pads  123 - 125  and the lower pads  127 - 129  may be formed by etching formed metal films. As the lower pads  123 - 125 , for example, a Ti/Cu stacked layer formed by sequentially stacking a Ti layer (for example, approximately 0.1 μm thick) and a Cu layer (for example, approximately 0.5 μm thick) or a Cr/Cu stacked layer formed by sequentially stacking a Cr layer (for example, approximately 0.1 μm thick) and a Cu layer (for example, approximately 0.5 μm thick) may be used. 
     In the process shown in  FIG. 30 , at least one of the upper pads and one of the lower pads with respect to the upper pads  123 - 125  and the lower pads  127 - 129  may be formed. 
     In the process shown in  FIG. 31 , the external connection terminals  41  and  43  may be formed. With this, the electronic component built-in board  135  is manufactured. 
     According to the manufacturing method of the electronic component built-in board of this embodiment, by forming the upper pads  123 - 125  before forming the external connection terminals  41 , it becomes possible that part or all of the external connection terminals  41  are mounted on the upper pads  123 - 125  even if the forming area of the external connection terminals  41  is misaligned, and thus the electrical connection reliability of the electronic component built-in board  135  can be improved. 
     Further, by forming the lower pads  127 - 129  before forming the external connection terminals  43 , it becomes possible that part or all of the external connection terminals  43  are mounted on the lower pads  127 - 129  even if the forming area of the external connection terminals  43  is misaligned, and thus the electrical connection reliability of the electronic component built-in board  135  can be improved. 
     Fifth Embodiment  
       FIG. 32  is a cross section of the semiconductor device according to the fifth embodiment of this invention. In  FIG. 32 , parts identical to those of the semiconductor device  120  of the fourth embodiment are identified by identical symbols. 
     Referring to  FIG. 32 , a semiconductor device  140  of the fifth embodiment is formed similarly to the semiconductor device  120  of the fourth embodiment except that an electronic component built-in board  141  is provided instead of the electronic component built-in board  121  formed in the semiconductor device  120  of the fourth embodiment. 
     The electronic component built-in board  141  is formed similarly to the electronic component built-in board  121  except that external connection terminals  143  and  144  are provided instead of the external connection terminals  41  and  43  formed in the electronic component built-in board  121 . 
     In the present embodiment, the first external connection terminals are the external connection terminals  143  formed so as to contact the upper sides of the electrodes  45  and the front surface of the upper pads  123 , and the external connection terminals  143  formed so as to contact the upper sides of the electrodes  46  and the front surface of the upper pads  124 . The second external connection terminals are the external connection terminals  143  formed so as to contact the upper sides of the conductive material parts  36  and the front surface of the upper pads  125 . 
     Further, the third external connection terminals are the external connection terminals  144  formed so as to contact the bottom sides of the electrodes  45  and the rear surfaces of the lower pads  127 , and the external connection terminals  144  formed so as to contact the bottom sides of the electrodes  46  and the rear surfaces of the lower pads  128 . The fourth external connection terminals are the external connection terminals  144  formed so as to contact the bottom sides of the conductive material parts  36  and the rear surfaces of the lower pads  129 . 
     The external connection terminals  143  include Au bumps  146  and solder  147 . The Au bumps  146  are arranged on the upper pads  123 - 125 . The upper sides of the Au bumps  146  are connected to the board connection pads  23 . The solder  147  is formed between the board connection pads  23  and the upper pads  123 - 125  so as to cover the side of the Au bumps  146 . For example, solder (for example, Sn—Ag—Cu solder) may be used as the solder  147 . 
     The external connection terminals  144  include Au bumps  148  and solder  149 . The Au bumps  148  are arranged on the lower pads  127 - 129 . The lower sides of the Au bumps  148  are connected to the pads of a mounting board (such as a mother board, not shown). The solder  149  is formed on the lower pads  127 - 129  so as to cover the Au bumps  148 . For example, solder (for example, Sn—Ag—Cu solder) may be used as the solder  149 . 
     According to the electronic component built-in board of this embodiment, the external connection terminals  143  including the Au bumps  146  and the solder  147  are provided, and the upper sides of the Au bumps  146  are electrically connected to the board connection pads  23  via the external connection terminals  143 . With this, the electrical connection reliability between the wiring board  11  and the electronic component built-in board  141  can be improved. 
     The external connection terminals  144  including the Au bumps  148  and the solder  149  are provided, and a mounting board (such as a mother board, not shown) and the electronic component built-in board  141  are connected via the external connection terminals  144 . With this, the electrical connection reliability between the mounting board (not shown) and the electronic component built-in board  141  can be improved. 
       FIG. 33  is a cross section of the electronic component built-in board according to a modified example of the fifth embodiment of this invention. In  FIG. 33 , parts identical to those of the electronic component built-in board  141  of the fifth embodiment are identified by identical reference symbols. 
     Referring to  FIG. 33 , an electronic component built-in board  155  of the modified example of the fifth embodiment is formed similarly to the electronic component built-in board  141  except that the resin member  136  included the electronic component built-in board  135  of the modified example of the fourth embodiment (see  FIG. 29 ) is provided instead of the resin member  37  formed in the electronic component built-in board  141  of the fifth embodiment. 
     The electronic component built-in board  155  formed as described above can obtain a similar effect to that of the electronic component built-in board  141  of the fifth embodiment. 
     According to this invention, the electronic component built-in board includes the electronic components having the electrodes, the conductive material parts arranged in the identical plane to that of the electronic components, and the resin member supporting the electronic components and the conductive material parts and exposing the upper sides and bottom sides of the electrodes, the upper sides and the bottom sides and the conductive material parts. With this, compared to the related art electronic component built-in board including the wiring patterns electrically connected to the insulating layer and the electronic components on the upper side and rear side of the electronic components, the electrical connection reliability of the electronic component built-in board can be improved, and the electronic component built-in board can be downsized in the thickness direction. 
     According to this invention, the electrical connection reliability of the semiconductor device can be improved, and the semiconductor device can be downsized in the thickness direction. 
     According to this invention, the electronic components and the conductive material parts are provided on the support member, and the resin member is formed so as to cover at least the side of the electronic components and the side of the conductive material parts. Further, the upper sides of the electrodes and the upper sides of the conductive material parts are exposed from the resin member, and then the support member is removed. With this manufacturing process, the electrical connection reliability of the electronic component built-in board can be improved, and the electronic component built-in board can be downsized in the thickness direction. 
     According to this invention, the electrical connection reliability of the electronic component built-in board can be improved and the electronic component built-in board can be downsized in the thickness direction. 
     Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teachings herein set forth. 
     For example, Ag paste or solder may be provided on the electrodes  45  and  46  of the electronic components  35  and the conductive material parts  35  and  53 . With this, the external connection terminals  41  having various diameters can be mounted on the electrodes  45  and  46  of the electronic components  35  and the conductive material parts  35  and  53  via the Ag paste. 
     Further, the conductive material parts  36  and  53  may be used as electrical lines when necessary. 
     The present invention may be applied to an electronic component built-in board including electronic components, a manufacturing method thereof and a semiconductor device. 
     This patent application is based on Japanese Priority Patent Application No. 2008-068532 filed on Mar. 17, 2008, the entire contents of which are hereby incorporated by reference.