Patent Publication Number: US-2022216122-A1

Title: Electronic device

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is a continuation application of International Patent Application No. PCT/JP2020/036484 filed on Sep. 25, 2020, which designated the U.S. and claims the benefit of priority from Japanese Patent Application No. 2019-176914 filed on Sep. 27, 2019. The entire disclosures of all of the above applications are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an electronic device including a semiconductor device in which a semiconductor element is sealed by a resin mold, a wiring board, and a housing. 
     BACKGROUND 
     An electronic device including a wiring board, a housing, and a semiconductor device in which a semiconductor element is sealed by a resin mold is known. 
     SUMMARY 
     An electronic device according to the present disclosure includes a semiconductor device including a semiconductor element, a resin mold sealing the semiconductor element, a wiring board including a wiring portion on which the semiconductor device is mounted and a resist portion disposed around the wiring portion, a heat dissipating member in thermal contact with at least one of surfaces the semiconductor device, and a housing in thermal contact with the semiconductor device through the heat dissipating member. Each of the resin mold and the heat dissipating member has a thermal conductivity higher than that of the resist portion. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings: 
         FIG. 1  is a top plan view of an electronic device according to a first embodiment; 
         FIG. 2  is a cross-sectional view taken along a line II-II of  FIG. 1 ; 
         FIG. 3  is a cross-sectional view of an electronic device according to a second embodiment; 
         FIG. 4  is a cross-sectional view of an electronic device according to a third embodiment; 
         FIG. 5  is a cross-sectional view of an electronic device according a fourth embodiment; 
         FIG. 6  is a cross-sectional view of an electronic device according to a modified example; 
         FIG. 7  is a cross-sectional view of an electronic device according to a modified example; 
         FIG. 8  is a cross-sectional view of an electronic device according to a fifth embodiment; 
         FIG. 9  is a cross-sectional view of an electronic device according to a modified example; and 
         FIG. 10  is a cross-sectional view of an electronic device according to a modified example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     To begin with, examples of relevant techniques will be described. 
     The present disclosure relates to an electronic device including a semiconductor device in which a semiconductor element is sealed by a resin mold, a wiring board, and a housing. 
     An electronic device including a wiring board, a housing, and a semiconductor device in which a semiconductor element is sealed by a resin mold is known. In the electronic device, the semiconductor device arranged on the wiring board is covered with a heat conductive member, and the housing is in contact with the upper surface (i.e., the surface facing the wiring board) of a heat dissipating member. 
     The heat generated in the semiconductor element is dissipated to the housing or the wiring board. The heat of the semiconductor element is dissipated to the housing through the resin mold covering the semiconductor element and the heat dissipating member. However, heat dissipation amount to the housing is not sufficient and it is necessary to secure a sufficient heat dissipation amount to the wiring board. 
     In view of the above, it is an objective of the present disclosure to provide an electronic device having high heat dissipation performance with an improved heat dissipation amount to the housing. 
     The first electronic device according to the present disclosure includes a semiconductor device including a semiconductor element, a resin mold sealing the semiconductor element, a wiring board including a wiring portion on which the semiconductor device is mounted and a resist portion disposed around the wiring portion, a heat dissipating member in thermal contact with at least one of surfaces the semiconductor device, and a housing in thermal contact with the semiconductor device through the heat dissipating member. Each of the resin mold and the heat dissipating member has a thermal conductivity higher than that of the resist portion. 
     According to the first electronic device according to the present disclosure, since each of the resin mold and the heat dissipating member has higher thermal conductivity than that of the resist portion, heat conductivity in a heat dissipation path from the semiconductor element to the housing via the resin mold and the heat dissipating member is higher than that in a heat dissipation path from the semiconductor element to the wiring board through the resist portion. Therefore, it is possible to provide an electronic device having high heat dissipation performance with an improved heat dissipation amount to the housing. 
     First Embodiment 
     As shown in  FIGS. 1 and 2 , an electronic device  10  according to a first embodiment includes a semiconductor device  100 , a wiring board  110 , a heat dissipating member  130 , and a housing  140 . The x-axis direction and the y-axis direction shown in  FIGS. 1 and 2  are lateral directions of the electronic device  10  and each configuration of the electronic device  10  such as the semiconductor device  100 . The xy plane direction is the plane direction of the electronic device  10  and each configuration of the electronic device  10  such as the semiconductor device  100 . The z-axis direction is a vertical direction perpendicular to the plane direction. 
     The semiconductor device  100  includes a semiconductor element  101 , a first conductive member  102  in contact with the upper surface of the semiconductor element  101 , a second conductive member  103  in contact with the lower surface of the semiconductor element, a connecting member  104 , a resin mold  105  sealing the semiconductor element  101 . 
     As shown in  FIG. 1 , the resin mold  105  has a substantially rectangular shape in a top view and the semiconductor device  100  has an appearance in which four external terminals protrude beyond each of the side surfaces of the resin mold  105  facing in the y direction. A vertical trench gate type power MOSFET (i.e., Metal-Oxide-Semiconductor Field-Effect Transistor) is formed in the semiconductor element  101 . 
     The first conductive member  102  on the upper surface of the semiconductor element  101  is electrically connected to the source electrode and the external terminals of the semiconductor element  101 . The second conductive member  103  on the lower surface is electrically connected to the drain electrode of the semiconductor element  101  and is also electrically connected to the wiring board  110  via the connecting member  104 . The first conductive member  102  is clips connected to the external terminals, but the first conductive member  102  may be a wire bonding, a wire ribbon, or the like connected to the external terminals instead of the clips. A material of the semiconductor substrate is not particularly limited, but silicon (Si), silicon carbide (SiC), gallium nitride (GaN), or the like can be exemplified. 
     The wiring board  110  includes a base portion  111 , a wiring portion  112  on which the semiconductor device  100  is mounted, and a resist portion  113  provided around the wiring portion  112 . The wiring portion  112  and the resist portion  113  are disposed on the upper surface of the base portion  111 , so that a wiring pattern is formed. The connecting member  104  is provided in contact with the upper surface of the conductive wiring portion  112 , and the second conductive member  103  is provided on the surface of the connecting member  104 . The connecting member  104  is made of, for example, a solder material, and the semiconductor device  100  is fixed to the upper surface of the wiring portion  112  via the connecting member  104 . The resist portion  113  is made of a resist resin material such as an epoxy resin. 
     The heat dissipating member  130  is a gel-like insulating material provided between the wiring board  110 , the semiconductor device disposed on the wiring board  110 , and the housing  140 . The heat dissipating member  130  has a flat surface portion  134  in contact with the upper surface  100   a  of the semiconductor device  100  and a side surface portion  133  in contact with the side surfaces  100   b  of the semiconductor device  100 . The lower end of the side surface portion  133  is in contact with the upper surface of the wiring board  110 . The height of the heat dissipating member  130  is higher than the height of the semiconductor device  100 , so that the heat dissipating member  130  covers the upper surface  100   a,  the entire side surfaces, and a part of the lower surface of the semiconductor device  100 . The heat dissipating member  130  further covers the side surfaces of the connecting member  104  and a part of the upper surface of the wiring board  110 . The height of the semiconductor device  100  is the distance between the upper surface  100   a  and the lower surface  100   c  facing the upper surface  100   a.  In other words, the height of the semiconductor device  100  is the height of the upper surface  100   a  with respect to the lower surface  100   c.  The height of the heat dissipating member  130  is the distance between the upper surface  131  of the flat surface portion  134  and the lower end surface of the side surface portion  133 . In other words, the height of the heat dissipating member  130  is the height of the upper surface  131  relative to the lower end surface of the side surface portion  133 . 
     The housing  140  is in thermal contact with the semiconductor device  100  via the heat dissipating member  130 . The housing  140  is made of a metal such as aluminum. The housing  140  includes a flat surface portion  141  and a side surface portion  142 . The side surface portion  142  protrudes downward (toward the wiring board) from the flat surface portion  141 , and the height of the side surface portion  142  is higher than the height of the upper surface  100   a  relative to the lower surface of the semiconductor device  100 . The flat surface portion  141  is provided at a position facing the upper surface  100   a  of the semiconductor device  100 . The side surface portion  142  is provided at a position facing the side surface  100   b  that is not parallel with the upper surface  100   a  and the lower surface of the semiconductor device  100 . The flat surface portion  141  is in contact with the upper surface  131  of the flat surface portion  134  of the heat dissipating member  130 , and the side surface portion  142  is in contact with the outer surface of the side surface portion  133  of the heat dissipating member  130  (i.e., the surface facing in the negative direction of the x-axis shown in  FIG. 2 ). The side surface portion  133  of the heat dissipating member  130  extends below the lower end surface of the side surface portion  142  of the housing  140 , and the side surface portion  142  of the housing  140  is in thermal contact with the upper surface of the wiring board  110  (more specifically, the upper surface of the resist portion  113 ) via the side surface portion  133  of the heat dissipating member  130 . 
     The resin mold  105  is made of a high heat dissipation resin material obtained by mixing a resin material such as an epoxy resin with a filler or the like for improving heat dissipation. The heat dissipating member  130  is made of a gel-like high heat dissipation material obtained by mixing a resin material, a silicon material, or the like with a filler or the like for improving heat dissipation. As the filler used for the high heat dissipation resin material and the gel-like high heat dissipation material, for example, a composite oxide material having high thermal conductivity such as alumina is selected. By adjusting the type and filling rate of the filler, the thermal conductivity of the resin mold  105  and the heat dissipating member  130  can be adjusted. The high heat dissipation resin material and the gel-like high heat dissipation material are selected so that the thermal conductivity of each of the resin mold  105  and the heat dissipating member  130  is higher than that of the resist portion  113 . When the thermal conductivity of the resin mold  105  is defined as km, the thermal conductivity of the heat dissipating member  130  is defined as kg, and the thermal conductivity of the resist portion  113  is defined as kr, kr≤1 W/(m·K), km&gt;1 W/(m·K) and kg≥3 W/(m·K) are satisfied in this embodiment. The thermal conductivity of the housing  140  made of aluminum is about 100 to 300 W/(m·K), which is remarkably high with respect to km, kg, and kr. 
     As described above, according to the electronic device  10  of the first embodiment, kr≤1 W/(m·K), km&gt;1 W/(m·K), kg≥3 W/(m·K), so that each of the resin mold  105  and the heat dissipating member  130  has thermal conductivity higher than that of the resist portion  113 . Therefore, the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the housing  140  via the resin mold  105  and the heat dissipating member  130  is higher than that in the heat dissipation path from the semiconductor element  101  to the wiring board  110  via the resist portion  113 . Therefore, it is possible to provide an electronic device  10  having a high heat dissipation performance in which the heat dissipation amount to the housing  140  is improved. 
     In the first embodiment, kr≤1 W/(m·K), whereas km&gt;1 W/(m·K) and kg≥3 W/(m·K). However, the present disclosure is not limited to this. For example, while kr≤1 W/(m·K), km≥3 W/(m·K) and kg&gt;1 W/(m·K) may be satisfied. Alternatively, while kr≤1 W/(m·K), km≥3 W/(m·K) and kg≥3 W/(m·K) may be satisfied. Further, while kr≤1 W/(m·K), km&gt;1 W/(m·K) and kg&gt;1 W/(m·K) may be satisfied. In order to improve the heat dissipation amount to the housing and obtain an electronic device with high heat dissipation performance, it is sufficient to satisfy km&gt;kr and kg&gt;kr, and it is preferable that at least one of km and kg is three times or more of kr. That is, it is preferable that one or both of km≥3 kr and kg≥3 kr are satisfied. 
     Further, the housing  140  is in thermal contact with the semiconductor device  100  via the heat dissipating member  130 . More specifically, the flat surface portion  141  of the housing  140  facing the upper surface  100   a  of the semiconductor device  100  is in thermal contact with the upper surface  100   a  of the semiconductor device  100  via the flat surface portion  134  of the heat dissipating member  130 . Therefore, heat is efficiently dissipated from the upper surface  100   a  of the semiconductor device  100  to the flat surface portion  141  of the housing  140  via the flat surface portion  134  of the heat dissipating member  130  having a higher thermal conductivity than the resist portion  113 . 
     Further, the side surface portion  142  of the housing  140  facing the side surface  100   b  of the semiconductor device  100  is in thermal contact with the side surface  100   b  of the semiconductor device  100  via the side surface portion  133  of the heat dissipating member  130 . Therefore, heat is efficiently dissipated from the side surface  100   b  of the semiconductor device  100  to the side surface portion  142  of the housing  140  via the side surface portion  133  of the heat dissipating member  130  having a higher thermal conductivity than the resist portion  113 . In addition to the heat dissipation path via the flat surface portion  141  and the flat surface portion  134 , the heat dissipation path via the side surface portion  142  and the side surface portion  133  is provided, so that the heat dissipation amount to the housing  140  can be further improved. 
     Further, the side surface portion  142  of the housing  140  can restrict the position of the heat dissipating member  130  in the lateral direction (more specifically, the x direction). Thus, the effect of restricting the heat dissipating member  130  from being offset in the lateral direction can be obtained. 
     Further, the side surface portion  133  of the heat dissipating member  130  is also located between the side surface portion  142  of the housing  140  and the wiring board  110 . Therefore, even in the region of the semiconductor device  100  close to the wiring board  110 , the thermal conductivity in the heat dissipating path to the housing  140  can be improved, which can contribute to the improvement of the heat dissipation performance of the electronic device  10 . 
     Second Embodiment 
     In each of the following embodiments, portions different from the embodiments having been already described will be described. As shown in  FIG. 3 , an electronic device  20  according to the second embodiment includes a semiconductor device  200 , the wiring board  110 , a heat dissipating member  230 , and a housing  240 . Since the wiring board  110  and the semiconductor element  101 , the first conductive member  102 , the second conductive member  103 , and the connecting member  104  in the semiconductor device  200  are the same as those in the first embodiment, the description thereof will be omitted. The material of each component is the same as that of the first embodiment. 
     The semiconductor device  200  includes a resin mold  205  instead of the resin mold  105 . The upper surface of the resin mold  205  has a recess  206 . The recess  206  may be formed by laser printing or the like. 
     The heat dissipating member  230  includes side surface portions  233  and  235  and a fitting portion  236 . The heat dissipating member  230  is not provided at a position on the upper surface of the semiconductor device  200  except for the recess  206 . The fitting portion  236  is fit into the recess  206  of the resin mold  205 . 
     The housing  240  includes a flat surface portion  241  and side surface portions  242  and  243 . The side surface portions  242  and  243  face each other in the x-axis direction, and extend so as to sandwich the semiconductor device  200  and the heat dissipating member  230  from both sides of the semiconductor device  200  and the heat dissipating member  230  in the x-axis direction. The outer surface  232  of the heat dissipating member  230  is in contact with the side surface portion  242 . Similarly, the opposite outer surface of the heat dissipating member  230  facing the side surface portion  243  is in contact with the side surface portion  243 . 
     The flat surface portion  241  of the housing  240  is in contact with the upper surface of the semiconductor device  200 , that is, the upper surface of the resin mold  205 . The flat surface portion  241  is in contact with the upper end surfaces of the side surface portions  233  and  235  and the upper surface of the fitting portion  236 . The side surface portions  233  and  235  extend below the lower end surfaces of the side surface portions  242  and  243 , respectively. The side surface portions  242  and  243  of the housing  240  are in thermal contact with the side surfaces of the semiconductor device  200  and a part of the wiring board  110  via the side surface portions  233  and  235  of the heat dissipating member  230 . 
     As described above, according to the second embodiment, since the flat surface portion  241  of the housing  240  is in direct contact with a part of the upper surface of the resin mold  205 , heat dissipation from the upper surface of the semiconductor device  200  to the flat surface portion  241  of the housing  340  via the resin mold  205  can be promoted. 
     Further, the housing  240  includes the side surface portions  242  and  243  facing each other in the x-axis direction, and the heat dissipating member  230  includes the side surface portions  233  and  235  facing each other in the x-axis direction. In addition to the heat dissipation path from the side surface of the semiconductor device  200  facing in the negative direction of the x-axis to the side surface portion  242  of the housing  240  via the side surface portion  233  of the heat dissipating member  230 , heat of the semiconductor device  200  is dissipated in the heat dissipation path from the side surface of the semiconductor device  200  facing in the positive direction of the x-axis to the side surface portion  243  of the housing  240  via the side surface portion  235  of the heat dissipating member  230 . Therefore, the heat dissipation amount to the housing  240  can be further improved. Further, the position of the heat dissipating member  230  can be more appropriately regulated by the side surface portions  242  and  243  facing each other in the x-axis direction, and the misalignment of the heat dissipating member  230  can be suppressed. The housing may further include one or two side surface portions facing in the y-axis direction in addition to the side surface portions  242  and  243  facing in the x-axis direction. Alternatively, the side surface portion of the housing may be configured as a continuous side surface portion surrounding the outer surface of the semiconductor device  200  and the heat dissipating member  230 . 
     Further, according to the electronic device  20  of the second embodiment, each of the resin mold  205  and the heat dissipating member  230  has higher thermal conductivity than the resist portion  113  as in the first embodiment. Therefore, the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the housing  240  via the resin mold  205  and the heat dissipating member  230  can be higher than the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the wiring board via the resist portion  113 . Therefore, it is possible to provide the electronic device  20  having a high heat dissipation performance in which the heat dissipation amount to the housing  240  is improved. 
     Third Embodiment 
     As shown in  FIG. 4 , the electronic device  30  according to the third embodiment includes a semiconductor device  300 , the wiring board  110 , a heat dissipating member  330 , and a housing  340 . Since the wiring board  110  and the semiconductor element  101 , the first conductive member  102 , the second conductive member  103 , and the connecting member  104  in the semiconductor device  300  are the same as those in the first embodiment, the description thereof will be omitted. The material of each component is the same as that of the first embodiment. 
     The semiconductor device  300  includes a resin mold  305  instead of the resin mold  105 . The upper surface of the resin mold  305  defines a recess  306  that reaches the upper surface of the first conductive member  102 . That is, the first conductive member  102  has, on the upper surface, an exposed portion that is not covered with the resin mold  305 . 
     The heat dissipating member  330  includes a flat surface portion  334 , side surface portions  333  and  335 , and a fitting portion  336 . The flat surface portion  334  has the same thickness as the flat surface portion  134  of the first embodiment, and the fitting portion  336  protrudes downward from a part of the lower surface of the flat surface portion  334 . The fitting portion  336  is fit into the recess  306  of the resin mold  305  and is in contact with the upper surface of the first conductive member  102  of the semiconductor device  300 . Since the configurations of the side surface portions  333  and  335  are the same as those of the side surface portions  233  and  235  of the second embodiment, the description thereof will be omitted. 
     The housing  340  includes a flat surface portion  341  and side surface portions  342  and  343 . Since the configuration of the housing  340  is the same as that of the housing  240  of the second embodiment, the description thereof will be omitted. The upper surface  331  of the heat dissipating member  330  is in contact with the flat surface portion  341  of the housing  340 , and the outer surface  332  of the heat dissipating member  330  is in contact with the side surface portion  342 . Similarly, the opposite outer surface of the heat dissipating member  330  facing the side surface portion  343  is in contact with the side surface portion  343 . The flat surface portion  341  of the housing  340  is in thermal contact with the upper surface of the semiconductor device  300  via the flat surface portion  334  of the heat dissipating member  330 . The side surface portions  342  and  343  of the housing  340  are in thermal contact with the side surfaces of the semiconductor device  300  and a part of the wiring board  110  via the side surface portions  333  and  335  of the heat dissipating member  330 . 
     As described above, according to the third embodiment, the first conductive member  102  of the semiconductor device  300  has an exposed part that is not covered with the resin mold  305 . The fitting portion  336  of the heat dissipating member  230  is in contact with the upper surface of the first conductive member  102  of the semiconductor device  300 . Since the material of the first conductive member  102  is a metal electrode material and has a higher thermal conductivity than the resin mold  305 , heat of the semiconductor device  300  is efficiently dissipated to the heat dissipating member  330  via the first conductive member  102 . As a result, the heat dissipation amount to the housing  340  can be improved. 
     Further, according to the electronic device  30  of the third embodiment, each of the resin mold  305  and the heat dissipating member  330  has higher thermal conductivity than the resist portion  113  as in the first embodiment. Therefore, the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the housing  340  via the resin mold  305  and the heat dissipating member  330  can be higher than the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the wiring board via the resist portion  113 . Therefore, it is possible to provide the electronic device  30  having a high heat dissipation performance in which the heat dissipation amount to the housing  340  is improved. 
     Further, according to the electronic device  30  of the third embodiment, as in the second embodiment, the housing  340  includes the side surface portions  342  and  343 , and the heat dissipating member  330  includes the side surface portions  333  and  335 . Since heat of the semiconductor device  300  is dissipated in both of the positive direction and the negative direction of the x-axis, the heat dissipation amount to the housing  340  can be further improved. Further, the position of the heat dissipating member  330  can be more appropriately regulated from both sides of the heat dissipating member  330  in the x-axis direction, and the misalignment of the heat dissipating member  330  can be suppressed. 
     Fourth Embodiment 
     As shown in  FIG. 5 , an electronic device  40  according to a fourth embodiment includes a semiconductor device  400 , the wiring board  110 , a heat dissipating member  430 , and a housing  440 . Since the wiring board  110  and the semiconductor element  101 , the first conductive member  102 , the second conductive member  103 , and the connecting member  104  in the semiconductor device  400  are the same as those in the first embodiment, the description thereof will be omitted. The material of each component is the same as that of the first embodiment. 
     The semiconductor device  400  includes a resin mold  405  instead of the resin mold  105 . The upper surface of the resin mold  405  has a recess  406  and the first conductive member  102  of the semiconductor device  400  passes through the recess  406  of the resin mold  405  and protrudes beyond the upper surface of the resin mold  405 . In the semiconductor device  400 , the upper surface of the resin mold  405  is located lower than the upper surface of the first conductive member  102 . 
     The heat dissipating member  430  includes a flat surface portion  434 , side surface portions  433 ,  435 , and a recess  436 . The flat surface portion  434  has the same thickness as the flat surface portion  134  of the first embodiment, and the lower surface of the flat surface portion  434  has the recess  436  recessed upward. Thus, the thickness of a part of the flat surface portion  434  defining the recess  436  is reduced. The upper portion of the first conductive member  102  of the semiconductor device  400  is fit into and in contact with the recess  436 . 
     The housing  440  includes a flat surface portion  441  and side surface portions  442  and  443 . The side surface portions  442  and  443  face each other in the x-axis direction, and extend to sandwich the semiconductor device  400  and the heat dissipating member  430  from both sides of the semiconductor device  400  and the heat dissipating member  430  in the x-axis direction. The lower end surfaces of the side surface portions  442  and  443  extend to be in contact with the upper surface of the wiring board  110 . The side surface portions  433  and  435  of the heat dissipating member  430  do not extend below the lower end surfaces of the side surface portions  442  and  443  of the housing  440 . 
     The upper surface  431  of the heat dissipating member  430  is in contact with the flat surface portion  441  of the housing  440 , and the outer surface  432  of the heat dissipating member  430  is in contact with the side surface portion  442  of the housing  440 . Similarly, the opposite outer surface of the heat dissipating member  430  facing the side surface portion  443  is in contact with the side surface portion  443  of the housing  440 . The flat surface portion  441  of the housing  440  is in thermal contact with the upper surface of the semiconductor device  400  via the flat surface portion  434  of the heat dissipating member  430 . The side surface portions  442  and  443  of the housing  440  are in thermal contact with the side surfaces of the semiconductor device  400  via the side surface portions  433  and  435  of the heat dissipating member  430 . The side surface portions  442  and  443  of the housing  440  are further in direct contact with a part of the wiring board  110 . 
     As described above, according to the fourth embodiment, the first conductive member  102  of the semiconductor device  400  protrudes beyond the resin mold  405 . The flat surface portion  441  of the housing  440  is in thermal contact with the upper surface of the first conductive member  102  of the semiconductor device  400  via a part of the heat dissipating member  430  defining the recess  436  and having a relatively thin thickness. Since the material of the first conductive member  102  is a metal electrode material and has a higher thermal conductivity than the resin mold  405 , heat of the semiconductor device  400  can be efficiently dissipated to the heat dissipating member  430  via the first conductive member  102 . Further, since a part of the heat dissipating member  430  defining the recess  436  has a relatively thin thickness and the heat dissipation path from the upper surface of the semiconductor device  400  to the flat surface portion  441  of the housing  440  is shortened, heat dissipation to the housing  440  can be further promoted. 
     In the semiconductor device  400 , it is preferable that the upper surface of the first conductive member  102  is insulated by insulating plating or the like. By insulating the upper surface of the first conductive member  102 , the thickness of a part of the heat dissipating member  430  defining the recess  436  can be further thinned. 
     Further, the height of each of the side surface portions  442  and  443  protruding from the flat surface portion  441  of the housing  440  (more specifically, the height from the lower surface of the flat surface portion  441  to the lower end surface of each of the side surface portions  442  and  443 ) is higher than the height of the upper surface of the semiconductor device  300  relative to the lower surface of the semiconductor device  300 . The housing  440  is configured to be in direct contact with the wiring board  110 . Therefore, heat dissipated to the resist portion  113  can also be dissipated to the housing  440 , and it is possible to provide the electronic device  40  having a higher heat dissipation performance with a further improved heat dissipation amount to the housing  440 . 
     (Modifications) 
     In each of the above embodiments, an electronic device including only one semiconductor device has been described as an example, but the present disclosure is not limited thereto. The number of semiconductor devices included in the electronic device may be two as shown in  FIG. 6  or three or more. Further, although an example in which the semiconductor device including only one semiconductor element is described, the present disclosure is not limited thereto. The number of semiconductor elements included in one semiconductor device integrated by the resin mold may be two as shown in  FIG. 7  or three or more. 
     In the electronic device  50  shown in  FIG. 6 , two semiconductor devices  100  having a similar structure are arranged on the wiring board  510  side by side in the x direction. The wiring board  510  has two wiring portions  512  on which the two semiconductor devices  100  are arranged respectively and the resist portion  513  is disposed around the two wiring portions  512 . 
     The heat dissipating member  530  includes a flat surface portion  534 , side surface portions  533  and  535 , and an intermediate portion  537 . The flat surface portion  534  is provided over the upper surfaces of the two semiconductor devices  100 . The side surface portions  533 and  535  and the intermediate portion  537  extend downward from the flat surface portion  534  to be in contact with the surface of the wiring board  510 . The intermediate portion  537  is interposed between the two semiconductor devices  100 . 
     The housing  540  includes a flat surface portion  541  and side surface portions  542  and  543 . The side surface portions  542  and  543  face each other in the x-axis direction, and extend to sandwich the two semiconductor devices  100  and the heat dissipating member  530  from both sides of the two semiconductor devices  100  and the heat dissipating member  530  in the x-axis direction. 
     The upper surface  531  of the heat dissipating member  530  is in contact with the flat surface portion  541  of the housing  540 . The outer side surface  532  of the heat dissipating member  530  is in contact with the side surface portion  542  of the housing  540 . Similarly, the opposite outer side surface of the heat dissipating member  530  facing the side surface portion  543  of the housing  540  is in contact with the side surface portion  543 . The flat surface portion  541  of the housing  540  is in thermal contact with the upper surfaces of the two semiconductor devices  100  via the flat surface portion  534  of the heat dissipating member  530 . The side surface portions  533  and  535  extend below the lower end surfaces of the side surface portions  542  and  543 , respectively. The side surface portion  542  of the housing  540  is in thermal contact with the left side surface of the left semiconductor device  100  that is arranged on the left side in the figure (i.e., the negative direction side of the x-axis) and a part of the wiring board  110  via the side surface portion  533  of the heat dissipating member  530 . The side surface portion  543  of the housing  540  is in thermal contact with the right side surface of the right semiconductor device  100  that is arranged on the right side in the figure (i.e., the positive direction side of the x-axis) and a part of the wiring board  110  via the side surface portion  535  of the heat dissipating member  530 . The intermediate portion  537  is in contact with the right side surface of the left semiconductor device  100  and the left side surface of the right semiconductor device  100 . 
     The electronic device  60  shown in  FIG. 7  is different from the electronic device  50  shown in  FIG. 6  in that the electronic device  60  includes an integral semiconductor device  600  in which two sets of the semiconductor element  101 , the first conductive member  102 , the second conductive member  103 , and the connecting member  104  having the same configurations as those in the semiconductor device  100  are arranged side by side in the x direction and integrated by one resin mold  605 . 
     The heat dissipating member  630  includes a flat surface portion  634  and side surface portions  633  and  635 . The flat surface portion  534  is provided over the upper surfaces of the two semiconductor devices  600 . Since other configurations of the electronic device  60  are the same as those of the electronic device  50  shown in  FIG. 6 , the description will be omitted by replacing the reference numbers in the 500 series in  FIG. 6  with those in the 600 series. 
     Fifth Embodiment 
     In each of the above embodiments, an example where the housing is provided at a position facing the wiring board through the semiconductor device has been described. However, as shown in  FIG. 8  and the like, the housing may be disposed on the side of the semiconductor device on which the wiring board is arranged. For example, the housing may be provided at a position facing the semiconductor device through the wiring board. 
     The electronic device  70  according to the fifth embodiment includes the semiconductor device  100 , a wiring board  710 , a heat dissipating member  750 , and a housing  740 . Since the semiconductor device  100  is the same as that of the first embodiment, the description thereof will be omitted. The material of each component is the same as that of the first embodiment. 
     The wiring board  710  includes a base portion  711 , a wiring portion  712 , a resist portion  713 , and a penetrating portion  714 . The penetrating portion  714  penetrates the base portion  711  in the vertical direction. The wiring portion  712  is provided at a position on the upper surface of the penetrating portion  714  and is in contact with the penetrating portion  714 . As the material of the penetrating portion  714 , a material having a higher thermal conductivity than that of each of the base portion  711  and the resist portion  713  can be preferably used. In the present embodiment, as the penetrating portion  714 , the same or similar conductive material as that of the wiring portion  712  (for example, a metal material containing copper and aluminum or a composite metal material) is used. 
     The heat dissipating member  750  is in contact with the lower surface of the wiring board  710 . The heat dissipating member  750  is provided at a position in contact with at least the lower surface of the penetrating portion  714 . That is, the heat dissipating member  750  has a first surface facing the semiconductor device  100  and being in contact with the wiring board  710 . Similar to the first embodiment, the heat dissipating member  750  is made of an insulating gel-like high heat dissipating material mixed with a filler or the like for improving heat dissipation performance. When the thermal conductivity of the resin mold  105  is defined as km, the thermal conductivity of the heat dissipating member  750  is defined kg, and the thermal conductivity of the resist portion  713  is defined kr, kr≤1 W/(m·K), km&gt;1 W/(m·K) and kg≥3 W/(m·K) are satisfied in this embodiment. The thermal conductivity of each of the penetrating portion  714  and the wiring portion  712  is about 100 to 400 W/(m·K), which is remarkably high with respect to kr and kg. 
     The housing  740  is provided at a position in contact with the lower surface of the heat dissipating member  750 . The housing  740  has a flat plate shape substantially parallel to the lower surface of the semiconductor device  100  and the lower surface of the wiring board  710 . The housing  740  is in thermal contact with the lower surface of the semiconductor device  100  via the heat dissipating member  750 , the penetrating portion  714 , and the wiring portion  712 . The thermal conductivity of the housing  140  that is made of aluminum falls within a range of 100 to 300 W/(m·K), which is remarkably high with respect to kg and kr. 
     As described above, according to the electronic device  70  of the fifth embodiment, heat of the semiconductor device  100  is dissipated to the housing  740  through the wiring portion  712 , the penetrating portion  714 , and the heat dissipating member  750  that are arranged below the semiconductor device  100  (i.e., on the negative side of the semiconductor device  100  in the z-axis direction) in this order. In this heat dissipation path, heat is dissipated to the housing  740  via the wiring portion  712  and the penetrating portion  714  each of which has a thermal conductivity as high as that of the housing  740  and via the heat dissipating member  750  that has a thermal conductivity higher than that of the resist portion  713 . Thus, heat conductivity in this heat dissipation path is higher than that in a heat dissipation path from the semiconductor element  101  to the base portion  711  of the wiring board  710  through the resist portion  713 . Therefore, it is possible to provide the electronic device  70  having a high heat dissipation performance in which the heat dissipation amount to the housing  740  is improved. In the electronic device  70 , since the high heat dissipation resin material is used for the resin mold  105  as in the first embodiment, heat dissipation of the semiconductor device  100  via the resin mold  105  is also promoted. 
     (Modifications) 
     As in an electronic device  80  shown in  FIG. 9 , the penetrating portion  814  may be larger than the wiring portion  812 . By increasing the dimension of the penetrating portion  814  in the plane direction (i.e., the x-axis direction or y-axis direction), the heat transfer area of the heat dissipation path becomes large, so that heat can be dissipated more efficiently. Since the other configurations of the electronic device  80  are the same as those of the electronic device  70  shown in  FIG. 8 , the description will be omitted by replacing the reference numbers in the  700  series in  FIG. 8  with those in the  800  series. 
     In  FIGS. 8 and 9 , the description is made by exemplifying the semiconductor device including only one semiconductor element, but the present disclosure is not limited thereto. The number of semiconductor elements included in one semiconductor device integrated by the resin mold may be two as shown in  FIG. 10  or three or more. Further, the number of semiconductor devices included in the electronic device may be two or more. 
     The electronic device  90  shown in  FIG. 10  includes an integral semiconductor device  900  in which two sets of the semiconductor element  101 , the first conductive member  102 , the second conductive member  103 , and the connecting member  104  that have the same configurations as those of the semiconductor device  100  are arranged on the wiring board  910  side by side in the x direction and integrated by one resin mold  905 . The wiring board  910  has two wiring portions  912  on which the two semiconductor elements are respectively arranged, and two penetrating portions  914  in contact with the lower surfaces of the two wiring portions  912 , respectively. A resist portion  913  is disposed around the wiring portions  912 . Since the other configurations of the electronic device  90  are the same as those of the electronic device  70  shown in  FIG. 8 , the description thereof will be omitted by replacing the reference number in the 700 series in  FIG. 8  with the 900 series. 
     According to the embodiments described above, the following effects can be obtained. 
     The first electronic devices  10 ,  20 ,  30 ,  40 ,  50 ,  60  have a semiconductor device (for example, a semiconductor device  100 ), a wiring board (for example, a wiring board  110 ), and a heat dissipating member (for example, a heat dissipating member  130 ), and a housing (for example, a housing  140 ). The semiconductor device  100  includes a semiconductor element  101 , a conductive member (the first conductive member  102 ) electrically connected to the semiconductor element  101 , and a resin mold  105  sealing the semiconductor element  101 . The wiring board  110  includes a base portion  111 , a wiring portion  112  on which the semiconductor device  100  is mounted, and a resist portion  113  provided around the wiring portion  112 . The heat dissipating member  130  is in contact with at least one of surfaces of the semiconductor device  100 . The housing  140  is in thermal contact with the semiconductor device  100  via the heat dissipating member  130 . The thermal conductivity km of the resin mold  105  and the thermal conductivity kg of the heat dissipating member  130  are higher than the thermal conductivity kr of the resist portion  113  (i.e., km&gt;kr and kg&gt;kr). 
     According to the first electronic device, since each of the resin mold  105  and the heat dissipating member  130  has a higher thermal conductivity than the resist portion  113 , the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the housing  140  via the resin mold  105  and the heat dissipating member  130  is higher than the thermal conductivity in the heat dissipation path from the semiconductor element  101  to the wiring board  110  via the resist portion  113 . Therefore, it is possible to provide an electronic device having high heat dissipation performance with an improved heat dissipation amount to the housing  140 . 
     Like the first electronic device  20 , at least a part of the resin mold  205  may be in contact with the housing  240 . By dissipating heat directly from the resin mold  205  to the housing  240 , the heat dissipation from the semiconductor device  200  is promoted. 
     Like the first electronic device  10 ,  20 ,  30 ,  40 ,  50 ,  60 , the housing has a flat surface portion provided at a position facing the upper surface or the lower surface of the semiconductor device and a side surface portion provided at a position facing at least one of the side surfaces of the semiconductor device that are not parallel with the first surface. The side surface portion increases the heat dissipation path from the semiconductor device to the housing, and further promotes heat dissipation. Further, the side surface portion can restrict the position of the heat dissipating member from being offset. 
     Like the first electronic device  40 , the height of the side surface portion protruding from the flat surface portion of the housing is preferably higher than the height of the upper surface of the semiconductor device relative to the lower surface of the semiconductor device, and the lower end surface of the side surface portion is preferably in contact with the wiring board. Thereby, the heat dissipated to the resist portion can also be dissipated to the housing, and it is possible to provide an electronic device having a higher heat dissipation amount with a further improved heat dissipation amount to the housing. 
     As in the first electronic device  10 ,  20 ,  30 ,  50 ,  60 , the heat dissipating member may be provided between the side surface portion of the housing and the wiring board. Thereby, even in a region of the semiconductor device close to the wiring board, the thermal conductivity in the heat dissipation path to the housing can be improved, which can contribute to the improvement of the heat dissipation performance of the electronic device. 
     The conductive member may have an exposed part that is not covered with the resin mold as in the first electronic devices  30  and  40 . Since the material of the conductive member is a metal electrode material that has a higher thermal conductivity than the resin mold, heat of the semiconductor device can efficiently dissipate to the heat dissipating member via the conductive member, which improves heat dissipation amount to the housing. Further, it is preferable that the surface of the exposed part of the conductive member is insulated by insulating plating. Thereby, the thickness of the heat dissipating member disposed between the surface of the exposed part and the housing can be thinned, which can contribute to the improvement of the heat dissipating performance of the electronic device. 
     Further, like the second electronic devices  70 ,  80 ,  90 , in the electronic device including the semiconductor device  100 , the wiring board  710 ,  810 ,  910  including the base portion  711 ,  811 ,  911 , the penetrating portion  714 ,  814 ,  914  penetrating the base portion  711 ,  811 ,  911 , the wiring portion  712 ,  812 ,  912  that is disposed on the upper surface of the penetrating portion  714 ,  814 ,  914  and that the semiconductor device  100  is mounted on, the resist portion  713 ,  813 ,  913  disposed around the wiring portion  712 ,  812 ,  912 , the heat dissipating member  750 ,  850 ,  950  in contact with the wiring board  710 ,  810 ,  910  on a side of the heat dissipating member  750 ,  850 ,  950  facing the wiring portion  712 ,  812 ,  912  and the penetrating portion  714 ,  814 ,  914 , and a housing  740 ,  840 ,  940  in thermal contact with the semiconductor device  100  via the heat dissipating member  750 ,  850 ,  950 , heat dissipation performance of the electronic device can be improved by setting the thermal conductivity of each of the penetrating portion  714 ,  814 ,  914  and the heat dissipating member  750 ,  850 ,  950  to higher than that of the resist portion  713 ,  813 ,  913 . Specifically, the thermal conductivity in the heat dissipation path from the semiconductor element to the housing via the penetrating portion and the heat dissipating member is higher than the thermal conductivity in the heat dissipation path from the semiconductor element to the base portion via the resist portion. Therefore, it is possible to provide an electronic device having high heat dissipation performance with an improved heat dissipation amount to the housing. 
     While the present disclosure has been described in accordance with the embodiment, it is understood that the present disclosure is not limited to such embodiments or structures. The present disclosure encompasses various modifications and variations within the scope of equivalents. In addition, while the various combinations and configurations, which are preferred, other combinations and configurations, including more, less or only a single element, are also within the spirit and scope of the present disclosure.