Patent Publication Number: US-2022223501-A1

Title: Semiconductor module

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application is a continuation application of International Patent Application No. PCT/JP2020/037024 filed on Sep. 29, 2020, which designated the U.S. and claims the benefit of priority from Japanese Patent Applications No. 2019-181704 filed on Oct. 1, 2019, and No. 2020-160930 filed on Sep. 25, 2020. The entire disclosures of all of the above applications are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a semiconductor module including a plurality of semiconductor elements. 
     BACKGROUND 
     A conceivable technique teaches a semiconductor module in which six semiconductor elements are included in one resin mold. In this semiconductor module, the six semiconductor elements are power transistors and function as switching elements in the upper or lower arms of the U, V, W phases. 
     SUMMARY 
     According to an example, a semiconductor module may include: semiconductor elements having a gate electrode, a first electrode and a second electrode; a resin mold; and conductive members connected to at least one of the semiconductor elements and having a common wiring electrode exposed from the resin mold and connected to the first electrode or the second electrode and a non-common wiring electrode exposed from the resin mold and connected to an electrode of the semiconductor element different from the common wiring electrode. A width of a common wiring connected to the common wiring electrode is wider than the non-common wiring electrode. The common wiring is arranged from one side to an opposite side on a surface of the resin mold, on which the common wiring electrode is exposed, without being electrically connected to the non-common wiring electrode. 
    
    
     
       BRIEF DESCRIPTION OF THE 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 plan view showing a semiconductor module according to a second embodiment; 
         FIG. 2  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 1 ; 
         FIG. 3  is a cross sectional view taken along the line III-III of  FIG. 2 ; 
         FIG. 4  is a cross-sectional view taken along line IV-IV of  FIG. 2 ; 
         FIG. 5  is a diagram in which a plurality of semiconductor modules shown in  FIG. 1  are arranged side by side; 
         FIG. 6  is a cross-sectional view showing an element structure of a semiconductor element in the semiconductor module shown in  FIG. 1 ; 
         FIG. 7  is a schematic diagram of an electric power steering system to which the semiconductor module according to the first embodiment is applied; 
         FIG. 8  is a diagram showing a drive circuit of an electric power steering system to which the semiconductor module shown in  FIG. 1  is applied; 
         FIG. 9  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 10  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 11  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 12  is a plan view showing a semiconductor module according to a second embodiment; 
         FIG. 13  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 12 ; 
         FIG. 14  is a cross-sectional view taken along a line XIV-XIV of  FIG. 13 ; 
         FIG. 15  is a cross-sectional view taken along line XV-XV in  FIG. 13 ; 
         FIG. 16  is a diagram in which a plurality of semiconductor modules shown in  FIG. 12  are arranged side by side; 
         FIG. 17  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 18  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 19  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 20  is a plan view showing a semiconductor module according to a third embodiment; 
         FIG. 21  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 20 ; 
         FIG. 22  is a cross-sectional view taken along a line XXII-XXII of  FIG. 21 ; 
         FIG. 23  is a cross-sectional view taken along a line XXIII-XXIII line of  FIG. 21 , 
         FIG. 24  is a diagram in which a plurality of semiconductor modules shown in  FIG. 20  are arranged side by side; 
         FIG. 25  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 26  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 27  is a plan view showing a semiconductor module according to a modified example; 
         FIG. 28  is a plan view showing a semiconductor module according to a fourth embodiment; 
         FIG. 29  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 28 ; 
         FIG. 30  is a cross-sectional view taken along a line XXX-XXX of  FIG. 29 ; 
         FIG. 31  is a diagram in which a plurality of semiconductor modules shown in  FIG. 28  are arranged side by side; 
         FIG. 32  is a plan view showing a semiconductor module according to a fifth embodiment; 
         FIG. 33  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 32 ; 
         FIG. 34  is a diagram in which a plurality of semiconductor modules shown in  FIG. 32  are arranged side by side; 
         FIG. 35  is a diagram showing a drive circuit of an electric power steering system to which the semiconductor module shown in  FIG. 32  is applied; 
         FIG. 36  is a plan view showing a semiconductor module according to a sixth embodiment; 
         FIG. 37  is a plan view showing a state in which the resin mold is removed in the semiconductor module shown in  FIG. 36 ; 
         FIG. 38  is a cross-sectional view taken along a line XXXVIII-XXXVIII of  FIG. 37 ; 
         FIG. 39  is a cross-sectional view taken along line XXXIX-XXXIX of  FIG. 37 , 
         FIG. 40  is a diagram in which a plurality of semiconductor modules shown in  FIG. 36  are arranged side by side; 
         FIG. 41  is a diagram in which a set of semiconductor modules shown in  FIG. 40  and another set of semiconductor modules are installed so as to be line-symmetrical on a wiring board; 
         FIG. 42  is a diagram in which a set of semiconductor modules shown in  FIG. 40  and another set of semiconductor modules are installed so as to be point-symmetrical on a wiring board; 
         FIG. 43  is a diagram in which a plurality of semiconductor modules shown in  FIG. 36  are arranged side by side; 
         FIG. 44  is a diagram in which a plurality of semiconductor modules shown in  FIG. 36  are arranged side by side; 
         FIG. 45  is a diagram showing a mounting example of a semiconductor module according to a sixth embodiment; and 
         FIG. 46  is a diagram showing a mounting example of a semiconductor module according to a sixth embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     In a conceivable technique, in order to connect three semiconductor elements, a wiring is retrieved in a plane direction on the side of the semiconductor element, and the semiconductor element is connected on the side from which the wiring is retrieved. Therefore, in the mounting board on which the semiconductor modules are mounted, it is necessary to secure a space for the wiring for connecting the semiconductor modules to each other on the side of the semiconductor modules. Ensuring this space may limit the downsizing of the mounting board. 
     In view of the above, a technique is provided to be capable of reducing the wiring space on the side of the semiconductor module. 
     The present embodiments provide a semiconductor module including: a plurality of semiconductor elements, a resin mold for integrally encapsulating the plurality of semiconductor elements, and a plurality of conductive members electrically connected to at least one of the plurality of semiconductor elements. In this semiconductor module, the semiconductor element is an insulated gate type semiconductor element having a gate electrode, a first electrode, and a second electrode, in which a carrier moves from the side of the first electrode to the side of the second electrode in the semiconductor element through a channel formed by applying a voltage to the gate electrode. The plurality of conductive members include: a common wiring electrode that is exposed from the resin mold on the upper surface side or the lower surface side of the semiconductor module, and is electrically connected to at least one of the first electrode and the second electrode; and a non-common wiring that is exposed from the resin mold and is electrically connected an electrode of the semiconductor element different from the common wiring electrode. The wiring width of the common wiring connected to the common wiring electrode is wider than the wiring width of the non-common wiring electrode. When the common wiring is connected to the common wiring electrode, the plurality of semiconductor elements and the plurality of conductive members are disposed so as to arrange the common wiring from one opposite side to the other side on the surface of the resin mold, on which the common wiring electrode is exposed, without being electrically connected to the non-common wiring electrode. 
     According to the present embodiments, the semiconductor module includes a common wiring electrode exposed from the resin mold on the upper surface side or the lower surface side thereof, and a non-common wiring electrode connected to an electrode of a semiconductor element different from the common wiring electrode. Then, when the common wiring is connected to the common wiring electrode, the plurality of semiconductor elements and the plurality of conductive members are arranged so as to arrange the common wiring from one opposite side to the other side on the surface of the resin mold, on which the common wiring electrode is exposed, without being electrically connected to the non-common wiring electrode. Therefore, for example, by arranging a plurality of semiconductor modules according to the present disclosure adjacent to each other and by connecting the common wiring electrodes to each other by the common wiring, the plurality of semiconductor modules can be electrically connected to each other in the vertical direction of the semiconductor module. As a result, the wiring space on the side of the semiconductor module can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor module. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. 
     First Embodiment 
     As shown in  FIGS. 1 to 5 , a semiconductor module  10  according to a first embodiment includes a first semiconductor element  133  and a second semiconductor element  143 , a resin mold  120  for integrally sealing the first semiconductor element  133  and the second semiconductor element  143 , conductive members  101 - 104 , and conductive members  111 ,  112 ,  131 ,  141 . An x-axis direction and a y-axis direction shown in  FIGS. 1 to 5  are sides of the semiconductor module  10 , and an xy-plane direction is a plane direction of the semiconductor module  10 . The z-axis direction is a vertical direction orthogonal to the plane direction. 
     As shown in (a) of  FIG. 1 , the semiconductor module  10  has an outline shape in which four external terminals protrude in the negative direction of the y-axis from the resin mold  120  having a substantially rectangular shape when viewed from above, and two external terminals protrude in the positive direction of the y-axis. The four external terminals are a part of the conductive members  101  to  104  exposed from the resin mold  120 , and the two external terminals are a part of the conductive members  111  and  112  exposed from the resin mold  120 . 
     Further, as shown in (b) of  FIG. 1 , when the semiconductor module  10  is viewed from the lower surface, the entire lower surfaces of the conductive members  101  to  104  and the conductive member  111  are exposed from the resin mold  120 . The conductive member  112  includes a low step portion  112   a  that is not exposed from the resin mold  120  and a high step portion  112   b  that is exposed from the resin mold  120 . 
     The resin mold  120  is made of a high heat radiation resin material obtained by mixing a resin material such as an epoxy resin with a filler or the like for improving heat radiation. As the filler used for the high heat radiation resin material, for example, a composite oxide material having high thermal conductivity such as alumina is selected. The thermal conductivity of the resin mold  120  can be adjusted by adjusting the type and filling rate of the filler. 
       FIGS. 2 to 4  show each configuration in the resin mold  120  of the semiconductor module  10 . In  FIGS. 2 to 4 , the position where the resin mold  120  is provided is shown by a broken line. 
     As shown in  FIGS. 2 to 4 , in the resin mold  120 , the first semiconductor element  133  and the second semiconductor element  143  are integrally sealed in a state of being arranged side by side in the x direction in the same direction. The first semiconductor element  133  and the second semiconductor element  143  are semiconductor elements having the same structure, shape, size, and the like, and have a substantially rectangular shape when viewed from the top. The gate pad  136  of the first semiconductor element  133  and the gate pad  146  of the second semiconductor element  143  are provided at the same position in each semiconductor element. The first semiconductor element  133  and the second semiconductor element  143  are arranged substantially in parallel with the adjacent semiconductor element in the same direction as the adjacent semiconductor element. 
     The first semiconductor element  133  and the second semiconductor element  143  are vertical insulated gate semiconductor elements having an element structure as shown in  FIG. 6 . More specifically, the first semiconductor element  133  and the second semiconductor element  143  are power MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors: MOSFETs). 
     The first semiconductor element  133  and the second semiconductor element  143  each include a semiconductor substrate  60 , a source electrode  71 , and a drain electrode  72 . The source electrode  71  is formed in contact with an upper surface  60   u  of the semiconductor substrate  60 . The drain electrode  72  is formed in contact with a lower surface  60   b  of the semiconductor substrate  60 . The upper surface  60   u  corresponds to the first surface, and the lower surface  60   b  corresponds to the second surface. In the semiconductor substrate  60 , an n+ region  61 , an n− region  62 , and a p+ region  63  are stacked on each other in this order from the lower surface  60   b  side. An n+ region  64  is formed in a part of the p+ region  63  on the upper surface side. A trench  73  is provided to penetrate from the upper surface  60   u  of the semiconductor substrate  60  through the n+ region  64  and the p+ region  63 , and reaches an upper surface side of the n− region  62 . A gate insulation film  74  is formed on an inner wall surface of the trench  73 , and a gate electrode  75  is filled in the trench  73  in a state of being insulated from the semiconductor substrate  60  by the gate insulation film  74 . An upper surface of the gate electrode  75  is covered with an insulation film  76 , and the gate electrode  75  and the source electrode  71  are insulated from each other by the insulation film  76 . A material of the semiconductor substrate  60  is not particularly limited, silicon (Si), silicon carbide (SiC), gallium nitride (GaN), or the like may be exemplified. 
     When a positive voltage is applied to the gate electrode  75  of each of the first semiconductor element  133  and the second semiconductor element  143 , an n-type channel is provided in the p+ region  63  along the gate insulation film  74 , and n-type carriers move from the source electrode  71  to the drain electrode  72  in the semiconductor substrate  60 . As a result, a current flows from the drain electrode  72  to the source electrode  71 . In other words, in the first semiconductor element  133  and the second semiconductor element  143 , a gate voltage applied to the gate electrode  75  is controlled, thereby being capable of performing on/off control of switching elements of the first semiconductor element  133  and the second semiconductor element  143 . The source electrode  71  corresponds to a first electrode, and the source terminal electrically connected to the source electrode  71  among the external terminals corresponds to a first terminal. The drain electrode  72  corresponds to a second electrode, and a drain terminal electrically connected to the drain electrode  72  among the external terminals corresponds to a second terminal. 
     The first semiconductor element  133  and the second semiconductor element  143  are arranged so that the longitudinal direction is the y direction when viewed from above when the source electrode  71  faces upward (positive direction of the z-axis) and the drain electrode faces downward (negative direction of the z-axis), respectively. 
     As shown in  FIGS. 2 and 3 , on the first semiconductor element  133  side, the conductive member  131 , the bonding member  132 , the first semiconductor element  133 , the bonding member  134 , and the conductive member  111  are arranged in this order from above. The conductive member  131  includes a beam-shaped portion  131   a , a pad portion  131   b , and a columnar portion  131   c . The pad portion  131   b  is located on the upper surface side of the first semiconductor element  133 , and is a substantially rectangular portion having a size of the upper surface similar to that of the first semiconductor element  133 . The beam-shaped portion  131   a  extends in the negative direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  131   b , and extends above the conductive member  102 . The columnar portion  131   c  extends downward from the beam-shaped portion  131   a , and its lower end surface is bonded to the upper surface of the conductive member  102  via the bonding member  135 . The conductive member  101  is electrically connected to the gate pad  136  by the gate wiring  137 . 
     As shown in  FIGS. 2 and 4 , on the second semiconductor element  143  side, the conductive member  141 , the bonding member  142 , the second semiconductor element  143 , the bonding member  144 , and the conductive member  112  are arranged in this order from above. The conductive member  141  includes a beam-shaped portion  141   a , a pad portion  141   b , and a columnar portion  141   c . The pad portion  141   b  is located on the upper surface side of the second semiconductor element  143 , and is a substantially rectangular portion having a size of the upper surface similar to that of the second semiconductor element  143 . The beam-shaped portion  141   a  extends in the negative direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  141   b , and extends above the conductive member  104 . The columnar portion  141   c  extends downward from the beam-shaped portion  141   a , and its lower end surface is bonded to the upper surface of the conductive member  104  via the bonding member  145 . The conductive member  103  is electrically connected to the gate pad  146  by the gate wiring  147 . The gate wirings  137  and  147  are so-called clips, alternatively, wire bonding, wire ribbons, and the like may be used in addition to the clips. 
     The conductive members  101  and  102  correspond to the gate terminal and the source terminal of the first semiconductor element  133 , and the conductive member  111  corresponds to the drain pad of the first semiconductor element  133 . The conductive members  103  and  104  correspond to the gate terminal and the source terminal of the second semiconductor element  143 , and the conductive member  112  corresponds to the drain pad of the second semiconductor element  143 . 
     As shown in  FIGS. 1 to 4 , the high step portion  112   b  of the conductive member  112  is exposed from the resin mold  120 , while the low step portion  112   a  is not exposed from the resin mold  120 . Therefore, when the semiconductor module  10  is viewed from the bottom, the portion exposed from the resin mold  120  of the drain pad (i.e., the conductive member  112 ) of the second semiconductor element  143  has an area smaller than the part exposed from the resin mold  120  of the drain pad (i.e., the conductive member  111 ) of the first semiconductor element  133 . Between the exposed high step portion  112   b  and the conductive members  103  and  104 , there is a region where nothing is exposed on the surface of the resin mold  120  because the low step portion  112   a  is covered with the resin mold  120 . This area corresponds to the common wiring area. 
     As shown in  FIGS. 1 to 5 , in the resin mold  120  having a substantially rectangular shape when the semiconductor module  10  is viewed from the bottom, a region where the low step portion  112   a  and a portion of the conductive portion  111  adjacent to the step portion  112   a  are included is located between the long sides opposing in the x direction. Therefore, as shown in  FIG. 5 , when the three semiconductor modules  10  are arranged side by side in the same direction along the x direction so as to be substantially orthogonal to the long sides opposing the x direction, the region A 1  extending straight along the x direction in a strip shape is secured. In  FIG. 5 , reference numbers of  10   a ,  10   b , and  10   c  are assigned in order from the positive direction side of the x-axis at the arrangement positions. The region A 1   c  shown in  FIG. 5  indicates a common wiring region A 1   c  of the semiconductor module  10   c . The common wiring region A 1   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  120  on which the conductive member  111  is exposed. The conductive member  111  exists in the common wiring region A 1   c , and no conductive member (such as the conductive member  112  or the like) other than the conductive member  111  exists therein. Although not shown, the semiconductor modules  10   a  and  10   b  also have the same common wiring area as the common wiring area A 1   c . The width in the direction (i.e., they direction) orthogonal to the wiring direction (i.e., the x direction) of the common wiring area A 1   c  is such that the width in which the wiring can be installed is secured, and for example, the width is wider than the installation interval of the conductive members  101  to  104  (i.e., the interval in the x direction). 
     The region A 1  is included in an area including the common wiring region of the semiconductor modules  10   a  to  10   c  and an area connecting between them. This region A 1  extends over three semiconductor modules  10   a ,  10   b , and  10   c , and in the region A 1 , only the conductive member  111  is exposed from the resin mold  120 . Therefore, by installing the common wiring connected to the three conductive members  111  respectively included in the three semiconductor modules  10   a ,  10   b , and  10   c  in the region A 1 , the three conductive members  111  are electrically connected to each other. The wiring width of the common wiring (i.e., the width in the y direction orthogonal to the x direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  101  to  104 , and the width of the region A 1  in the y direction is secured sufficiently to arrange the common wiring. 
     Of the above conductive members, the conductive members  101  to  104 ,  111 ,  112  are exposed from the resin mold  120  on the upper surface side or the lower surface side of the semiconductor module  10 . Of the conductive members  101  to  104 ,  111 ,  112 , the conductive member  111  corresponds to the common wiring electrode, and the conductive members  101  to  104 ,  112  correspond to the non-common wiring electrode. The common wiring electrode is exposed from the resin mold  120  on the upper surface side (i.e., the positive direction side of the z-axis) or the lower surface side (i.e., the negative direction side of the z-axis) of the semiconductor module  10 , and is an electrode electrically connected to at least one of the first electrode (i.e., the source electrode  71 ) and the second electrode (i.e., the drain electrode  72 ). The common wiring electrode is connected to the common wiring when the semiconductor module  10  is connected to another semiconductor module by the common wiring. 
     As described with reference to  FIG. 5 , by arranging the common wiring across the region A 1 , the common wiring is disposed from one side facing the x-axis direction to the other side on the lower surface of the resin mold  120  without not being electrically connected to the non-common wiring electrode (i.e., the conductive members  101  to  104 ,  112 ). 
     That is, in the semiconductor module  10 , when the common wiring is connected to the common wiring electrode (i.e., the conductive member  111 ), each configuration (i.e., a plurality of semiconductor elements, a plurality of conductive members, and the like) constituting the semiconductor module  10  is arranged so that the common wiring is not electrically connected to the non-common wiring electrode (i.e., the conductive members  101  to  104 ,  112 ), and the common wiring is arranged from one side to the other opposite side on the surface of the resin mold on which the common wiring electrode is exposed. Therefore, the plurality of semiconductor modules  10  can be electrically connected to each other on the lower surface side of the semiconductor module  10 . As a result, the wiring space on the side of the semiconductor module  10  can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor module. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. Furthermore, since the resin mold  120  is made of a high heat radiation resin material, heat radiation of the semiconductor module  10  can be promoted via the resin mold  120 . 
     The semiconductor module  10  can be applied to a drive circuit of an electric power steering system (EPS)  80  of a vehicle as shown in  FIG. 6 . The EPS  80  includes a steering wheel  90 , a steering shaft  91 , a pinion gear  92 , a rack shaft  93 , and an EPS device  81 . The steering shaft  91  is connected to the steering wheel  90 . The pinion gear  92  is provided at a tip of the steering shaft  91 . The pinion gear  92  is engaged with the rack shaft  93 . Wheels  95  are rotatably connected to both ends of the rack shaft  93  through tie rods or the like. When a driver rotates the steering wheel  90 , the steering shaft  91  rotates. The pinion gear  92  converts rotary motion of the steering shaft  91  to linear motion of the rack shaft  93 , and the wheels  95  are steered to have a steering angle according to displacement of the rack shaft  93 . 
     The EPS device  81  includes a torque sensor  94 , a speed reducer  96 , a rotary electric machine  82 , and an energization circuit unit  83 . The torque sensor  94  is provided on the steering shaft  91 , and detects a steering torque Trq which is an output torque of the steering shaft  91 . The rotary electric machine  82  generates an assisting torque corresponding to the detected steering torque Trq and a steering direction of the steering wheel  90 . The energization circuit unit  83  performs a drive control of the rotary electric machine  82 . The speed reducer  96  transmits the assisting torque to the steering shaft  91  while reducing the rotation of a rotation shaft of a rotor of the rotary electric machine  82 . 
     As shown in  FIG. 8 , a permanent magnet field type or a winding field type can be used as the rotary electric machine  82 . A stator of the rotary electric machine  82  includes a first winding group M 1  and a second winding group M 2 . The first winding group M 1  includes a star-connected first U-phase winding U 1 , a first V-phase winding V 1 , and a first W-phase winding W 1 , and the second winding group M 2  includes a star-connected phase second U-phase winding U 2 , a second V-phase winding V 2 , and a second W-phase winding W 2 . Respective first ends of the first U-phase winding U 1 , the first V-phase winding V 1 , and the first W-phase winding W 1  are connected to each other at a neutral point. The first U-phase winding U 1 , the first V-phase winding V 1 , and the first W-phase winding W 1  are shifted by 120° at an electric angle θe. Respective first ends of the second U-phase winding U 2 , the second V-phase winding V 2 , and second W-phase winding W 2  are connected to each other at a neutral point. The second U, V, and W-phase coils U 2 , V 2 , and W 2  are shifted from one another by 120 degrees in terms of the electrical angle θe. 
     The energization circuit unit  83  includes a first inverter INV 1  and a second inverter INV 2  as power converters, and a first relay RL 1  and a second relay RL 2  as power supply relays. 
     In the first inverter INV 1 , a second end of the first U-phase winding U 1  is connected to a connection point between an upper arm switch SU 1   p  and a lower arm switch SU 1   n  of a first U phase. A second end of the first V-phase winding V 1  is connected to a connection point between an upper arm switch SV 1   p  and a lower arm switch SV 1   n  of a first V phase. A second end of the first W-phase winding W 1  is connected to a connection point between an upper arm switch SW 1   p  and a lower arm switch SW 1   n  of a first W phase. In the second inverter INV 2 , a second end of the second U-phase winding U 1  is connected to a connection point between an upper arm switch SU 2   p  and a lower arm switch SU 2   n  of a second U phase. A second end of the second V-phase winding V 2  is connected to a connection point between an upper arm switch SV 2   p  and a lower arm switch SV 2   n  of a second V phase. A second end of the second W-phase winding W 2  is connected to a connection point between an upper arm switch SW 2   p  and a lower arm switch SW 2   n  of a second W phase. 
     The high-potential side terminals of the upper arm switch SU 1   p  of the first U phase, the upper arm switch SV 1   p  of the first V phase, the upper arm switch SW 1   p  of the first W-phase are connected to a positive electrode terminal of a battery  97 , which is a DC power supply, through the first relay RL 1 . The low-potential side terminals of the lower arm switch SU 1   n  of the first U phase, the lower arm switch SV 1   n  of the first V phase, the lower arm switch SW 1   n  of the first W-phase are connected to the ground through resistors RU 1 , RV 1 , and RW 1 , respectively. The high-potential side terminals of the upper arm switch SU 2   p  of the second U phase, the upper arm switch SV 2   p  of the second V phase, and the upper arm switch SW 2   p  of the second W-phase are connected to a positive electrode terminal of the battery  97  through the second relay RL 2 . The low-potential side terminals of the lower arm switch SU 2   n  of the second U phase, the lower arm switch SV 2   n  of the second V phase, and the lower arm switch SW 2   n  of the second W-phase are connected to the ground through resistors RU 2 , RV 2 , and RW 2 , respectively. The negative electrode terminal of the battery  97  is connected to ground. 
     As the switches SU 1   p  to SW 2   n , a MOSFET exemplified by the first semiconductor element  133  and the second semiconductor element  143  can be used. Each of two switches SU 1   p  and SU 1   n , SV 1   p  and SV 1   n , SW 1   p  and SW 1   n , SU 2   p  and SU 2   n , SV 2   p  and SV 2   n , SW 2   p  and SW 2   n  connected in series in each arm are connected in series by connecting the source electrode of the former MOSFET and the drain electrode of the latter MOSFET. 
     The semiconductor module  10  can be used as semiconductor modules SU 1 , SV 1 , SW 1 , SU 2 , SV 2 , and SW 2  in which two switches SU 1   p  and SU 1   n , SV 1   p  and SV 1   n , SW 1   p  and SW 1   n , SU 2   p  and SU 2   n , SV 2   p  and SV 2   n , and SW 2   p  and SW 2   n  connected in series in each arm are integrated together. A semiconductor module  10  can be applied to the first inverter INV 1  and the second inverter INV 2  to form an inverter circuit. 
     As the switches SP 1  and SC 1  configuring the power supply relay RL 1  and the switches SP 2  and SC 2  configuring the power supply relay RL 2 , a MOSFET exemplified by the first semiconductor element  133  and the second semiconductor element  143  can be used. The switches SP 1  and SP 2  are power supply relay switches, and the switches SC 1  and SC 2  are reverse connection protective relays. The two switches SP 1  and SC 1 , and SP 2  and SC 2  connected in series in each arm are connected in series by connecting the source electrodes of the MOSFETs to each other. 
     When the MOSFETs such as the first semiconductor element  133  and the second semiconductor element  143  are used as the switches SU 1   p  to SW 2   n , SP 1 , SC 1 , SP 2 , and SC 2 , the body diodes of the MOSFETs can be used as freewheeling diodes. For that reason, in  FIG. 7 , the freewheeling diodes connected in anti-parallel to the respective switches SU 1   p  to SW 2   n , SP 1 , SC 1 , SP 2 , and SC 2  are not shown, but the freewheeling diodes may be connected to the respective switches SU 1   p  to SW 2   n , SP 1 , SC 1 , SP 2 , and SC 2 . 
     The energization circuit unit  83  detects currents flowing through the resistors RU 1 , RV 1 , and RW 1  and outputs the detected currents as a first U-phase current Iur 1 , a first V-phase current Ivr 1 , and a first W-phase current Iwr 1 . Further, the energization circuit unit  83  detects the currents flowing through the resistors RU 2 , RV 2 , and RW 2  and outputs the detected currents as a second U-phase current Iur 2 , a second V-phase current Ivr 2 , and a second W-phase current Iwr 2 . 
     The energization circuit unit  83  includes an ECU mainly configured by a microcomputer, and the ECU operates the switches of the first inverter INV 1  and the second inverter INV 2  to control a torque of the rotary electric machine  82  to reach a torque command value Tr*. The torque command value Tr* is set based on, for example, a steering torque Trq detected by the torque sensor  94 . The energization circuit unit  83  calculates an electric angle θe of the rotary electric machine  82  by the ECU based on an output signal of an angular sensor. As the angle sensor, for example, an angular sensor including a magnet which is a magnetic generation portion provided on a rotor side of the rotary electric machine  82  and a magnetic detection element provided close to the magnet can be exemplified. The functions provided by the ECU may be provided, for example, by software stored in a tangible memory device and a computer causing the software to be executed, hardware, or a combination of the software, the computer, and the hardware. 
     As described above, the semiconductor module  10  can be applied to the EPS  80 , and can be applied to the energization circuit unit  83  corresponding to a drive circuit of the EPS  80  as the semiconductor modules SU 1  to SW 2  including two switches connected in series with each other. 
     Specifically, the semiconductor module  10  can be applied to each of inverter circuits shown as the first inverter INV 1  and the second inverter INV 2 , and the first semiconductor element  133  and the second semiconductor element  143  are applied to the inverter circuit as switching elements connected in series with each other. 
     Modifications Examples 
     As shown in (a) of  FIG. 1 , as the semiconductor module  10 , the conductive members  131  and  141  have been described by way of example when they are not exposed from the resin mold  120 , but the present embodiment may not be limited to this. Like the semiconductor module  11  shown in  FIG. 9 , the semiconductor module  11  may be provided with conductive members  151  and  161  protruding from the resin mold  120  on the upper surface side thereof. Other configurations in the semiconductor module  11  are the same as those of the semiconductor module  10 , and therefore a description of those configurations will be omitted. 
     Further, as shown in  FIG. 1 , as the semiconductor module  10 , the conductive members  111  and  112  extend beyond the positive direction of the y-axis of the resin mold  120 , but the present embodiment may not be limited to this. Like the semiconductor module  12  shown in  FIG. 10 , the resin mold  120  may include conductive members  113  and  114  that do not exceed the positive direction of the y-axis. Other configurations in the semiconductor module  12  are the same as those of the semiconductor module  10 , and therefore a description of those configurations will be omitted. 
     Further, as in the semiconductor module  13  shown in  FIG. 11 , the conductive members  115  and  116  may be provided such that the portion thereof extending beyond the positive direction of the y-axis of the resin mold  120  is branched into two parts. Other configurations in the semiconductor module  13  are the same as those of the semiconductor module  10 , and therefore a description of those configurations will be omitted. 
     Second Embodiment 
     In the first embodiment, a state in which a plurality of semiconductor elements (i.e., the first semiconductor element  133 , and the second semiconductor element  143 ) are arranged substantially in parallel with adjacent semiconductor elements in the same direction as adjacent semiconductor elements is described. Alternatively, as in the second embodiment, the semiconductor elements may be arranged substantially point-symmetrically with the adjacent semiconductor elements in the opposite direction to the adjacent semiconductor elements. 
     In the semiconductor module  20  according to the second embodiment, as shown in  FIGS. 12 to 15 , in the resin mold  220 , the second semiconductor element  243  is integrally sealed in a state where it is arranged side by side in the x-axis direction in a direction rotated by 180 degrees around the center of a vertical direction (i.e., the z direction) with respect to the first semiconductor element  233 . That is, the first semiconductor element  233  and the second semiconductor element  243  are arranged substantially point-symmetrically with the adjacent semiconductor element in the opposite direction to the adjacent semiconductor element. As in the first embodiment, the first semiconductor element  233  and the second semiconductor element  243  are semiconductor elements having the same structure, shape, size, and the like. The material, shape, size, and the like of each configuration included in the semiconductor module  20  are the same as those of each configuration included in the semiconductor module. 
     As shown in  FIGS. 13 and 14 , each configuration on the first semiconductor element  233  side, that is, the conductive member  231  and the bonding member  232 , the first semiconductor element  233 , the bonding member  234 , and the conductive member  211  are arranged in the same manner as each configuration on the first semiconductor element  133  side in the first embodiment. Thus, the description will be omitted by replacing the reference number in the  100   s  with the  200   s.    
     As shown in  FIGS. 13 and 15 , on the second semiconductor element  243  side, the conductive member  241 , the bonding member  242 , the second semiconductor element  243 , the bonding member  244 , and the conductive member  212  are arranged in this order from above, similar to the first embodiment. The conductive member  241  includes a beam-shaped portion  241   a , a pad portion  241   b , and a columnar portion  241   c . The beam-shaped portion  241   a  extends in the positive direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  241   b , and extends above the conductive member  203 . The columnar portion  241   c  extends downward from the beam-shaped portion  241   a , and its lower end surface is bonded to the upper surface of the conductive member  203  via the bonding member  245 . The conductive member  204  is electrically connected to the gate pad  246  by the gate wiring  247 . 
     The conductive members  201  and  202  correspond to the gate terminal and the source terminal of the first semiconductor element  243 , and the conductive member  212  corresponds to the drain pad of the first semiconductor element  233 . The conductive members  203  and  204  correspond to the source terminal and the gate terminal of the second semiconductor element  243 , and the conductive member  212  corresponds to the drain pad of the second semiconductor element  243 . 
     As shown in  FIGS. 12 to 15 , the high step portion  212   b  of the conductive member  212  is exposed from the resin mold  220 , while the low step portion  212   a  is not exposed from the resin mold  220 . Therefore, when the semiconductor module  20  is viewed from the bottom, the portion exposed from the resin mold  220  of the drain pad (i.e., the conductive member  212 ) of the second semiconductor element  243  has an area smaller than the part exposed from the resin mold  220  of the drain pad (i.e., the conductive member  211 ) of the first semiconductor element  233 . Between the exposed high step portion  212   b  and the conductive members  203  and  204 , there is a region where nothing is exposed on the surface of the resin mold  220  because the low step portion  212   a  is covered with the resin mold  220 . This area corresponds to the common wiring area. 
     As shown in  FIGS. 12 to 16 , in the resin mold  220  having a substantially rectangular shape when the semiconductor module  20  is viewed from the bottom, the low step portion  212   a  and a portion of the conductive portion  211  adjacent to the low step portion  212   a  are included between the long sides opposing in the x direction. Therefore, as shown in  FIG. 16 , when the three semiconductor modules  20  are arranged side by side in the same direction along the x direction so as to be substantially orthogonal to the long sides opposing the x direction, the region A 2  extending straight along the x direction in a strip shape is secured. In  FIG. 16 , reference numbers of  20   a ,  20   b , and  20   c  are assigned in order from the positive direction side of the x-axis at the arrangement positions. The region A 2   c  shown in  FIG. 16  indicates a common wiring region A 2   c  of the semiconductor module  20   c . The common wiring region A 2   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  220  on which the conductive member  211  is exposed. The conductive member  211  exists in the common wiring region A 2   c , and no conductive member other than the conductive member  211  exists. Although not shown, the semiconductor modules  20   a  and  20   b  also have the same common wiring area as the common wiring area A 2   c.    
     The region A 2  is included in an area including the common wiring region of the semiconductor modules  20   a  to  20   c  and an area connecting between them. This region A 2  extends over three semiconductor modules  20   a ,  20   b , and  20   c , and in the region A 2 , only the conductive member  211  is exposed from the resin mold  220 . Therefore, by installing the common wiring connected to the three conductive members  211  respectively included in the three semiconductor modules  20   a ,  20   b , and  20   c  in the region A 2 , the three conductive members  211  are electrically connected to each other. 
     Of the above conductive members, the conductive members  201  to  204 ,  211 ,  212  are exposed from the resin mold  220  on the upper surface side or the lower surface side of the semiconductor module  20 . Of the conductive members  201  to  204 ,  211 ,  212 , the conductive member  211  corresponds to the common wiring electrode, and the conductive members  201  to  204 ,  212  correspond to the non-common wiring electrode. 
     As shown in  FIG. 16 , by arranging the common wiring across the region A 2 , the common wiring is disposed from one side facing the x-axis direction to the other side on the lower surface of the resin mold  220  without not being electrically connected to the non-common wiring electrode (i.e., the conductive members  201  to  204 ,  212 ). The wiring width of the common wiring (i.e., the width in the y direction orthogonal to the x direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  201  to  204 , and the width of the region A 2  in the y direction is secured sufficiently to arrange the common wiring. 
     That is, similarly to the semiconductor module  10 , in the semiconductor module  20 , when the common wiring is connected to the common wiring electrode, each configuration (i.e., a plurality of semiconductor elements, a plurality of conductive members, and the like) constituting the semiconductor module  20  is arranged so that the common wiring electrode is exposed without being electrically connected to the non-common wiring electrode, and the common wiring can be arranged from one side to the other side opposite to the one side on the surface of the resin mold on which the common wiring electrode is exposed. Therefore, the plurality of semiconductor modules  20  can be electrically connected to each other on the lower surface side of the semiconductor module  20 . As a result, the wiring space on the side of the semiconductor module  20  can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor element. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. Furthermore, since the resin mold  220  is made of a high heat radiation resin material, heat radiation of the semiconductor module  20  can be promoted via the resin mold  220 . 
     As described above, similar to the semiconductor module  10 , the semiconductor module  20  can be applied to the EPS  80 , and can be applied to the energization circuit unit  83  corresponding to a drive circuit of the EPS  80  as the semiconductor modules SU 1  to SW 2  including two switches connected in series with each other. 
     Modifications Examples 
     Similar to the first embodiment, the semiconductor modules  21  to  23  shown in  FIGS. 17 to 19  can be applied as modification examples in the second embodiment. For example, as in the semiconductor module  21  shown in  FIG. 17 , on the upper surface side thereof, the conductive members  251 , 261  protruding from the resin mold  220  may be provided instead of the conductive members  231 , 241 . 
     Further, as in the semiconductor module  22  shown in  FIG. 18 , instead of the conductive members  211  and  212 , the conductive members  213  and  214  that do not exceed the positive direction of the y-axis of the resin mold  220  may be provided. 
     Further, as in the semiconductor module  23  shown in  FIG. 19 , the conductive members  215  and  216  may be provided such that the portion thereof extending beyond the positive direction of the y-axis of the resin mold  220  is branched into two parts. Other configurations in the semiconductor modules  21  to  23  are the same as those of the semiconductor module  20 , and therefore a description of those configurations will be omitted. 
     Third Embodiment 
     In the first embodiment and the second embodiment, the plurality of semiconductor elements are arranged side by side in the direction (i.e., the x direction) perpendicular to the direction (i.e., the y direction) in which the conductive member protrudes as the external terminal. Alternatively, the external terminal may be arranged side by side in the protruding direction. 
     In the semiconductor module  30  according to the second embodiment, as shown in  FIGS. 20 to 23 , in the resin mold  320 , the second semiconductor element  343  is integrally sealed in a state where it is arranged side by side in the y-axis direction in a direction rotated by 180 degrees around the center of a vertical direction (i.e., the z direction) with respect to the first semiconductor element  333 . That is, the first semiconductor element  333  and the second semiconductor element  343  are arranged substantially point-symmetrically with the adjacent semiconductor element in the opposite direction to the adjacent semiconductor element. As in the first embodiment, the first semiconductor element  333  and the second semiconductor element  343  are semiconductor elements having the same structure, shape, size, and the like. The first semiconductor element  333  and the second semiconductor element  343  are arranged so that the longitudinal direction when viewed from above is parallel to the x-axis. 
     As shown in  FIGS. 21 to 23 , on the first semiconductor element  333  side, the conductive member  331 , the bonding member  332 , the second semiconductor element  333 , the bonding member  334 , and the conductive member  312  are arranged in this order from above, similar to the first embodiment. The conductive member  331  includes a beam-shaped portion  331   a , a pad portion  331   b , and a columnar portion  331   c . The beam-shaped portion  331   a  extends in the positive direction of the x-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  331   b , and extends above the conductive member  312 . The columnar portion  331   c  extends downward from the beam-shaped portion  331   a , and its lower end surface is bonded to the upper surface of the conductive member  312  via a bonding member (not shown). The conductive member  304  is electrically connected to the gate pad  346  by the gate wiring  347 . 
     On the second semiconductor element  343  side, the conductive member  341 , the bonding member  342 , the second semiconductor element  343 , the bonding member  344 , and the conductive member  312  are arranged in this order from above. The conductive member  341  includes a beam-shaped portion  341   a , a pad portion  341   b , and a columnar portion  341   c . The beam-shaped portion  341   a  extends in the negative direction of the x-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  341   b , and extends above the conductive member  313 . The columnar portion  341   c  extends downward from the beam-shaped portion  341   a , and its lower end surface is bonded to the upper surface of the conductive member  313  via a bonding member (not shown). The conductive member  301  is electrically connected to the gate pad  346  by the gate wiring  347 . 
     The conductive member  311  has a substantially L-shape, and includes a terminal portion  311   a  and an element mounting portion  311   b . The first semiconductor element  333  is arranged in the element mounting portion  311   b . The terminal portion  311   a  extends from the element mounting portion  311   b  in the positive direction of the y-axis and extends beyond the end portion of the resin mold  320  on the positive direction side of the y-axis. 
     The conductive member  312  includes a first terminal portion  312   a , a low step portion  312   b , an element mounting portion  312   c , and a second terminal portion  312   d . The second semiconductor element  343  is arranged in the element mounting portion  312   c . The low step portion  312   b  and the first terminal portion  312   a  are elongated strip-shaped and substantially rectangular portions extending from the end of the element mounting portion  312   c  on the positive direction side of the x-axis toward the positive side of the y-axis, and the low step portion  312   b  is closer to the element mounting portion  312   c . The second terminal portion  312   d  is a strip-shaped and substantially rectangular portion extending from the end portion of the element mounting portion  312   c  on the positive direction side of the x-axis to the negative direction side of the y-axis. 
     The conductive member  312  is in contact with the drain electrode of the second semiconductor element  343  via the bonding member  344  in the element mounting portion  312   c  and is electrically connected to the drain electrode. Further, the conductive member  312  is electrically connected to the source electrode of the first semiconductor element  333  at the low step portion  312   b  via the conductive member  331 , the bonding member  332 , and the like. That is, the conductive member  312  corresponds to the connection conductive member for connecting the first electrode (i.e., the source electrode) of the first semiconductor element  333  and the second electrode (i.e., the drain electrode) of the second semiconductor element  343  arranged adjacent to the first semiconductor element  333 . 
     The conductive member  313  has an elongated strip shape and a substantially rectangular shape, and extends from the end on the positive side of the y-axis of the element mounting portion  312   c  of the conductive member  312  to beyond the end on the negative side of the y-axis of the resin mold  320 . 
     The conductive members  304 ,  312  correspond to the gate terminal and the source terminal of the first semiconductor element  333 , and the conductive member  311  corresponds to the drain pad of the first semiconductor element  333 . The conductive members  301 ,  313  correspond to the gate terminal and the source terminal of the second semiconductor element  343 , and the conductive member  312  corresponds to the drain pad of the second semiconductor element  343 . 
     As shown in  FIGS. 20 to 24 , the first terminal portion  312   a , the element mounting portion  312   c , and the second terminal portion  312   d  of the conductive member  312  correspond to the high step portion and are exposed from the resin mold  320 . The low step portion  312   b  is not exposed from the resin mold  320 . Therefore, when the semiconductor module  30  is viewed from the bottom, it seems that the first terminal portion  312   a  and the element mounting portion  312   c  are not connected, while the second terminal portion  312   d  and the element mounting portion  312   c  are connected. The low step portion  312   b  is adjacent to a part of the element mounting portion  311   b  of the conductive member  311  in the x direction. Therefore, on the lower surface of the semiconductor module  30 , the low step portion  312   b  is covered with the resin mold  320  between the exposed first terminal portion  312   a  and the element mounting portion  312   c , so that an area not exposed on the surface of the resin mold  320  is disposed. This area corresponds to the common wiring area. 
     As shown in  FIGS. 20 to 24 , in the resin mold  320  having a substantially rectangular shape when the semiconductor module  30  is viewed from the bottom, the low step portion  312   a  and a portion of the element mounting portion  311   b  of the conductive portion  311  adjacent to the low step portion  312   a  are included between the long sides opposing in the x direction. Therefore, as shown in  FIG. 24 , when the three semiconductor modules  30  are arranged side by side in the same direction along the x direction so as to be substantially orthogonal to the long sides opposing the x direction, the region A 3  extending straight along the x direction in a strip shape is secured. In  FIG. 24 , reference numbers of  30   a ,  30   b , and  30   c  are assigned in order from the positive direction side of the x-axis at the arrangement positions. The region A 3   c  shown in  FIG. 24  indicates a common wiring region A 3   c  of the semiconductor module  30   c . The common wiring region A 3   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  320  on which the conductive member  311  is exposed. The conductive member  311  exists in the common wiring region A 3   c , and no conductive member other than the conductive member  311  exists. Although not shown, the semiconductor modules  30   a  and  30   b  also have the same common wiring area as the common wiring area A 3   c.    
     The region A 3  is included in an area including the common wiring region of the semiconductor modules  30   a  to  30   c  and an area connecting between them. This region A 3  extends over three semiconductor modules  30   a ,  30   b , and  30   c , and in the region A 3 , only the conductive member  311  (more specifically, the element mounting portion  311   b ) is exposed from the resin mold  320 . Therefore, by installing the common wiring connected to the three conductive members  311  respectively included in the three semiconductor modules  30   a ,  30   b , and  30   c  in the region A 3 , the three conductive members  311  are electrically connected to each other. 
     Of the above conductive members, the conductive members  301  to  304 ,  311  to  313  are exposed from the resin mold  320  on the upper surface side or the lower surface side of the semiconductor module  30 . Of the conductive members  301  to  304 ,  311  to  313 , the conductive member  311  corresponds to the common wiring electrode, and the conductive members  301  to  304 ,  312 ,  313  correspond to the non-common wiring electrode. 
     As shown in  FIG. 24 , by arranging the common wiring across the region A 3 , the common wiring is disposed from one side facing the x-axis direction to the other side on the lower surface of the resin mold  320  without not being electrically connected to the non-common wiring electrode (i.e., the conductive members  301  to  304 ,  312 ,  313 ). The wiring width of the common wiring (i.e., the width in the y direction orthogonal to the x direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  301  to  304 , and the width of the region A 3  in the y direction is secured sufficiently to arrange the common wiring. 
     That is, similarly to the semiconductor modules  10 ,  20 , in the semiconductor module  30 , when the common wiring is connected to the common wiring electrode, each configuration (i.e., a plurality of semiconductor elements, a plurality of conductive members, and the like) constituting the semiconductor module  30  is arranged so that the common wiring electrode is exposed without being electrically connected to the non-common wiring electrode, and the common wiring can be arranged from one side to the other side opposite to the one side on the surface of the resin mold on which the common wiring electrode is exposed. Therefore, the plurality of semiconductor modules  30  can be electrically connected to each other on the lower surface side of the semiconductor module  30 . As a result, the wiring space on the side of the semiconductor module  30  can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor element. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. Furthermore, since the resin mold  320  is made of a high heat radiation resin material, heat radiation of the semiconductor module  30  can be promoted via the resin mold  320 . 
     As described above, similar to the semiconductor module  10 , the semiconductor module  30  can be applied to the EPS  80 , and can be applied to the energization circuit unit  83  corresponding to a drive circuit of the EPS  80  as the semiconductor modules SU 1  to SW 2  including two switches connected in series with each other. 
     Modifications Examples 
     Also in the third embodiment, the semiconductor modules  31  to  33  shown in  FIGS. 25 to 27  can be applied as modification examples. For example, as in the semiconductor module  31  shown in  FIG. 25 , on the upper surface side thereof, the conductive members  351 , 361  protruding from the resin mold  320  may be provided instead of the conductive members  331 ,  341 . 
     Further, as in the semiconductor module  32  shown in  FIG. 26 , the conductive member  305  that integrates the conductive members  301  and  302  may be provided instead of the conductive members  301  and  302 . Similarly, instead of the conductive members  303  and  304 , a conductive member  306  that integrates them may be provided. The conductive member  305  is a gate terminal of the first semiconductor element  333 , and the conductive member  306  is a gate terminal of the second semiconductor element  343 . Further, as in the semiconductor module  33  shown in  FIG. 27 , one of the conductive members  301  and  302  may not be provided. Further, one of the conductive members  303  and  304  may not be provided. The semiconductor module  33  is not provided with the conductive members  301  and  303 . Other configurations in the semiconductor modules  31  to  33  are the same as those of the semiconductor module  30 , and therefore a description of those configurations will be omitted. 
     Fourth Embodiment 
     In the first embodiment, the conductive member  112  corresponding to the non-common wiring electrode has a high step portion  112   b  higher toward the lower surface side exposed from the resin mold  120  and a low step portion  112   a  lower than the high step portion  112   b . This allows the common wiring to be arranged. Alternatively, it may not be limited to this feature. 
     In the semiconductor module  40  according to the fourth embodiment, as shown in  FIGS. 28 to 30 , the first semiconductor element  433  and the second semiconductor element  443  are integrally sealed in a state where they are arranged side by side in the x direction in the resin mold  420  in the same direction. The first semiconductor element  433  and the second semiconductor element  443  are arranged substantially in parallel with the adjacent semiconductor element in the same direction as the adjacent semiconductor element. As in the first embodiment, the first semiconductor element  433  and the second semiconductor element  443  are semiconductor elements having the same structure, shape, size, and the like. The first semiconductor element  433  and the second semiconductor element  443  are arranged so that the longitudinal direction when viewed from above is parallel to the x-axis. 
     As shown in  FIGS. 29 to 31 , on the first semiconductor element  433  side, the conductive member  431 , the bonding member  432 , the second semiconductor element  433 , the bonding member  434 , and the conductive member  411  are arranged in this order from above, similar to the first embodiment. The conductive member  431  includes a beam-shaped portion  431   a , a pad portion  431   b , and a columnar portion  431   c . The beam-shaped portion  431   a  extends in the positive direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  431   b , and extends above the conductive member  412 . The columnar portion  431   c  extends downward from the beam-shaped portion  431   a , and its lower end surface is bonded to the upper surface of the conductive member  401  via a bonding member (not shown). The conductive member  402  is electrically connected to the gate pad  446  by the gate wiring  447 . 
     On the second semiconductor element  443  side, the conductive member  441 , the bonding member  442 , the second semiconductor element  443 , the bonding member  444 , and the conductive member  412  are arranged in this order from above. The conductive member  441  includes a beam-shaped portion  441   a , a pad portion  441   b , and a columnar portion  441   c . The beam-shaped portion  441   a  extends in the positive direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  441   b , and extends above the conductive member  403 . The columnar portion  441   c  extends downward from the beam-shaped portion  441   a , and its lower end surface is bonded to the upper surface of the conductive member  403  via a bonding member (not shown). The conductive member  404  is electrically connected to the gate pad  446  by the gate wiring  447 . Each configuration on the second semiconductor element  443  side is a state in which each configuration on the first semiconductor element  433  side is moved in the positive direction of the x-axis, and each configuration has the same shape, size, and positional relationship. 
     The conductive members  401  and  402  correspond to the source terminal and the gate terminal of the first semiconductor element  433 , and the conductive member  411  corresponds to the drain pad of the first semiconductor element  433 . The conductive members  403  and  404  correspond to the source terminal and the gate terminal of the second semiconductor element  443 , and the conductive member  412  corresponds to the drain pad of the second semiconductor element  443 . 
     The conductive member  411  has a substantially T-shape, and includes a first terminal portion  411   a , an element mounting portion  411   b , an intermediate portion  411   c , and a second terminal portion  411   d . The element mounting portion  411   b  is provided substantially in the center of the conductive member  411  in the y direction, and the intermediate portion  411   c  is located on the negative direction side of the x-axis with respect to the element mounting portion  411   b . The first terminal portion  411   a  is provided on the positive direction side of the y-axis and extends beyond the end portion of the resin mold  420  on the positive direction side of the y-axis. The second terminal portion  411   d  is provided on the negative direction side of the y-axis and extends beyond the end portion of the resin mold  420  on the negative direction side of the y-axis. The intermediate portion  411   c  is a portion between the first terminal portion  411   a  and the second terminal portion  411   d . The first semiconductor element  433  is arranged in the element mounting portion  411   b . Since the shape of the conductive member  412  is the same as that of the conductive member  411 , the description thereof will be omitted by replacing  411  in the reference number with  412 . 
     As shown in  FIGS. 28 to 31 , in the resin mold  420  having a substantially rectangular shape when the semiconductor module  40  is viewed from the bottom, there is a region in which only the conductive member  411  is included between the short sides facing in the y direction. This area corresponds to the common wiring area. Therefore, as shown in  FIG. 31 , when the three semiconductor modules  40  are arranged side by side in the same direction along the y direction so as to be substantially orthogonal to the short sides opposing the y direction, the region A 4  extending straight along the y direction in a strip shape is secured. In  FIG. 31 , reference numbers of  40   a ,  40   b , and  40   c  are assigned in order from the positive direction side of the y-axis at the arrangement positions. The region A 4   c  shown in  FIG. 31  indicates a common wiring region A 4   c  of the semiconductor module  40   c . The common wiring region A 4   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  420  on which the conductive member  411  is exposed. The conductive member  411  exists in the common wiring region A 4   c , and no conductive member other than the conductive member  411  exists. Although not shown, the semiconductor modules  40   a  and  40   b  also have the same common wiring area as the common wiring area A 4   c.    
     The region A 4  is included in an area including the common wiring region of the semiconductor modules  40   a  to  40   c  and an area connecting between them. This region A 4  extends over three semiconductor modules  40   a ,  40   b , and  40   c , and in the region A 4 , only the conductive member  411  is exposed from the resin mold  420 . Therefore, by installing the common wiring connected to the three conductive members  411  respectively included in the three semiconductor modules  40   a ,  40   b , and  40   c  in the region A 4 , the three conductive members  411  are electrically connected to each other. As is clear from  FIG. 31 , in the conductive member  412  as well, in the resin mold  420  which has a substantially rectangular shape when the semiconductor module  40  is viewed from the bottom, a region that includes only the conductive member  412  is disposed between the short sides facing in the y direction. Therefore, the common wiring connected to the three conductive members  412  included in the three semiconductor modules  40   a ,  40   b , and  40   c  can be arranged. 
     Of the above conductive members, the conductive members  401  to  404 ,  411 ,  412  are exposed from the resin mold  420  on the upper surface side or the lower surface side of the semiconductor module  40 . Of the conductive members  401  to  404 ,  411 ,  412 , the conductive members  411 , and  412  correspond to the common wiring electrode, and the conductive members  401  to  404  correspond to the non-common wiring electrode. 
     As described with reference to  FIG. 31 , by arranging the common wiring across the region A 4 , the common wiring is disposed from one side facing the x-axis direction to the other side on the lower surface of the resin mold  420  without not being electrically connected to the non-common wiring electrode (i.e., the conductive members  401  to  404 , and the like). The wiring width of the common wiring (i.e., the width in the x direction orthogonal to the y direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  401  to  404 , and the width of the region A 4  in the x direction is secured sufficiently to arrange the common wiring. 
     That is, similarly to the semiconductor modules  10 ,  20 ,  30 , in the semiconductor module  40 , when the common wiring is connected to the common wiring electrode, each configuration (i.e., a plurality of semiconductor elements, a plurality of conductive members, and the like) constituting the semiconductor module  40  is arranged so that the common wiring electrode is exposed without being electrically connected to the non-common wiring electrode, and the common wiring can be arranged from one side to the other side opposite to the one side on the surface of the resin mold on which the common wiring electrode is exposed. Therefore, the plurality of semiconductor modules  40  can be electrically connected to each other on the lower surface side of the semiconductor module  40 . As a result, the wiring space on the side of the semiconductor module  40  can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor element. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. Furthermore, since the resin mold  420  is made of a high heat radiation resin material, heat radiation of the semiconductor module  40  can be promoted via the resin mold  420 . 
     Further, in the semiconductor module  40 , the common wiring electrode extends to a position where it protrudes from both of the opposite pair of sides of the surface of the resin mold. With this configuration, the common wiring can be realized without providing a step in the thickness direction of the conductive member. Further, in the semiconductor module  40 , since it is not necessary to separately form the conductive member on the first semiconductor element side and the conductive member on the second semiconductor element side, the configuration is simple and it can contribute to the reduction of manufacturing cost and the like. 
     Fifth Embodiment 
     In each of the above embodiments, a semiconductor module including two semiconductor elements has been described as an example, but the semiconductor module may include three or more semiconductor elements. 
     In the semiconductor module  50  according to the fifth embodiment, as shown in  FIGS. 32 to 33 , the first semiconductor element  533  and the second semiconductor element  543  and the this semiconductor element  553  are integrally sealed in a state where they are arranged side by side in the x direction in the resin mold  520  in the same direction. 
     The semiconductor module  50  has a configuration in which a third semiconductor element  553  and a conductive member mounted or connected to the third semiconductor element  553  are further added to the semiconductor module  40 . Since each configuration on the first semiconductor element  533  side and each configuration on the second semiconductor element  543  side are the same as each configuration on the first semiconductor element  433  side and each configuration on the second semiconductor element  443  side in the semiconductor module  40 , the description will be omitted by replacing the reference number in the  400  series with the  500  series. 
     Each configuration on the third semiconductor element  553  side is a state in which each configuration on the first semiconductor element  533  side or each configuration on the second semiconductor element  543  side is moved in the positive direction of the x-axis, and each configuration has the same shape, size, and positional relationship. 
     On the third semiconductor element  553  side, the conductive member  581 , the bonding member, the third semiconductor element  553 , the bonding member, and the conductive member  571  are arranged in this order from above. The conductive member  581  includes a beam-shaped portion  581   a , a pad portion  581   b , and a columnar portion (not shown). The beam-shaped portion  581   a  extends in the positive direction of the y-axis along the long side of the upper surface of the substantially rectangular shape of the pad portion  581   b , and extends above the conductive member  505 . The columnar portion extends downward from the beam-shaped portion  581   a , and its lower end surface is bonded to the upper surface of the conductive member  505  via a bonding member (not shown). The conductive member  506  is electrically connected to the gate pad by the gate wiring. 
     The conductive members  501  and  502  correspond to the source terminal and the gate terminal of the first semiconductor element  533 , and the conductive member  511  corresponds to the drain pad of the first semiconductor element  533 . The conductive members  503  and  504  correspond to the source terminal and the gate terminal of the second semiconductor element  543 , and the conductive member  512  corresponds to the drain pad of the second semiconductor element  543 . The conductive members  505  and  506  correspond to the source terminal and the gate terminal of the third semiconductor element  553 , and the conductive member  571  corresponds to the drain pad of the third semiconductor element  553 . 
     As shown in  FIGS. 32 to 34 , in the resin mold  520  having a substantially rectangular shape when the semiconductor module  50  is viewed from the bottom, there is a region in which only the conductive member  511  is included between the short sides facing in the y direction. This area corresponds to the common wiring area. Therefore, as shown in  FIG. 34 , when the three semiconductor modules  50  are arranged side by side in the same direction along the y direction so as to be substantially orthogonal to the short sides opposing the y direction, the region A 5  extending straight along the y direction in a strip shape is secured. In  FIG. 34 , reference numbers of  50   a ,  50   b , and  50   c  are assigned in order from the positive direction side of the y-axis at the arrangement positions. The region A 5   c  shown in  FIG. 34  indicates a common wiring region A 5   c  of the semiconductor module  50   c . The common wiring region A 5   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  520  on which the conductive member  511  is exposed. The conductive member  511  exists in the common wiring region A 5   c , and no conductive member other than the conductive member  511  exists. Although not shown, the semiconductor modules  50   a  and  50   b  also have the same common wiring area as the common wiring area A 5   c.    
     The region A 5  is included in an area including the common wiring region of the semiconductor modules  50   a  to  50   c  and an area connecting between them. This region A 5  extends over three semiconductor modules  50   a ,  50   b , and  50   c , and in the region A 5 , only the conductive member  511  is exposed from the resin mold  520 . Therefore, by installing the common wiring connected to the three conductive members  511  respectively included in the three semiconductor modules  50   a ,  50   b , and  50   c  in the region A 5 , the three conductive members  511  are electrically connected to each other. 
     As is clear from  FIG. 34 , in the conductive members  512 ,  571  as well, in the resin mold  520  which has a substantially rectangular shape when the semiconductor module  50  is viewed from the bottom, a region that includes only the conductive member  512  is disposed between the short sides facing in the y direction. Therefore, it is possible to install the three conductive members  512  included in the three semiconductor modules  50   a ,  50   b , and  50   c , or the common wiring connected to the three conductive members  571 , respectively. The wiring width of the common wiring (i.e., the width in the x direction orthogonal to the y direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  501  to  506 , and the width of the region A 5  in the x direction is secured sufficiently to arrange the common wiring. 
     The semiconductor module according to this embodiment can be used in a drive circuit as shown in  FIG. 35 . The drive circuit shown in  FIG. 35  corresponds to the drive circuit shown in  FIG. 8  with adding the motor relay switches TU 1 , TV 1 , TW 1 , TU 2 , TV 2 , and TW 2  therein. The connection point between the upper arm switch SU 1   p  and the lower arm switch SU 1   n  of the first U phase and the second end of the first U phase winding U 1  are connected via the motor relay switch TU 1 . The connection point between the upper arm switch SV 1   p  and the lower arm switch SV 1   n  of the first V phase and the second end of the first V phase winding V 1  are connected via the motor relay switch TV 1 . The connection point between the upper arm switch SW 1   p  and the lower arm switch SW 1   n  of the first W phase and the second end of the first W phase winding U 1  are connected via the motor relay switch TW 1 . The connection point between the upper arm switch SU 2   p  and the lower arm switch SU 2   n  of the second U phase and the second end of the second U phase winding U 2  are connected via the motor relay switch TU 2 . The connection point between the upper arm switch SV 2   p  and the lower arm switch SV 2   n  of the second V phase and the second end of the second V phase winding V 2  are connected via the motor relay switch TV 2 . The connection point between the upper arm switch SW 2   p  and the lower arm switch SW 2   n  of the second W phase and the second end of the second W phase winding U 2  are connected via the motor relay switch TW 2 . 
     The semiconductor module  50  can be applied to the EPS  80 , and can be applied to the energization circuit unit  83  corresponding to a drive circuit of the EPS  80  as the semiconductor modules SU 1  to SW 2  including two switches connected in series with each other and the motor relay switch. Further, it may be configured as a semiconductor module in which SU 1 , SV 1  and SW 1  shown in  FIG. 8  are integrated. 
     The semiconductor module having the low step portion  112   a  and the high step portion  112   b  in the conductive member  112  corresponding to the non-common wiring electrode described in the first embodiment also includes three or more semiconductor elements, and the common wiring can be enabled. For example, a semiconductor module  10  can provide the semiconductor module including three semiconductor elements capable of the common wiring by adding each configuration on the second semiconductor element  143  side to the semiconductor module  10  on the positive direction side of the x-axis. 
     Sixth Embodiment 
     In each of the above embodiments, a semiconductor module in which a conductive member that functions as a gate terminal or the like protrudes laterally from the resin mold when viewed from above has been described as an example, and it may not be limited to this feature. The conductive member may not protrude to the side of the semiconductor module. 
     As shown in  FIGS. 36 to 39 , a semiconductor module  160  according to a first embodiment includes a first semiconductor element  633  and a second semiconductor element  643 , a resin mold  620  for integrally sealing the first semiconductor element  633  and the second semiconductor element  643 , conductive members  601 - 605 , and conductive members  611 ,  612 ,  631 ,  641 . An x-axis direction and a y-axis direction shown in  FIGS. 36 to 39  are sides of the semiconductor module  160 , and an xy-plane direction is a plane direction of the semiconductor module  160 . The z-axis direction is a vertical direction orthogonal to the plane direction. 
     (a) of  FIG. 36  is a top view of the semiconductor module  160 , and (b) of  FIG. 36  is a bottom view of the semiconductor module  160 .  FIG. 37  is a top view of each configuration in the resin mold  120  of the semiconductor module  160 , and  FIGS. 38 and 39  are cross-sectional views of each configuration in the resin mold  120  of the semiconductor module  160 . In  FIGS. 37 to 39 , the position where the resin mold  120  is provided is shown by a broken line. 
     As shown in  FIGS. 36 to 39 , in the resin mold  620 , the second semiconductor element  643  is integrally sealed while being arranged side by side in the x direction along a direction rotated by 180 degrees with respect to the first semiconductor element  633  around the vertical direction (i.e., the z direction). The first semiconductor element  633  and the second semiconductor element  643  are semiconductor elements having the same structure, shape, size, and the like, and have a substantially rectangular shape when viewed from the top. 
     On the first semiconductor element  633  side, the conductive member  631 , the bonding member  632 , the first semiconductor element  633 , the bonding member  634 , and the conductive member  611  are arranged in this order from above. On the second semiconductor element  643  side, the conductive member  641 , the bonding member  642 , the second semiconductor element  643 , the bonding member  644 , and the conductive member  612  are arranged in this order from above. 
     When the semiconductor module  160  is viewed from the lower surface, the entire lower surfaces of the conductive members  601  to  605  and the conductive member  111  are exposed from the resin mold  620 . 
     In the semiconductor module  160 , as shown in (b) of  FIG. 36 , the conductive members  601  to  605  that function as the gate terminal, the source terminal, or the drain terminal are exposed on the lower surface side (i.e., the negative direction of the z-axis) of the resin mold  620 , and do not protrude in the lateral y direction. 
     The conductive member  612  includes a low step portion  612   a  that is not exposed from the resin mold  620  and a high step portion  612   b  that is exposed from the resin mold  620 . The high step portion  612   b  is a substantially rectangular portion arranged below and around the second semiconductor element  643 . The low step portion  612   a  is an elongated rectangular portion extending from the end of the high step portion  612   b  to the side where the first semiconductor element  633  is arranged (i.e, the negative direction side of the x-axis). 
     The conductive member  631  has a substantially rectangular shape when viewed from above, and includes an extending portion  631   a  and a pad portion  631   b . The pad portion  631   b  is located on the upper surface side of the first semiconductor element  633 , and is bonded to the upper surface side (i.e., the source electrode side) of the first semiconductor element  633  via the bonding member  632 . The extending portion  631   a  extends from the pad portion  631   b  in the negative direction of the y-axis and extends above the low step portion  612   a  of the conductive member  612 . The lower end surface of the extending portion  631   a  is bonded to the upper surface of the low step portion  612   a  via the bonding member  634 . The drain electrode side, which is the lower surface side of the second semiconductor element  643 , and the source electrode side, which is the upper surface side of the first semiconductor element  633 , are electrically connected via the conductive member  631  and the conductive member  612 . 
     Like the conductive member  631 , the conductive member  641  has a substantially rectangular shape when viewed from above, and includes an extending portion  641   a  and a pad portion  641   b . The pad portion  641   b  is located on the upper surface side of the second semiconductor element  643 , and is bonded to the upper surface side (i.e., the source electrode side) of the second semiconductor element  643  via the bonding member  642 . The extending portion  641   a  extends from the pad portion  641   b  in the positive direction of the y-axis and extends above the conductive member  605 . The lower end surface of the extending portion  641   a  is bonded to the upper surface of the conductive member  605  via the bonding member  644 . 
     The conductive member  601  is connected to the conductive member  611  that functions as a drain pad of the first semiconductor element  633 , and functions as a drain terminal of the first semiconductor element  633 . The conductive member  602  is electrically connected to the gate electrode of the first semiconductor element  633  and functions as a gate terminal of the first semiconductor element  633 . The conductive member  603  is electrically connected to the gate electrode of the second semiconductor element  643  and functions as a gate terminal of the second semiconductor element  643 . 
     The conductive member  604  is connected to the conductive member  612  that functions as a drain pad of the second semiconductor element  643 . Since the conductive member  612  is electrically connected to the drain electrode of the second semiconductor element  643  and the source electrode of the first semiconductor element  633 , the conductive member  604  functions as a source terminal of the first semiconductor element  633  and a drain terminal of the second semiconductor element  643 . The conductive member  605  is electrically connected to the conductive member  641  that functions as a source pad of the second semiconductor element  643 , and functions as a drain terminal of the second semiconductor element  643 . 
     As shown in  FIGS. 36 to 39 , a low step portion  612   a  is provided at a position facing the conductive members  601 ,  602  functioning as a gate terminal and a drain terminal in the y direction via the first semiconductor element  633 . Then, on the lower surface side of the semiconductor module  160 , the low step portion  612   a  is covered with the resin mold  620 , so that there is a region where nothing is exposed on the surface of the resin mold  620 . This area corresponds to the common wiring area. 
     Therefore, as shown in  FIG. 40 , when the three semiconductor modules  160  are arranged side by side in the same direction along the y direction so as to be substantially orthogonal to the long sides opposing the y direction, for example, the region A 6  extending straight along the y direction in a strip shape is secured. The region A 6  is a substantially rectangular region extending in the y direction on the negative side of the x-axis with respect to the conductive member  602 . In  FIG. 40 , reference numbers of  160   a ,  160   b , and  160   c  are assigned in order from the positive direction side of the y-axis at the arrangement positions. The area A 6   a  indicates a common wiring area A 6   a  of the semiconductor module  160   a . The common wiring region A 6   c  is a strip-shaped region that extends substantially straight from one opposite side to the other on the surface of the resin mold  620  on which the conductive member  611  is exposed. In the common wiring region A 6   a , the conductive member  611  exists, and no conductive member other than the conductive member  601  having the same potential as the conductive member  611  exists. Although not shown, the semiconductor modules  160   b  and  160   c  also have the same common wiring area as the common wiring area A 6   c.    
     The region A 6  is included in an area including the common wiring region of the semiconductor modules  160   a  to  160   c  and an area connecting between them. This region A 6  extends over three semiconductor modules  160   a ,  160   b ,  160   c , and in the region A 6 , only the conductive member  611  and the conductive member  601  having the same potential as the conductive member  611  are exposed from the resin mold  620 . Therefore, by installing the common wiring connected to the three conductive members  611  respectively included in the three semiconductor modules  160   a ,  160   b , and  160   c  in the region A 6 , the three conductive members  611  are electrically connected to each other. The wiring width of the common wiring (i.e., the width in the x direction orthogonal to the y direction, which is the wiring direction) is wider than the wiring width (i.e., the width in the x direction) of the conductive members  601  to  603 , and the width of the region A 6  in the x direction is secured sufficiently to arrange the common wiring. The conductive member  611  corresponds to a common wiring electrode. 
     That is, in the semiconductor module  160 , when the common wiring is connected to the common wiring electrode (i.e., the conductive member  611 ), each configuration (i.e., a plurality of semiconductor elements, a plurality of conductive members, and the like) constituting the semiconductor module  160  is arranged so that the common wiring is not electrically connected to the non-common wiring electrode (i.e., the conductive members  601  to  605 ,  612 ), and the common wiring is arranged from one side to the other opposite side on the surface of the resin mold on which the common wiring electrode is exposed. Therefore, similarly to the first embodiment and the like, the plurality of semiconductor modules  160  can be electrically connected to each other on the lower surface side of the semiconductor module  160 . As a result, the wiring space on the side of the semiconductor module  160  can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor element. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. 
       FIG. 41  shows an electronic device  180  in which module sets  160   s  and  161   s  including three semiconductor modules are arranged on a wiring board  650 , respectively. The module set  160   s  has three semiconductor modules  160  arranged in the state shown in  FIG. 40 . In the module set  161   s , three semiconductor modules are arranged side by side in the y direction as in  FIG. 40  so that the positional relationship of each configuration of the semiconductor module  160  is line-symmetrical with respect to the y-axis shown in  FIGS. 36 to 39 . As for the module set  161   s , the region A 61  as a common wiring region expanding over the three semiconductor modules can be secured as in the region A 6 . The module set  160   s  and the module set  161   s  are provided so as to be substantially line-symmetric with respect to the center line L 1  extending along the y direction through the center of the wiring board  650 . The module sets  1605  and  161   s  are arranged so that the regions A 6  and A 61  are located closer to the center line L 1 . The electronic device  180  shown in  FIG. 41  may be applied to, for example, the inverter circuit shown in  FIG. 8 . More specifically, for example, the module set  1605  may be used as the first inverter INV 1  and the module set  161   s  may be used as the second inverter INV 2 . 
       FIG. 42  shows an electronic device  181  in which module sets  1605  and  1625  including three semiconductor modules are arranged on a wiring board  650 , respectively. The module sets  1605 ,  1625  have three semiconductor modules  160  arranged in the state shown in  FIG. 40 . The module set  1605  and the module set  1625  are provided so as to be substantially point-symmetrical with respect to the center O of the wiring board  650 . The module set  1625  is arranged at a position where the module set  1605  is rotated by 180 degrees around the center O. The module sets  1605  and  1625  are arranged so that the regions A 6  and A 62  are located closer to the center O. The electronic device  181  shown in  FIG. 42  may be applied to, for example, the inverter circuit shown in  FIG. 8 . More specifically, for example, the module set  1605  may be used as the first inverter INV 1  and the module set  161   s  may be used as the second inverter INV 2 . 
     When the semiconductor modules  160   a  to  160   c  are arranged as shown in  FIG. 40 , a common wiring region can be secured in a manner different from that of the region A 6 . For example, as shown in  FIG. 43 , a substantially rectangular region A 7  extending in the y direction on the positive direction side of the x-axis with respect to the conductive member  602  can be secured as a common wiring region. Further, both the area A 6  shown in  FIG. 40  and the area A 3  shown in  FIG. 43  may be used as a common wiring area. Further, the area A 8  as shown in  FIG. 44  may be secured as a common wiring area. The region A 8  is a region including a portion A 8 R at the same position as the region A 6 , a portion A 8 L at the same position as the region A 7 , and a portion A 8 R and a portion A 8 C. The portion A 8 C may be provided at a position not in contact with the conductive member  602 . When the semiconductor modules  160   a  to  160   c  are connected using the common wiring similar to the shape of the region A 8 , the cross-sectional area in the current flow direction in the common wiring can be increased, and the wiring resistance can be reduced. 
       FIG. 45  shows an electronic device  182  as an example of a state in which the semiconductor module  160  is mounted on the wiring board  650 . The electronic device  182  includes a semiconductor module  160 , a wiring board  650 , and a housing  670 . The semiconductor module  160  is arranged such that the module  160  is mounted on the wiring board  650  and is disposed in a housing  670  with an opening on an upper side (i.e., the negative direction side of the z-axis) shown in  FIG. 45 , and an upper surface side of the module  160  (i.e., the positive direction side of the z-axis) shown in  FIG. 36  faces the lower side. The upper surface of the housing  670  is covered with a wiring board  650 . 
     The wiring board  650  includes a base material portion  651 , a wiring portion  652 , and a resist portion  653  provided around the wiring portion  652 . A wiring portion  652  and a resist portion  653  are provided on the surface of the base material portion  651  on the positive direction side of the z-axis, and a wiring pattern is formed. A bonding member  662  is provided in contact with the upper surface of the conductive wiring portion  652 , and the semiconductor module  160  is bonded to the wiring board  650  via the bonding member  662 . More specifically, the conductive members  611  and  612  are bonded to and fixed to the wiring portion  652  via the bonding member  662 . The bonding member  662  is made of, for example, a solder material. The resist portion  653  is made of a resist resin material such as an epoxy resin. The housing  670  is made of a metal such as aluminum. 
     As shown in  FIG. 45 , the non-mounting surface of the semiconductor module  160  facing the wiring board  650  is a surface in the positive direction of the z-axis and is covered with a resin mold  620  made of a high heat radiation resin material, and the conductive member is not exposed thereon. The surface of the resin mold  620  facing the wiring board  650  is in contact with the housing  670 . The depth of the housing  670  (i.e., the height in the z direction of the inner wall surface) substantially coincides with the total thickness (i.e., the length in the z direction) of the semiconductor module  160  and the bonding members  661  and  662 . 
     Since the resin mold  620  is made of a high heat radiation resin material, heat generated by the semiconductor module  160  and the wiring board  650  can be discharged via the resin mold  620 . Further, since the resin mold  620  is in contact with the housing  670 , heat generated in the semiconductor module  160  and the wiring board  650  can be efficiently radiated to the housing  670  via the resin mold  620 . 
       FIG. 46  shows an electronic device  183  as another example of a state in which the semiconductor module  160  is mounted on the wiring board  650 . Similar to  FIG. 46 , the semiconductor module  160  is arranged such that the module  160  is mounted on the wiring board  650  and is disposed in a housing  671  with an opening on an upper side (i.e., the negative direction side of the z-axis) shown in  FIG. 46 , and an upper surface side of the module  160  (i.e., the positive direction side of the z-axis) shown in  FIG. 36  faces the lower side. The upper surface of the housing  671  is covered with a wiring board  650 . 
     In  FIG. 46 , in the housing  671 , the semiconductor module  160  is housed in the housing  671  in a state where the heat radiation member  680  covers the sides (in the x direction and the y direction) and the lower side (in the positive direction of the z axis). The housing  671  is configured in the same manner as the housing  670  except that the depth is different. The depth of the housing  671  is substantially the same as the total value obtained by adding the thickness dg of the heat radiation member  680  to the thickness of the semiconductor module  160  and the bonding members  661  and  662 . it is possible to secure the heat radiation path to the housing  671  by adjusting the thickness dg of the heat radiation member  680  that fills the space between the housing  671  and the semiconductor module  160  even if the difference between the thickness of the semiconductor module  160  and the bonding members  661  and  662  and the depth of the housing  671  varies due to design tolerances. 
     The heat radiation member  680  is made of a gel-like material such as a resin material or a silicon material, or a high heat radiating material obtained by mixing an adhesive with a filler for improving heat radiating property. As the filler used for the high heat radiation material, for example, a composite oxide material having high thermal conductivity such as alumina is selected. By adjusting the type of filler and the filling rate, the thermal conductivity of the heat radiation member  680  can be adjusted. 
     It may be preferable that the heat radiation member  680  is adjusted to have a thermal conductivity equal to or higher than that of the resin mold  620 . For example, when the thermal conductivity of the resin mold  620  is defined as km and the thermal conductivity of the heat radiation member  680  is defined as kg, it may be preferable that km≥2 W/(m·K), and km≥3 W/(m·K). Further, it is sufficient that kg km, and it may be preferable that kg&gt;km. Conventionally, in a semiconductor module in which an electrode is exposed on the non-mounting surface, it may not be necessary to increase the thermal conductivity of the resin mold since the heat is radiated from the exposed electrode. Thus, the thermal conductivity may be as low as less than 1 W/(m·K). On the other hand, by using the resin mold  620  having a high thermal conductivity as in the present embodiment, even if the electrodes of the semiconductor module  160  are covered with the resin mold  620 , the heat generated by the semiconductor module  160  and the like is radiated in the housings  670  and  671  efficiently. Further, by increasing the thermal conductivity km and kg to be higher than the thermal conductivity of the configuration on the wiring substrate  650  side (for example, the thermal conductivity of the resist portion  653 ), the efficiency is higher and the heat can be radiated to the housing  670 ,  671  side. The thermal conductivity of the housing  670 ,  671  made of aluminum is about 100 to 300 W/(m·K), which is remarkably high with respect to km, and kg. 
     Further, since the non-mounting surface of the semiconductor module  160  is covered with the resin mold  620  and the conductive member functioning as an electrode is not exposed, the thickness dg of the heat radiation member  680  can be reduced, compared with the semiconductor module in which the electrode is exposed on the non-mounting surface. The resin mold  620  has higher insulating properties than the heat radiation member  680 , and the thickness required for ensuring insulation is small. Therefore, the distance between the lower surface of the electrode on the non-mounting surface side of the semiconductor module  160  (i.e., the conductive members  631 ,  641  in this embodiment) and the upper surface of the housing  671  can be shortened, compared with the semiconductor module in which the electrode is exposed on the non-mounting surface. As a result, according to the semiconductor module  160 , the mounting portion can be made smaller than before. 
     In  FIGS. 45 and 46 , the mounting state of the semiconductor module  160  according to the sixth embodiment has been described. Alternatively, among the semiconductor modules described in each of the above embodiments, the semiconductor module (for example, semiconductor modules  10 ,  20 ,  30 ,  40 ,  50 ) in which the non-mounting surface is covered with the resin mold may be replaced with the semiconductor module  160  shown in  FIGS. 45, and 46 . 
     According to the embodiments described above, the following effects can be obtained. 
     The semiconductor modules  10  to  13 ,  20  to  23 ,  30  to  33 ,  40 ,  50 ,  160  includes: a plurality of semiconductor elements (for example, the first semiconductor element  133  and the second semiconductor element  143 ); a resin mold (for example, a resin mold  120 ) that integrally sealing the plurality of semiconductor elements; and a plurality of conductive members (for example,  101  to  104 ,  111  to  116 ) electrically connected to at least one of the plurality of semiconductor elements. 
     In each of the above semiconductor modules, the plurality of semiconductor elements include a gate electrode  75 , a first electrode (i.e., a source electrode  71 ), and a second electrode (i.e., a drain electrode  72 ), and are insulated gate type semiconductor elements in which a carrier moves from the first electrode side of the semiconductor element to the second electrode side through a carrier which is formed by applying a voltage to the gate electrode  75 . 
     Further, in each of the above-mentioned semiconductor modules, a plurality of conductive members are exposed from the resin mold on the upper surface side or the lower surface side of the semiconductor module, and include the common wiring electrode (for example,  111 ,  113 ,  115 ) that is electrically connected to at least one of the first electrode and the second electrode and a non-common wiring electrode (for example,  101  to  104 ,  112 ,  114 ,  116 ). The non-common wiring electrode is an electrode exposed from the resin mold and electrically connected to an electrode of a semiconductor element different from the common wiring electrode. In other words, the non-common wiring electrode is an electrode exposed from the resin mold and connected to any of a plurality of semiconductor elements included in the semiconductor module, and has a connection destination different from the electrode of the semiconductor element to which the common wiring electrode is connected. Further, the wiring width of the common electrode connected to the common wiring electrode is wider than the wiring width of the non-common wiring electrode. Then, when the common wiring is connected to the common wiring electrode, the plurality of semiconductor elements and the plurality of conductive members are arranged so as to arrange the common wiring from one opposite side to the other side on the surface of the resin mold, on which the common wiring electrode is exposed, without being electrically connected to the non-common wiring electrode. 
     According to semiconductor modules  10  to  13 ,  20  to  23 ,  30  to  33 ,  40 ,  50 ,  160 , for example, by arranging a plurality of semiconductor modules adjacent to each other and connecting the common wiring electrodes to each other by the common wiring, a plurality of semiconductor modules can be electrically connected to each other in the up-down direction of the semiconductor module. As a result, the wiring space on the side of the semiconductor module can be reduced, which can contribute to the downsizing of the mounting board. Further, in order to connect a plurality of semiconductor elements, it is possible to omit the wiring taken out to the side of the semiconductor element. As a result, the wiring area is reduced, the wiring resistance is reduced, and heat generation due to wiring can be suppressed. 
     The semiconductor modules  10  to  13 ,  20  to  23 ,  30  to  33 ,  40 ,  50 ,  160  include the common wiring region (for example, the common wiring regions A 1   c , A 2   c , A 3   c , A 4   c , A 5   c , A 6   a ) which is a strip-shaped region extending substantially straight from one opposite side to the other on the surface of the resin mold on which the common wiring electrodes are exposed, and includes the common wiring region (for example, the common wiring regions A 1   c , A 2   c , A 3   c , A 4   c , A 5   c , A 6   a ) in which the common wiring electrode exists and the non-common wiring electrode does not exist. Then, the common wiring is arranged in the common wiring region. While the common wiring electrode exists in the common wiring area, the non-common wiring electrode does not exist, so that the common wiring is arranged from one opposite side to the other on the surface of the resin mold where the common wiring electrode (for example, the conductive member  111 ) is exposed without electrically connecting to the non-common wiring electrode (for example, conductive members  101  to  104 ,  112 ). 
     A plurality of semiconductor elements, such as the semiconductor modules  10  to  13 ,  40 , and  50 , may be arranged substantially in parallel with the adjacent semiconductor elements in the same direction as the adjacent semiconductor elements. Further, a plurality of semiconductor elements such as the semiconductor modules  20  to  23 ,  30  to  33 ,  160  may be arranged substantially point-symmetrically with the adjacent semiconductor elements in the opposite direction to the adjacent semiconductor elements. 
     Like the semiconductor modules  30  to  33 , the plurality of conductive members may include a connection conductive member (i.e., the conductive member  312 ) for connecting the first electrode (i.e., the source electrode) of the first semiconductor element  333  and the second electrode (i.e., the drain electrode) of the semiconductor element  343  disposed adjacent to the first semiconductor element  333  among the plurality of semiconductor elements. 
     At least one of the non-common wiring electrodes may have a high step portion (for example, a high step portion  112   b ) higher toward the surface side exposed from the resin mold and a low step portion (for example, a low step portion  112   a ) lower than the high step portion. By lowering the low step portion to such an extent that it is not electrically connected to the common wiring, it is possible to prevent the common wiring from being electrically connected to the non-common wiring electrode. Further, it may be preferable that the surface of the low step portion near the common wiring (for example, the surface of the low step portion  112   a  in the negative direction of the z-axis) is insulated. By insulating the surface of the low step portion near the common wiring, the distance between the common wiring and the low step portion can be narrowed as compared with the case where the low step portion is not insulated. Further, it may be more preferable to insulate the low step portion by covering it with an insulating resin mold. That is, it may be more preferable that the high step portion is exposed from the resin mold and the low step portion is not exposed from the resin mold. 
     Further, like the semiconductor modules  40  and  50 , the common wiring electrode may extend to a position where it protrudes from both of the opposite pair of sides of the surface of the resin mold. 
     Further, each of the above semiconductor modules may be mounted on a wiring board (for example, a wiring board  650 ) with the surface on which the common wiring electrodes are exposed as a mounting surface. When the wiring board includes a wiring portion in which the semiconductor module is installed and a resist portion provided around the wiring portion, the resin mold may preferably have a higher thermal conductivity than the resist portion. The heat radiation of the wiring board and the semiconductor module can be promoted through the resin mold. 
     The surface facing the exposed surface of the common wiring electrode of the semiconductor module, such as the semiconductor modules  10 ,  20 ,  30 ,  40 ,  50 ,  160 , may be covered with a resin mold. For example, as in the semiconductor module  160  illustrated and described, the module  1160  is arranged between the wiring board  650 , on which the semiconductor module is mounted with the surface on which the common wiring electrodes are exposed as the mounting surface, and the housing  670 ,  671  disposed on the side facing the surface on which the common wiring electrodes are exposed, it can be suitably used. Specifically, by arranging the resin mold and the housing so as to be in contact with each other, the heat generated in the semiconductor module or the wiring board can be radiated to the housing side via the resin mold. Further, the resin mold may be configured to be in contact with the housing via a heat radiation member arranged between the resin mold and the housing. In this case, the thermal conductivity of the heat radiation member may be preferably equal to or higher than the thermal conductivity of the resin mold. 
     Each of the above semiconductor modules can be suitably used for mounting on the electric power steering system  80 , and can contribute to minimizing the size and promoting heat radiation in the drive circuit and the like. 
     In the embodiments described above, a trench gate type MOSFET in which an n-channel is provided by application of a gate voltage is exemplified as a device structure of the semiconductor element, but the semiconductor element structure is not limited to the above example. For example, the semiconductor element structure may be a planar gate type, a p-channel type in which p-type and n-type are substituted in  FIG. 6 , an insulated gate bipolar transistor (IGBT) or a reverse conduction IGBT (RC-IGBT). When the semiconductor element is an IGBT, the emitter electrode corresponds to a first electrode, and the collector electrode corresponds to a second electrode. An external terminal electrically connected to the emitter electrode corresponds to a first terminal, and an external terminal electrically connected to the collector electrode corresponds to a second terminal. 
     In  FIG. 8 , the switches SU 1   p  to SW 2   n  and SP 1 , SC 1 , SP 2 , SC 2  are not limited to the MOSFET of the first semiconductor element  133  and the second semiconductor element  143 , and a voltage-controlled semiconductor switching element such as an IGBT may be used. When an IGBT including no freewheeling diode is used as each of the switches SU 1   p  to SW 2   n , it is preferable to install a freewheeling diode for each of the switches SU 1   p  to SW 2   n . Specifically, for example, a freewheeling diode may be connected in anti-parallel to each of the switches SU 1   p  to SW 2   n , or a reverse conduction IGBT (RC-IGBT) in which the freewheeling diode is formed in the same semiconductor substrate as the semiconductor substrate of IGBT or the like may be used as each of the switches SU 1   p  to SW 2   n.    
     The shapes of the multiple semiconductor elements, the resin mold, the first joint member, and the like are not limited to the case in which the shape is substantially rectangular when viewed from the top. The number of external terminals is not limited to the number described in each of the embodiments described above. For example, multiple gate terminals may be provided for each of the semiconductor elements. The drain terminal and the source terminal may have one or two terminals, or may have four or more terminals. 
     While the present disclosure has been described with reference to embodiments thereof, it is to be understood that the disclosure is not limited to the embodiments and constructions. The present disclosure is intended to cover various modification and equivalent arrangements. In addition, while the various combinations and configurations, other combinations and configurations, including more, less or only a single element, are also within the spirit and scope of the present disclosure.