Semiconductor Device

Abstract

This semiconductor device includes a first insulating substrate, a second insulating substrate, a first arm, a second arm connected to the first arm, and a first conductive pattern provided on the first insulating substrate, wherein: the first arm has a plurality of first transistor chips provided on the first insulating substrate; the second arm has a semiconductor chip provided on the second insulating substrate; the plurality of first transistor chips are arranged adjacent to each other on the first insulating substrate; first electrodes of the plurality of first transistors are directly connected to the first conductive pattern; and the first electrodes are source electrodes or emitter electrodes.

Description

[Technical field]

[0001] The present disclosure relates to a semiconductor device.

[0002] This application claims priority to Japanese Application No. 2020-157444, filed on September 18, 2020, and incorporates by reference all of the contents of said Japanese application. [Background technology]

[0003] As a semiconductor device used in a power module, a semiconductor device in which a source electrode or an emitter electrode of a transistor and an anode electrode of a diode are connected to each other has been proposed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2015-154079 [Patent Document 2] Japanese Patent Application Publication No. 2019-71490 [Patent Document 3] US Patent Application Publication No. 2017 / 0125322 Summary of the Invention

[0005] The semiconductor device disclosed herein comprises a first insulating substrate, a second insulating substrate, a first arm, a second arm connected to the first arm, and a first conductive pattern provided on the first insulating substrate, the first arm having a plurality of first transistor chips provided on the first insulating substrate, the second arm having a semiconductor chip provided on the second insulating substrate, the plurality of first transistor chips being arranged adjacent to each other on the first insulating substrate, first electrodes of the plurality of first transistors being directly connected to the first conductive pattern, and the first electrodes being source electrodes or emitter electrodes. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing a semiconductor device according to a first embodiment. [Diagram 2] FIG. 2 is a top view showing the semiconductor device according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing the relationship between the heat sink, the first insulating substrate, and the second insulating substrate in the semiconductor device according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view showing the first transistor. [Diagram 5] FIG. 5 is a cross-sectional view showing the first diode. [Figure 6] FIG. 6 is a cross-sectional view showing a second transistor. [Figure 7] FIG. 7 is a cross-sectional view showing the second diode. [Figure 8] FIG. 8 is a circuit diagram showing the semiconductor device according to the first embodiment. [Figure 9] FIG. 9 is a schematic diagram (part 1) showing the operation of the semiconductor device according to the first embodiment. [Figure 10] FIG. 10 is a schematic diagram (part 2) showing the operation of the semiconductor device according to the first embodiment. [Figure 11] FIG. 11 is a schematic diagram (part 3) illustrating the operation of the semiconductor device according to the first embodiment. [Figure 12] FIG. 12 is a schematic diagram (part 4) illustrating the operation of the semiconductor device according to the first embodiment. [Figure 13] FIG. 13 is a cross-sectional view showing a modified example of the heat sink. [Figure 14] FIG. 14 is a schematic diagram showing the configurations of the first insulating substrate and the second insulating substrate in the semiconductor device according to the second embodiment. [Figure 15] FIG. 15 is a top view showing the semiconductor device according to the third embodiment. [Figure 16] FIG. 16 is a top view showing the semiconductor device according to the fourth embodiment. [Figure 17] FIG. 17 is a circuit diagram showing a semiconductor device according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] [Problem that this disclosure aims to solve] It is desirable to achieve more stable operation of multiple transistors connected in parallel.

[0008] An object of the present disclosure is to provide a semiconductor device capable of realizing more stable operation of a plurality of transistors connected in parallel.

[0009] [Effects of this disclosure] According to the present disclosure, it is possible to realize more stable operation of multiple transistors connected in parallel.

[0010] The embodiments for carrying out the invention are described below.

[0011] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be described. In the following description, the same or corresponding elements are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0012] [1] A semiconductor device according to one embodiment of the present disclosure comprises a first insulating substrate, a second insulating substrate, a first arm, a second arm connected to the first arm, and a first conductive pattern provided on the first insulating substrate, the first arm having a plurality of first transistor chips provided on the first insulating substrate, the second arm having a semiconductor chip provided on the second insulating substrate, the plurality of first transistor chips being arranged adjacent to each other on the first insulating substrate, first electrodes of the plurality of first transistors being directly connected to the first conductive pattern, and the first electrodes being source electrodes or emitter electrodes.

[0013] The first arm includes a plurality of first transistors arranged adjacent to each other on a first insulating substrate. The first electrode is directly connected to the first conductive pattern. The second arm includes a semiconductor chip arranged on a second insulating substrate. This reduces the inductance of each power loop of the first transistors, and suppresses the variation in the inductance of the power loops among the first transistors. This allows the first transistors connected in parallel to operate more stably.

[0014] [2] In the configuration of [1], the first transistor chips may be concentrated in a rectangular first region. In this case, it is easy to suppress variation in inductance of a power loop.

[0015] [3] In the configuration of [1] or [2], the plurality of first transistor chips may be arranged side by side in a first direction. In this case, it is easy to consolidate the plurality of first transistors and suppress variation in inductance of a power loop.

[0016] [4] In any one of [1] to [3], the semiconductor chip may have a second transistor chip. In this case, the semiconductor device can be operated as an inverter.

[0017] [5] In any one of [1] to [3], the semiconductor chip may have a second conductive pattern provided on the second insulating substrate, the semiconductor chip may have a plurality of second transistor chips, the plurality of second transistor chips may be arranged adjacent to each other on the second insulating substrate, the second electrodes of the plurality of second transistors may be directly connected to the second conductive pattern, and the second electrodes may be source electrodes or emitter electrodes. In this case, more stable operation of the plurality of second transistors connected in parallel may be achieved.

[0018] [6] In the configuration of [5], the second transistor chips may be concentrated in a rectangular second region. In this case, it is easy to suppress variation in inductance of a power loop.

[0019] [7] In the configuration of [5] or [6], the second transistor chips may be arranged side by side in the second direction. In this case, the second transistors are aggregated to easily suppress variations in inductance of the power loop.

[0020] [8] In any one of [4] to [7], the second arm may have a first diode chip connected in parallel to the second transistor chip, and the first diode chip may be provided on the first insulating substrate. In this case, the first diode chip may function as a free wheel diode for the second transistor chip.

[0021] [9] In the above [8], the first diode chip may be a Schottky barrier diode made of silicon carbide. In this case, the first diode chip has an excellent breakdown voltage.

[0022]

[10] In any of [4] to [9], the second transistor chip may be a field effect transistor made of silicon carbide, in which case the second transistor chip has excellent breakdown voltage.

[0023]

[11] In any of [4] to

[10] , the semiconductor device may have a second control terminal connected to the second control electrodes of the second transistors, and the second control terminal may be disposed closer to the second insulating substrate than the first insulating substrate. In this case, the second transistors can be concentrated in the vicinity of the second control terminal. This makes it easier to reduce the difference in gate loop inductance between the second transistors. This makes it easier to realize a more stable operation of the second transistors connected in parallel.

[0024]

[12] In any one of [1] to [3], the semiconductor chip may have a second diode chip. In this case, the semiconductor device can be operated as a converter.

[0025]

[13] In the above

[12] , the second diode chip may be a Schottky barrier diode made of silicon carbide. In this case, the second diode chip has an excellent breakdown voltage.

[0026]

[14] In any one of [1] to

[13] , the first arm may have a third diode chip connected in parallel to the first transistor chip, and the third diode chip may be provided on the second insulating substrate. In this case, the third diode chip may function as a free wheel diode for the first transistor chip.

[0027]

[15] In the above

[14] , the third diode chip may be a Schottky barrier diode made of silicon carbide. In this case, the third diode chip has an excellent breakdown voltage.

[0028]

[16] In any of [1] to

[15] , the semiconductor device may have a first control terminal connected to the first control electrodes of the first transistors, and the first control terminal may be disposed closer to the first insulating substrate than the second insulating substrate. In this case, the first transistors can be concentrated in the vicinity of the first control terminal. This makes it easier to reduce the difference in gate loop inductance between the first transistors. This makes it easier to realize a more stable operation of the first transistors connected in parallel.

[0029]

[17] In any of [1] to

[16] , the first transistor chip may be a field effect transistor made of silicon carbide, in which case the first transistor chip has excellent breakdown voltage.

[0030]

[18] In any of [1] to

[16] , a heat sink may be provided with a first main surface and a second main surface opposite to the first main surface, and the first insulating substrate and the second insulating substrate may be mounted on the first main surface. In this case, heat generated in the first insulating substrate and the second insulating substrate may be easily released.

[0031]

[19] In the device of

[18] , the second main surface may be curved in a convex shape. In this case, a thermal interface material or the like may be used to bring the heat sink into close contact with a cooler or the like, making it easier to obtain good heat transfer efficiency.

[0032] [Details of the embodiment of the present disclosure] Hereinafter, the embodiments of the present disclosure will be described in detail, but the present embodiments are not limited thereto. In addition, in this specification and drawings, components having substantially the same functional configurations may be denoted by the same reference numerals to avoid redundant description.

[0033] (First embodiment) First, the first embodiment will be described. Fig. 1 is a perspective view showing the semiconductor device according to the first embodiment. Fig. 2 is a top view showing the semiconductor device according to the first embodiment. However, in Fig. 2, the case is seen through. Fig. 3 is a cross-sectional view showing the relationship between the heat sink, the first insulating substrate, and the second insulating substrate in the semiconductor device according to the first embodiment. Fig. 3 corresponds to a cross-sectional view taken along line III-III in Fig. 2.

[0034] The semiconductor device 1 according to the first embodiment mainly includes a heat sink 2, a case 9, a P terminal 3, an N terminal 4, a first O terminal 5, and a second O terminal 6. The P terminal 3 is a power supply terminal on the positive electrode side, the N terminal 4 is a power supply terminal on the negative electrode side, and the first O terminal 5 and the second O terminal 6 are output terminals. The P terminal 3, the N terminal 4, the first O terminal 5, and the second O terminal 6 are assembled to the case 9. The case 9 further includes a first gate terminal 131, a first sense source terminal 132, a sense drain terminal 133, a second gate terminal 231, a second sense source terminal 232, a first thermistor terminal 331, and a second thermistor terminal 332.

[0035] In this disclosure, the X1-X2 direction, the Y1-Y2 direction, and the Z1-Z2 direction are defined as mutually orthogonal directions. A plane including the X1-X2 direction and the Y1-Y2 direction is defined as the XY plane, a plane including the Y1-Y2 direction and the Z1-Z2 direction is defined as the YZ plane, and a plane including the Z1-Z2 direction and the X1-X2 direction is defined as the ZX plane. For convenience, the Z1 direction is defined as the upward direction, and the Z2 direction is defined as the downward direction. In addition, in this disclosure, a planar view means viewing an object from the Z1 side. The X1-X2 direction is a direction along the long side of the rectangular heat sink 2 and case 9 in a planar view, the Y1-Y2 direction is a direction along the short side of the heat sink 2 and case 9, and the Z1-Z2 direction is a direction along the normal to the heat sink 2 and case 9.

[0036] The heat sink 2 is, for example, a rectangular plate-like body with a uniform thickness in a plan view. The heat sink 2 has a first main surface 2A and a second main surface 2B opposite to the first main surface 2A. The material of the heat sink 2 is a metal with high thermal conductivity, such as copper (Cu), a copper alloy, or aluminum (Al). The heat sink 2 is fixed to a cooler or the like using a thermal interface material (TIM) or the like.

[0037] The case 9 is formed, for example, in a frame shape in a plan view, and the outer shape of the case 9 is the same as the outer shape of the heat sink 2. The material of the case 9 is an insulating material such as resin. The case 9 has a pair of side walls 91 and 92 facing each other, and a pair of end walls 93 and 94 connecting both ends of the side walls 91 and 92. The side walls 91 and 92 are arranged parallel to the ZX plane, and the end walls 93 and 94 are arranged parallel to the YZ plane. The side wall 92 is arranged on the Y2 side of the side wall 91, and the end wall 94 is arranged on the X2 side of the end wall 93. The case 9 has a terminal block 95 protruding from the end wall 93 in the X1 direction, and a terminal block 96 protruding from the end wall 94 in the X2 direction.

[0038] The P terminal 3 and the N terminal 4 are arranged on the upper surface (surface on the Z1 side) of the terminal block 95, and the first O terminal 5 and the second O terminal 6 are arranged on the upper surface (surface on the Z1 side) of the terminal block 96. For example, the N terminal 4 is arranged on the Y2 side of the P terminal 3, and the second O terminal 6 is arranged on the Y2 side of the first O terminal 5. The P terminal 3, the N terminal 4, the first O terminal 5, and the second O terminal 6 are made of metal plates. One end of each of the P terminal 3 and the N terminal 4 is exposed on the X2 side of the end wall portion 93, and the other end of each is drawn out to the upper surface of the terminal block 95. One end of each of the first O terminal 5 and the second O terminal 6 is exposed on the X1 side of the end wall portion 94, and the other end of each is drawn out to the upper surface of the terminal block 96.

[0039] The first gate terminal 131, the first sense source terminal 132, the sense drain terminal 133, the first thermistor terminal 331, and the second thermistor terminal 332 are attached to the side wall portion 91. One end of each of the first gate terminal 131, the first sense source terminal 132, the sense drain terminal 133, the first thermistor terminal 331, and the second thermistor terminal 332 is exposed on the Y2 side of the side wall portion 91, and the other end of each protrudes from the upper surface (surface on the Z1 side) of the side wall portion 91 to the outside (Z1 side) of the case 9. The sense drain terminal 133 is disposed near the end of the X2 side of the side wall portion 91. The first thermistor terminal 331 and the second thermistor terminal 332 are disposed near the end of the X1 side of the side wall portion 91. For example, the second thermistor terminal 332 is disposed on the X1 side of the first thermistor terminal 331. The first gate terminal 131 and the first sense source terminal 132 are disposed near the center in the X1-X2 direction of the side wall portion 91 and on the X2 side of the center in the X1-X2 direction. For example, the first sense source terminal 132 is disposed on the X2 side of the first gate terminal 131.

[0040] A second gate terminal 231 and a second sense source terminal 232 are attached to the side wall portion 92. One end of each of the second gate terminal 231 and the second sense source terminal 232 is exposed on the Y1 side of the side wall portion 92, and the other end of each protrudes from the upper surface (surface on the Z1 side) of the side wall portion 92 to the outside (Z1 side) of the case 9. The second gate terminal 231 and the second sense source terminal 232 are disposed near the center of the side wall portion 92 in the X1-X2 direction and on the X1 side of the center in the X1-X2 direction. For example, the second sense source terminal 232 is disposed on the X1 side of the second gate terminal 231.

[0041] A first insulating substrate 10 and a second insulating substrate 20 are disposed on the Z1 side of the heat sink 2. That is, the first insulating substrate 10 and the second insulating substrate 20 are disposed on the first main surface 2A of the heat sink 2. For example, the second insulating substrate 20 is disposed on the X1 side of the first insulating substrate 10.

[0042] The first insulating substrate 10 has conductive layers 11, 12, 13, 14, and 18 on the Z1 side surface, and a conductive layer 19 on the Z2 side surface. The conductive layer 19 is joined to the heat sink 2 by a bonding material 7 such as solder. A plurality of, for example, four, first transistors 110 are mounted on the conductive layer 13. The four first transistors 110 are arranged in the X1-X2 direction. A first transistor group 110A is composed of the four first transistors 110. A plurality of, for example, eight second diodes 220 are mounted on the conductive layer 12. The eight second diodes 220 are arranged in two rows, four diodes per row, in the X1-X2 direction. A second diode group 220A is composed of the eight second diodes 220. The conductive layer 12 is an example of a first conductive pattern. The first transistor 110 is an example of a first transistor chip. The second diode 220 is an example of a semiconductor chip and a first diode chip.

[0043] The four first transistors 110 are arranged adjacent to each other in a first transistor aggregate region 110R having a rectangular shape in a plan view. That is, the four first transistors 110 are aggregated in the first transistor aggregate region 110R. The eight second diodes 220 are arranged adjacent to each other in a second diode aggregate region 220R having a rectangular shape in a plan view. That is, the eight second diodes 220 are aggregated in the second diode aggregate region 220R. The first transistor aggregate region 110R is an example of a first region.

[0044] The second insulating substrate 20 has conductive layers 21, 22, 23, 24, 25, 26, 27, and 28 on the Z1 side surface, and a conductive layer 29 on the Z2 side surface. The conductive layer 29 is joined to the heat sink 2 by a bonding material 8 such as solder. A plurality of, for example, four second transistors 210 are mounted on the conductive layer 23. The four second transistors 210 are aligned in the X1-X2 direction. A second transistor group 210A is configured from the four second transistors 210. A plurality of, for example, eight first diodes 120 are mounted on the conductive layer 25. The eight first diodes 120 are aligned in two rows of four in the X1-X2 direction. A first diode group 120A is configured from the eight first diodes 120. The conductive layer 22 is an example of a second conductive pattern. The second transistor 210 is an example of a second transistor chip. The first diode 120 is an example of a semiconductor chip and a third diode chip.

[0045] The four second transistors 210 are arranged adjacent to each other in a rectangular second transistor aggregated region 210R in a plan view. That is, the four second transistors 210 are aggregated in the second transistor aggregated region 210R. The eight first diodes 120 are arranged adjacent to each other in a rectangular first diode aggregated region 120R in a plan view. That is, the eight first diodes 120 are aggregated in the first diode aggregated region 120R. The second transistor aggregated region 210R is an example of a second region. The X1-X2 direction is also an example of a second direction.

[0046] In a plan view, the first diode aggregate region 120R is spaced apart from the first transistor aggregate region 110R, and the first transistor aggregate region 110R and the first diode aggregate region 120R do not have an overlapping region. A first diode 120 is not arranged between adjacent first transistors 110. In a plan view, the second transistor aggregate region 210R is spaced apart from the second diode aggregate region 220R, and the second transistor aggregate region 210R and the second diode aggregate region 220R do not have an overlapping region. A second diode 220 is not arranged between adjacent second transistors 210.

[0047] Here, the first transistor 110, the first diode 120, the second transistor 210, and the second diode 220 will be described. Fig. 4 is a cross-sectional view showing the first transistor. Fig. 5 is a cross-sectional view showing the first diode. Fig. 6 is a cross-sectional view showing the second transistor. Fig. 7 is a cross-sectional view showing the second diode.

[0048] 4, the first transistor 110 has a first gate electrode 111, a first source electrode 112, and a first drain electrode 113. The first gate electrode 111 and the first source electrode 112 are disposed on a main surface of the first transistor 110 on the Z1 side, and the first drain electrode 113 is disposed on a main surface of the first transistor 110 on the Z2 side. The first drain electrode 113 is bonded to the conductive layer 13 by a bonding material (not shown) such as solder. The first source electrode 112 is an example of a first electrode.

[0049] 5, the first diode 120 has a first anode electrode 121 and a first cathode electrode 122. The first anode electrode 121 is disposed on a main surface on the Z1 side of the first diode 120, and the first cathode electrode 122 is disposed on a main surface on the Z2 side of the first diode 120. The first cathode electrode 122 is joined to the conductive layer 25 by a joining material (not shown) such as solder.

[0050] 6, the second transistor 210 has a second gate electrode 211, a second source electrode 212, and a second drain electrode 213. The second gate electrode 211 and the second source electrode 212 are disposed on the main surface of the second transistor 210 on the Z1 side, and the second drain electrode 213 is disposed on the main surface of the second transistor 210 on the Z2 side. The second drain electrode 213 is bonded to the conductive layer 23 by a bonding material (not shown) such as solder. The second source electrode 212 is an example of a second electrode.

[0051] 7, the second diode 220 has a second anode electrode 221 and a second cathode electrode 222. The second anode electrode 221 is disposed on a main surface on the Z1 side of the second diode 220, and the second cathode electrode 222 is disposed on a main surface on the Z2 side of the second diode 220. The second cathode electrode 222 is bonded to the conductive layer 12 by a bonding material (not shown) such as solder.

[0052] The semiconductor device 1 has a plurality of wires 31, a plurality of wires 32, a plurality of wires 41, and a plurality of wires 42. The wires 31 connect the conductive layer 13 provided on the first insulating substrate 10 and the conductive layer 25 provided on the second insulating substrate 20. The wires 32 connect the conductive layer 12 provided on the first insulating substrate 10 and the conductive layer 24 provided on the second insulating substrate 20. The wires 41 connect the conductive layer 12 provided on the first insulating substrate 10 and the conductive layer 23 provided on the second insulating substrate 20. The wires 42 connect the conductive layer 14 provided on the first insulating substrate 10 and the conductive layer 22 provided on the second insulating substrate 20.

[0053] The semiconductor device 1 has a plurality of wires 51, a plurality of wires 52, a plurality of wires 53, a plurality of wires 54, and a plurality of wires 55. The wires 51 connect the first gate electrodes 111 provided on the four first transistors 110 to the conductive layer 11 provided on the first insulating substrate 10. The wires 52 connect the first source electrodes 112 provided on the four first transistors 110 to the conductive layer 12 provided on the first insulating substrate 10. The wires 53 connect the first sense source electrodes (not shown) provided on the four first transistors 110 to the conductive layer 18 provided on the first insulating substrate 10. The wires 54 connect the second anode electrodes 221 provided on the four second diodes 220 arranged on the Y1 side among the eight second diodes 220 to the conductive layer 14 provided on the first insulating substrate 10. The wire 55 connects the second anode electrodes 221 provided on the four second diodes 220 arranged on the Y1 side among the eight second diodes 220 to the second anode electrodes 221 provided on the four second diodes 220 arranged on the Y2 side.

[0054] The semiconductor device 1 has a wire 61, a plurality of wires 62, a plurality of wires 63, a wire 64, and a wire 65. The wire 61 connects the conductive layer 11 provided on the first insulating substrate 10 to the first gate terminal 131. The wire 62 connects the conductive layer 12 provided on the first insulating substrate 10 to the first O terminal 5. The wire 63 connects the conductive layer 12 provided on the first insulating substrate 10 to the second O terminal 6. The wire 64 connects the conductive layer 13 provided on the first insulating substrate 10 to the sense drain terminal 133. The wire 65 connects the conductive layer 18 provided on the first insulating substrate 10 to the first sense source terminal 132.

[0055] The semiconductor device 1 has a plurality of wires 71, a plurality of wires 72, a plurality of wires 73, a plurality of wires 74, and a plurality of wires 75. The wires 71 connect the second gate electrodes 211 provided on the four second transistors 210 to the conductive layer 21 provided on the second insulating substrate 20. The wires 72 connect the second source electrodes 212 provided on the four second transistors 210 to the conductive layer 22 provided on the second insulating substrate 20. The wires 73 connect the second sense source electrodes (not shown) provided on the four second transistors 210 to the conductive layer 28 provided on the second insulating substrate 20. The wires 74 connect the first anode electrodes 121 provided on the four first diodes 120 arranged on the Y2 side among the eight first diodes 120 to the conductive layer 24 provided on the second insulating substrate 20. The wire 75 connects the first anode electrodes 121 provided on the four first diodes 120 arranged on the Y2 side among the eight first diodes 120 to the first anode electrodes 121 provided on the four first diodes 120 arranged on the Y1 side.

[0056] The semiconductor device 1 includes a wire 81, a plurality of wires 82, a plurality of wires 83, a wire 85, a wire 86, and a wire 87. The wire 81 connects the conductive layer 21 provided on the second insulating substrate 20 to the second gate terminal 231. The wire 82 connects the conductive layer 22 provided on the second insulating substrate 20 to the N terminal 4. The wire 83 connects the conductive layer 25 provided on the second insulating substrate 20 to the P terminal 3. The wire 85 connects the conductive layer 28 provided on the second insulating substrate 20 to the second sense source terminal 232. The wire 86 connects the conductive layer 26 provided on the second insulating substrate 20 to the first thermistor terminal 331. The wire 87 connects the conductive layer 27 provided on the second insulating substrate 20 to the second thermistor terminal 332. The semiconductor device 1 includes a thermistor 330 connected to the conductive layer 26 and the conductive layer 27 .

[0057] Here, a description will be given of the circuit configuration of the semiconductor device 1 according to the first embodiment. Fig. 8 is a circuit diagram showing the semiconductor device according to the first embodiment.

[0058] A first cathode electrode 122 of the first diode 120 is connected to the P terminal 3 via a wire 83 and a conductive layer 25. A first drain electrode 113 of the first transistor 110 is connected to the P terminal 3 via a wire 83, a conductive layer 25, a wire 31, and a conductive layer 13. The conductive layer 12 is connected to the first O terminal 5 via a wire 62, and to the second O terminal 6 via a wire 63. A first source electrode 112 of the first transistor 110 is connected to the conductive layer 12 via a wire 52. A first anode electrode 121 of the first diode is connected to the conductive layer 12 via a wire 32, a conductive layer 24, and wires 74 and 75.

[0059] A first gate electrode 111 of the first transistor 110 is connected to a first gate terminal 131 via a wire 61, a conductive layer 11, and a wire 51. A first sense source electrode of the first transistor 110 is connected to a first sense source terminal 132 via a wire 65, a conductive layer 18, and a wire 53. A first drain electrode 113 of the first transistor 110 is connected to a sense drain terminal 133 via a wire 64 and a conductive layer 13. The first gate electrode 111 is an example of a first control electrode, and the first gate terminal 131 is an example of a first control terminal.

[0060] A second source electrode 212 of the second transistor 210 is connected to the N terminal 4 via a wire 82, a conductive layer 22, and a wire 72. A second anode electrode 221 of the second diode 220 is connected to the N terminal 4 via a wire 82, a conductive layer 22, a wire 42, and wires 54 and 55. diode 2 2 A second cathode electrode 222 of the second transistor 210 is connected to the conductive layer 12. A second drain electrode 213 of the second transistor 210 is connected to the conductive layer 12 via a wire 41 and a conductive layer .

[0061] A second gate electrode 211 of the second transistor 210 is connected to the second gate terminal 231 via a wire 81, a conductive layer 21, and a wire 71. A second sense source electrode of the second transistor 210 is connected to the second sense source terminal 232 via a wire 85, a conductive layer 28, and a wire 73. One electrode of the thermistor 330 is connected to the first thermistor terminal 331 via a wire 86 and a conductive layer 26. The other electrode of the thermistor 330 is connected to the second thermistor terminal 332 via a wire 87 and a conductive layer 27. The second gate electrode 211 is an example of a second control electrode, and the second gate terminal 231 is an example of a second control terminal.

[0062] As shown in FIG. 8, the first drain electrode 113 of the first transistor 110 and the first cathode electrode 122 of the first diode 120 are commonly connected to the P terminal 3, and the first source electrode 112 and the first anode electrode 121 are commonly connected to the first O terminal 5 and the second O terminal 6. That is, the first transistor 110 and the first diode 120 are connected in parallel between the P terminal 3 and the first O terminal 5 and the second O terminal 6. In addition, the second drain electrode 213 of the second transistor 210 and the second cathode electrode 222 of the second diode 220 are commonly connected to the first O terminal 5 and the second O terminal 6, and the second source electrode 212 and the second anode electrode 221 are commonly connected to the N terminal 4. That is, the second transistor 210 and the second diode 220 are connected in parallel between the N terminal 4 and the first O terminal 5 and the second O terminal 6. The upper arm 100 includes a first transistor 110 (first transistor group 110A) and a first diode 120 (first diode group 120A). The lower arm 200 includes a second transistor 210 (second transistor group 210A) and a second diode 220 (second diode group 220A). The upper arm 100 and the lower arm 200 are connected in series between the P terminal 3 and the N terminal 4. The upper arm 100 is an example of a first arm, and the lower arm 200 is an example of a second arm.

[0063] The multiple first transistors 110 included in the upper arm 100 may be provided only on the first insulating substrate 10, and the multiple first diodes 120 included in the upper arm 100 may be provided only on the second insulating substrate 20. Also, the multiple second transistors 210 included in the lower arm 200 may be provided only on the second insulating substrate 20, and the multiple second diodes 220 included in the lower arm 200 may be provided only on the first insulating substrate 10.

[0064] Next, a description will be given of the operation of the semiconductor device 1 according to the first embodiment. Figures 9 to 12 are schematic diagrams showing the operation of the semiconductor device according to the first embodiment.

[0065] 9 shows a path of a current I1 flowing from the P terminal 3 to the first O terminal 5 and the second O terminal 6. As shown in FIG. 9, the current I1 flows from the P terminal 3 to the first O terminal 5 and the second O terminal 6 via the wire 83, the conductive layer 25, the wire 31, the conductive layer 13, the first transistor group 110A, the wire 52, the conductive layer 12, and the wires 62 and 63.

[0066] 10 shows a path of a current I2 flowing from the first O terminal 5 and the second O terminal 6 to the P terminal 3. As shown in FIG 10, the current I2 flows from the first O terminal 5 and the second O terminal 6 to the P terminal 3 via the wires 62 and 63, the conductive layer 12, the wire 32, the conductive layer 24, the wires 74 and 75, the first diode group 120A, the conductive layer 25, and the wire 83.

[0067] In this way, the current I1 flowing from the P terminal 3 to the first O terminal 5 and the second O terminal 6 flows through the wire 31 but does not flow through the wire 32. On the other hand, the current I2 flowing from the first O terminal 5 and the second O terminal 6 to the P terminal 3 flows through the wire 32 but does not flow through the wire 31.

[0068] 11 shows a path of a current I3 flowing from the N terminal 4 to the first O terminal 5 and the second O terminal 6. As shown in FIG. 11, the current I3 flows from the N terminal 4 to the first O terminal 5 and the second O terminal 6 via the wire 82, the conductive layer 22, the wire 72, the second transistor group 210A, the conductive layer 23, the wire 41, the conductive layer 12, and the wires 62 and 63.

[0069] 12 shows a path of a current I4 flowing from the first O terminal 5 and the second O terminal 6 to the N terminal 4. As shown in FIG 12, the current I4 flows from the first O terminal 5 and the second O terminal 6 to the N terminal 4 via the wires 62 and 63, the conductive layer 12, the second diode group 220A, the wires 54 and 55, the conductive layer 14, the wire 42, the conductive layer 22, and the wire 82.

[0070] In this way, the current I3 flowing from the N terminal 4 to the first O terminal 5 and the second O terminal 6 flows through the wire 41 but does not flow through the wire 42. On the other hand, the current I4 flowing from the first O terminal 5 and the second O terminal 6 to the N terminal 4 flows through the wire 42 but does not flow through the wire 41.

[0071] In the semiconductor device 1 according to the first embodiment, the upper arm 100 includes a first transistor 110 and a first diode 120, the first transistor 110 is provided on the first insulating substrate 10, and the first diode 120 is provided on the second insulating substrate 20. Therefore, the wires 31 and 32 through which the current I1 flowing from the P terminal 3 to the first O terminal 5 and the second O terminal 6 and the current I2 flowing from the first O terminal 5 and the second O terminal 6 to the P terminal 3 pass are different. Therefore, the amount of heat generated in the wires 31 and 32 can be reduced compared to the case where the currents flowing between the first insulating substrate 10 and the second insulating substrate 20 pass through the same connecting member.

[0072] Similarly, the lower arm 200 includes a second transistor 210 and a second diode 220, the second transistor 210 is provided on the second insulating substrate 20, and the second diode 220 is provided on the first insulating substrate 10. Therefore, the wires 41 and 42 through which the current I3 flowing from the N terminal 4 to the first O terminal 5 and the second O terminal 6 and the current I4 flowing from the first O terminal 5 and the second O terminal 6 to the N terminal 4 pass are different. Therefore, the amount of heat generated in the wires 41 and 42 can be reduced compared to the case where the currents flowing between the first insulating substrate 10 and the second insulating substrate 20 pass through the same connecting member.

[0073] By reducing the amount of heat generated in this manner, it is possible to suppress the risk of the connection members and wires generating excessive amounts of heat, and to reduce the risk of the wires melting.

[0074] Since wires 31, 32, 41, and 42 are used for connection between first insulating substrate 10 and second insulating substrate 20, first insulating substrate 10 and second insulating substrate 20 can be easily connected. That is, conductive layer 13 can be easily connected to conductive layer 25, conductive layer 12 can be easily connected to conductive layer 24, conductive layer 14 can be easily connected to conductive layer 22, and conductive layer 12 can be easily connected to conductive layer 23. Metal plates such as bus bars may be used instead of wires 31, 32, 41, and 42. In this case, a larger current can be easily passed.

[0075] Since the wire 52 is used to connect the first source electrode 112 and the conductive layer 12, and the wire 74 is used to connect the first anode electrode 121 and the conductive layer 24, it is easy to connect the first source electrode 112 and the conductive layer 12, and it is easy to connect the first anode electrode 121 and the conductive layer 24. Furthermore, since the wire 72 is used to connect the second source electrode 212 and the conductive layer 22, and the wire 54 is used to connect the second anode electrode 221 and the conductive layer 14, it is easy to connect the second source electrode 212 and the conductive layer 22, and it is easy to connect the second anode electrode 221 and the conductive layer 14.

[0076] The multiple first transistors 110 included in the upper arm 100 are arranged adjacent to each other on the first insulating substrate 10. The first source electrode 112 is directly connected to the conductive layer 12. This makes it possible to reduce the inductance of each power loop of the multiple first transistors 110, and to suppress variations in the inductance of the power loop among the multiple first transistors 110. This makes it possible to realize more stable operation of the multiple first transistors 110.

[0077] The multiple second transistors 210 included in the lower arm 200 are arranged adjacent to each other on the second insulating substrate 20. The second source electrode 212 is directly connected to the conductive layer 22. This makes it possible to reduce the inductance of each power loop of the multiple second transistors 210, and to suppress variations in the inductance of the power loop among the multiple second transistors 210. This makes it possible to realize more stable operation of the multiple second transistors 210.

[0078] In plan view, the first transistor 110 is disposed between the first gate terminal 131 and the second diode 220. That is, the first transistor 110 of the upper arm 100 is disposed closer to the first gate terminal 131 than the second diode 220 of the lower arm 200. In addition, a plurality of first transistors 110 can be disposed in the vicinity of the conductive layer 11. Therefore, it is easy to reduce the inductance of the gate loop of the first transistor 110. In addition, in plan view, the second transistor 210 is disposed between the second gate terminal 231 and the first diode 120. That is, the second transistor 210 of the lower arm 200 is disposed closer to the second gate terminal 231 than the first diode 120 of the upper arm 100. In addition, a plurality of second transistors 210 can be disposed in the vicinity of the conductive layer 21. Therefore, it is easy to reduce the inductance of the gate loop of the second transistor 210.

[0079] Furthermore, the first gate electrodes 111 of the multiple first transistors 110 are connected to the first gate terminal 131, and the multiple first transistors 110 are arranged between the first gate terminal 131 and the second diode 220. This makes it easy to reduce the difference in gate loop inductance between the multiple first transistors 110. Also, the second gate electrodes 211 of the multiple second transistors 210 are connected to the second gate terminal 231, and the multiple second transistors 210 are arranged between the second gate terminal 231 and the first diode 120. This makes it easy to reduce the difference in gate loop inductance between the multiple second transistors 210.

[0080] The first transistor 110 and the second transistor 210 may be field effect transistors such as metal-oxide-semiconductor (MOS) field effect transistors made of silicon carbide. The first diode 120 and the second diode 220 may be Schottky barrier diodes made of silicon carbide. By using silicon carbide, an excellent breakdown voltage can be obtained.

[0081] 13, the second main surface 2B of the heat sink 2 is preferably curved in a convex shape. This is because it is easy to achieve good heat transfer efficiency by closely adhering the heat sink 2 to a cooler or the like using a TIM or the like.

[0082] Second embodiment Next, a second embodiment will be described below. Fig. 14 is a schematic diagram showing the configurations of a first insulating substrate and a second insulating substrate in a semiconductor device according to the second embodiment.

[0083] 14, in the semiconductor device according to the second embodiment, the first insulating substrate 10 has a third insulating substrate 10A and a fourth insulating substrate 10B, and the second insulating substrate 20 has a fifth insulating substrate 20A and a sixth insulating substrate 20B. The fourth insulating substrate 10B is disposed on the X1 side of the third insulating substrate 10A, and the sixth insulating substrate 20B is disposed on the X2 side of the fifth insulating substrate 20A.

[0084] The third insulating substrate 10A has conductive layers 11A, 12A, 13A, 14A, and 18A on the Z1 side surface, and a conductive layer (not shown) on the Z2 side surface. The conductive layer provided on the Z2 side surface is joined to the heat sink 2 by a bonding material 7 such as solder, similar to the conductive layer 19. A plurality of first transistors 110, for example, two, are mounted on the conductive layer 13A. The two first transistors 110 are lined up in the X1-X2 direction. A plurality of second diodes 220, for example, four, are mounted on the conductive layer 12A. The four second diodes 220 are lined up in two rows, two by two, in the X1-X2 direction.

[0085] The fourth insulating substrate 10B has conductive layers 11B, 12B, 12C, 13B, 14B, and 18B on the Z1 side surface, and a conductive layer (not shown) on the Z2 side surface. The conductive layer provided on the Z2 side surface is joined to the heat sink 2 by a bonding material 7 such as solder, similar to the conductive layer 19. A plurality of first transistors 110, for example, two, are mounted on the conductive layer 13B. The two first transistors 110 are lined up in the X1-X2 direction. A plurality of second diodes 220, for example, four, are mounted on the conductive layer 12C. The four second diodes 220 are lined up in two rows, two by two, in the X1-X2 direction.

[0086] A wire 411, a wire 412, a wire 413, a wire 414, a wire 415, and a wire 418 are provided. The wire 411 connects the conductive layer 11A to the conductive layer 11B. The wire 412 connects the conductive layer 12A to the conductive layer 12B. The wire 413 connects the conductive layer 13A to the conductive layer 13B. The wire 414 connects the conductive layer 14A to the conductive layer 14B. The wire 415 connects the conductive layer 12A to the conductive layer 12C. The wire 418 connects the conductive layer 18A to the conductive layer 18B.

[0087] Conductive layers 11A and 11B are part of conductive layer 11. Conductive layers 12A, 12B, and 12C are part of conductive layer 12. Conductive layers 13A and 13B are part of conductive layer 13. Conductive layers 14A and 14B are part of conductive layer 14. Conductive layers 18A and 18B are part of conductive layer 18.

[0088] The fifth insulating substrate 20A has conductive layers 21A, 22A, 23A, 24A, 25A, and 28A on the Z1 side surface, and a conductive layer (not shown) on the Z2 side surface. The conductive layer provided on the Z2 side surface is joined to the heat sink 2 by a bonding material 8 such as solder, similar to the conductive layer 29. A plurality of second transistors 210, for example, two, are mounted on the conductive layer 23A. The two second transistors 210 are lined up in the X1-X2 direction. A plurality of first diodes 120, for example, four, are mounted on the conductive layer 25A. The four first diodes 120 are lined up in two rows, two by two, in the X1-X2 direction.

[0089] The sixth insulating substrate 20B has conductive layers 21B, 22B, 23B, 24B, 25B, and 28B on the Z1 side surface, and a conductive layer (not shown) on the Z2 side surface. The conductive layer provided on the Z2 side surface is joined to the heat sink 2 by a bonding material 8 such as solder, similar to the conductive layer 29. A plurality of second transistors 210, for example, two, are mounted on the conductive layer 23B. The two second transistors 210 are lined up in the X1-X2 direction. A plurality of first diodes 120, for example, four, are mounted on the conductive layer 25B. The four first diodes 120 are lined up in two rows, two by two, in the X1-X2 direction.

[0090] A wire 421, a wire 422, a wire 423, a wire 424, a wire 425, and a wire 428 are provided. The wire 421 connects the conductive layer 21A to the conductive layer 21B. The wire 422 connects the conductive layer 22A to the conductive layer 22B. The wire 423 connects the conductive layer 23A to the conductive layer 23B. The wire 424 connects the conductive layer 24A to the conductive layer 24B. The wire 425 connects the conductive layer 25A to the conductive layer 25B. The wire 428 connects the conductive layer 28A to the conductive layer 28B.

[0091] Conductive layers 21A and 21B are part of conductive layer 21. Conductive layers 22A and 22B are part of conductive layer 22. Conductive layers 23A and 23B are part of conductive layer 23. Conductive layers 24A and 24B are part of conductive layer 24. Conductive layers 25A and 25B are part of conductive layer 25. Conductive layers 18A and 18B are part of conductive layer 18.

[0092] The other configuration is similar to that of the first embodiment.

[0093] The second embodiment also provides the same effects as the first embodiment. In the second embodiment, since the first insulating substrate 10 includes the third insulating substrate 10A and the fourth insulating substrate 10B, it is easier to bring the third insulating substrate 10A and the fourth insulating substrate 10B into closer contact with the first main surface 2A of the heat sink 2. Similarly, since the second insulating substrate 20 includes the fifth insulating substrate 20A and the sixth insulating substrate 20B, it is easier to bring the fifth insulating substrate 20A and the sixth insulating substrate 20B into closer contact with the first main surface 2A of the heat sink 2.

[0094] Third embodiment Next, a third embodiment will be described. Fig. 15 is a top view showing a semiconductor device according to the third embodiment. However, in Fig. 15, the case is seen through, as in Fig. 2.

[0095] As shown in FIG. 15, the semiconductor device according to the third embodiment does not have the first diode group 120A, the second diode group 220A, the conductive layers 14 and 24, and the wires 32, 42, 54, 55, 74 and 75.

[0096] The upper arm 100 is composed of a plurality of first transistors 110 (first transistor group 110A), and the lower arm 200 is composed of a plurality of second transistors 210 (second transistor group 210A).

[0097] The other configuration is similar to that of the first embodiment.

[0098] Both the first transistor 110 and the second transistor 210 include a body diode. Therefore, a return current may flow through the body diode. The third embodiment also provides the same effects as the first embodiment.

[0099] (Fourth embodiment) Next, a fourth embodiment will be described. Fig. 16 is a top view showing a semiconductor device according to the fourth embodiment. However, in Fig. 16, the case is seen through, as in Fig. 2.

[0100] In the semiconductor device according to the fourth embodiment, as shown in Fig. 16, the first insulating substrate 10 has conductive layers 11, 12, 13, and 18 on the Z1 side, but does not have a conductive layer 14. As in the first embodiment, a plurality of, for example, four, first transistors 110 are mounted on the conductive layer 13. Be There are.

[0101] The second insulating substrate 20 has conductive layers 22, 24, 25, 26, 27, and 523 on the surface on the Z1 side, and does not have conductive layers 21, 23, and 28. A plurality of third diodes 520, for example, eight third diodes 520, are mounted on the conductive layer 523. The third diodes 520 have a configuration similar to that of the second diode 220, for example. The eight third diodes 520 are arranged in two rows, four in each row, in the X1-X2 direction. The eight third diodes 520 form a third diode group 520A. The eight third diodes 520 are arranged adjacent to each other in a third diode aggregated region 520R that is rectangular in plan view. That is, the eight third diodes 520 are aggregated in the third diode aggregated region 520R. In the fourth embodiment, the third diode 520 is an example of a semiconductor chip and a second diode chip.

[0102] The semiconductor device according to the fourth embodiment does not have wires 42, 71, 72, 73, 81, and 85. A wire 54 connects an anode electrode provided on each of the four third diodes 520 arranged on the Y1 side among the eight third diodes 520 to a conductive layer 22 provided on the second insulating substrate 20. A wire 55 connects an anode electrode provided on each of the four third diodes 520 arranged on the Y1 side among the eight third diodes 520 to an anode electrode provided on each of the four third diodes 520 arranged on the Y2 side.

[0103] The semiconductor device according to the fourth embodiment does not include the second transistor 210, the second diode 220, the second gate terminal 231, and the second sense source terminal 232.

[0104] Here, a description will be given of the circuit configuration of the semiconductor device according to the fourth embodiment. Fig. 17 is a circuit diagram showing the semiconductor device according to the fourth embodiment.

[0105] As shown in FIG. 17, the first drain electrode 113 of the first transistor 110 and the first cathode electrode 122 of the first diode 120 are commonly connected to the P terminal 3, and the first source electrode 112 and the first anode electrode 121 are commonly connected to the first O terminal 5 and the second O terminal 6. That is, the first transistor 110 and the first diode 120 are connected in parallel between the P terminal 3 and the first O terminal 5 and the second O terminal 6. In addition, the cathode electrode of the third diode 520 is connected to the first O terminal 5 and the second O terminal 6, and the anode electrode is connected to the N terminal 4. That is, the third diode 520 is connected between the N terminal 4 and the first O terminal 5 and the second O terminal 6. In the fourth embodiment, the upper arm 100 includes the first transistor 110 (first transistor group 110A) and the first diode 120 (first diode group 120A) as in the first embodiment. On the other hand, the lower arm 200 includes a third diode 520 (third diode group 520A) but does not include a second transistor 210 (second transistor group 210A). As in the first embodiment, the upper arm 100 and the lower arm 200 are connected in series between the P terminal 3 and the N terminal 4.

[0106] While the semiconductor device according to the first to third embodiments can operate as an inverter, the semiconductor device according to the fourth embodiment can function as a converter.

[0107] Like the first embodiment, the fourth embodiment also makes it possible to realize more stable operation of the multiple first transistors 110.

[0108] In the fourth embodiment, the upper arm 100 is configured by connecting the first diode 120 in parallel with the first transistor 110, but the first diode 120 does not have to be included in the upper arm 100. As described above, the first transistor 110 includes a body diode. Therefore, even if the first diode 120 is not provided, a return current may flow through the body diode. Even in this case, the semiconductor device can function as a converter.

[0109] As a modification of the fourth embodiment, the lower arm 200 may include the second transistor 210 and the second diode 220, the upper arm 100 may include a diode, and the upper arm 100 may not include a transistor. Furthermore, the lower arm 200 may include the second transistor 210, the lower arm 200 may not include the second transistor 210, the upper arm 100 may include a diode, and the upper arm 100 may not include a transistor. In these cases as well, the semiconductor device can function as a converter.

[0110] In the present disclosure, the transistor is not limited to a MOS type FET, and the transistor may be an insulated gate bipolar transistor (IGBT). When the transistor is an IGBT, the emitter electrode is an example of the first electrode.

[0111] Although the embodiments have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the claims. [Explanation of symbols]

[0112] 1: Semiconductor device 2: Heat sink 2A: 1st main surface 2B: 2nd main surface 3:P terminal 4:N terminal 5: 1st O terminal 6: 2nd O terminal 7, 8: Bonding material 9: Case 10: First insulating substrate 10A: Third insulating substrate 10B: Fourth insulating substrate 11, 11A, 11B, 12A, 12B, 12C, 13, 13A, 13B, 14, 14A, 14B, 18, 18A, 18B, 19: Conductive layer 12: Conductive layer (first conductive pattern) 20: Second insulating substrate 20A: 5th insulating substrate 20B: Sixth insulating substrate 21, 21A, 21B, 22A, 22B, 23, 23A, 23B, 24, 24A, 24B, 25, 25A, 25B, 26, 27, 28, 28A, 28B, 29: Conductive layer 22: Conductive layer (second conductive pattern) 31, 32: Wire 41, 42: Wire 51, 52, 53, 54, 55: Wire 61, 62, 63, 64, 65: Wire 71, 72, 73, 74, 75: Wire 81, 82, 83, 85, 86, 87: Wire 91, 92: Side wall 93, 94: End wall 95, 96: Terminal block 100: Upper arm 110: First transistor (first transistor chip) 110A: First transistor group 110R: First transistor aggregation region 111: First gate electrode 112: first source electrode 113: first drain electrode 120: First diode (third diode chip) 120A: First diode group 120R: First diode aggregation area 121: first anode electrode 122: first cathode electrode 131: First gate terminal 132: First sense source terminal 133: Sense drain terminal 200: Lower arm 210: second transistor (second transistor chip) 210A: Second transistor group 210R: Second transistor aggregation region 211: second gate electrode 212: second source electrode 213: second drain electrode 220: Second diode (first diode chip) 220A: Second diode group 220R: Second diode aggregation region 221: second anode electrode 222: second cathode electrode 231: Second gate terminal 232: Second sense source terminal 330: Thermistor 331: First thermistor terminal 332: Second thermistor terminal 411, 412, 413, 414, 415, 418: Wire 421, 422, 423, 424, 425, 428: Wire 520: Third diode (second diode chip) 520A: Third diode group 520R: Third diode aggregation area 523: Conductive layer I1, I2, I3, I4: Current

Claims

1. A first insulating substrate; A second insulating substrate; A first arm; A second arm connected to the first arm; a first conductive pattern provided on the first insulating substrate; having the first arm has a plurality of first transistor chips provided on the first insulating substrate, the second arm has a semiconductor chip provided on the second insulating substrate, the first transistor chips are disposed adjacent to one another on the first insulating substrate; First electrodes of the plurality of first transistor chips are directly connected to the first conductive pattern; the first electrode is a source electrode or an emitter electrode, the semiconductor chip includes a second transistor chip; the second arm has a first diode chip connected in parallel to the second transistor chip; The first diode chip is provided on the first insulating substrate.

2. A first insulating substrate; A second insulating substrate; A first arm; A second arm connected to the first arm; a first conductive pattern provided on the first insulating substrate; having the first arm has a plurality of first transistor chips provided on the first insulating substrate, the second arm has a semiconductor chip provided on the second insulating substrate, the first transistor chips are disposed adjacent to one another on the first insulating substrate; First electrodes of the plurality of first transistor chips are directly connected to the first conductive pattern; the first electrode is a source electrode or an emitter electrode, a second conductive pattern provided on the second insulating substrate; the semiconductor chip includes a plurality of second transistor chips; the second transistor chips are disposed adjacent to one another on the second insulating substrate; second electrodes of the second transistor chips are directly connected to the second conductive pattern; the second electrode is a source electrode or an emitter electrode, the second arm has a first diode chip connected in parallel to the second transistor chip; The first diode chip is provided on the first insulating substrate.

3. The semiconductor device according to claim 2 , wherein the second transistor chips are concentrated in a rectangular second region.

4. 4. The semiconductor device according to claim 2, wherein the second transistor chips are arranged side by side in the second direction.

5. The semiconductor device according to claim 2 , wherein the semiconductor chip includes a second transistor chip.

6. 6. The semiconductor device according to claim 1, wherein the first diode chip is a Schottky barrier diode made of silicon carbide.

7. 7. The semiconductor device according to claim 1, wherein the second transistor chip is a field effect transistor made of silicon carbide.

8. a second control terminal connected to a second control electrode of the second transistor chip; The semiconductor device according to claim 1 , wherein the second control terminal is disposed closer to the second insulating substrate than to the first insulating substrate.

9. the first arm has a third diode chip connected in parallel to the first transistor chip; The semiconductor device according to claim 1 , wherein the third diode chip is provided on the second insulating substrate.

10. A first insulating substrate; A second insulating substrate; A first arm; A second arm connected to the first arm; a first conductive pattern provided on the first insulating substrate; having the first arm has a plurality of first transistor chips provided on the first insulating substrate, the second arm has a semiconductor chip provided on the second insulating substrate, the first transistor chips are disposed adjacent to one another on the first insulating substrate; First electrodes of the plurality of first transistor chips are directly connected to the first conductive pattern; the first electrode is a source electrode or an emitter electrode, the first arm has a third diode chip connected in parallel to the first transistor chip; The third diode chip is provided on the second insulating substrate.

11. 11. The semiconductor device according to claim 9, wherein the third diode chip is a Schottky barrier diode made of silicon carbide.

12. The semiconductor device according to claim 1 , wherein the first transistor chips are concentrated in a rectangular first region.

13. The semiconductor device according to claim 1 , wherein the first transistor chips are arranged side by side in a first direction.

14. The semiconductor device according to claim 1 , wherein the semiconductor chip includes a second diode chip.

15. The semiconductor device according to claim 14 , wherein the second diode chip is a Schottky barrier diode made of silicon carbide.

16. a first control terminal connected to first control electrodes of the plurality of first transistor chips; The semiconductor device according to claim 1 , wherein the first control terminal is disposed closer to the first insulating substrate than to the second insulating substrate.

17. The semiconductor device according to claim 1 , wherein the first transistor chip is a field effect transistor made of silicon carbide.

18. a heat sink having a first main surface and a second main surface opposite to the first main surface; The semiconductor device according to claim 1 , wherein the first insulating substrate and the second insulating substrate are mounted on the first main surface.

19. The semiconductor device according to claim 18 , wherein the second main surface is convexly curved.

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