Semiconductor Device

Abstract

The purpose of the present invention is to suppress the occurrence of wire breakage.　A wiring portion (63) includes a vertical portion (64), a parallel portion (65), and an inclined portion (66). A lower end portion of the vertical portion (64) is connected to a chip bonding portion (61), and an upper end portion of the vertical portion (64) rises vertically upward relative to the chip bonding portion (61). The parallel portion (65) is connected to the upper end portion of the vertical portion (64) and is formed parallel with wiring boards (43b, 43d) and a semiconductor chip (50c) from said upper end portion. The inclined portion (66) is inclined from the parallel portion (65) toward a wiring bonding portion (62). Even when a wire (71b) is bonded to an obverse surface of the parallel portion (65) of the wiring portion (63) included in such a lead frame (60), the occurrence of deformation of the parallel portion (65) toward an insulated-circuit-board (40) side is suppressed.

Description

[Technical field]

[0001] The present invention relates to a semiconductor device. [Background technology]

[0002] The semiconductor device includes a power device. Such a semiconductor device has, for example, a power conversion function. The power device is, for example, a semiconductor chip including an IGBT (Insulated Gate Bipolar Transistor) and a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor).

[0003] The semiconductor device further includes a circuit board on which the semiconductor chip is disposed and connection wiring (e.g., a lead frame) that electrically connects the semiconductor chip and the circuit board, and is sealed with a sealing member. The connection wiring connects a main electrode on the front surface of the semiconductor chip to a wiring board included in the circuit board (see, for example, Patent Documents 1 to 4). The semiconductor device may further include a shunt resistor. The shunt resistor may also be directly connected to the wiring board of the circuit board by a connection wiring (see, for example, Patent Documents 5 and 6). The semiconductor device may also include a lead frame on which the semiconductor chip is disposed, instead of the circuit board (Patent Documents 7 to 9). The semiconductor device may include a wire for source sensing. Such a wire may be joined to the connection wiring (see, for example, Patent Documents 3 and 4). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2015 / 059882 [Patent Document 2] JP 2003-332393 A [Patent Document 3] JP 2016-004796 A [Patent Document 4] JP 2019-071399 A [Patent Document 5] JP 2019-075521 A [Patent Document 6] JP 2019-075959 A [Patent Document 7] International Publication No. 2015 / 151273 [Patent Document 8] JP 2013-243394 A [Patent Document 9] Japanese Unexamined Patent Publication No. 61-137352 Summary of the Invention [Problem to be solved by the invention]

[0005] The sealing member of a semiconductor device has low adhesion depending on the components to be sealed. For example, the sealing member has low adhesion to the solder that joins the connection wiring to the circuit board. If there is a part of the sealing member with low adhesion, peeling occurs at that part, and the peeling propagates from the peeling. If the extension of such peeling leads to a wire for source sensing joined to the connection wiring, the wire may be cut by the peeling.

[0006] The present invention has been made in view of the above-mentioned circumstances, and has an object to provide a semiconductor device in which the occurrence of wire breakage is suppressed. [Means for solving the problem]

[0007] According to one aspect of the present invention, there is provided a semiconductor device including a first conductive portion and a second conductive portion arranged with a gap therebetween, a first bonding portion joined to a first front surface of the first conductive portion, a second bonding portion joined to a second front surface of the second conductive portion, and a connection wiring including a wiring portion connecting the first bonding portion and the second bonding portion across the gap, wherein the wiring portion includes a vertical portion whose lower end is connected to the first bonding portion and whose upper end rises vertically upward relative to the first bonding portion, a parallel portion extending from the upper end of the vertical portion in parallel to the first conductive portion and the second conductive portion, and an inclined portion inclined from the parallel portion toward the second bonding portion. Effect of the Invention

[0008] According to the disclosed technology, the occurrence of wire breakage is suppressed, and a decrease in reliability is prevented.

[0009] The above and other objects, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings illustrating preferred embodiments of the present invention. [Brief description of the drawings]

[0010] [Figure 1] 1 is a plan view of a semiconductor device according to an embodiment; [Diagram 2] 2 is a plan view of a storage area of ​​a case included in the semiconductor device according to the embodiment; [Diagram 3] 1 is a plan view of a semiconductor unit included in a semiconductor device according to an embodiment; [Figure 4] 2 is a plan view of an insulating circuit board of a semiconductor unit included in the semiconductor device according to the embodiment; [Diagram 5] 1 is a cross-sectional view of a semiconductor unit included in a semiconductor device according to an embodiment; [Figure 6] 2 is a cross-sectional view of a lead frame included in the semiconductor device of the embodiment; [Figure 7] 2 is a plan view of a lead frame included in the semiconductor device according to the embodiment; [Figure 8] 1 is a cross-sectional view (before wire bonding) of a lead frame included in a semiconductor device of a reference example. [Figure 9] 1 is a cross-sectional view of a lead frame included in a semiconductor device of a reference example (after wire bonding). [Figure 10] 1 is a cross-sectional view of a lead frame included in a semiconductor device according to an embodiment (variation 1). [Figure 11] FIG. 2 is a plan view of a lead frame included in a semiconductor device according to the embodiment (variation 1). [Figure 12] FIG. 11 is a cross-sectional view of a lead frame included in a semiconductor device according to an embodiment (modification 2). [Figure 13] FIG. 11 is a plan view of a lead frame included in a semiconductor device according to the embodiment (modification 2). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, the embodiment will be described with reference to the drawings. In the following description, the terms "front surface" and "upper surface" refer to the XY surface facing upward (+Z direction) in the semiconductor device 10 of the figure. Similarly, "upper" refers to the upward (+Z direction) direction in the semiconductor device 10 of FIG. 1. The terms "rear surface" and "lower surface" refer to the XY surface facing downward (-Z direction) in the semiconductor device 10 of the figure. Similarly, "lower" refers to the downward (-Z direction) direction in the semiconductor device 10 of FIG. 1. The same directionality is used in other figures as necessary. "High position" refers to the position of the upper side (+Z side) in the semiconductor device 10 of the figure. Similarly, "lower position" refers to the position of the lower side (-Z side) in the semiconductor device 10 of the figure. The terms "front surface", "upper surface", "upper", "rear surface", "lower surface", "lower", and "side surface" are merely convenient expressions for specifying relative positional relationships and do not limit the technical idea of ​​the present invention. For example, "up" and "down" do not necessarily mean a vertical direction relative to the ground. In other words, the directions of "up" and "down" are not limited to the direction of gravity. In addition, in the following description, "main component" refers to a component that contains 80 vol% or more.

[0012] The semiconductor device of the embodiment will be described with reference to Figs. 1 and 2. Fig. 1 is a plan view of the semiconductor device of the embodiment, and Fig. 2 is a plan view of a storage area of ​​a case included in the semiconductor device of the embodiment. Fig. 2 illustrates a plan view of terminal stack 25b (first power terminal 22b, insulating sheet 23b, second power terminal 24b) of semiconductor device 10. Storage area 21e2 of main body 21 is indicated by a dashed line. Fig. 2 only illustrates storage area 21e2 and terminal stack 25b, and storage areas 21e1, 21e3 and terminal stack 25a, 25c can be similarly illustrated.

[0013] The semiconductor device 10 has a semiconductor unit (not shown), a heat dissipating base plate (not shown) on which the semiconductor unit is arranged, and a case 20 arranged on the heat dissipating base plate and housing the semiconductor unit. The semiconductor unit and the heat dissipating base plate will be described in detail later. The case 20 includes a main body 21, terminal stacking portions 25a to 25c, a U-terminal 27a, a V-terminal 27b, a W-terminal 27c, and a control terminal (not shown here; see FIG. 3).

[0014] The main body 21 has a generally rectangular shape in a plan view, and is surrounded on all four sides by first to fourth side portions 21a to 21d in that order. The first side portion 21a and the third side portion 21c correspond to the long sides, and the second side portion 21b and the fourth side portion 21d correspond to the short sides. Note that the main body 21 shown in FIG. 1 has fastening holes formed in a corner formed by the first side portion 21a and the second side portion 21b and a corner formed by the third side portion 21c and the fourth side portion 21d.

[0015] The main body 21 includes storage areas 21e1-21e3 and control frame portions 26a-26c. The storage areas 21e1-21e3 are partitioned by the control frame portions 26a and 26b. The storage areas 21e1-21e3 are spaces partitioned by the control frame portions 26a and 26b in the middle of the main body 21 in a plan view, and are provided along the longitudinal direction (first and third side portions 21a and 21c) of the main body 21. The fourth side portion 21d of the storage area 21e3 may include the control frame portion 26c. The storage areas 21e1-21e3 each store a semiconductor unit. The storage areas 21e1-21e3 may have a shape and size that allows the semiconductor unit to be stored in a plan view. The shape may be, for example, rectangular. When the semiconductor units are stored in the storage regions 21e1-21e3, the insides are sealed with a sealing resin as shown in FIG. 1 (see sealing member 29 in FIG. 5). The sealing member contains a thermosetting resin and a filler contained in the thermosetting resin. The thermosetting resin is, for example, an epoxy resin, a phenolic resin, or a maleimide resin. The filler is silicon oxide, aluminum oxide, boron nitride, or aluminum nitride.

[0016] The main body 21 includes terminal stacking portions 25a-25c along the first side portion 21a. The terminal stacking portions 25a-25c are exposed from the first side portion 21a. The main body 21 includes a U terminal 27a, a V terminal 27b, and a W terminal 27c along the third side portion 21c. The U terminal 27a, the V terminal 27b, and the W terminal 27c are exposed from the front surface of the third side portion 21c. The control terminals are provided in the control frame portions 26a-26c, respectively.

[0017] Such main body 21 and control frame parts 26a-26c are molded using a thermoplastic resin. The thermoplastic resin is, for example, polyphenylene sulfide (PPS) resin, polybutylene terephthalate (PBT) resin, polybutylene succinate (PBS) resin, polyamide (PA) resin, or acrylonitrile butadiene styrene (ABS) resin. The main body 21 is molded by insert molding using such a material, including the terminal stack parts 25a-25c, the U terminal 27a, the V terminal 27b, and the W terminal 27c. The control frame parts 26a-26c are molded by insert molding, including the control terminals. The control frame parts 26a-26c may be attached to the main body 21 separately.

[0018] The terminal laminated portions 25a to 25c include first power terminals 22a to 22c, insulating sheets 23a to 23c, and second power terminals 24a to 24c laminated together.

[0019] One end of the front surface of the first power terminals 22a to 22c is exposed in the terminal areas 21a1 to 21a3 of the first side 21a of the main body 21 along the longitudinal direction (first side 21a). Here, one end of the first power terminals 22a to 22c protrudes outward (in the -Y direction) from the first side 21a. The other end of the first power terminals 22a to 22c is electrically connected to a portion corresponding to an N-terminal of a semiconductor chip included in a semiconductor unit inside the main body 21 (storage areas 21e1 to 21e3). The first power terminals 22a to 22c are flat. The first power terminals 22a to 22c are made of a metal having excellent electrical conductivity. Such a metal is, for example, copper, a copper alloy, aluminum, or an aluminum alloy.

[0020] One end of the front surface of the second power terminals 24a to 24c protrudes outward (in the -Y direction) from the first side portion 21a. The second power terminals 24a to 24c are exposed on the first side portion 21a of the main body 21 along the longitudinal direction (first side portion 21a). In this case, one end of the second power terminals 24a to 24c is exposed and arranged. Note that the tip portions (terrace portions 28a, 28b, 28c) of the insulating sheets 23a to 23c are located between the tip portions of the first power terminals 22a to 22c and the tip portions of the second power terminals 24a to 24c in a plan view. This maintains the insulation between the first power terminals 22a to 22c and the second power terminals 24a to 24c. The other ends of the second power terminals 24a to 24c are electrically connected to locations inside the main body 21 (storage areas 21e1 to 21e3) that correspond to P terminals of semiconductor chips included in the semiconductor units. The second power terminals 24a to 24c are flat-plate shaped. The second power terminals 24a to 24c are made of a metal with excellent electrical conductivity. Such metals are, for example, copper, copper alloy, aluminum, and aluminum alloy.

[0021] The insulating sheets 23a to 23c are made of an insulating material having insulating properties, such as insulating paper made of wholly aromatic polyamide polymer, or a sheet-like material made of a fluorine-based or polyimide-based resin material.

[0022] The control terminals included in the control frame portions 26a to 26c are included by insert molding along the control frame portions 26a to 26c. For example, as shown in FIG. 3 described later, the control terminals 26b1 to 26b4 included in the control frame portion 26b are J-shaped in side view (Y-direction arrow view). One end of the control terminals 26b1 to 26b4 extends vertically upward (+Z direction) from the front surface of the control frame portion 26b. The other end of the control terminals 26b1 to 26b4 is exposed on the storage area 21e2 side of the control frame portion 26b. The control terminals 26b1 to 26b4 are directly connected to the control electrodes of the semiconductor chips included in the semiconductor unit in the storage area 21e2 by wiring members, respectively. The control terminals included in the control frame portions 26a and 26c (not shown) are also connected to the control electrodes of the semiconductor chips included in the semiconductor unit in the storage areas 21e1 and 21e3 by wiring members, respectively, in the same manner as the control frame portion 26b. The wiring members are, for example, wires 70a, 70b, 71a, 71b, 71c, 71d, 72a, and 72b. Alternatively, the wiring members may be lead frames. The wiring members are made of a material having excellent electrical conductivity. Such a material is a metal (e.g., aluminum, copper) or an alloy containing at least one of these. Such a control terminal is also made of a metal having excellent electrical conductivity. Such a metal is, for example, copper, a copper alloy, aluminum, or an aluminum alloy.

[0023] The other ends of the U terminal 27a, the V terminal 27b, and the W terminal 27c are electrically connected to the source electrodes (or emitter electrodes) of the semiconductor chips of the semiconductor units in the storage areas 21e1 to 21e3, respectively. Note that FIG. 2 illustrates the case of the V terminal 27b. The other ends of the U terminal 27a and the W terminal 27c are also similarly provided for the storage areas 21e1 and 21e3. One ends of the U terminal 27a, the V terminal 27b, and the W terminal 27c are exposed on the third side 21c of the main body 21 along the longitudinal direction (third side 21c) of the main body 21, respectively. The other ends of the second power terminals 24a to 24c are electrically connected to the locations corresponding to the P terminals of the semiconductor chips included in the semiconductor units inside the main body 21 (storage areas 21e1 to 21e3). The U terminal 27a, the V terminal 27b, and the W terminal 27c are made of metal with excellent conductivity. Such metals are, for example, copper, copper alloys, aluminum, and aluminum alloys.

[0024] Next, the semiconductor unit arranged on the heat dissipating base plate will be described with reference to Figs. 3 to 5. Fig. 3 is a plan view of the semiconductor unit included in the semiconductor device of the embodiment. Fig. 4 is a plan view of an insulating circuit board of the semiconductor unit included in the semiconductor device of the embodiment. Fig. 5 is a cross-sectional view of the semiconductor unit included in the semiconductor device of the embodiment. Note that Fig. 4 shows only the insulating circuit board shown in Fig. 3. Fig. 5 is a cross-sectional view taken along dashed line YY in Fig. 3.

[0025] 5, the semiconductor unit 30 is disposed on the heat dissipating base plate 45 via a bonding member (not shown). The case 20 is disposed on the heat dissipating base plate 45 via an adhesive. At this time, the semiconductor units 30 are housed in the housing regions 21e1-21e3 of the case 20. Such a semiconductor unit 30 includes an insulating circuit board 40, semiconductor chips 50a-50d, and lead frames 60a-60d.

[0026] The joining member for joining the heat dissipating base plate 45 and the semiconductor unit 30 (insulating circuit board 40) is solder or a sintered material. The solder is lead-free solder or lead-containing solder. Lead-free solder is mainly composed of an alloy containing at least two of tin, silver, copper, zinc, antimony, indium, and bismuth. The solder may further contain additives. The additives are, for example, nickel, germanium, cobalt, or silicon. The solder containing additives improves wettability, gloss, and bonding strength, and can improve reliability. Lead-containing solder further contains lead. The sintered material is, for example, a metal material containing at least one of copper, copper alloy, nickel, nickel alloy, silver, and silver alloy.

[0027] Insulated circuit board 40 has a rectangular shape in a plan view. Insulated circuit board 40 has insulating plate 41, metal plate 42 formed on the back surface of insulating plate 41, and multiple wiring boards 43a-43g formed on the front surface of insulating plate 41. The outer shape of multiple wiring boards 43a-43g and metal plate 42 is smaller than the outer shape of insulating plate 41 in a plan view, and is formed inside insulating plate 41. Note that the shape, number, and size of multiple wiring boards 43a-43g in this embodiment are just an example. Also, multiple wiring boards 43a-43g are a specific example of a conductive part.

[0028] The insulating plate 41 has a rectangular shape in a plan view. The insulating plate 41 may have chamfered corners. For example, the corners may be chamfered in a C-shape or an R-shape. The insulating plate 41 is surrounded on all four sides by a long side 41a, a short side 41b, a long side 41c, and a short side 41d, which are the outer periphery. The insulating plate 41 includes corners 41e to 41h. The corner 41e is formed by the long side 41a and the short side 41b. The corner 41f is formed by the short side 41b and the long side 41c. The corner 41g is formed by the long side 41c and the short side 41d. The corner 41h is formed by the short side 41d and the long side 41a. The insulating plate 41 is made of ceramics having good thermal conductivity. The ceramics is made of a material mainly composed of, for example, aluminum oxide, aluminum nitride, or silicon nitride. The insulating plate 41 has a thickness of, for example, 0.2 mm or more and 2.0 mm or less.

[0029] The metal plate 42 has a rectangular shape in a plan view. The corners may be, for example, C-chamfered or R-chamfered. The metal plate 42 is smaller than the size of the insulating plate 41, and is formed on the entire back surface of the insulating plate 41 except for the edge portions. The metal plate 42 is mainly composed of a metal having excellent thermal conductivity. The metal is, for example, copper, aluminum, or an alloy containing at least one of these. The thickness of the metal plate 42 is, for example, 0.1 mm or more and 2.0 mm or less. In order to improve the corrosion resistance of the metal plate 42, a plating process may be performed. In this case, the plating material used is, for example, nickel, a nickel-phosphorus alloy, or a nickel-boron alloy.

[0030] The wiring boards 43a to 43h are formed over the entire surface of the insulating plate 41 except for the edge portion. Preferably, in a plan view, the ends of the wiring boards 43a to 43g facing the outer periphery of the insulating plate 41 overlap with the end of the metal plate 42 on the outer periphery side of the insulating plate 41. Therefore, the insulating circuit board 40 maintains a stress balance with the metal plate 42 on the back surface of the insulating plate 41. Damage such as excessive warping and cracking of the insulating plate 41 is suppressed. The two broken line areas shown above the wiring boards 43a and 43b (in the +Y direction) respectively represent the chip regions 50a1 and 50c1 of the two semiconductor chips 50a and 50c. The broken line areas shown below the wiring boards 43c and 43d (in the -Y direction) respectively represent the chip regions 50b1 and 50d1 of the two semiconductor chips 50b and 50d. The thickness of the wiring boards 43a-43h is, for example, 0.1 mm or more and 2.0 mm or less. The wiring boards 43a-43h are made of a metal with excellent conductivity. Such a metal is, for example, copper, aluminum, or an alloy containing at least one of these. The surfaces of the wiring boards 43a-43h may be plated to improve corrosion resistance. In this case, the plating material used is, for example, nickel, a nickel-phosphorus alloy, or a nickel-boron alloy.

[0031] Wiring board 43a is formed on the long side 41a of insulating plate 41, along long side 41a, from short side 41b to short side 41d. A recess is formed on the long side 41c side of wiring board 43a on the lower side (-Y direction). Wiring board 43b is substantially symmetrical with wiring board 43a about the center line in the ±Y direction. Wiring board 43b is formed on the long side 41c of insulating plate 41, along long side 41c, from short side 41b to short side 41d. A recess is formed on the long side 41a side of wiring board 43b on the lower side (-Y direction).

[0032] Wiring board 43c is adjacent to wiring board 43a, is parallel to long side 41a, and extends from short side 41b in the -Y direction. The end of wiring board 43c in the -Y direction is separated from short side 41d. The side of the upper part (+Y direction) of wiring board 43c on the side of long side 41c is recessed midway. Wiring board 43d is almost linearly symmetrical with wiring board 43c about the center line in the ±Y direction. Wiring board 43d is adjacent to the upper part (+Y direction) of wiring board 43b, is parallel to long side 41c, and extends from short side 41b in the -Y direction. The end of wiring board 43d in the -Y direction is separated from short side 41d. The side of the upper part (+Y direction) of wiring board 43d on the side of long side 41a is recessed midway.

[0033] Wiring board 43e is disposed in a region surrounded by the lower part (-Y direction) of wiring board 43a, the lower part (-Y direction) of wiring board 43c, short side 41d, and wiring board 43c. That is, wiring board 43e is substantially L-shaped. Wiring board 43f is substantially linearly symmetrical with respect to the center line in the ±Y directions with respect to wiring board 43e. Wiring board 43f is disposed in a region surrounded by the lower part (-Y direction) of wiring board 43b, wiring board 43d, short side 41d, and wiring board 43d. That is, wiring board 43e is substantially L-shaped.

[0034] Wiring board 43g is I-shaped in plan view and is disposed on the wiring board 43c side in an area surrounded by the recesses of wiring boards 43c and 43d, parallel to long side 41a. Wiring board 43h is L-shaped in plan view and is disposed on the wiring board 43d side in an area surrounded by the recesses of wiring boards 43c and 43d, parallel to long side 41c. Wiring board 43h is disposed so as to surround the long side 41c side and short side 41d side of wiring board 43g. Wiring board 43i is I-shaped in plan view and is disposed between wiring boards 43c and 43d, parallel to long sides 41a and 41c.

[0035] Also, the joints of the second power terminals 24a to 24c are respectively joined to the lower end portions (-Y direction) of the wiring boards 43a and 43b of the insulating circuit board 40. Note that FIG. 3 illustrates a case where the internal joints 24b1 and 24b2 of the second power terminal 24b are respectively joined to the wiring boards 43a and 43b. Note that FIG. 3 illustrates a case where the internal joints 22b1 and 22b2 of the first power terminal 22b are respectively joined to the wiring boards 43c and 43d. Note that FIG. 3 illustrates a case where the internal joints 22b1 and 22b2 of the first power terminal 22b are respectively joined to the wiring boards 43c and 43d. Note that the joints of the U terminal 27a, the V terminal 27b, and the W terminal 27c are respectively joined to the upper end portions (+Y direction) of the wiring boards 43c and 43d of the insulating circuit board 40. FIG. 3 illustrates a case in which internal connection portions 27b1 and 27b2 of V terminal 27b are joined to wiring boards 43c and 43d, respectively.

[0036] For example, a DCB (Direct Copper Bonding) board or an AMB (Active Metal Brazed) board may be used as the insulating circuit board 40 having such a configuration. The insulating circuit board 40 dissipates heat generated in the semiconductor chips 50a-50d (described later) by conducting it to the back side of the insulating circuit board 40 via the wiring boards 43a-43d, the insulating plate 41, and the metal plate 42.

[0037] The semiconductor chips 50a-50d are power devices made of silicon carbide. An example of such a power device is a power MOSFET. Each of the semiconductor chips 50a-50d has a drain electrode as an input electrode (main electrode) on the back surface, and a gate electrode as a control electrode 51a-51d and a source electrode as an output electrode 52a-52d (main electrode) on the front surface. The output electrodes 52a-52d are a specific example of a conductive portion.

[0038] The semiconductor chips 50a to 50d may be power devices made of silicon. In this case, the power devices are, for example, RC (Reverse Conducting)-IGBTs. The RC-IGBTs are configured with an IGBT, which is a switching element, and an FWD (Free Wheeling Diode), which is a diode element, in one chip. Each of the semiconductor chips 50a to 50d has, for example, a collector electrode as an input electrode (main electrode) on the back surface, a gate electrode as a control electrode, and an emitter electrode as an output electrode (main electrode) on the front surface.

[0039] In this embodiment, a plurality of semiconductor chips 50a-50d are arranged on wiring boards 43a-43d via the above-mentioned bonding members (see bonding member 46 in FIG. 6). FIG. 3 shows a case where two of each are arranged. In this case, semiconductor chips 50a-50d are arranged such that control electrodes 51a-51d face each other.

[0040] Lead frames 60a-60d electrically connect output electrodes on the front surfaces of semiconductor chips 50a-50d to wiring boards 43a-43f. Lead frame 60a electrically and mechanically connects semiconductor chip 50a to wiring board 43c. Lead frame 60b electrically and mechanically connects semiconductor chip 50b to wiring board 43e. Lead frame 60c electrically and mechanically connects semiconductor chip 50c to wiring board 43d. Lead frame 60d electrically and mechanically connects semiconductor chip 50d to wiring board 43f.

[0041] One end of the lead frames 60a to 60d is joined to the output electrodes of the semiconductor chips 50a to 50d by the solder as described above as the joining member 46. The other end of the lead frames 60a to 60d is joined to the wiring boards 43c, 43e, 43d, and 43f by using the joining member 46 as described above. Such lead frames 60a to 60d are made of a material with excellent conductivity. Such a material is, for example, copper, aluminum, or an alloy containing at least one of these. Furthermore, the surfaces of the lead frames 60a to 60d may be plated to improve corrosion resistance. In this case, the plating material is, for example, nickel, a nickel-phosphorus alloy, or a nickel-boron alloy. When no particular distinction is made between the lead frames 60a to 60d, they will be described as the lead frame 60. Details of the lead frame 60 will be described later.

[0042] In addition, the control electrodes 51a-51d of the semiconductor chips 50a-50d are electrically connected to the control terminals included in the control frame portions 26a-26c by wires. For example, as shown in Fig. 3, the control electrode 51a of the semiconductor chip 50a is electrically connected to the control terminal 26b1 via a wire 70a relayed to the wiring board 43g. The control electrodes 51b and 51d of the semiconductor chips 50b and 50d are electrically connected to the control terminal 26b3 via a wire 70b. The control electrode 51c of the semiconductor chip 50c is electrically connected to the control terminal 26b1 via the wire 70a.

[0043] Moreover, the lead frames 60a and 60c are electrically and mechanically connected to the wiring board 43h via the wires 71a and 71b. Furthermore, the wiring board 43h is electrically and mechanically connected to the control terminal 26b2 via the wire 72a. That is, the lead frames 60a and 60c are electrically connected to the control terminal 26b2. The lead frames 60b and 60d are electrically and mechanically connected to the wiring board 43g via the wires 71c and 71d. Furthermore, the wiring board 43g is electrically and mechanically connected to the control terminal 26b4 via the wire 72b. That is, the lead frames 60b and 60d are electrically connected to the control terminal 26b4. The control terminals 26b2 and 26b4 are used for source sensing.

[0044] The wires 70a, 70b, 71a, 71b, 71c, 71d, 72a, and 72b described above are mainly made of a material with excellent electrical conductivity. Such a material is, for example, gold, copper, aluminum, or an alloy containing at least one of these. Preferably, the wires 70a, 70b, 71a, 71b, 71c, 71d, 72a, and 72b may be an aluminum alloy containing a small amount of silicon. The diameter of the wires 70a, 70b, 71a, 71b, 71c, 71d, 72a, and 72b is, for example, 100 μm or more and 400 μm or less.

[0045] Next, the lead frames 60a to 60d will be described in detail with reference to Fig. 6 and Fig. 7. Fig. 6 is a cross-sectional view of a lead frame included in the semiconductor device of the embodiment, and Fig. 7 is a plan view of a lead frame included in the semiconductor device of the embodiment. Note that Figs. 6 and 7 correspond to the lead frame 60c in Fig. 3. However, since the other lead frames have the same configuration, they are referred to as lead frame 60 here.

[0046] The lead frame 60 is a specific example of the connection wiring. The lead frame 60 includes a chip joint 61, a wiring joint 62, and a wiring portion 63. The chip joint 61 is joined to the output electrode 52c on the front surface of the semiconductor chip 50c via a joining member 46. The joining member 46 may be solder in this case as described above. The wiring joint 62 is joined to the front surface of the wiring board 43d. The wiring joint 62 is joined to the wiring board 43d by the joining member 46 described above. Alternatively, it is joined by ultrasonic bonding. The wiring portion 63 connects the chip joint 61 and the wiring joint 62 across the gap G between the wiring boards 43d and 43b. Such a lead frame 60 is generally flat, and the chip joint 61, the wiring joint 62, and the wiring portion 63 are integrally connected. The thickness of the lead frame 60 is generally uniform and may be, for example, 0.2 mm or more and 0.6 mm or less, and preferably 0.3 mm or more and 0.5 mm or less. The shape of the chip bonding portion 61 in a plan view is rectangular, similar to the shape of the output electrode 52c of the semiconductor chip 50c in a plan view. The area of ​​the chip bonding portion 61 in a plan view may be 60% or more and 95% or less of the area of ​​the output electrode 52c of the semiconductor chip 50c in a plan view.

[0047] The wiring portion 63 further includes a vertical portion 64, a parallel portion 65, and an inclined portion 66. The lower end of the vertical portion 64 is connected to the chip joint portion 61, and the upper end of the vertical portion 64 rises vertically upward from the chip joint portion 61. Therefore, the angle R between the vertical portion 64 and the chip joint portion 61 is approximately 90 degrees. The angle R may be substantially 90 degrees. Although the angle R is preferably 90 degrees, it may be 80 degrees or more and less than 90 degrees. In this embodiment, the angle R is described as 90 degrees unless otherwise specified. The outer side (wiring board 43b side) of the connection portion (heel portion 61b) between the lower end of the vertical portion 64 and the chip joint portion 61 may form an R surface. Alternatively, it may be C-chamfered. Therefore, the joining member 46 joining the chip joining portion 61 and the semiconductor chip 50c forms a fillet at the toe portion 61a (+X direction) of the chip joining portion 61. The joining member 46 also forms a fillet at the heel portion 61b (-X direction) of the chip joining portion 61, covering the outside of the connection portion with the vertical portion 64. Note that the side portions of the chip joining portion 61 perpendicular to the toe portion 61a and heel portion 61b also form a fillet.

[0048] The parallel portion 65 is connected to the upper end of the vertical portion 64, and extends from the upper end in parallel to the wiring boards 43b, 43d and the semiconductor chip 50c. Since the wiring portion 63 spans the gap G, the parallel portion 65 extends from the upper end of the vertical portion 64 toward the wiring joint portion 62. In this case, too, the outside of the connection point P2 between the parallel portion 65 and the vertical portion 64 may form an R surface. Alternatively, it may be C-chamfered. The angle between the parallel portion 65 and the vertical portion 64 is approximately 90 degrees. This angle may also be substantially 90 degrees.

[0049] Moreover, one end (wire joint 71b1) of wire 71b is joined to the front surface of parallel portion 65. The other end of wire 71b is joined to wiring board 43h (adjacent to wiring board 43d in the -X direction). As described above, wire 71b is joined to parallel portion 65 by a bonding device. In the bonding device, ultrasonic waves are applied while pressing one end of wire 71b against parallel portion 65. At this time, wire joint 71b1, which is a plastically deformed one end of wire 71b, is joined to parallel portion 65. Wire joint 71b1 extends in any direction according to the vibration direction of the ultrasonic waves. In this embodiment, wire joint 71b1 extends in the wiring direction (±X direction) of wiring portion 63 and has an elliptical shape in a plan view. In this embodiment, wire 71b is wired in a straight line with respect to the major axis of wire joint 71b1.

[0050] The inclined portion 66 is inclined from the parallel portion 65 toward the wiring joint 62. The inclination angle of the inclined portion 66 with respect to the wiring joint 62 is an angle α. The outside (upper side) of the connection point P3 between the inclined portion 66 and the parallel portion 65 may be an R-surface. Alternatively, it may be C-chamfered. The outside (wiring board 43d side) of the connection point P1 (heel portion 62b) between the inclined portion 66 and the wiring joint 62 may be an R-surface. Alternatively, it may be C-chamfered. Therefore, the joining member 46 joining the wiring joint 62 and the wiring board 43d forms a fillet shape at the toe portion 62a (-X direction) of the wiring joint 62. The joining member 46 also forms a fillet shape by covering the outside (wiring board 43d side) of the connection point P1 with the inclined portion 66 at the heel portion 62b (+X direction) of the wiring joint 62.

[0051] In the wiring portion 63 of the lead frame 60, the length between the connection points P1 and P2 is defined as length L. That is, the length L is the distance in the ±X direction between the heel portion 61b of the chip bonding portion 61 and the heel portion 62b of the wiring bonding portion 62. Of the length L, the length between the connection points P2 and P3 is defined as length L1. That is, the length L1 is the length of the parallel portion 65 in the ±X direction along the wiring direction of the lead frame 60. Of the length L, the length in a plan view between the connection points P3 and P1 is defined as length L2. That is, the length L2 is the length of the inclined portion 66 in the ±X direction along the wiring direction of the lead frame 60 in a plan view. The actual length of the inclined portion 66 along the wiring direction of the lead frame 60 is expressed as length L2 / COSα.

[0052] Furthermore, the width of the wiring portion 63 in a planar view (the width in a direction (±Y direction) perpendicular to the wiring direction (±X direction) of the lead frame 60) may be approximately uniform overall. The width of the wiring portion 63 may be smaller than the width of the chip bonding portion 61 and the wiring bonding portion 62. Furthermore, the width of the wiring portion 63 may be narrow in part. For stability of the wiring portion 63, it is preferable that the width of the wiring portion 63 is approximately uniform overall. For further stability, it is more preferable that the width of the lead frame 60 is approximately uniform overall.

[0053] Also, the wiring portion 63 may have different angles α. When the angle α is increased, the length L2 is shortened and the length L1 is increased. On the other hand, when the angle α is decreased, the length L2 is increased and the length L1 is shortened. The wire 71b is joined to the front surface of the parallel portion 65. For this reason, it is preferable that the angle α of the parallel portion 65 is such that a joinable area (length L1) is secured.

[0054] Here, a reference example for the lead frame 60 will be described with reference to Figs. 8 and 9. Fig. 8 is a cross-sectional view (before wire bonding) of a lead frame included in a semiconductor device of the reference example, and Fig. 9 is a cross-sectional view (after wire bonding) of a lead frame included in a semiconductor device of the reference example. In the reference example, a lead frame 160 is provided instead of the lead frame 60 in Figs. 6 and 7. Other configurations are similar to those in Figs. 6 and 7.

[0055] The lead frame 160 also includes a chip bonding portion 61, a wiring bonding portion 62, and a wiring portion 63. The wiring portion 63 of the reference example further includes a vertical portion 64a, a parallel portion 65, and a vertical portion 64b. The lower end of the vertical portion 64a is connected to the chip bonding portion 61, similar to the vertical portion 64, and the upper end of the vertical portion 64a rises vertically upward relative to the chip bonding portion 61. The angle R1 formed between the vertical portion 64a and the chip bonding portion 61 is approximately 90 degrees. It is sufficient that the angle R1 is substantially 90 degrees.

[0056] Similar to the parallel portion 65 included in the lead frame 60, the parallel portion 65 is connected to the upper end of the vertical portion 64a and extends from the upper end in parallel to the wiring boards 43b and 43d and the semiconductor chip 50c.

[0057] The vertical portion 64b extends vertically from the parallel portion 65 toward the wiring joint portion 62. An angle R2 is formed between the vertical portion 64b and the wiring joint portion 62. The angle R2 formed between the vertical portion 64b and the wiring joint portion 62 is approximately 90 degrees. It is sufficient that the angle R2 is substantially 90 degrees.

[0058] A case where the wire 71b is joined to the front surface of the parallel portion 65 of such a lead frame 160 will be described. The semiconductor unit 30 is sealed with the sealing member 29. As described above, the components included in the semiconductor unit 30 include those that have low adhesion to the sealing member 29. The sealing member 29 has low adhesion to, for example, the solder that is the joining member 46. For this reason, the sealing member 29 that seals the semiconductor unit 30 may peel off at the contact point with the joining member 46. The peeling that occurs in the sealing member 29 spreads. If the wire joining portion 71b1 of the wire 71b is located at the destination of the peeling, the wire 71b may be cut in response to the peeling. However, in the case of the reference example, the lead frame 160 has a rectangular shape in a side view. For this reason, even if the peeling of the sealing member 29 spreads along the dashed arrows A1 and A2 in FIG. 8, the one end of the wire 71b is away from the peeling point, so that it is more likely that it will not be affected by the peeling. Also, the peeling of the sealing member 29 extending along the dashed arrows A1 and A2 is suppressed at the connection points between the parallel portion 65 and the vertical portions 64a and 64b. Therefore, the extension of the peeling of the sealing member 29 does not reach the wire 71b. In this way, it is expected that the wire 71b is prevented from being cut. In a reliability test (power cycle test) of such a semiconductor unit 30, peeling is more likely to occur around the chip joint portion 61 of the lead frame 160 sealed by the sealing member 29 than around the wiring joint portion 62. Therefore, peeling of the sealing member 29 is more likely to extend along the arrow A2 than along the arrow A1. This is due to local heat generation of the semiconductor chip 50c during the power cycle test. The chip joint portion 61 and the vertical portion 64a are heated by the local heat generation of the semiconductor chip 50c, and peeling is more likely to extend along the chip joint portion 61 and the vertical portion 64a (arrow A2).

[0059] However, in reality, when wire 71b is ultrasonically bonded while being pressed against the front surface of parallel portion 65, as shown in Fig. 9, parallel portion 65 is distorted toward insulating circuit board 40 (-Z direction) due to the pressure applied during bonding of wire 71b. Therefore, wire 71b cannot be reliably bonded to parallel portion 65 of lead frame 160. Furthermore, lead frame 160 is damaged. As a result, there is a concern that the reliability of a semiconductor device including such a lead frame 160 may decrease.

[0060] Also, in order to reliably join wire 71b to parallel portion 65 of lead frame 160, it is conceivable to make both angles R1 and R2 inclined at similarly acute angles to make lead frame 160 trapezoidal in side view. In this case, although the occurrence of distortion of parallel portion 65 is prevented more than when angles R1 and R2 are 90 degrees, the occurrence of distortion cannot be reliably suppressed.

[0061] Therefore, the lead frame 60 of this embodiment includes a chip joint portion 61, a wiring joint portion 62, and a wiring portion 63. The chip joint portion 61 is joined to the output electrode 52c on the front surface of the semiconductor chip 50c via a joining member. The wiring joint portion 62 is joined to the front surface of the wiring board 43d. The wiring portion 63 connects the chip joint portion 61 and the wiring joint portion 62 across the gap G between the wiring boards 43d, 43b. The wiring portion 63 further includes a vertical portion 64, a parallel portion 65, and an inclined portion 66. The lower end of the vertical portion 64 is connected to the chip joint portion 61, and the upper end of the vertical portion 64 is inclined relative to the chip joint portion 61. doIt rises vertically upward. That is, the angle R of the vertical portion 64 with respect to the chip joint portion 61 forms a right angle (90 degrees). The parallel portion 65 is connected to the upper end of the vertical portion 64, and is parallel to the wiring boards 43b, 43d and the semiconductor chip 50c from the upper end. The inclined portion 66 is inclined from the parallel portion 65 toward the wiring joint portion 62. Even if the wire 71b is joined to the front surface of the parallel portion 65 of the wiring portion 63 included in such a lead frame 60, the occurrence of distortion of the parallel portion 65 toward the insulating circuit board 40 side is suppressed. In particular, it has been confirmed that when the angle α is 30 degrees to 60 degrees, the occurrence of distortion of the parallel portion 65 toward the insulating circuit board 40 side is more suppressed than in the case of FIG. 8 and the case in which the angles R1 and R2 in FIG. 8 form the same acute angle. Furthermore, it has been confirmed that the occurrence of distortion of the parallel portion 65 toward the insulating circuit board 40 side is more suppressed when the angle α is 30 degrees or more and less than 45 degrees.

[0062] It should be noted that the angle R of the vertical portion 64 is not limited to 90 degrees, and as described above, even when the angle R is 80 degrees or more and less than 90 degrees, it has been confirmed that the occurrence of distortion of the parallel portion 65 toward the insulating circuit board 40 side can be suppressed by the angle α similar to that described above. In particular, when the angle R is 80 degrees or 85 degrees, the angle α should be 30 degrees or more and 60 degrees or less. below It is preferable that the angle is 30 degrees or more and 45 degrees or less.

[0063] Moreover, it is preferable that the wire 71b is joined to the vertical portion 64 side of the parallel portion 65. When the wire 71b is joined to the vertical portion 64 side of the parallel portion 65, the pressing force during joining is supported by the vertical portion 64, and distortion of the parallel portion 65 is further prevented. Therefore, the wire 71b can be reliably joined to the parallel portion 65 of the lead frame 60. Furthermore, in the semiconductor unit 30 including such a lead frame 60 sealed with the sealing member 29, as described above, even if peeling occurs in the sealing member 29 near the wiring joint 62 and the peeling extends from the wiring joint 62 to the inclined portion 66, the wire 71b is away from the peeling occurrence point and therefore the peeling does not extend to the wire 71b. Therefore, cutting due to peeling of the wire 71b is also prevented. As a result, the reliability of the semiconductor device 10 including the lead frame 60 is also suppressed from decreasing.

[0064] In addition, since the vertical portion 64 extends vertically upward from the chip bonding portion 61, a height H from the front surface of the semiconductor chip 50c to the parallel portion 65 can be ensured. By increasing the height H, it is possible to reduce the effect of local heat generation by the semiconductor chip 50c on the parallel portion 65 connected to the vertical portion 64. Therefore, even if peeling occurs in the sealing member 29 near the chip bonding portion 61 of the lead frame 60, the peeling is unlikely to extend from the chip bonding portion 61 to the vertical portion 64.

[0065] Also, as described above, the height H from the front surface of the semiconductor chip 50c to the parallel portion 65 can be ensured. In manufacturing the semiconductor device 10, a coating material mainly composed of a thermoplastic resin is sprayed into the storage areas 21e1 to 21e3 of the case 20 before sealing with the sealing member 29. That is, the surface of the semiconductor unit 30 is covered with a film. Such a film can protect the semiconductor unit 30. In particular, the adhesion of the semiconductor unit 30 to the sealing member 29 is improved through this film. Such a coating material is sprayed onto the target object by air spray from the nozzle of the coating device. For example, when the height from the nozzle to the target object is about 5 mm, the coating from the nozzle spreads to a diameter of about 8 mm on the target object. The coating needs to be applied to the entire surface of the semiconductor unit 30. As described above, the sealing member 29 has a reduced adhesion to the solder, which is the joining member 46. For this reason, it is preferable that the coating is appropriately applied around the chip joint portion 61 and the wiring joint portion 62 of the lead frame 60. Therefore, in the wiring portion 63 of the lead frame 60, a vertical portion 64 is provided in the chip bonding portion 61 to ensure a height H from the front surface of the semiconductor chip 50c to the parallel portion 65. Since the height H can be ensured, the coating can be reliably applied by the nozzle to the periphery of the heel portion 61b (-X direction) of the chip bonding portion 61 of the lead frame 60. Therefore, in the semiconductor unit 30, a coating is applied to the front surface of the insulating circuit board 40, the semiconductor chips 50a to 50d, the wires 70a, 70b, 71a, 71b, 71c, 71d, 72a, 72b, and the surface of the lead frame 60.

[0066] The lead frame 60 connects the wiring board 43d and the output electrode 52c of the semiconductor chip 50c. Therefore, in the lead frame 60, the chip joint portion 61 is located higher than the wiring joint portion 62. The lead frame 60 may connect between wiring boards in some cases. Also, the lead frame 60 may be connected to another element instead of the semiconductor chip 50c. In other words, the lead frame 60 may connect different conductive parts across a gap.

[0067] (Variation 1) FIG. 3 can be referred to for the semiconductor unit 30 of the first modification. However, the semiconductor unit 30 of the first modification has a different lead frame 60. The lead frame 60 of the first modification will be described with reference to FIGS. 10 and 11. FIG. 10 is a cross-sectional view of the lead frame included in the semiconductor device of the embodiment (first modification), and FIG. 11 is a plan view of the lead frame included in the semiconductor device of the embodiment (first modification). FIGS. 10 and 11 correspond to FIGS. 6 and 7. FIG. 10 is a cross-sectional view taken along dashed line YY in FIG. 11.

[0068] The lead frame 60 of the first modification has one or more grooves 66a formed on the front surface (surface facing the +X direction) of the vertical portion 64. In the first modification, the case where two grooves 66a are formed is taken as an example. The grooves 66a are formed so as to be perpendicular to the long axis of the wire bonding portion 71b1 of the wire 71b. The grooves 66a are formed continuously and linearly so as to cross the width (±Y direction) of the vertical portion 64. The depth and width (length of the lead frame 60 in the wiring direction) of the grooves 66a are formed within a range that does not affect the conduction of electricity through the vertical portion 64. Such a depth may be, for example, 20% or more and 45% or less of the thickness of the vertical portion 64. The grooves 66a may not be continuous. That is, the grooves 66a may be formed in a linear broken line (discontinuous). The grooves 66a may not be linear, but may be, for example, V-shaped, wavy, or jagged.

[0069] The semiconductor unit 30 including the lead frame 60 is sealed with a sealing member 29. At this time, the sealing member 29 seals the chip joint portion 61 and the output electrode of the semiconductor chip 50c. 52c There is a risk that peeling will occur in the area in contact with the solder of the joining member 46 that joins the chip and the lead frame 60. If such peeling spreads from the chip joining portion 61 along the vertical portion 64, the groove portion 66a formed in the vertical portion 64 will suppress the spread of the peeling. This prevents the peeling from reaching the wire 71b, and also prevents the wire 71b from being cut due to peeling. As a result, the reliability of the semiconductor device 10 including the lead frame 60 is also prevented from decreasing.

[0070] One or more such grooves 66a may be formed on the front surface (facing the -X direction) of the inclined portion 66. The grooves 66a formed on the inclined portion 66 are also similar to those formed on the vertical portion 64. That is, the grooves 66a are formed so as to be perpendicular to the long axis of the wire bonding portion 71b1 of the wire 71b. The grooves 66a may be formed continuously and linearly so as to cross the width (±Y direction) of the inclined portion 66. The depth and width of the grooves 66a (length in the wiring direction of the lead frame 60) may also be similar to those described above, and the grooves 66a may not be continuous. There is a risk that peeling will occur in the sealing member 29 in the area where it contacts the solder of the bonding member 46 that bonds the wiring bonding portion 62 and the wiring board 43d. If such peeling extends from the wiring bonding portion 62 along the inclined portion 66, the grooves 66a formed on the inclined portion 66 will suppress the extension of the peeling.

[0071] (Variation 2) In Modification 2, a case in which a protrusion is formed on the lead frame 60 of FIGS. 6 and 7 will be described with reference to FIGS. 12 and 13. FIG. 12 is a cross-sectional view of the lead frame included in the semiconductor device of the embodiment (Modification 2), and FIG. 13 is a plan view of the lead frame included in the semiconductor device of the embodiment (Modification 2). Note that FIGS. 12 and 13 correspond to FIGS. 6 and 7. FIG. 12 is a cross-sectional view taken along dashed line YY in FIG. 13. FIG. 3 can also be referred to for the semiconductor unit 30 of Modification 2.

[0072] In the lead frame 60 of the second modification, a plurality of protrusions 66b are formed on the front surface (surface facing the +X direction) of the vertical portion 64 of the wiring portion 63. In the second modification, the protrusions 66b are semispherical, and two rows of four protrusions 66b are formed. In this case, the protrusions 66b are formed so as to be perpendicular to the wire bonding portion 71b1 of the wire 71b. The four protrusions 66b are an example, and the number of protrusions 66b may be one, two, three, five or more depending on the area of ​​the protrusions 66b as long as the width (±Y direction) of the vertical portion 64 can be approximately covered. The two rows are an example, and one row, three rows or more may be formed. The protrusions 66b are not limited to a semispherical shape, and may be convex, for example, a triangular pyramid shape, a square pyramid shape, or a cube shape. The protrusions 66b may be continuously linear so as to cross the width (±Y direction) of the inclined portion 66, and may be formed so as to have a convex cross section. In this case, the protrusion 66b extends in a direction perpendicular to the long axis of the wire bonding portion 71b1. The height and width of the protrusion 66b (the length in the wiring direction of the lead frame 60) may be within a range that does not interfere with the wire 71b.

[0073] As described in the first modification, the semiconductor unit 30 including the lead frame 60 is sealed by the sealing member 29. At this time, there is a risk that the sealing member 29 may peel off in the area where it contacts the solder of the joining member 46 that joins the chip joining portion 61 and the output electrode 52c of the semiconductor chip 50c. If this peeling spreads from the chip joining portion 61 along the vertical portion 64, the protrusion 66b formed on the vertical portion 64 of the lead frame 60 suppresses the spread of the peeling. Therefore, the wire 71b is also prevented from being cut due to peeling. As a result, the reliability of the semiconductor device 10 including the lead frame 60 is also suppressed from decreasing.

[0074] The plurality of protrusions 66b may be formed on the front surface (facing the -X direction) of the inclined portion 66. The plurality of protrusions 66b formed on the inclined portion 66 are also similar to those formed on the vertical portion 64. That is, the plurality of protrusions 66b are formed so as to be perpendicular to the long axis of the wire bonding portion 71b1 of the wire 71b. The plurality of protrusions 66b formed on the inclined portion 66 may also be one or more, or may be in one or more rows, depending on the area of ​​the protrusions 66b, as long as the width (±Y direction) of the inclined portion 66 can be approximately covered. There is a risk that peeling will occur in the sealing member 29 in the area where it contacts the solder of the bonding member 46 that bonds the wiring bonding portion 62 and the wiring board 43d. If such peeling extends from the wiring bonding portion 62 along the inclined portion 66, the extension of the peeling is suppressed by the plurality of protrusions 66b formed on the inclined portion 66.

[0075] The foregoing merely illustrates the principles of the present invention. Further, since numerous modifications and changes are possible to those skilled in the art, the present invention is not limited to the exact construction and application shown and described above, and all corresponding modifications and equivalents are deemed to be within the scope of the present invention according to the appended claims and their equivalents. [Explanation of symbols]

[0076] 10 Semiconductor device 20 cases 21 Main body 21a to 21d First to fourth side portions 21a1~21a3 Terminal area 21e1~21e3 Storage area 22a~22c First power terminal 22b1,22b2,24b1,24b2 Internal joint 23a~23c Insulation sheet 24a~24c Second power terminal 25a~25c Terminal stacking section 26a~26c Control frame section 26b1~26b4 Control terminals 27a U terminal 27b V terminal 27b1,27b2 Internal connection 27c W terminal 28a, 28b, 28c Terrace section 29 Sealing member 30 Semiconductor Unit 40 Insulated circuit board 41 Insulating plate 41a, 41c Long side 41b, 41d short side 41e~41h corner 42 Metal plate 43a~43i wiring board 45 Heat dissipation base plate 46 Joining materials 50a~50d Semiconductor chips 50a1~50d1 Chip area 51a~51d Control electrodes 52a~52d Output electrodes 60,60a~60d Lead frame 61 Chip joint 61a, 62a Toe 61b,62b Heel 62 Wiring joint 63 Wiring section 64 Vertical section 65 Parallel section 66 Inclined section 66a Groove 66b Protrusion 70a, 70b, 71a, 71b, 71c, 71d, 72a, 72b Wire 71b1 Wire joint

Claims

1. a first conductive portion and a second conductive portion provided with a gap therebetween; a connection wiring including a first bonding portion bonded to a first front surface of the first conductive portion, a second bonding portion bonded to a second front surface of the second conductive portion, and a wiring portion that connects the first bonding portion and the second bonding portion across the gap; A wire joined to the wiring portion; Including, The wiring portion is a vertical portion having a lower end connected to the first joint portion and an upper end rising vertically upward relative to the first joint portion; a parallel portion extending from the upper end of the vertical portion in parallel to the first conductive portion and the second conductive portion, the parallel portion having a wire bonding portion on one end side of the wire bonded to a front surface thereof; an inclined portion inclined from the parallel portion toward the second joint portion; Contains Semiconductor device.

2. The first conductive portion is a main electrode provided on a front surface of a semiconductor chip. The semiconductor device according to claim 1 .

3. The inclination angle of the inclined portion with respect to the second joint portion is 30 degrees or more and 60 degrees or less. The semiconductor device according to claim 1 .

4. one or more grooves or one or more protrusions are formed perpendicular to a wiring direction of the wiring portion between the wire bonding portion and the second bonding portion on the front surface of the wiring portion; The semiconductor device according to claim 1 .

5. The wire bonding portion is bonded to the parallel portion of the wiring portion on the vertical portion side in a plan view. The semiconductor device according to claim 1 .

6. a coating having adhesion to a sealing member is applied to each of the first conductive portion, the second conductive portion, the wiring portion, and the wire; 6. The semiconductor device according to claim 1, 4 or 5.

7. (delete)

Images