WO2012169044A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2012169044A1 WO2012169044A1 PCT/JP2011/063246 JP2011063246W WO2012169044A1 WO 2012169044 A1 WO2012169044 A1 WO 2012169044A1 JP 2011063246 W JP2011063246 W JP 2011063246W WO 2012169044 A1 WO2012169044 A1 WO 2012169044A1
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- lead
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- semiconductor device
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- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/10—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices having separate containers
- H01L25/11—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in group H01L29/00
- H01L25/115—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in group H01L29/00 the devices being arranged next to each other
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Definitions
- the present invention relates to a resin-encapsulated semiconductor device for constituting a power inverter circuit using a MOS-FET element.
- control devices are integrated into a vehicular rotating electrical machine and downsizing of in-vehicle devices is progressed, semiconductor devices used for them are also required to be downsized, lightweight, and highly reliable.
- in-vehicle power semiconductor devices are required to cope with large current control while being downsized.
- the lower electrode of the MOS-FET element is soldered onto the insulating substrate wiring, and the upper electrode bonded to the substrate wiring by wire bonding is housed in a resin case.
- a type has been developed in which the lower electrode of the MOS-FET element is soldered to a metal lead frame, the upper electrode and the lead frame are soldered and joined with internal leads, and the resin is sealed by transfer molding. ing.
- Patent Document 1 and Patent Document 2 Conventional semiconductor devices in which the upper electrode of the MOS-FET element and the lead frame are joined by an internal lead have been proposed in, for example, Patent Document 1 and Patent Document 2. (See Patent Document 1 and Patent Document 2).
- Patent Document 1 since the joint surface of the internal lead (frame) is formed small so as to fit inside the surface of the electrode part of the semiconductor chip, the position of the electrode part and the internal lead is determined by self-alignment. The position is supposed to be maintained.
- the lead frame since there is no means for aligning the lead frame (second lead terminal) and the internal lead, the position of the lead frame and the internal lead shifts when the internal lead is moved or when the internal lead moves when the solder melts. There is concern.
- the lead frame In order to reduce the size of the semiconductor device, the lead frame also needs to be narrow. However, if there is a misalignment of the internal leads, the lead frame bonding surface is widened to allow it to be secured. It is necessary to reduce the size of the semiconductor device.
- the solder thickness may change or the solder may be biased, causing the semiconductor chip or internal lead to move. There is a concern about the inclination.
- Patent Document 2 the connecting portion of the lead frame and the internal lead is provided with a convex portion on one side and a concave portion on the other side to be fitted and determined, but the positioning of the semiconductor pellet and the internal lead is determined. There is no means, and there is a concern that the bonding position varies due to variations in the mounting position of the semiconductor pellet and the internal lead and the solder flow during solder melting.
- the projections and recesses provided in the connection part between the lead frame and the internal lead are fitted, but if there is a variation in the mounting position of the internal lead, it will not be fitted correctly, and the position will be shifted and tilted There is also concern about joining in a state. Further, when a MOS-FET element is used for the semiconductor pellet in the structure of this example, if the MOS-FET element after soldering is inclined, the wire bond bonding to the gate electrode becomes unstable.
- the present invention has been made to solve the above-described problems.
- a semiconductor device in which a MOS-FET element and a lead frame are electrically joined by an internal lead, even if the lead frame and the internal lead are downsized, the lead
- the present invention proposes a structure that can stably join the position of the frame and the internal lead and the position of the internal lead and the MOS-FET element, and aims to reduce the size and thickness of the semiconductor device.
- a semiconductor device includes a first lead, a second lead that is partially deformed to provide a protrusion, a MOS-FET element in which a bottom electrode is electrically joined to the first lead, An internal lead for passing a current between the upper electrode of the MOS-FET element and the second lead, a solder material for electrically connecting them, and a sealing resin for fixing their relative positions,
- the lead of the first lead and the second lead are on the same plane, and the inner lead has the same plane of joint between the MOS-FET element and the second lead,
- the lower electrode of the MOS-FET element is joined with the first solder
- the upper electrode of the MOS-FET element and the internal lead are joined with the second solder
- the protrusion of the internal lead and the second lead is the third solder.
- the first 2 is a semiconductor device in which a lead, a MOS-FET element, and an internal lead are integrally formed of a sealing resin, and provided with at least a support member positioned inside the first solder and inside the second solder Is.
- the semiconductor device of the present invention when the internal lead and the MOS-FET element move by the self-alignment, the MOS-FET element and the internal lead are kept horizontal, and the self-alignment can be surely realized.
- the second lead and the internal lead can be designed to the minimum necessary size, and the semiconductor device can be miniaturized.
- solder thickness is stabilized, it is possible to prevent a short circuit between the upper electrode and the lower electrode of the MOS-FET element and a short circuit between the upper electrode and the gate electrode due to the solder flow.
- FIG. 1 is a plan view showing a semiconductor device according to a first embodiment of the present invention. It is a figure which shows the internal lead and MOS-FET element in Embodiment 1 of this invention. It is a figure explaining the soldering process of the semiconductor device in Embodiment 1 of this invention. It is a figure explaining the deformation
- Embodiment 1 of the present invention will be described below with reference to the drawings.
- 1 is a diagram showing a cross-sectional structure of a semiconductor device according to the first embodiment of the present invention
- FIG. 2 is a diagram showing a planar structure of the semiconductor device according to the first embodiment of the present invention
- FIG. 3 is an internal lead in the first embodiment. 2 is a diagram showing a MOS-FET element.
- the MOS-FET element 21 is disposed on the first lead 11, and the lower electrode 23 of the MOS-FET element 21 is attached to the first solder 51.
- One end portion of the internal lead 31 is joined to the upper surface electrode 22 of the MOS-FET element 21 via the second solder 52, and the other end portion is joined to the second electrode via the third solder 53.
- 2 is joined to the protrusion 61 of the lead 12.
- the protrusion 61 of the second lead 12 is formed by deforming a part of the second lead 12 by doweling.
- the lower surface of the first lead 11 and the lower surface of the second lead 12 are in the same plane, and a heat sink (not shown) is attached to the plane via heat-dissipating grease or heat-dissipating adhesive (not shown).
- the first solder 51 has a first support member 54
- the second solder 52 has a second support member 55
- the third solder 53 has a third support member 56. Has been placed.
- the support members 54 to 56 are spherical members made of a metal which is wet with solder and does not melt at the solder melting temperature, and is, for example, spherical Ni particles or Cu particles.
- the gate electrode 24 and the gate lead 13 are electrically connected by an aluminum wire 71.
- first lead 11, second lead 12, solder 51 to 53, MOS-FET element 21, internal lead 31, aluminum wire 71, and gate lead 13 are molded with a sealing resin 41 and fixed.
- a part of the first lead 11, a part of the second lead 12, and a part of the gate lead 13 are outside the sealing resin 41 and can be electrically connected to the outside.
- the back surface of the junction part of the MOS-FET element 21 of the first lead 11 and the back surface of the joint part of the internal lead 31 of the second lead 12 are exposed from the sealing resin 41.
- the structure is not limited to this.
- the structure may be covered with the sealing resin 41 or may be covered with a heat conductive insulating member (not shown).
- FIG. 3A is a side view of the internal lead 31, and FIG. 3B is a plan view seen from the joint surface.
- the internal lead 31 is provided with a first bonding plane 32 and a second bonding plane 33 by bending, and the first bonding plane 32 and the second bonding plane 33 are in the same plane. Further, a through hole 34 is provided in the plane of the second bonding plane 33, and a through hole 35 is provided in the non-joint plane.
- a bonding surface 62 is formed on the upper surface of the protrusion 61 provided on a part of the second lead 12, and as shown in FIGS.
- the first bonding plane 32 of the internal lead 31 has a shape substantially the same as the bonding surface 62.
- the MOS-FET element 21 is provided with an upper surface electrode 22 and a gate electrode 24 on the surface, and a protective film 25 is provided on the surface.
- the opening shape of the protective film 25 is circular, and as shown in FIGS. 1 and 2, the second bonding plane 33 of the internal lead 31 is inscribed in the opening electrode shape of the upper surface electrode 22 of the MOS-FET element 21. It has a shape.
- the second bonding plane 33 of the internal lead 31 in FIG. 3B has a substantially circular shape, but is not limited to this, and is not limited to a square shape as shown in FIG. An ellipse or an ellipse may be used. If the outer shape is inscribed in the shape of the upper surface electrode 22 of the MOS-FET element 21 at three or more locations, the effect of position correction by self-alignment can be obtained.
- FIG. 4 is a diagram for explaining a soldering process of the semiconductor device according to the first embodiment.
- FIG. 4A shows a state where the MOS-FET element 21 is soldered to the first lead 11. At this time, the MOS-FET element 21 may be displaced from the target position due to variations in the mounting position of the mounting apparatus.
- FIG. 4B shows a state in which a solder paste is applied to the upper surface electrode 22 of the MOS-FET element 21 and the protrusion 61 of the second lead 12 and the internal lead 31 is mounted.
- the solder paste is a solder paste in which a support member is mixed, and the same solder paste is used for the second solder 52 and the third solder 53 and is supplied in the same process.
- the internal lead 31 may be displaced from the target position due to variations in the mounting position of the mounting apparatus. Also, the amount of solder paste supplied may vary.
- the first solder 51 located on the lower surface of the MOS-FET element 21 is also remelted, and the self-alignment due to the surface tension of the second solder 52 causes the inner shape of the upper surface electrode 22 of the MOS-FET element 21 to be internal.
- the MOS-FET element 21 moves so that the second bonding plane 33 of the lead 31 is in the inscribed position. At this time, if there is excess solder in the second solder 52, it passes through the through hole 34 and moves to the upper surface of the internal lead 31, and the amount of solder at the joint is adjusted.
- the support member 54 is inside the first solder 51, the support member 55 is inside the second solder 52, and the support member 56 is inside the third solder 53, the internal lead 31.
- the MOS-FET element 21 can move smoothly and is kept horizontal even if it moves.
- the gate electrode 24 and the gate lead 13 are joined by the aluminum wire 71 by a process (not shown). However, since the MOS-FET element 21 is joined without being inclined, a stable aluminum wire joining can be obtained. Thereafter, the semiconductor device is formed by molding with the sealing resin 41.
- the solder paste mixed with the metal particles is supplied.
- the support member and the method of supplying the solder are not limited to this.
- a plate solder containing the support member is cut out only in a necessary shape. May be installed.
- the deformation as shown in FIG. 5 occurs due to the difference in the linear expansion coefficient between the sealing resin and the lead frame.
- the through-hole 35 is provided in the non-joined portion of the internal lead 31 and the through-hole 35 is filled with the sealing resin 41.
- the semiconductor device 1 of the first embodiment of the present invention since the support member is disposed inside the first solder and the second solder, the first solder and When the second solder melts and the internal lead and the MOS-FET element move due to self-alignment, the MOS-FET element and the internal lead are kept horizontal by the support member, so that self-alignment can be realized reliably.
- the first lead, the second lead, and the internal lead can be designed to the minimum necessary size, and the semiconductor device can be miniaturized.
- first lead planar shape of the internal lead and the top surface of the second lead protrusion are approximately the same, so that the position of the internal lead is self-aligned with respect to the second lead due to the surface tension of the solder. It is corrected by the effect.
- the second lead planar shape of the internal lead is formed so as to be substantially inscribed in the outer shape of the opening shape of the upper surface electrode of the MOS-FET element, so that the internal lead and the MOS-FET are caused by the surface tension of the second solder.
- the position of the element is corrected by self-alignment.
- the MOS-FET element moves to match the internal lead position, and the position of the second lead, internal lead, and MOS-FET element. Is corrected.
- the opening shape of the upper electrode of the MOS-FET element is circular, the self-alignment is smoothly performed even if there is an angle shift between the MOS-FET element and the internal lead in the horizontal plane. Even if the MOS-FET element and the internal lead are designed to be arranged at an angle, the internal leads symmetrical in the major axis direction can be used, and the balance of the internal leads can be maintained.
- the supporting member is made of a spherical metal, the supporting member is easy to roll, and the internal lead and the MOS-FET element can be moved smoothly by self-alignment when the solder is melted. Furthermore, since the contact surface with the MOS-FET element is a spherical surface, the occurrence of cracks in the MOS-FET element starting from the support member during thermal deformation can be prevented.
- the second solder and the third solder can be made into the same solder paste in which spherical metal is mixed, and solder can be supplied in the same process.
- the manufacturing process can be simplified.
- the through-hole is provided in the second bonding plane portion of the internal lead corresponding to the MOS-FET element upper surface electrode bonding portion, the position of the internal lead and the MOS-FET element is changed by self-alignment.
- the excess solder or the excess solder due to the variation in the supply amount can be released to the upper surface of the second bonding plane of the internal lead through the through hole, and the MOS-FET element by the solder flow to the MOS-FET element surface A short circuit between the upper electrode and the lower electrode and a short circuit between the upper electrode and the gate electrode can be prevented.
- the adhesion between the internal lead and the sealing resin is improved, so even if the thickness of the sealing resin is reduced or the semiconductor device is deformed due to temperature changes. Prevents peeling of internal leads and sealing resin, and reduces stress load on solder and MOS-FET elements during thermal deformation.
- FIG. A second embodiment of the present invention will be described with reference to the drawings.
- 6 is a diagram showing a cross-sectional structure of the semiconductor device of the second embodiment
- FIG. 7 is a diagram showing a planar structure of the second embodiment
- FIG. 8 is a diagram showing a MOS-FET element in the second embodiment.
- the support member inside the second solder 52 is a support member 57 formed by ultrasonic bonding of a metal wire
- 3 has the same structure as that of the first embodiment except that a support member is not provided inside the solder 53.
- a support member is formed on the upper surface electrode 22 of the MOS-FET element 21 by ultrasonic bonding of a plurality of metal wires 57. Further, the height of the joint surface of the protrusion 61 of the second lead is set so that the joined internal lead 31 is horizontal even if the support member 56 is not provided.
- the position of the internal lead 31 and the position of the MOS-FET element 21 are corrected based on the protrusion 61 provided on the second lead 12 by self-alignment. Even if the internal lead 31 and the MOS-FET element 21 move at this time, the internal lead 31 and the MOS-FET element 21 are kept horizontal because of the support member 54 and the support member 57. Further, since the support member 57 is a metal wire ultrasonically bonded to the upper surface electrode 22 of the MOS-FET element 21, the position does not shift even if the internal lead 31 moves, and the internal lead 31 can be stably leveled. keep.
- the material of the metal wire that is the support member 57 is, for example, an aluminum wire.
- aluminum is used as the material of the metal wire, it is softer than Ni or Cu. Therefore, even if the MOS-FET element 21 is pressed against the aluminum wire due to thermal stress, the MOS-FET element starting from the contact portion with the aluminum wire Generation of cracks can be suppressed.
- the support member located inside the second solder is obtained by ultrasonically bonding the metal wire to the upper surface electrode of the MOS-FET element.
- FIG. Embodiment 3 is a diagram showing a planar structure of the semiconductor device 3 according to the third embodiment of the present invention
- FIG. 10 is a circuit diagram of the semiconductor device according to the third embodiment.
- the first MOS-FET element 21 is arranged on the first lead 11, and the lower electrode 23 of the first MOS-FET element 21 is connected to the first lead 11 via the first solder 51. It is joined with.
- One end of the internal lead 31 is joined to the upper surface electrode 22 of the first MOS-FET element 21 via the second solder 52, and the other end of the internal lead 31 is connected to the third solder 53.
- the protrusion 61 is formed on a part of the second lead 12 by doweling, and the upper surface thereof is substantially the same shape as the first bonding plane 32 of the internal lead 31.
- the upper surface electrode 22 of the first MOS-FET element 21 has an opening formed in a circular shape by the protective film 25, and the outer shape of the second bonding plane 33 of the internal lead 31 is a shape inscribed in the opening. It has become.
- the gate electrode 24 and the gate lead 13 are electrically connected by an aluminum wire 71.
- the second MOS-FET element 26 is disposed on the second lead 12, and the lower electrode of the second MOS-FET element 26 is joined to the second lead 12 via the first solder 51. ing.
- One end of the second internal lead 36 is joined to the upper surface electrode of the second MOS-FET element 26 via the second solder 52, and the other end of the second internal lead 36 is It is joined to a protrusion 63 provided on the third lead 15 through a third solder 53.
- the protruding portion 63 is formed on a part of the third lead 15 by doweling, and the upper surface thereof is substantially the same shape as the first bonding plane of the internal lead 36.
- the upper surface electrode of the second MOS-FET element 26 has an opening formed in a circular shape by the protective film 30, and the outer shape of the second bonding plane of the internal lead 36 is inscribed in the opening. Yes.
- the gate electrode 29 and the gate lead 14 are electrically connected by an aluminum wire 72.
- first to third leads 11, 12 and 15, first to third solders 51 to 53, MOS-FET elements 21 and 26, internal leads 31 and 36, aluminum wires 71 and 72, gate lead 13 , 14 are molded and fixed integrally with a sealing resin 41.
- the first to third leads 11, 12, 15 and part of the gate leads 13, 14 are outside the sealing resin 41 and can be electrically connected to the outside.
- a semiconductor device in which the upper and lower arms of the inverter circuit are integrated is configured.
- a circuit diagram of a semiconductor device integrated with upper and lower arms is shown in FIG.
- first support 51, the second solder 52, and the third solder 53 are respectively provided with a first support in the same manner as described in the first and second embodiments.
- a member, a second support member, and a third support member are provided.
- soldering process of the semiconductor device 3 according to the third embodiment shown in FIG. 9 after mounting two MOS-FET elements, supplying solder to the two upper electrodes of the MOS-FET elements, and soldering to the two projecting surfaces Supplying and mounting of two internal leads are performed in the same process, and the solder is melted by a reflow process.
- the combination of the first MOS-FET element 21 and the first internal lead 31 constituting the upper arm 111, the second MOS-FET element 26 constituting the lower arm 112, and the second The combination of the inner leads 36 is in the reverse orientation. By doing so, the distance between the upper arm 111 and the lower arm 112 can be reduced, and the semiconductor device incorporating the pair of upper and lower arms can be reduced in size.
- wiring outside the semiconductor device can be omitted, so that the electrical equipment can be downsized.
- Embodiment 4 11 is a plan view showing an inverter device 102 according to Embodiment 4 of the present invention
- FIG. 12 is an electric circuit diagram of a rotating electrical machine 100 using the inverter device of FIG.
- the positive electrode terminal and the negative electrode terminal of the semiconductor device 1 are arranged so as to protrude from a substantially rectangular facing surface formed of a sealing resin.
- Half of the semiconductor devices have a mirror symmetry structure.
- the first solder 51, the second solder 52, and the third solder 53 (not shown)
- a first support member, a second support member, and a third support member are provided and are designed to be small.
- the semiconductor device 1 is arranged concentrically and constitutes an inverter device 102.
- the positive terminal of the semiconductor device 1 is electrically joined to a positive voltage supply component 81 disposed on the inner periphery.
- the positive voltage supply component 81 is connected to the positive electrode of the power storage means by a wiring (not shown).
- the negative terminal of the semiconductor device 1 is electrically joined to a negative voltage supply component 82 disposed on the outer periphery.
- the negative voltage supply component 82 is connected to the negative electrode of the power storage means by a wiring (not shown).
- the electrical connection may be, for example, welding or soldering.
- the power output terminals 83 of each phase are connected to the coil of the rotating electrical machine by wiring not shown.
- the semiconductor device 1, the positive voltage supply component 81, and the negative voltage supply component 82 can be arranged on substantially the same plane, so that the inverter device 102 can be thinned. Further, by configuring the rotating electrical machine incorporating the inverter device of the fourth embodiment, the inverter-integrated rotating electrical machine can be thinned.
- the number of semiconductor devices is six (six phases), but is not limited thereto.
- the positive voltage supply component 81 is not limited to a hexagon, and may be a polygon or a circle. Further, in FIG. 11, the positive voltage supply component 81 is disposed on the inner peripheral side, but the negative voltage supply component 82 may be disposed on the inner peripheral side. In this case, the semiconductor device may be arranged so that the negative electrode of the semiconductor device 1 faces inward.
- FIG. 12 shows an electric circuit diagram of the rotating electrical machine 100 incorporating the inverter device 102 shown in FIG.
- the rotating electrical machine 100 includes a control unit 101, an inverter device 102, fixed coils 103 and 104, and a movable coil 105.
- Each phase of the fixed coil 103 and the fixed coil 104 is connected to the power storage means 120 via an upper arm portion 111 and a lower arm portion 112 made of MOS-FET elements, and controls these MOS-FET elements.
- each MOS-FET element is ON / OFF controlled, and the current flowing through each phase of the fixed coils 103, 104 is switched.
- the rotating electrical machine 100 can drive the movable coil 105 in response to a signal from the control means 101 or can generate electric power from the rotation of the movable coil 105.
- the positive voltage connection terminal, the negative voltage connection terminal, and the voltage output terminal are arranged on the opposing surfaces of the semiconductor device, whereby the semiconductor device is arranged concentrically. Even if the inverter device is configured, the positive voltage connection terminal and the negative voltage connection terminal can be arranged on substantially the same plane, so that the rotating machine incorporating the inverter device can be thinned.
- half of the semiconductor devices have a mirror-symmetric structure, so that the connection length on the outer peripheral side can be shortened, wiring can be simplified, and electrical resistance can be reduced.
- the present invention is suitable for constituting a power inverter device using a resin-encapsulated semiconductor device using a MOS-FET element.
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
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- Lead Frames For Integrated Circuits (AREA)
Abstract
Description
また、車載用のパワー半導体装置においては、小型化する一方で大電流制御への対応も求められる。
(特許文献1、特許文献2 参照)。
半導体装置を小型化するためには、リードフレームも幅の狭いことが必要であるが、内部リードの位置ずれがあると、それを許容して接合を確保するためにリードフレームの接合面を広くする必要があり半導体装置の小型化が難しくなる。
また、この例の構造で半導体チップにMOS-FET素子を用いたとき、はんだ付け後のMOS-FET素子が傾いていると、ゲート電極へのワイヤボンド接合が不安定になる問題もある。
また、この例の構造で半導体ペレットにMOS-FET素子を用いたとき、はんだ付け後のMOS-FET素子が傾いていると、ゲート電極へのワイヤボンド接合が不安定になる。
以下この発明の実施の形態1を図に基づいて説明する。
図1は本発明の実施の形態1の半導体装置の断面構造を示す図、図2は本発明の実施の形態1の半導体装置の平面構造を示す図、図3は実施の形態1における内部リードとMOS-FET素子を示す図である。
MOS-FET素子21の上面電極22には、第2のはんだ52を介して内部リード31の一方の端部が接合されており、もう一方の端部は、第3のはんだ53を介して第2のリード12の突起部61と接合されている。第2のリード12の突起部61はダボ出し加工により第2のリード12の一部を変形させて形成されている。
また、第1のはんだ51の内部には第1の支持部材54、第2のはんだ52の内部には第2の支持部材55、第3のはんだ53の内部には第3の支持部材56が配置されている。
ゲート電極24とゲート用リード13はアルミワイヤ71で電気的に接続されている。
図3(a)は内部リード31の側面図、図3(b)は接合面から見た平面図を示す。内部リード31は屈曲加工により第1の接合用平面32と第2の接合用平面33が設けられており、第1の接合用平面32と第2の接合用平面33は同一平面内にある。
また、第2の接合用平面33の面内に貫通穴34、非接合面に貫通穴35が設けてある。
また、図3(d)に示すように、MOS-FET素子21は表面に上面電極22とゲート電極24が設けられていて、かつ表面には保護膜25が備えられている。
保護膜25の開口形状は円形であり、図1、図2に示すように、内部リード31の第2の接合用平面33は、MOS-FET素子21の上面電極22の開口電極形状に内接する形状となっている。
図4(a)は第1のリード11にMOS-FET素子21をはんだ付けした状態を示す。このときMOS-FET素子21は実装装置の搭載位置のばらつきのため狙いの位置からずれていることがある。
はんだペーストは支持部材を混合したはんだペーストで、第2のはんだ52、第3のはんだ53に同一のものを用い同一工程で供給される。
このとき、第3のはんだ53に余剰なはんだがあると突起部61の側面に流れ落ちるが、突起部の接合面62上のはんだの外形は変わらないためセルフアライメント位置は保たれる。
また、セルフアライメントが実現できるため、高精度の実装装置は必要ない上、はんだ溶融時に内部リード、MOS-FET素子の位置を保持する手段も必要なく、製造工程の簡略化が可能となる。
また、はんだ厚さが安定するので、はんだ流れによるMOS-FET素子上面電極と下面電極または上面電極とゲート電極のショートを防ぐことができる。
さらに、MOS-FET素子との接触面が球面であるため、熱変形時に支持部材を起点としたMOS-FET素子のクラック発生を防ぐことができる。
この発明の実施の形態2を図に基づいて説明する。
図6は実施の形態2の半導体装置の断面構造を示す図、図7は実施の形態2の平面構造を示す図、図8は実施の形態2におけるMOS-FET素子を示す図である。
この実施の形態2の半導体装置2は、図6、図7に示すように、第2のはんだ52の内部の支持部材を、金属ワイヤの超音波接合により形成した支持部材57とし、また、第3のはんだ53の内部には支持部材を設けていない点が異なる以外は、実施の形態1と同様の構造である。
また第2のリードの突起部61の接合面の高さは、支持部材56を設けていなくても、接合した内部リード31が水平になるように設定している。
この発明の実施の形態3を図に基づいて説明する。
図9は本発明の実施の形態3の半導体装置3の平面構造を示す図、図10は実施の形態3の半導体装置の回路図である。
図9において、第1のリード11の上に第1のMOS-FET素子21を配置し、第1のMOS-FET素子21の下面電極23を第1のはんだ51を介して第1のリード11と接合している。
第1のMOS-FET素子21の上面電極22には、第2のはんだ52を介して内部リード31の一端が接合されており、内部リード31のもう一方の端部は、第3のはんだ53を介して第2のリード12に設けた突起部61と接合されている。
ここで突起部61は、第2のリード12の一部にダボ出し加工により形成されたものであり、その上面は内部リード31の第1の接合用平面32と概同形状である。
ここで、突起部63は第3のリード15の一部にダボ出し加工により形成されたものであり、その上面は内部リード36の第1の接合用平面と概同形状である。
ゲート電極29とゲート用リード14はアルミワイヤ72で電気的に接続されている。
ただし、第1~第3のリード11、12、15、ゲート用リード13、14の一部は、封止樹脂41の外部にあり、外部との電気接続が可能である。これにより、インバータ回路の上下アームを一体とした半導体装置を構成している。上下アーム一体の半導体装置の回路図を図10に示す。
このようにすることで上アーム111と下アーム112の距離が小さくでき、一対の上下アームを内蔵した半導体装置を小型化できる。
図11は本発明の実施の形態4によるインバータ装置102を示す平面図、図12は図11のインバータ装置を用いた回転電機100の電気回路図である。
図11において、半導体装置1の正極端子と負極端子は、封止樹脂によって形成された概長方形の対向面から突出するよう配置されている。また、半数の半導体装置は鏡面対称構造となっている。
ここで半導体装置1の正極端子は、内周に配置された正電圧供給部品81に電気的に接合されている。正電圧供給部品81は、図示しない配線で蓄電手段の正極に接続される。
電気的接合はたとえば溶接やはんだ付けなどでよい。また、各相の電力出力端子83は、図示しない配線で回転電機のコイルに接続されている。
また、実施の形態4のインバータ装置を内蔵する回転電機を構成することで、インバータ一体型の回転電機を薄型化できる。
また、正電圧供給部品81は6角形に限らず、多角形や円形でも構わない。
さらに図11では正電圧供給部品81を内周側に配置したが、負電圧供給部品82を内周側に配置しても構わない。この場合、半導体装置1の負電極が内側に向くように半導体装置を配置すればよい。
13、14 ゲート用リード、15 第3のリード、
21、26 MOS-FET素子、22 上面電極、23 下面電極、
24、29 ゲート電極、25、30 保護膜、31、36 内部リード
32 第1の接合用平面、33 第2の接合用平面、34 貫通穴、
35 貫通穴、41 封止樹脂、51~53 はんだ、
54~57 支持部材、 61、63 突起部、
62 突起接合面、71、72 アルミワイヤ、
81 正電圧供給部品、 82 負電圧供給部品、83 電力出力端子、
100 回転電機、101 制御手段、102 インバータ装置、
103、104固定コイル、 105 可動コイル、
111 上アーム、112 下アーム、120 蓄電手段。
Claims (13)
- 第1のリードと、一部を変形させて突起部を設けた第2のリードと、前記第1のリードに下面電極が電気的に接合されたMOS-FETと、前記MOS-FETの上面電極と前記第2のリードとの間に電流を通電する内部リードと、これらを電気的に接合するはんだ材、および、これらの相対位置を固定する封止樹脂からなり、
前記第1のリードと前記第2のリードは下面が同一平面上にあり、かつ、前記内部リードは、前記MOS-FETとの接合面と、前記第2のリードとの接合面が同一平面であり、
前記第1のリードと前記MOS-FETの下面電極とが第1のはんだで接合され、
前記MOS-FETの上面電極と前記内部リードとが第2のはんだで接合され、
前記内部リードと前記第2のリードの突起部とが第3のはんだで接合され、
前記第1のリード、第2のリード、MOS-FETおよび内部リードが前記封止樹脂により一体に成形されている半導体装置であって、
少なくとも前記第1のはんだの内部と前記第2のはんだの内部に位置する支持部材を設けたことを特徴とする半導体装置 - 前記内部リードの第1の端部に屈曲により区切られた第1の接合用平面を設け、前記第2のリードに設けた突起部がダボ出し加工により形成された突起部であり、かつ前記第1の接合用平面形状と前記突起部の上面形状が実質的に同形状であることを特徴とする請求項1に記載の半導体装置。
- 前記内部リードの第2の端部に屈曲により区切られた第2の接合用水平面を設け、この第2の接合用平面が、前記MOS-FETの上面電極接合部分に形成された開口電極形状の外形に実質的に内接することを特徴とする請求項1に記載の半導体装置。
- 前記MOS-FETの上面電極接合部分の開口電極形状が円形であることを特徴とする請求項3に記載の半導体装置。
- 前記支持部材が球状金属であることを特徴とする請求項1~請求項4のいずれか1項に記載の半導体装置
- 前記第3のはんだの内部に位置する支持部材を設けたことを特徴とする請求項1~請求項4のいずれか1項に記載の半導体装置。
- 前記第2のはんだの内部に位置する支持部材が、金属ワイヤを前記MOS-FET上面電極に超音波接合することで形成されていることを特徴とする請求項1~請求項4のいずれか1項に記載の半導体装置。
- 前記内部リードの第2の接合用平面部に貫通穴を設けたことを特徴とする請求項3に記載の半導体装置。
- 前記内部リードの非接合部分に貫通穴を設けたことを特徴とする請求項1~請求項4のいずれか1項に記載の半導体装置。
- 少なくとも2組のMOS-FETと内部リードを用いて、
第1のリード上に第1のMOS-FETを配置して、第1のMOS-FETの下面電極と第1のリードを電気的に接続し、第1のMOS-FETの上面電極と第2のリードを第1の内部リードを介して電気的に接続し、第2のリード上に第2のMOS-FETを配置して、第2のMOS-FETの下面電極と第2のリードを電気的に接続し、第2のMOS-FETの上面電極と第3のリードを第2の内部リードを介して電気的に接続し、これらを一体の封止樹脂で成形したことを特徴とする請求項1に記載の半導体装置 - 前記第1のリードと前記第3のリードが前記封止樹脂の対向する面から樹脂外に突出していることを特徴とする請求項10に記載の半導体装置。
- 請求項11に記載の半導体装置を複数個、同一平面上かつ同心円上に配置し、内周側の同一平面上に配置した電力供給部品ですべての半導体装置の正極または、すべての半導体装置の負極を結合することを特徴とするインバータ装置。
- 半導体装置の半数を鏡面対称構造とし、同一平面上に配置した電力供給部品で、すくなくとも一組の隣り合う半導体装置の外周側の電極を結合したことを特徴とする請求項12に記載のインバータ装置
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Also Published As
Publication number | Publication date |
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EP2720263A1 (en) | 2014-04-16 |
US9401319B2 (en) | 2016-07-26 |
CN103503132B (zh) | 2016-06-01 |
EP2720263A4 (en) | 2015-04-22 |
US20130307130A1 (en) | 2013-11-21 |
CN103503132A (zh) | 2014-01-08 |
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