WO2015151235A1 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- WO2015151235A1 WO2015151235A1 PCT/JP2014/059679 JP2014059679W WO2015151235A1 WO 2015151235 A1 WO2015151235 A1 WO 2015151235A1 JP 2014059679 W JP2014059679 W JP 2014059679W WO 2015151235 A1 WO2015151235 A1 WO 2015151235A1
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- resin
- plate
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- circuit board
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/492—Bases or plates or solder therefor
- H01L23/4924—Bases or plates or solder therefor characterised by the materials
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- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/16—Fillings or auxiliary members in containers or encapsulations, e.g. centering rings
- H01L23/18—Fillings characterised by the material, its physical or chemical properties, or its arrangement within the complete device
- H01L23/24—Fillings characterised by the material, its physical or chemical properties, or its arrangement within the complete device solid or gel at the normal operating temperature of the device
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3157—Partial encapsulation or coating
- H01L23/3178—Coating or filling in grooves made in the semiconductor body
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4006—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
- H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
- H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
- H01L23/49838—Geometry or layout
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/538—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames the interconnection structure between a plurality of semiconductor chips being formed on, or in, insulating substrates
- H01L23/5385—Assembly of a plurality of insulating substrates
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- H01L25/03—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/07—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10D, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group subclass H10D
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- H01L25/18—Assemblies consisting of a plurality of semiconductor or other solid state devices the devices being of the types provided for in two or more different main groups of the same subclass of H10B, H10D, H10F, H10H, H10K or H10N
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- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/02—Containers; Seals
- H01L23/04—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls
- H01L23/053—Containers; Seals characterised by the shape of the container or parts, e.g. caps, walls the container being a hollow construction and having an insulating or insulated base as a mounting for the semiconductor body
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- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
- H01L23/3735—Laminates or multilayers, e.g. direct bond copper ceramic substrates
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1305—Bipolar Junction Transistor [BJT]
- H01L2924/13055—Insulated gate bipolar transistor [IGBT]
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
- H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
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- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention relates to a semiconductor device such as a power semiconductor module.
- Patent Document 1 In a power semiconductor module in which a semiconductor element is mounted on an insulating substrate, the electrode of the semiconductor element and the circuit board of the insulating substrate are electrically connected by a bonding wire.
- Patent Document 2 In recent years, power semiconductor modules using conductive posts instead of bonding wires have been known (Patent Document 1 and Patent Document 2).
- a power semiconductor module using a conductive post one end of a conductive post is attached to an electrode of a semiconductor element, and one end of another conductive post is also attached to a circuit board of an insulating substrate. Further, the other end portions of these conductive posts are connected to a wiring film of a printed board provided to face an insulating substrate to which a semiconductor element is fixed.
- a power semiconductor module having such a configuration can be reduced in size as compared with a power semiconductor module having a bonding wire. And there exists an advantage that the inductance of wiring can be made small and it can respond to high-speed switching.
- the resin case containing the semiconductor element and the insulating substrate is filled with silicone gel and sealed.
- a power semiconductor module in which a semiconductor element and an insulating substrate are sealed with a transfer-molded insulating thermosetting resin is known.
- various members such as internal semiconductor elements and printed circuit boards can be fixed by resin. For this reason, the reliability with respect to the power cycle at the time of use of a power semiconductor module is high.
- the heat radiating surface of the power semiconductor module is screwed to the mounting surface of a flat facility, stress is applied to the power semiconductor module in a direction to straighten the heat radiating surface. Such stress was not preferable from the viewpoint of reliability. Further, when the process of flattening the heat radiation surface of the power semiconductor module is additionally performed, the above stress is not applied when the power semiconductor module is attached. However, even in this case, during the operation of the power semiconductor module, the heat radiation surface of the power semiconductor module is repeatedly deformed due to the temperature change of the package due to repeated heat generation of the semiconductor element.
- the amount of filler added to the resin is increased to reduce the linear expansion coefficient of the sealing resin, or the resin thickness is increased to increase the rigidity, thereby reducing deformation. It is also possible. However, it is difficult for the resin used for the power semiconductor module to have the same linear expansion coefficient as that of the ceramic insulating plate of the insulating substrate even if the filler amount is increased. Further, there is a limit to increasing the thickness of the resin because it is against the downsizing of the package. Therefore, a warp of about several tens of ⁇ m to 100 ⁇ m usually occurred.
- a compound or heat dissipation sheet having a thickness of about 100 ⁇ m or more is formed between the installation surface of the equipment and the heat dissipation surface of the power semiconductor module, the problem caused by the warpage of the heat dissipation surface can be improved to some extent.
- the compound or the heat dissipation sheet is thick, the heat dissipation performance decreases. Power semiconductor modules that are downsized and have a reduced heat dissipation area on the heat dissipation surface cannot achieve sufficient heat dissipation unless the thickness of the compound or heat dissipation sheet is reduced to about 25 to 50 ⁇ m. For this reason, there may be a case where the temperature of the semiconductor element cannot be equal to that of a large-sized power semiconductor module manufactured using a bonding wire.
- the insulating performance of the resin insulating plate is lower than that of the ceramic insulating plate. Or the increase in thermal resistance is several times.
- the present invention has been made in view of such circumstances, and the object thereof is to suppress warpage and thermal deformation of a semiconductor device having an insulating substrate and having a small and molded resin-encapsulated structure.
- An object of the present invention is to provide a semiconductor device capable of increasing the reliability of an attached semiconductor device, suppressing extrusion of the compound, and reducing the thermal resistance of the entire cooling system by reducing the thickness of the compound.
- a semiconductor device includes an insulating board made of ceramics, an insulating board having a circuit board fixed to the main surface of the insulating board, and a semiconductor fixed to the circuit board.
- An element a printed circuit board provided opposite to the main surface of the insulating plate, and a ceramic plate provided opposite to the main surface of the insulating plate and further away from the main surface of the insulating plate than the printed circuit board.
- a support member that is fixed to the main surface of the insulating plate or the circuit board and fixes the position of the ceramic board; and a resin that covers the circuit board, the semiconductor element, the printed circuit board, and the ceramic board. It is characterized by.
- the ceramic plate is provided opposite to the main surface of the insulating plate of the insulating substrate and further away from the main surface of the insulating plate than the printed circuit board, the heat radiation surface warpage and heat of the power semiconductor module are provided. Deformation can be suppressed, and as a result, the reliability of the semiconductor device can be increased, and the thermal resistance of the entire cooling system can be reduced.
- FIG. 1 is a perspective view of a power semiconductor module which is an embodiment of the semiconductor device of the present invention.
- 2 is a cross-sectional view of the power semiconductor module shown in FIG. 1 taken along line II-II.
- FIG. 3 is a perspective view showing members inside the power semiconductor module according to the embodiment of the present invention.
- FIG. 4 is an explanatory diagram of an example of the external connection terminal.
- FIG. 5 is a perspective view showing members inside a power semiconductor module according to another embodiment of the present invention.
- FIG. 6 is a perspective view showing members inside a power semiconductor module according to another embodiment of the present invention.
- FIG. 7 is a schematic cross-sectional view of power semiconductor modules of Examples 1 to 3 and a comparative example.
- FIG. 8 is a schematic cross-sectional view of the power semiconductor modules of Examples 4 to 6.
- FIG. 9 is a graph showing the relationship between the position of the ceramic plate and the amount of warpage in the power semiconductor modules of Examples 1 to 6 and Comparative Example.
- FIG. 10 is a cross-sectional view of a conventional power semiconductor module.
- FIG. 1 is a perspective view of a power semiconductor module 1 which is an embodiment of a semiconductor device of the present invention.
- FIG. 1A is a perspective view of the power semiconductor module 1 as viewed from the side from which the external connection terminals 12 protrude
- FIG. 1B is a perspective view of the heat dissipation surface as viewed.
- the illustrated power semiconductor module 1 is a substantially rectangular parallelepiped, and two insulating substrates 11 are provided on a first surface (heat radiation surface) 10a of a resin 10 so that the metal plate 11b is exposed. Since the first surface 10a of the resin 10 is not separately provided with a copper plate for heat diffusion, the power semiconductor module 1 is lightweight and inexpensive.
- a plurality of external connection terminals 12 are provided so as to protrude from the inside of the resin 10 on the second surface 10b that is substantially parallel to the first surface 10a of the resin 10 and is disposed at the opposite position.
- the illustrated example shows a 2-in-1 power semiconductor module.
- Screw holes 10c are formed at both ends in the longitudinal direction of the power semiconductor module 1 for screwing the module to the installation surface of the equipment.
- an insulating wall 10d is formed around the screw hole 10c on the second surface 10b of the power semiconductor module 1.
- FIG. 2 shows a cross-sectional view of the power semiconductor module 1 taken along line II-II.
- An insulating substrate 11 is provided on substantially the same plane as the first surface 10 a of the resin 10.
- the insulating substrate 11 includes an insulating plate 11a made of ceramics, a metal plate 11b, and a circuit board 11c.
- the circuit board 11c is fixed to the main surface of the insulating plate 11a.
- the metal plate 11 b is fixed to the surface opposite to the main surface of the insulating plate 11 a and is exposed from the first surface 10 a of the resin 10.
- the insulating plate 11a is made of a ceramic having a relatively high thermal conductivity such as Al 2 O 3 , AlN, or Si 3 N 4 .
- an AMB (Active Metal Brazed copper) substrate obtained by brazing an insulating plate 11a and a copper plate which is a material of the metal plate 11b and the circuit board 11c and patterning the copper plate by etching can be used.
- the insulating substrate 11 may be a DCB (Direct Copper Bond) substrate obtained by direct bonding of the insulating plate 11a and the copper plate constituting the metal plate 11b and the circuit board 11c.
- the thickness of the metal plate 11b and the circuit board 11c of the insulating substrate 11 is desirably 0.5 mm or more in consideration of thermal diffusibility and terminal matching.
- the thick copper plate may be directly bonded to the insulating plate 11a and then etched.
- the copper block may be bonded by diffusion bonding or sintering.
- the semiconductor element 13 is fixed to a circuit board 11c disposed on the main surface of the insulating plate 11a by a conductive bonding material (not shown) such as solder.
- the semiconductor element 13 is a switching element such as an IGBT (Insulated Gate Bipolar Transistor) or a power MOSFET, or a diode such as an FWD (Reflux Diode).
- a so-called 2-in-1 power semiconductor module is configured by such a combination of a switching element and a diode.
- a plurality of switching elements or diodes are also mounted on the circuit board 11 c behind the semiconductor element 13.
- the external connection terminals 12 are fixed to a circuit board 11c disposed on the main surface of the insulating plate 11a by a conductive bonding material (not shown) such as solder.
- a conductive bonding material such as solder.
- the external connection terminal 12 is preferably formed with a convex portion and / or a concave portion on a part of its surface to cause an anchor effect on the resin 10.
- the bonding material for fixing the external connection terminal 12 and the semiconductor element 13 to the circuit board 11c may be a metal sintered material or the like, and is not limited to solder.
- One end of the conductive post 14 is fixed on a surface of the semiconductor element 13 on the side opposite to the surface to be bonded to the circuit board 11c by a bonding material such as solder and is electrically connected.
- one end of another conductive post 14 is fixed to the circuit board 11c by a bonding material such as solder and is electrically connected.
- the other end portions of these conductive posts are electrically and mechanically connected to a wiring film of a printed board 15 described later.
- the conductive post 14 is made of a conductive material such as copper. It is preferable to provide a plurality of conductive posts 14 for each electrode of the semiconductor element 13 because a larger current can flow than in the case of one.
- a printed circuit board 15 is provided facing the main surface of the insulating plate 11a to which the circuit board 11c is fixed.
- the other end of the conductive post 14 described above is fixed to a wiring film of the printed board 15 by a bonding material such as solder and is electrically connected.
- Wiring by the conductive posts 14 and the printed circuit board 15 is used in place of conventional bonding wires.
- the power semiconductor module 1 of this embodiment can be reduced in size compared with the module using the conventional wire bonding.
- the inductance of the wiring can be made smaller than before, it is possible to cope with high-speed switching.
- the conductive post 14 is electrically and mechanically connected to the printed circuit board by soldering or remelting of the post surface while penetrating through the through hole of the printed circuit board 15. For this reason, it is preferable to set it as the structure of the printed circuit board with a conductive post before the assembly of the power semiconductor module 1.
- the printed circuit board 15 is not particularly limited as long as it is a generally available substrate on which a wiring film having a thickness of about several tens of ⁇ m to 100 ⁇ m is formed. However, considering the temperature at the time of joining, high temperature use after shipment, temperature at the time of molding, and moldability, a material having high heat resistance and a thin insulating portion, such as a flexible printed circuit board (FPC) made of polyimide resin, is desirable. .
- FPC flexible printed circuit board
- a ceramic plate 16 is provided at a position facing the main surface of the insulating plate 11a to which the circuit board 11c is fixed and being further away from the main surface of the insulating plate 11a than the printed board 15.
- a resin 10 that covers the circuit board 11c, the semiconductor element 13, the printed board 15, and the ceramic board 16 is disposed.
- the resin 10 has the first surface 10a that is substantially flush with the insulating substrate 11, and the second surface 10b that is substantially parallel to the first surface 10a.
- a thermosetting resin composed of an epoxy resin, a polyimide resin, a silicone resin, a phenol resin, an amino resin, or the like can be used.
- the ceramic plate 16 is provided near the second surface 10b of the resin 10, so that the linear expansion coefficient in the first surface 10a portion of the resin 10 and the linear expansion coefficient in the second surface 10b portion are approximately the same. be able to. Accordingly, when the power semiconductor module 1 is manufactured, when the resin 10 thermally contracts after molding, the first surface 10a is curved because the first surface 10a and the second surface 10b have the same amount of thermal contraction. It can suppress warping. Therefore, even if the power semiconductor module 1 is screwed to the mounting surface of a flat facility, the stress that corrects the warp is reduced, so that the power semiconductor module 1 has high reliability.
- the first surface 10a and the second surface 10b have the same amount of thermal expansion and contraction, so It can suppress that the stress by a power cycle is added. That is, since the thermal deformation of the resin 10 can be suppressed, the power semiconductor module 1 is also highly reliable in this respect. Furthermore, since the compound provided between the installation surface of the facility and the power semiconductor module 1 can be prevented from being pushed out due to thermal deformation during use, the reliability is also high in this respect.
- the power semiconductor module 1 can suppress warping of the first surface 10a of the resin 10 even after manufacture and during use, and therefore, it is not necessary to process the first surface 10a. Moreover, there is no restriction
- the warp is eliminated by using the ceramic plate 16, it is not necessary to change the insulating plate 11a of the insulating substrate 11 to a resin insulating plate. For this reason, a decrease in insulation resistance and an increase in thermal resistance caused when a resin insulating plate is used are not caused.
- the material of the ceramic plate 16 is not particularly limited, and there is no particular problem as long as the linear expansion coefficient of the ceramic plate 16 is closer to the material of the insulating plate 11a than the resin 10 and is strong against bending and stress. Moreover, since it is the same as the material of the insulating plate 11a, since a linear expansion coefficient is the same, it is more preferable. As will be described later, in the present embodiment, since the ceramic plate 16 is supported or fixed by the external connection terminals 12, the ceramic plate 16 preferably has an insulating property. Further, the ceramic plate 16 may be a single ceramic, or an AMB substrate or DBC substrate having a conductive layer on one surface or both surfaces.
- a means for holding the position of the ceramic plate 16 is required regardless of the resin flow at the time of molding when the power semiconductor module 1 is manufactured.
- the position of the ceramic board 16 is hold
- FIG. 3 is a perspective view showing members inside the power semiconductor module 1 of the present embodiment excluding the resin 10.
- two ceramic plates 16 corresponding to each of the two insulating substrates 11 are provided.
- Each ceramic plate 16 has a substantially rectangular planar shape, and the size and thickness are substantially the same as the size and thickness of the insulating plate 11 a of the insulating substrate 11.
- a plurality of through holes 16 a corresponding to the positions of the external connection terminals 12 are formed in the periphery of each ceramic plate 16.
- the hole diameter of the through hole 16 a is a diameter through which the external connection terminal 12 can be passed.
- FIG. 4 shows an example of the external connection terminal 12 that functions as a support member for fixing the ceramic plate 16 in the present embodiment.
- the external connection terminal 12A shown in FIG. 4A has a protrusion 12Aa at a predetermined position.
- the protrusion 12Aa has a cross shape in its cross section, as shown in FIG. 4C, which is a cross sectional view perpendicular to the central axis of the external connection terminal 12A.
- the maximum protruding length in the diameter direction of the external connection terminal 12 in the protrusion 12Aa is larger than the diameter of the through hole 16a formed in the ceramic plate 16.
- the ceramic plate 16 is locked at the position of the protrusion 12Aa of the external connection terminal 12A. Thereby, the position of the ceramic plate 16 can be fixed.
- the printed board 15 has lower rigidity than the insulating board 11, the ceramic plate 16 cannot be firmly fixed. For this reason, when the resin is injected into the mold by molding, the ceramic plate 16 may move, and the position of the ceramic plate 16 may vary.
- the position of the ceramic plate 16 is fixed using the highly rigid insulating substrate 11, the above problem does not occur, and the highly reliable power semiconductor module 1 can be manufactured stably.
- the external connection terminal 12 as a support member as described above, it is not necessary to prepare a support member separately, so that the manufacturing cost can be reduced.
- a dedicated member having the structure shown in FIG. 4 can be used instead of using the external connection terminal 12 as a support member.
- the support member can be fixed to the main surface of the insulating plate 11a instead of being fixed to the circuit board 11c. In these cases, since the support member can be arranged independently of the external connection terminals, the degree of freedom of the internal structure of the power semiconductor module 1 can be increased.
- the protrusion 12Aa of the external connection terminal 12A shown in FIGS. 4A and 4C can be formed, for example, by drawing at a specific position of the external connection terminal 12A.
- the protrusion 12 ⁇ / b> Aa can be formed by fixing a separately prepared locking member to the external connection terminal 12.
- the protrusion 12Aa of the external connection terminal 12A is not limited to the cross shape shown in FIG.
- the shape of the protrusion 12Aa in the cross section perpendicular to the central axis is arbitrary, and in short, the maximum protrusion length in the diameter direction only needs to be larger than the diameter of the through hole 16a of the ceramic plate 16.
- the external connection terminal 12B shown in FIG. 4 (b) is another example of the external connection terminal 12.
- the external connection terminal 12B is different from the external connection terminal 12A shown in FIG. 4A in the shape of the protrusion 12Ba.
- the protrusion 12Ba formed at a specific position in the entire length of the external connection terminal 12B has a cross shape in a cross section perpendicular to the central axis.
- the maximum protruding length in the diameter direction of the external connection terminal 12 in the protrusion 12Ba is slightly larger than the diameter of the through hole 16a formed in the ceramic plate 16.
- the protrusion 12Ba has a size capable of being press-fitted into the through hole 16a, or a size capable of locking the ceramic plate 16 by a frictional force with the through hole 16a by being pressed against the through hole 16a. It is. Therefore, the ceramic plate 16 is locked at the position of the protrusion 12Ba of the external connection terminal 12B by passing the through hole 16a of the ceramic plate 16 from one end of the external connection terminal 12B and press-fitting or pressing the protrusion 12Ba. The Thereby, the position of the ceramic plate 16 can be fixed.
- the external connection terminal 12B shown in FIG. 4 (b) is advantageously used when a highly viscous resin is used as the resin 10 and the position of the ceramic plate 16 may be fluctuated due to resin flow in the mold.
- the protrusion 12Ba of the external connection terminal 12B can be formed by performing a drawing process at a specific position of the external connection terminal 12B, similarly to the protrusion 12Aa of the external connection terminal 12A described above. Further, the protrusion 12Ba can be formed by fixing a separately prepared locking member to the external connection terminal 12.
- the protrusion 12Ba of the external connection terminal 12B is not limited to a cross shape. The shape of the protrusion 12Ba in the cross section perpendicular to the central axis is arbitrary. In short, the maximum protruding length in the diameter direction is slightly larger than the diameter of the through-hole 16a, and the size or pressure that can be press-fitted into the through-hole 16a. As long as the frictional force is generated by the above, it is sufficient.
- the external connection terminals 12, 12A, 12B are preferably made of a copper material in order to lower the electrical resistance, and can be further subjected to conductive plating if necessary. Since the copper material is relatively soft and can be plastically deformed, the drawing of the protrusions 12Aa and 12Ba is easy. In addition, the ceramic plate 16 can be easily locked by press-fitting or pressing into the through hole 16a. In addition, when a dedicated member other than the external connection terminal 12 is used as the support member, a material other than a copper material may be used. In this case as well, it is preferable to use a material that easily undergoes plastic deformation.
- the position at which the ceramic plate 16 is fixed by the support member is the position of the resin 10 relative to the distance from the first surface 10a of the resin 10 to the center of the insulating plate 11a in the thickness direction of the insulating substrate 11a.
- the ratio of the distance from the second surface 10b to the center of the ceramic plate 16 in the thickness direction is preferably in the range of 1-5. This is because the linear expansion coefficient of the first surface 10a portion and the second surface 10b portion of the resin 10 can be made closer by setting the numerical value range, and the warpage can be reliably suppressed. More preferably, the ratio is in the range of 1 to 4, and more preferably, the ratio is approximately 1.
- the above ratio of 1 means that the distance from the first surface 10a of the resin 10 to the insulating plate 11a and the distance from the second surface 10b of the resin 10 to the ceramic plate 16 are approximately the same. means.
- the parameters such as the ratio, the material of the ceramic plate 16, the planar shape, the planar size, and the thickness are appropriately adjusted. Is good.
- the insulating plate 11a and the ceramic plate 16 are not the same material, the same thickness, and the same shape, it is preferable to adjust the above parameters.
- the ceramic plate 16 may be a single plate having a size covering the two insulating substrates 11.
- the rigidity of the ceramic plate 16 can be improved as compared with the case where two pieces are provided. Therefore, it is possible to more effectively suppress warping of the first surface 10a of the resin 10.
- the power semiconductor module 1 of the present embodiment has a so-called full mold type structure. Since each member is fixed by the sealing resin and the stress applied to the bonding material joining the members is suppressed, the reliability with respect to the power cycle and the like is extremely high.
- FIG. 5 is a perspective view corresponding to FIG. 3 illustrating the semiconductor device of the above-described embodiment. Further, in FIG. 5, the same members as those described above are denoted by the same reference numerals, and redundant description is omitted below.
- the ceramic plate 16A of FIG. 5 and the ceramic plate 16 of FIG. 3 have different planar shapes, and the other configurations are the same as those of FIGS.
- the ceramic plate 16 ⁇ / b> A shown in FIG. 5 has a planar shape in which a portion where the external connection terminal 12 is located is cut away so as to avoid the external connection terminal 12.
- the position of the ceramic plate 16A can be fixed by the protrusion 12Aa of the external connection terminal 12A or the protrusion 12Ba of the external connection terminal 12B shown in FIG.
- the ceramic plate 16A of FIG. 5 has the same effect as the ceramic plate 16 of the previous embodiment shown in FIG. This embodiment is particularly effective when a ceramic material that is difficult to form a hole shape is used for the ceramic plate 16.
- FIG. 6 is a perspective view corresponding to FIG. 3 for explaining the semiconductor device of the above-described embodiment.
- the same members as those described above are denoted by the same reference numerals, and redundant description will be omitted below.
- the ceramic plate 16B of FIG. 6 and the ceramic plate 16 of FIG. 3 have a different planar shape, and otherwise, FIG. 6 and FIG. 3 have the same configuration.
- the ceramic plate 16B shown in FIG. 6 has a resin inflow hole 16b at the center.
- the resin inflow holes 16 b are advantageous for allowing the resin to flow between the members between the ceramic plate 16 and the insulating substrate 11 when molding the power semiconductor module 1. Moreover, it is useful for improving the adhesive strength between the ceramic plate 16 and the resin.
- the size, position, number, and the like of the resin inflow holes 16b can be appropriately determined in consideration of the rigidity required for the ceramic plate 16B.
- the semiconductor element 13 is fixed to the circuit board 11c disposed on the main surface of the insulating plate 11a with a bonding material.
- the conductive post 14 of the printed circuit board 15 with the conductive post 14 prepared in advance is aligned with the electrode of the semiconductor element 13 and the circuit board 11c of the insulating substrate 11 and fixed with a bonding material.
- the connection between the semiconductor element 13 and the circuit board 11c and the printed board 15 with the conductive post 14 may be performed simultaneously with the connection between the insulating substrate 11 and the semiconductor element 13 or may be performed in a separate process.
- the external connection terminal 12 is fixed to the circuit board 11c disposed on the main surface of the insulating plate 11a with a bonding material.
- the ceramic plate 16 is locked to the external connection terminal 12 to be fixed at a distance from the printed board 15.
- This assembly is set in a mold, and a resin 10 that is a thermosetting resin is filled in the mold and cured.
- the temperature for curing the resin is, for example, about 150 to 250 ° C.
- FIG. 10 a conventional power semiconductor module 100 is shown in FIG. 10 in a sectional view corresponding to the sectional view 2 of the embodiment of the present invention shown in FIG.
- Reference numeral b denotes a bolt for screwing the power semiconductor module 100.
- the power semiconductor module 100 shown in FIG. 10 is different from the power semiconductor module 1 shown in FIG. 2 in that it does not have the ceramic plate 16. Since the ceramic plate 16 is not provided, the first surface 10a of the resin 10 is easily warped, and the amount of warpage is large.
- the power semiconductor module 1 having the configuration shown in FIG. 2 three types of power semiconductor modules 1A to 1C in which the distance of the ceramic plate 16 from the second surface 10b of the resin 10 was changed were prepared, and the degree of warpage was examined. . Further, regarding the ceramic plate 16, three types of power semiconductor modules 1D to 1D are used in which a single plate having a size covering the two insulating substrates 11 is used and the distance of the ceramic plate 16 from the second surface 10b of the resin 10 is changed. 1F was prepared and the degree of warpage was examined. Furthermore, a conventional power semiconductor module 100 having no ceramic plate 16 was prepared, and the degree of warpage was examined.
- a power semiconductor module 100 of a comparative example shown in a schematic cross-sectional view in FIG. 7A is an example in which the ceramic plate 16 is not provided.
- the power semiconductor module 1A of the first embodiment shown in a schematic cross-sectional view in FIG. 7B is an example in which the distance from the second surface 10b of the resin 10 to the ceramic plate 16 is large.
- the power semiconductor module 1B of Example 2 shown in a schematic cross-sectional view in FIG. 7C is an example in which the distance from the second surface 10b of the resin 10 to the ceramic plate 16 is medium.
- the power semiconductor module 1C of Example 3 shown in a schematic cross-sectional view in FIG. 7D is an example in which the distance from the second surface 10b of the resin 10 to the ceramic plate 16 is small.
- the power semiconductor module 1D of Example 4 shown in a schematic cross-sectional view in FIG. 8A is a single plate having a size in which the ceramic plate 16 covers the two insulating substrates 11, and the second surface 10 b of the resin 10. This is an example in which the distance from the ceramic plate 16 to the ceramic plate 16 is large.
- the power semiconductor module 1E of Example 5 shown in a schematic cross-sectional view in FIG. 8B is a single plate having a size that the ceramic plate 16 covers the two insulating substrates 11, and the second surface 10b of the resin 10. This is an example in which the distance from the ceramic plate 16 is medium.
- a power semiconductor module 1F of Example 6 shown in a schematic cross-sectional view in FIG. 8C is a single plate having a size in which the ceramic plate 16 covers the two insulating substrates 11, and the second surface 10 b of the resin 10. This is an example in which the distance from the ceramic plate 16 to the ceramic plate 16 is small.
- the degree of warpage was evaluated based on the distance of the longitudinal end of the resin 10 from the flat surface.
- the warpage L2 of the power semiconductor module 1B of the second embodiment is smaller than the warpage L1 of the power semiconductor module 1A of the first embodiment as compared with the first to third embodiments
- the power semiconductor module 1C of the third embodiment is smaller than the warpage L2.
- the warpage L3 was small.
- the warpage L5 of the power semiconductor module 1E of the fifth embodiment is smaller than the warpage L4 of the power semiconductor module 1D of the fourth embodiment
- the power semiconductor module 1F of the sixth embodiment is smaller than the warpage L5.
- Warpage L6 was small. Note that the power semiconductor module 1F of Example 6 was warped in the opposite direction to the other power semiconductor modules 1A to 1E.
- the warp L0 of the power semiconductor module 100 of the comparative example was greater than the warp L0 of the power semiconductor modules 1B, 1C, 1E, and 1F of Examples 2, 3, and Examples 5 and 6.
- FIG. 9 shows the distance from the second surface 10b of the resin 10 to the ceramic plate with respect to the distance from the first surface 10a of the resin 10 to the insulating plate 11a of the insulating substrate 11 for Examples 1 to 6 and the power semiconductor module.
- the graph shows the results with the ratio on the horizontal axis and the amount of warpage on the vertical axis.
- the warpage amount on the vertical axis of the graph is indicated by a relative numerical value of the warpage amount of each power semiconductor module.
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Abstract
Description
図1は、本発明の半導体装置の一実施形態であるパワー半導体モジュール1の斜視図である。図1(a)はパワー半導体モジュール1の外部接続端子12が突出した側を見た斜視図であり、図1(b)は放熱面側を見た斜視図である。図示したパワー半導体モジュール1は略直方体であり、樹脂10の第1面(放熱面)10aに、2個の絶縁基板11が、その金属板11bが露出するように設けられている。樹脂10の第1面10aには、熱拡散用の銅板を別途に備えていないので、パワー半導体モジュール1は軽量安価なものである。
絶縁板11aは、Al2O3やAlN、Si3N4などの比較的熱伝導率の高いセラミックスで構成される。
また回路板11c、半導体素子13、プリント基板15及びセラミックス板16を被覆する樹脂10が配置されている。樹脂10は前述のように絶縁基板11と略同一平面である第1面10aと、それと略平行である第2面10bを有する。樹脂10はエポキシ樹脂、ポリイミド樹脂、シリコーン樹脂、フェノール樹脂およびアミノ樹脂などにより構成された熱硬化性樹脂を用いることができる。
そしてセラミックス板16が、樹脂10の第2面10bの近くに設けられることにより、樹脂10の第1面10a部分における線膨張係数と、第2面10b部分における線膨張係数とを同程度とすることができる。よって、パワー半導体モジュール1の製造時において、モールド成型した後に樹脂10が熱収縮するとき、第1面10a部分と第2面10b部分と熱収縮量が同等になるから、第1面10aが曲面状に反ることを抑制することができる。よって、平坦な設備の取り付け面にパワー半導体モジュール1をねじ止めしても、反りを矯正するような応力が低減されるので、パワー半導体モジュール1は信頼性が高い。
また、セラミックス板16を用いて反りを解消していることから、絶縁基板11の絶縁板11aを樹脂製の絶縁板に変更する必要がない。このため、樹脂製の絶縁板を用いた場合に生じる絶縁抵抗の低下や熱抵抗の上昇を招かない。
本実施形態のように支持部材を絶縁基板11に固定するのではなく、プリント基板15に固定してセラミックス板16の位置を固定することも考えられる。しかしながら、プリント基板15は絶縁基板11に比べて剛性が低いため、セラミックス板16をしっかりと固定することができない。このためモールド成型で樹脂を金型に注入した際にセラミックス板16が動いてしまい、セラミックス板16の位置にバラつきが生じる恐れがある。一方本実施形態では、剛性の高い絶縁基板11を用いてセラミックス板16の位置を固定しているので上記の問題は発生せず、信頼性の高いパワー半導体モジュール1が安定して製造できる。また上述のように外部接続端子12を支持部材として用いることにより、支持部材を別途用意する必要がないことから、製造コストを低減させることができる。
また支持部材として外部接続端子12を用いるのではなく、図4に示した構造を有する専用の部材を用いることもできる。さらに、支持部材を回路板11cに固定するのではなく、絶縁板11aの主面に固定することもできる。これらの場合は、支持部材を外部接続端子とは独立して配置することができるので、パワー半導体モジュール1の内部構造の自由度を高くすることができる。
また、支持部材として外部接続端子12以外の専用の部材を用いる場合には、銅材以外の材料を用いてもよい。この場合にも塑性変形しやすい材料を用いることが好ましい。
この実施形態は、孔形状の形成が困難なセラミックス材料をセラミックス板16に用いる場合に特に有効である。
絶縁板11aの主面に配置された回路板11cに、半導体素子13を接合材によって固定する。次に、あらかじめ用意された導電ポスト14付きのプリント基板15の当該導電ポスト14を、半導体素子13の電極と、絶縁基板11の回路板11cに位置合わせして、接合材によって固定する。半導体素子13及び回路板11cと、導電ポスト14付きのプリント基板15との接続は、絶縁基板11と半導体素子13との接続と同時でもよいし、別工程でもよい。
図10に示すパワー半導体モジュール100は、セラミックス板16を有していない点で図2に示したパワー半導体モジュール1とは相違する。セラミックス板16を有していないために、樹脂10の第1面10aには反りが生じ易く、反りの量が大きい構成になっている。
図7(b)に模式的な断面図で示す実施例1のパワー半導体モジュール1Aは、樹脂10の第2面10bからセラミックス板16までの距離が大きい例である。
図7(c)に模式的な断面図で示す実施例2のパワー半導体モジュール1Bは、樹脂10の第2面10bからセラミックス板16までの距離が中程度の例である。
図7(d)に模式的な断面図で示す実施例3のパワー半導体モジュール1Cは、樹脂10の第2面10bからセラミックス板16までの距離が小さい例である。
図8(a)に模式的な断面図で示す実施例4のパワー半導体モジュール1Dは、セラミックス板16が2個の絶縁基板11を覆う大きさの単板であり、樹脂10の第2面10bからセラミックス板16までの距離が大きい例である。
図8(b)に模式的な断面図で示す実施例5のパワー半導体モジュール1Eは、セラミックス板16が2個の絶縁基板11を覆う大きさの単板であり、樹脂10の第2面10bからセラミックス板16までの距離が中程度の例である。
図8(c)に模式的な断面図で示す実施例6のパワー半導体モジュール1Fは、セラミックス板16が2個の絶縁基板11を覆う大きさの単板であり、樹脂10の第2面10bからセラミックス板16までの距離が小さい例である。
その結果、実施例1~3で比べると実施例1のパワー半導体モジュール1Aの反りL1よりも実施例2のパワー半導体モジュール1Bの反りL2が小さく、反りL2よりも実施例3のパワー半導体モジュール1Cの反りL3が小さかった。また、実施例4~6で比べると実施例4のパワー半導体モジュール1Dの反りL4よりも実施例5のパワー半導体モジュール1Eの反りL5が小さく、反りL5よりも実施例6のパワー半導体モジュール1Fの反りL6が小さかった。なお、実施例6のパワー半導体モジュール1Fは、他のパワー半導体モジュール1A~1Eとは逆向きの反りが生じていた。比較例のパワー半導体モジュール100の反りL0は、実施例2、3、実施例5、6のパワー半導体モジュール1B、1C、1E、1Fよりも反りが大きかった。
10 樹脂
10a 第1面
10b 第2面
11 絶縁基板
11a 絶縁板
11b 金属板
11c 回路板
12、12A、12B 外部接続端子
12Aa、12Ba 突起部
13 半導体素子
14 導電ポスト
15 プリント基板
16、16A、16B セラミックス板
Claims (10)
- セラミックスで構成された絶縁板及び該絶縁板の主面に固定された回路板を有する絶縁基板と、
該回路板に固定された半導体素子と、
該絶縁板の主面に対向して設けられたプリント基板と、
該絶縁板の主面に対向し、該プリント基板よりも該絶縁板の主面から離れて設けられたセラミックス板と、
該絶縁板の主面もしくは該回路板に固定され、該セラミックス板の位置を固定する支持部材と、
該回路板、該半導体素子、該プリント基板及び該セラミックス板を被覆する樹脂と、
を備えることを特徴とする半導体装置。 - 前記支持部材は、該回路板に固定された外部接続端子である請求項1記載の半導体装置。
- 前記外部接続端子が、前記セラミックス板を固定する突起部を有する請求項2記載の半導体装置。
- 前記樹脂は前記絶縁基板と略同一平面である第1面と、該第1面と略平行である第2面を有し、
該絶縁板と該第1面との距離に対する、前記セラミックス板と該第2面との距離の比が1~5である請求項1記載の半導体装置。 - 前記セラミックス板が、前記絶縁板の材料と同じ線膨張係数を有する材料からなる請求項1記載の半導体装置。
- 前記樹脂はエポキシ樹脂、ポリイミド樹脂、シリコーン樹脂、フェノール樹脂およびアミノ樹脂よりなる群から選ばれる少なくとも1種類により構成される熱硬化性樹脂である請求項1記載の半導体装置。
- 前記半導体素子および前記プリント基板に電気的かつ機械的に接続された導電ポストを備える請求項1記載の半導体装置。
- 前記セラミックス板が、樹脂流入用孔を備える請求項1記載の半導体装置。
- 前記セラミックス板が、導電性層を備える請求項1記載の半導体装置。
- 前記セラミックス板が、単板である請求項1記載の半導体装置。
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| JP2016511253A JP6164364B2 (ja) | 2014-04-01 | 2014-04-01 | 半導体装置 |
| EP14888193.1A EP3043379B1 (en) | 2014-04-01 | 2014-04-01 | Semiconductor device |
| PCT/JP2014/059679 WO2015151235A1 (ja) | 2014-04-01 | 2014-04-01 | 半導体装置 |
| CN201480055064.XA CN105612613B (zh) | 2014-04-01 | 2014-04-01 | 半导体装置 |
| US15/092,069 US9559042B2 (en) | 2014-04-01 | 2016-04-06 | Semiconductor device |
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- 2014-04-01 CN CN201480055064.XA patent/CN105612613B/zh not_active Expired - Fee Related
- 2014-04-01 EP EP14888193.1A patent/EP3043379B1/en not_active Not-in-force
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2016
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018122897A1 (ja) * | 2016-12-26 | 2018-07-05 | 新電元工業株式会社 | 電子装置及び電子装置の製造方法 |
| US10347555B2 (en) | 2016-12-26 | 2019-07-09 | Shindengen Electric Manufacturing Co., Ltd. | Electronic device and method for manufacturing electronic device |
| JP6321891B1 (ja) * | 2016-12-26 | 2018-05-09 | 新電元工業株式会社 | 電子装置及び電子装置の製造方法 |
| JP7052426B2 (ja) | 2018-03-02 | 2022-04-12 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
| JP2019153699A (ja) * | 2018-03-02 | 2019-09-12 | 富士電機株式会社 | 半導体装置および半導体装置の製造方法 |
| US10991650B2 (en) | 2018-03-02 | 2021-04-27 | Fuji Electric Co., Ltd. | Semiconductor device and method of manufacturing semiconductor device |
| US11056475B2 (en) | 2018-09-14 | 2021-07-06 | Fuji Electric Co., Ltd. | Semiconductor module |
| JP2021019064A (ja) * | 2019-07-19 | 2021-02-15 | 富士電機株式会社 | 半導体装置及び半導体装置の製造方法 |
| JP7293936B2 (ja) | 2019-07-19 | 2023-06-20 | 富士電機株式会社 | 半導体装置及び半導体装置の製造方法 |
| JP2021077703A (ja) * | 2019-11-06 | 2021-05-20 | 富士電機株式会社 | 半導体装置及び半導体装置の製造方法 |
| US11756868B2 (en) | 2019-11-06 | 2023-09-12 | Fuji Electric Co., Ltd. | Semiconductor device and method for manufacturing the same |
| US12087655B2 (en) | 2020-01-10 | 2024-09-10 | Fuji Electric Co., Ltd. | Semiconductor apparatus and vehicle |
| US11191157B2 (en) | 2020-01-23 | 2021-11-30 | Fuji Electric Co., Ltd. | Semiconductor device having buffer structure for external terminals |
| DE102020214734A1 (de) | 2020-01-23 | 2021-07-29 | Fuji Electric Co., Ltd. | Halbleitervorrichtung |
| WO2022244392A1 (ja) | 2021-05-18 | 2022-11-24 | 富士電機株式会社 | 半導体装置及び半導体装置の製造方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6164364B2 (ja) | 2017-07-19 |
| JPWO2015151235A1 (ja) | 2017-04-13 |
| EP3043379B1 (en) | 2020-08-05 |
| CN105612613B (zh) | 2018-11-06 |
| CN105612613A (zh) | 2016-05-25 |
| EP3043379A4 (en) | 2017-08-02 |
| US20160233146A1 (en) | 2016-08-11 |
| EP3043379A1 (en) | 2016-07-13 |
| US9559042B2 (en) | 2017-01-31 |
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