JP5991253B2 - Resin-sealed power module and mold - Google Patents

Resin-sealed power module and mold Download PDF

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JP5991253B2
JP5991253B2 JP2013073208A JP2013073208A JP5991253B2 JP 5991253 B2 JP5991253 B2 JP 5991253B2 JP 2013073208 A JP2013073208 A JP 2013073208A JP 2013073208 A JP2013073208 A JP 2013073208A JP 5991253 B2 JP5991253 B2 JP 5991253B2
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resin
mold
power module
molding die
cavity
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JP2014197639A (en
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利弥 只熊
利弥 只熊
武敏 鹿野
武敏 鹿野
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
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    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—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
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
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    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
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    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
    • H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
    • H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
    • H01L2224/48139—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate with an intermediate bond, e.g. continuous wire daisy chain
    • H—ELECTRICITY
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    • H01L2224/01—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
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/481—Disposition
    • H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
    • H—ELECTRICITY
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    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • 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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    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • 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
    • H01L2924/1306—Field-effect transistor [FET]
    • H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
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    • H01L2924/181—Encapsulation

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Description

この発明は、樹脂封止型パワーモジュール及びそれを製造するための成形金型に係り、特に上出し電極用金属製電極端子をベース板に対し直立するように配置する樹脂封止型パワーモジュールに関するものである。   The present invention relates to a resin-sealed power module and a molding die for manufacturing the same, and more particularly to a resin-sealed power module in which metal electrode terminals for protruding electrodes are arranged so as to stand upright with respect to a base plate. Is.

パワーモジュールのパッケージは、製造コストや生産性などの観点からトランスファーモールド成形による樹脂封止で形成されることが多い。トランスファーモールド成形では、樹脂組成物（モールド樹脂）が必要に応じて溶融され、高温に保たれた金属成形金型内部の空洞（キャビティ）内に充填される。成形金型は、一般に上金型とこれに組み合わされる下金型からなり、キャビティは上金型と下金型の内壁により規定される。モールド樹脂の充填とその後に行われるモールド樹脂の加圧にはプランジャーが用いられ、モールド樹脂が加熱溶融しキャビティ内に充填された後、硬化される。型締めが行われた状態でキャビティへモールド樹脂が充填された後は、周知の方法によりモールド樹脂により樹脂封止されたパワーモジュールが製造される。   The power module package is often formed by resin sealing by transfer molding from the viewpoint of manufacturing cost and productivity. In transfer molding, a resin composition (molding resin) is melted as necessary and filled into a cavity (cavity) inside a metal molding die maintained at a high temperature. The molding die is generally composed of an upper die and a lower die combined therewith, and the cavity is defined by the upper die and the inner wall of the lower die. A plunger is used to fill the mold resin and pressurize the mold resin thereafter, and the mold resin is heated and melted and filled in the cavity, and then cured. After the mold resin is filled into the cavity in a state where the mold is clamped, a power module sealed with the mold resin is manufactured by a known method.

トランスファーモールド成形では、型締めされる際にリードフレームを代表とする金属性電極端子が上下金型と接触した状態で挟まれることによって、樹脂が封止された後も金属性電極端子は樹脂外部へ露出する。ここでいう金属製電極端子は、トランスファーモールド成形後にパッケージ外部へ露出し、パッケージ外部と電気的に接続される。一般にリードフレームを金属製電極端子として用いる場合、端子はモールド樹脂で成形されたパッケージの側面周辺から外部端子として形成される。しかし、複数のパッケージを高密度にプリント基板に実装し、システム及び半導体装置を小型化する観点からは、金属製電極端子をパッケージ側面（絶縁基板の表面と平行方向）に露出させるのではなく、パッケージ上面（絶縁基板の表面と垂直な方向）に露出させる方が良い。   In transfer molding, the metal electrode terminal represented by a lead frame is clamped in contact with the upper and lower molds when the mold is clamped, so that the metal electrode terminal remains outside the resin even after the resin is sealed. Exposed to. The metal electrode terminal here is exposed to the outside of the package after transfer molding and is electrically connected to the outside of the package. In general, when a lead frame is used as a metal electrode terminal, the terminal is formed as an external terminal from the periphery of a side surface of a package formed of a mold resin. However, from the viewpoint of mounting a plurality of packages on a printed circuit board with high density and downsizing the system and the semiconductor device, the metal electrode terminals are not exposed on the package side surface (parallel to the surface of the insulating substrate). It is better to expose the package upper surface (direction perpendicular to the surface of the insulating substrate).

特許文献１には、金属製電極端子がパッケージ上面方向に露出する構成が開示されている。特許文献１に記載のパワーモジュールを複数個配線接続する場合、接続工程の簡略化を目的として、しばしば特許文献２に記載されているようなインサートケースがパワーモジュールにセットされる。すなわち、インサートケースに設けられた外部端子のインサートケースの内面側に突出した部分が、パワーモジュールのインサートケースの上面に開口を有する筒状導通体に挿入接続される。   Patent Document 1 discloses a configuration in which metal electrode terminals are exposed in the package upper surface direction. When a plurality of power modules described in Patent Document 1 are connected by wiring, an insert case as described in Patent Document 2 is often set in the power module for the purpose of simplifying the connection process. That is, the portion of the external terminal provided on the insert case that protrudes to the inner surface side of the insert case is inserted and connected to a cylindrical conductor having an opening on the upper surface of the insert case of the power module.

特開２０１１−０４９３４３号公報 （図１）JP 2011-049343 A (FIG. 1) 特開２０１０−１２９７９７号公報 （図１）Japanese Patent Laying-Open No. 2010-129797 (FIG. 1)

このようなパワーモジュールは、特許文献１に記載されているように、ベース板の上に半導体素子や端子が配置された被封止物を成形金型のキャビティ内に設置し、キャビティ内にモールド樹脂を加圧充填することにより形成される。この際、リードフレームを金属製電極端子として用いるパワーモジュールの場合、リードフレームのパッケージ側面から露出する部分の上面を吸着し、成形金型のキャビティ内に被封止物を搬送すればよいが、特許文献１に開示された金属製電極端子がパッケージ上面方向に露出しているパワーモジュールの場合は、このような搬送方法を採用するためには、以下のような問題点があった。   In such a power module, as described in Patent Document 1, an object to be sealed in which semiconductor elements and terminals are arranged on a base plate is placed in a cavity of a molding die, and a mold is placed in the cavity. It is formed by pressure filling with resin. At this time, in the case of a power module that uses the lead frame as a metal electrode terminal, the upper surface of the portion exposed from the package side surface of the lead frame may be adsorbed, and the object to be sealed may be conveyed into the cavity of the molding die. In the case of a power module in which the metal electrode terminals disclosed in Patent Document 1 are exposed in the upper surface direction of the package, there are the following problems in order to employ such a transport method.

すなわち、金属製電極端子がパッケージ上面方向に露出しているパワーモジュールの場合は、回路パターンへのダメージを考慮してベース板の上面を吸着するという手段が採れず、搬送治具で被封止物のベース板をつかむ必要があるが、被封止物は下金型の底面に戴置されるため搬送治具も必然的に下金型のキャビティ内に入り込むこととなる。この場合、下金型のキャビティは搬送治具の挿入を考慮して大きめに作成しておく必要があるが、このことはパワーモジュールの外形の大型化を招くとともに、キャビティ内に加圧充填されるモールド樹脂が多量に必要となり材料コストの増大を招くこととなる。パワーモジュールの外形の大型化を避けようとすれば、成形金型のキャビティ内への被封止物の搬送をマニュアルで行わなければならず、製造コストの増大につながる。   In other words, in the case of a power module in which the metal electrode terminals are exposed in the upper surface direction of the package, it is not possible to take the means of adsorbing the upper surface of the base plate in consideration of damage to the circuit pattern. Although it is necessary to grasp the base plate of the object, since the object to be sealed is placed on the bottom surface of the lower mold, the conveying jig inevitably enters the cavity of the lower mold. In this case, it is necessary to make the cavity of the lower mold larger in consideration of the insertion of the conveying jig, but this leads to enlargement of the outer shape of the power module and pressurization filling in the cavity. As a result, a large amount of mold resin is required, resulting in an increase in material cost. If it is going to avoid the enlargement of the external shape of a power module, the to-be-sealed thing must be manually conveyed into the cavity of a molding die, leading to an increase in manufacturing cost.

この発明は上記のような課題を解決するためになされたもので、材料コスト及び製造コストの増大を防止しつつ、外形が小型化された樹脂封止型パワーモジュール及びそれを製造するための成形金型を提供することを目的とする。   The present invention has been made in order to solve the above-described problems. A resin-encapsulated power module having a reduced outer shape while preventing an increase in material cost and manufacturing cost, and molding for manufacturing the same. The purpose is to provide molds.

上記課題を解決するため、この発明に係る樹脂封止型パワーモジュールは、ベース板と
、前記ベース板に絶縁層を介して戴置された半導体素子と、前記半導体素子に電気的に接
続された端子と、上面と下面と互いに対向する２つの側面を有し前記ベース板を前記下面に露出するように収容し前記端子を前記上面に露出するように収容する樹脂筐体とを備える樹脂封止型パワーモジュールであって、前記樹脂筐体には前記側面のそれぞれから相互に対向して突出した複数の突起が設けられ、前記突起の下面は前記樹脂筐体の下面と同一平面にあり、平面視において前記樹脂筐体を１８０°回転した時に互いに一致しないように配置されていることを特徴とする。
In order to solve the above problems, a resin-encapsulated power module according to the present invention includes a base plate, a semiconductor element placed on the base plate via an insulating layer, and electrically connected to the semiconductor element. Resin-sealing comprising: a terminal; and a resin casing having two side surfaces opposed to each other on the upper surface and the lower surface and accommodating the base plate so as to be exposed on the lower surface and accommodating the terminal so as to be exposed on the upper surface a mold power module, wherein the resin housing a plurality of projections projecting opposite each other are provided from each of the side surfaces, the lower surface of the projection Ri underside flush with the near of the resin housing, The resin casings are arranged so as not to coincide with each other when the resin casings are rotated 180 ° in plan view .

また、上記課題を解決するため、この発明に係る成形金型は、上金型と下金型とから構
成され、前記上金型と前記下金型とで画定されるキャビティを有し、前記下金型には前記
キャビティと外部とを繋ぐエアベントが設けられ、前記下金型の内壁は底面と互いに対向
する２つの内側面を有し、前記下金型は前記内側面のそれぞれにおいて相互に対向して掘
り込まれた複数の凹部が設けられ、前記凹部の底面は前記下金型の底面と同一平面にあり、平面視において前記樹脂筐体を１８０°回転した時に互いに一致しないように配置されていることを特徴とする。
In order to solve the above problems, a molding die according to the present invention includes an upper die and a lower die, and has a cavity defined by the upper die and the lower die, The lower mold is provided with an air vent that connects the cavity and the outside, and the inner wall of the lower mold has two inner surfaces facing each other on the bottom surface, and the lower mold is mutually connected on each of the inner surfaces. a plurality of recesses dug oppositely are provided, the bottom surface of the recess Ri flush near a bottom surface of the lower mold, so as not to coincide with each other when rotated 180 ° the resin housing in a plan view It is arranged .

上記のような構成としたため、本発明に係る樹脂封止型パワーモジュール及びそれを製造するための成形金型によれば、材料コスト及び製造コストの増大を防止できると同時に、パワーモジュールの外形の小型化が可能となるという効果を奏する。   With the configuration as described above, the resin-encapsulated power module and the molding die for manufacturing the same according to the present invention can prevent an increase in material cost and manufacturing cost, and at the same time, the outer shape of the power module. There exists an effect that size reduction is attained.

本発明の実施の形態に係る樹脂封止型パワーモジュールを模式的に示す平面図、側面図及び正面図である。It is the top view, side view, and front view which show typically the resin-sealed type power module which concerns on embodiment of this invention. 本発明の実施の形態に係る半導体素子の製造方法を模式的に示す断面図である。It is sectional drawing which shows typically the manufacturing method of the semiconductor element which concerns on embodiment of this invention. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の一実施例を示す図である。It is a figure which shows one Example of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例１を示す図である。It is a figure which shows the modification 1 of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例２を示す図である。It is a figure which shows the modification 2 of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例３を示す図である。It is a figure which shows the modification 3 of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例４を示す図である。It is a figure which shows the modification 4 of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment. 本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例５を示す図である。It is a figure which shows the modification 5 of the shaping die for shape | molding the resin-sealed power module which concerns on this Embodiment.

＜実施の形態＞
図１は本発明の実施の形態に係る樹脂封止型パワーモジュールを模式的に示す平面図、側面図及び正面図であり、正面図については平面図のＡ−Ａ断面についての断面図を示している。以下図１に基づき本実施の形態に係る樹脂封止型パワーモジュールの構成について説明する。 <Embodiment>
FIG. 1 is a plan view, a side view, and a front view schematically showing a resin-encapsulated power module according to an embodiment of the present invention, and the front view shows a cross-sectional view taken along the line AA of the plan view. ing. The configuration of the resin-encapsulated power module according to the present embodiment will be described below with reference to FIG.

図１において、縦４０ｍｍ、横７０ｍｍ、厚さ２ｍｍの板状のベース板１の上には絶縁層２が接着されている。本実施の形態においては、ベース板１はその材料として熱伝導度の高い銅を用いているが、熱伝導度の高い他の材料、例えば銅合金、アルミニウム又はＡｌＳｉＣであっても良い。絶縁層２はその材料として電気的絶縁性を有するエポキシ樹脂を基材として熱伝導性を改善するためのフィラーを添加した絶縁シートを用いているが、電気的絶縁性を有する他の材料、例えば他の樹脂又はセラミックスであっても良い。   In FIG. 1, an insulating layer 2 is bonded onto a plate-like base plate 1 having a length of 40 mm, a width of 70 mm, and a thickness of 2 mm. In the present embodiment, the base plate 1 uses copper having a high thermal conductivity as its material, but may be another material having a high thermal conductivity, such as a copper alloy, aluminum, or AlSiC. The insulating layer 2 uses an insulating sheet to which a filler for improving thermal conductivity is added using an epoxy resin having an electrical insulating property as a base material, but other materials having an electrical insulating property, for example, Other resins or ceramics may be used.

絶縁層２の上には、絶縁層２の接着性を利用して、複数の回路パターン３が固着されている。複数の回路パターン３は、導電性が良好で厚さが０．５ｍｍの銅の板材を所定の形状に加工したものが用いられる。複数の回路パターン３の１つの上には半導体素子４が戴置されている。本実施の形態においては、半導体素子４はＩＧＢＴ４ａとダイオード４ｂであるが、他の半導体素子、例えばパワーＭＯＳＦＥＴやダイオード、サイリスタであっても良い。   A plurality of circuit patterns 3 are fixed on the insulating layer 2 using the adhesiveness of the insulating layer 2. The plurality of circuit patterns 3 are made by processing a copper plate having a good conductivity and a thickness of 0.5 mm into a predetermined shape. A semiconductor element 4 is placed on one of the plurality of circuit patterns 3. In the present embodiment, the semiconductor element 4 is the IGBT 4a and the diode 4b. However, other semiconductor elements such as a power MOSFET, a diode, and a thyristor may be used.

複数の回路パターン３のそれぞれの上には、外部回路との接続のための端子としての複数の筒状導通体５が、該回路パターン３と電気的に接続されるように、該回路パターン３に垂直に接合されている。複数の回路パターン３と半導体素子４との間は、金属細線６により電気的接続が施されている。   On each of the plurality of circuit patterns 3, the plurality of cylindrical conductors 5 as terminals for connection with an external circuit are electrically connected to the circuit pattern 3. It is joined vertically. The plurality of circuit patterns 3 and the semiconductor elements 4 are electrically connected by thin metal wires 6.

筒状導通体５は、その材料として導電性が良好な銅を用いているが、他の金属材料であっても良い。また、外部回路との接続に供するため、筒状導通体５はその上面に開口が設けられ、中空となっている。複数の筒状導通体５は、特許文献１に開示されているような樹脂製スリーブ７で相互に結合されている。   The cylindrical conductor 5 uses copper having good conductivity as its material, but may be other metal materials. Moreover, in order to use for connection with an external circuit, the cylindrical conductor 5 is provided with an opening on its upper surface and is hollow. The plurality of cylindrical conductors 5 are coupled to each other by a resin sleeve 7 as disclosed in Patent Document 1.

内部を保護するために、ベース板１、絶縁層２、回路パターン３、半導体素子４、筒状導通体５、金属細線６及び樹脂製スリーブ７を収容するように樹脂筐体８が設けられている。本実施の形態においては、樹脂筐体８はその材料として熱硬化性樹脂であるエポキシ樹脂を用いているが、例えばポリフェニレンサルファイド樹脂（ＰＰＳ樹脂）のような熱可塑性樹脂であっても良い。樹脂筐体８はその平面形状が四角形であり、互いに対向する上面と下面とを有し、互いに対向する２つの側面を二組有している。   In order to protect the inside, a resin casing 8 is provided so as to accommodate the base plate 1, the insulating layer 2, the circuit pattern 3, the semiconductor element 4, the cylindrical conductor 5, the fine metal wire 6 and the resin sleeve 7. Yes. In the present embodiment, the resin casing 8 uses an epoxy resin that is a thermosetting resin as a material thereof, but may be a thermoplastic resin such as a polyphenylene sulfide resin (PPS resin). The resin casing 8 has a quadrangular planar shape, has an upper surface and a lower surface facing each other, and has two sets of two side surfaces facing each other.

外部への熱放散のためにベース板１の下面は樹脂筐体８の下面に露出している。また、外部回路との接続に供するため、筒状導通体５の開口は樹脂筐体８の上面に露出している。樹脂筐体８の互いに対向する２つの側面には、それぞれの側面から相互に対向して突出した一対の突起８ａが複数個設けられている。突起８ａは樹脂筐体８の一部として設けられており、材質は樹脂筐体８と同じであり、突起８ａの下面は樹脂筐体８の下面と同一平面にある。   The lower surface of the base plate 1 is exposed on the lower surface of the resin casing 8 for heat dissipation to the outside. Further, the opening of the cylindrical conductor 5 is exposed on the upper surface of the resin casing 8 in order to provide connection with an external circuit. A plurality of a pair of protrusions 8a are provided on two opposite side surfaces of the resin casing 8 so as to protrude from each side surface. The protrusion 8 a is provided as a part of the resin casing 8, and the material thereof is the same as that of the resin casing 8, and the lower surface of the protrusion 8 a is flush with the lower surface of the resin casing 8.

図２は本発明の実施の形態に係る樹脂封止型パワーモジュールの製造方法を示す模式図である。図２は図１の側面図方向から見た断面で描かれている。以下図２に基づき本実施の形態に係る樹脂封止型パワーモジュールの製造方法について説明する。   FIG. 2 is a schematic diagram showing a method for manufacturing a resin-encapsulated power module according to an embodiment of the present invention. FIG. 2 is drawn in a cross section viewed from the side view direction of FIG. Hereinafter, a method for manufacturing the resin-encapsulated power module according to the present embodiment will be described with reference to FIG.

まず、図２（ａ）を参照して、ベース板１と、ベース板１上に絶縁層２を介して接着された回路パターン３と、回路パターン３上に電気的に接続された半導体素子４（図示省略）と、同じく回路パターン３上に電気的に接続され樹脂製スリーブ７で相互に結合されている筒状導通体５と、回路パターン３と半導体素子４との間を電気的に接続する金属細線６（図示省略）とが実装された被封止物９を用意する。   First, referring to FIG. 2A, a base plate 1, a circuit pattern 3 bonded on the base plate 1 via an insulating layer 2, and a semiconductor element 4 electrically connected on the circuit pattern 3. (Not shown), and electrically connected between the circuit pattern 3 and the semiconductor element 4 and the cylindrical conductor 5 electrically connected on the circuit pattern 3 and connected to each other by the resin sleeve 7 An object to be sealed 9 on which a thin metal wire 6 (not shown) to be mounted is mounted is prepared.

次に、図２（ｂ）を参照して、トランスファーモールド成形するため、用意された被封止物９を搬送治具１０で成形金型１１の下金型１１ａのキャビティ内に搬送する。搬送治具１０は開閉可能な２つのアームを有しており、アームの先端には鉤爪が形成されている。搬送治具１０はアームを閉じて用意された被封止物９のベース板１の下面をその鉤爪でつかみ、被封止物９を下金型１１ａのキャビティ内に搬送し、そこでアームを開いて被封止物９をキャビティ内に落とし込む。   Next, referring to FIG. 2B, the prepared object 9 is transported into the cavity of the lower mold 11 a of the molding die 11 by the transport jig 10 for transfer molding. The conveyance jig 10 has two arms that can be opened and closed, and a claw is formed at the tip of the arm. The conveying jig 10 closes the arm and grasps the lower surface of the base plate 1 of the object 9 to be prepared with its claws, and conveys the object 9 into the cavity of the lower mold 11a, where the arm is opened. Then, the object to be sealed 9 is dropped into the cavity.

次に、図２（ｃ）を参照して、成形金型１１の下金型１１ａに成形金型１１の上金型１１ｂを合わせて型締めを行い、キャビティ内にモールド樹脂を加圧充填しモールド樹脂の加熱硬化を行う。モールド樹脂が硬化すると、成形金型１１を外し、必要なら後硬化処理を施す。以上により、本実施の形態に係る樹脂封止型パワーモジュールが形成される。   Next, referring to FIG. 2 (c), the upper mold 11b of the molding die 11 is aligned with the lower mold 11a of the molding mold 11, and the mold is clamped, and the mold resin is pressurized and filled in the cavity. The mold resin is cured by heating. When the mold resin is cured, the molding die 11 is removed, and if necessary, post-curing treatment is performed. Thus, the resin-encapsulated power module according to the present embodiment is formed.

ここで、上述した製造工程で使用した成形金型について説明する。図３は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の一実施例を示す平面図とそのＢ−Ｂ断面図である。   Here, the molding die used in the manufacturing process described above will be described. FIG. 3 is a plan view showing an example of a molding die for molding the resin-encapsulated power module according to the present embodiment and a cross-sectional view taken along the line BB.

成形金型１１は下金型１１ａと上金型１１ｂとで構成されている。下金型１１ａの内壁は底面と互いに対向する２つの内側面を二組有しており、上金型１１ｂの内壁は頂面と互いに対向する２つの内側面を二組有しており、下金型１１ａの内壁と上金型１１ｂの内壁とでキャビティを画定している。下金型１１ａは、さらにキャビティと外部とを繋ぐエアベント１１ｄを備えている。エアベント１１ｄはモールド樹脂を加圧充填する際にキャビティ内の空気を外部に逃がすための排気路であり、下金型１１ａの上金型１１ｂとの接合面に溝を形成する形で設けられている。   The molding die 11 is composed of a lower die 11a and an upper die 11b. The inner wall of the lower mold 11a has two sets of two inner surfaces facing each other with the bottom surface, and the inner wall of the upper mold 11b has two sets of two inner surfaces facing each other with the top surface. A cavity is defined by the inner wall of the mold 11a and the inner wall of the upper mold 11b. The lower mold 11a further includes an air vent 11d that connects the cavity and the outside. The air vent 11d is an exhaust path for releasing the air in the cavity to the outside when pressurizing and filling the mold resin. Yes.

下金型１１ａの内側面のそれぞれには、相互に対向して掘り込まれた一対の凹部１１ｃが二組設けられている。凹部１１ｃはその底面が下金型１１ａの底面と同一平面にあるように設けられている。凹部１１ｃの位置は、搬送治具１０により被封止物９を下金型１１ａのキャビティ内に搬送する際の、搬送治具１０のアームの位置に対応している。   Each of the inner surface of the lower mold 11a is provided with two pairs of a pair of recesses 11c dug in opposition to each other. The recess 11c is provided such that its bottom surface is flush with the bottom surface of the lower mold 11a. The position of the recess 11c corresponds to the position of the arm of the transfer jig 10 when the object 9 is transferred into the cavity of the lower mold 11a by the transfer jig 10.

このように、成形金型１１には一対の凹部１１ｃが二組設けられているので、上述した本実施の形態に係る樹脂封止型パワーモジュールの製造工程における被封止物９の搬送治具１０による下金型１１ａのキャビティ内への搬送の際において、アームを凹部１１ｃ内に収容でき、下金型１１ａのキャビティ内でアームを開くことが可能となり、被封止物９をキャビティ内に落とし込むことができる。したがって、成形金型のキャビティ内への被封止物の搬送を自動化でき、材料コスト及び製造コストの増大を防止できると同時に、パワーモジュールの外形の小型化が可能となる。   As described above, since the molding die 11 is provided with two pairs of the recesses 11c, the conveying jig for the object 9 to be sealed in the manufacturing process of the resin-sealed power module according to the present embodiment described above. When the lower mold 11a is transported into the cavity by 10 the arm can be accommodated in the recess 11c, and the arm can be opened in the cavity of the lower mold 11a, and the object 9 to be sealed is placed in the cavity. Can be dropped. Therefore, the conveyance of the object to be sealed into the cavity of the molding die can be automated, and the increase in material cost and manufacturing cost can be prevented, and at the same time, the outer shape of the power module can be reduced.

以上説明してきたように、本実施の形態に係る樹脂封止型パワーモジュール及びそれを製造するための成形金型によれば、材料コスト及び製造コストの増大を防止できると同時に、パワーモジュールの外形の小型化が可能となるという効果を奏する。   As described above, according to the resin-encapsulated power module and the molding die for manufacturing the same according to the present embodiment, an increase in material cost and manufacturing cost can be prevented, and at the same time, the outer shape of the power module. There is an effect that downsizing of the apparatus becomes possible.

このような樹脂封止型パワーモジュールは、接続工程の簡略化を目的として、しばしば特許文献２に記載されているような外部端子を備えたインサートケースが装着される。本実施の形態に係る樹脂封止型パワーモジュールのようにその平面形状が回転対称である四角形である場合、インサートケースが正規の接続形態ではなく、１８０°回転した形態で装着される虞がある。このように装着された場合は、インサートケースの外部端子はパワーモジュールの筒状導通体５に適切に接続されなくなる。   Such a resin-encapsulated power module is often equipped with an insert case having external terminals as described in Patent Document 2 for the purpose of simplifying the connection process. When the planar shape of the resin-encapsulated power module according to the present embodiment is a quadrangle that is rotationally symmetric, the insert case may be mounted in a 180 ° rotated form instead of a regular connection form. . When mounted in this manner, the external terminal of the insert case is not properly connected to the cylindrical conductor 5 of the power module.

このような誤装着を防止するために、樹脂筐体８の側面から相互に対向して突出した一対の突起８ａを、平面視において樹脂筐体８を１８０°回転した時に互いに一致しないように配置することが望ましい。インサートケースが１８０°回転した形態で装着された場合には、インサートケースに突起８ａに対応するように形成された凹部が突起８ａと篏合せず誤装着を防止できるからである。本実施の形態に係る樹脂封止型パワーモジュールの場合では、相互に対向して突出した一対の突起８ａの一方の中心線を他方の中心線に対して僅かにずらして配置している。また、搬送治具１０が安定して被封止物９をつかめるよう、一対の突起８ａの一方の突起８ａの中心線が他方の突起８ａと重なるように一対の突起８ａを配置している   In order to prevent such erroneous mounting, the pair of protrusions 8a projecting from the side surfaces of the resin casing 8 so as to face each other are arranged so as not to coincide with each other when the resin casing 8 is rotated 180 ° in plan view. It is desirable to do. This is because when the insert case is mounted in a form rotated by 180 °, the recess formed in the insert case so as to correspond to the protrusion 8a does not mate with the protrusion 8a, thereby preventing erroneous mounting. In the case of the resin-encapsulated power module according to the present embodiment, one center line of the pair of protrusions 8a protruding so as to face each other is arranged slightly shifted from the other center line. In addition, the pair of protrusions 8a is arranged so that the center line of one protrusion 8a of the pair of protrusions 8a overlaps the other protrusion 8a so that the conveying jig 10 can stably hold the object 9 to be sealed.

図４は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例１を示す平面図とそのＣ−Ｃ断面図である。エアベント１１ｄが樹脂溜り１１ｅを有している点を除き図３と同様であるため、説明を省略する。   FIG. 4 is a plan view showing a modification 1 of the molding die for molding the resin-encapsulated power module according to the present embodiment, and a cross-sectional view taken along the line C-C. Except for the point that the air vent 11d has the resin reservoir 11e, it is the same as FIG.

リードフレームを金属製電極端子として用いる場合、リードフレームによりエアベントにおけるモールド樹脂のバリの拡がりが防止できたが、本実施の形態に係る樹脂封止型パワーモジュールのような金属製電極端子がパッケージ上面方向に露出しているパワーモジュールの場合は、リードフレームによるエアベントにおけるモールド樹脂のバリの拡がり防止は期待できない。したがって、本変形例のようにエアベント１１ｄに樹脂溜り１１ｅを設けることにより、エアベント１１ｄにおけるモールド樹脂のバリの拡がりが防止できる。   When the lead frame is used as a metal electrode terminal, the lead frame can prevent the mold resin burr from spreading in the air vent. In the case of the power module exposed in the direction, it is not expected to prevent the mold resin burr from spreading in the air vent by the lead frame. Therefore, by providing the resin reservoir 11e in the air vent 11d as in this modification, it is possible to prevent the mold resin burrs from spreading in the air vent 11d.

図５は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例２を示す平面図とそのＤ−Ｄ断面図である。樹脂溜り１１ｅにエジェクターピン１１ｆが設けられている点を除き図４と同様であるため、説明を省略する。   FIG. 5 is a plan view showing a second modification of the molding die for molding the resin-encapsulated power module according to the present embodiment, and a DD cross-sectional view thereof. Since it is the same as that of FIG. 4 except that the resin pin 11e is provided with an ejector pin 11f, a description thereof will be omitted.

図４の変形例１においては樹脂溜り１１ｅを設けることによりモールド樹脂のバリの拡がりが防止できたが、その代わり樹脂溜り１１ｅにおいて硬化した樹脂がバリとなり、その排出が困難となったが、樹脂溜り１１ｅにエジェクターピン１１ｆを設け、エジェクターピン１１ｆを上下動させることにより、成形金型１１の清掃を自動的に効率よく行うことが可能となり、製造コストの増大の防止に寄与する。   In the first modification shown in FIG. 4, the spread of the burr of the mold resin can be prevented by providing the resin reservoir 11e, but instead, the resin cured in the resin reservoir 11e becomes a burr and its discharge becomes difficult. By providing the ejector pin 11f in the reservoir 11e and moving the ejector pin 11f up and down, the molding die 11 can be automatically and efficiently cleaned, which contributes to an increase in manufacturing cost.

図６は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例３を示す平面図とそのＥ−Ｅ断面図である。エアベント１１ｄが下金型１１ａのキャビティ側から外部に向かってその方向に垂直な断面積が小さくなっていく形状である点を除き図３と同様であるため、説明を省略する。   FIG. 6 is a plan view showing a modified example 3 of the molding die for molding the resin-encapsulated power module according to the present embodiment, and its EE cross-sectional view. Since the air vent 11d is the same as FIG. 3 except that it has a shape in which the cross-sectional area perpendicular to the direction decreases from the cavity side of the lower mold 11a toward the outside, the description thereof is omitted.

エアベント１１ｄを上述したような形状としたため、エアベント１１ｄに形成された樹脂バリと成形物との繋がりが強固となり、エアベント１１ｄに形成された樹脂バリが成形物の取り出しと共に成形金型１１から取り出されるため、成形金型１１の清掃を自動的に効率よく行うことが可能となり、製造コストの増大の防止に寄与する。成形物に繋がった上記樹脂バリは、他の樹脂バリと共に後に実施されるバリ取り工程で除去される。   Since the air vent 11d has the shape as described above, the connection between the resin burr formed on the air vent 11d and the molded product becomes strong, and the resin burr formed on the air vent 11d is removed from the molding die 11 together with the removal of the molded product. Therefore, the molding die 11 can be automatically and efficiently cleaned, which contributes to prevention of an increase in manufacturing cost. The resin burrs connected to the molded product are removed together with other resin burrs in a deburring process performed later.

図７は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例４を示す平面図とそのＦ−Ｆ断面図である。上金型１１ｂが下金型１１ａの凹部１１ｃに対応する領域に延在する凸部１１ｇを有している点を除き図３と同様であるため、説明を省略する。   FIG. 7 is a plan view showing a modified example 4 of the molding die for molding the resin-encapsulated power module according to the present embodiment and a sectional view taken along line FF. Since the upper mold 11b is the same as FIG. 3 except that it has a convex part 11g extending in a region corresponding to the concave part 11c of the lower mold 11a, the description is omitted.

上金型１１ｂが上述したような凸部１１ｇを有することにより、成形金型１１の型締め時に凸部１１ｇが下金型１１ａの凹部１１ｃに入り込むこととなり、凹部１１ｃにおけるモールド樹脂の充填が抑制され、材料コストの増大の防止に寄与する。   Since the upper mold 11b has the convex portion 11g as described above, the convex portion 11g enters the concave portion 11c of the lower mold 11a when the molding die 11 is clamped, and the filling of the mold resin in the concave portion 11c is suppressed. And contributes to prevention of an increase in material cost.

図８は本実施の形態に係る樹脂封止型パワーモジュールを成形するための成形金型の変形例５を示す平面図とそのＧ−Ｇ断面図である。凹部１１ｃが下金型１１ａの内側面から底面にかけて延在する延在部１１ｈを有する点を除き図３と同様であるため、説明を省略する。延在部１１ｈは凹部１１ｃから連続して下金型１１ａの底面まで掘り込まれて形成されている部分である。   FIG. 8 is a plan view showing a modified example 5 of the molding die for molding the resin-sealed power module according to the present embodiment and a GG sectional view thereof. Since the recessed portion 11c is the same as FIG. 3 except that it has an extending portion 11h extending from the inner surface to the bottom surface of the lower mold 11a, the description thereof is omitted. The extending part 11h is a part formed by being continuously dug up to the bottom surface of the lower mold 11a from the concave part 11c.

このように、成形金型１１には凹部１１ｃから連続して下金型１１ａの底面まで掘り込まれて形成された延在部１１ｈを備えているので、上述した本実施の形態に係る樹脂封止型パワーモジュールの製造工程における被封止物９の搬送治具１０による下金型１１ａのキャビティ内への搬送の際において、アームの先端の鉤爪を延在部１１ｈ内に収容できるため、被封止物９をキャビティ内に鉤爪の高さ分だけ落下させることを回避でき、被封止物９に与える機械的衝撃を緩和でき、パワーモジュールの信頼性の向上に寄与する。   Thus, since the molding die 11 is provided with the extending portion 11h formed continuously from the recess 11c to the bottom surface of the lower die 11a, the resin sealing according to the above-described embodiment is provided. Since the claw at the tip of the arm can be accommodated in the extending part 11h when the object 9 is conveyed into the cavity of the lower mold 11a by the conveying jig 10 in the manufacturing process of the stationary mold power module, It is possible to avoid dropping the sealed object 9 into the cavity by the height of the claw, and to reduce the mechanical impact applied to the sealed object 9, thereby contributing to the improvement of the reliability of the power module.

なお、以上の実施の形態の説明においては、半導体素子がＩＧＢＴおよびダイオードである場合を示したが、本発明に係る樹脂封止型パワーモジュールの半導体素子はこれに限定されるものではない。例えば、半導体素子はパワーＭＯＳＦＥＴやダイオード、サイリスタなどでもよい。   In the above description of the embodiment, the semiconductor element is an IGBT and a diode. However, the semiconductor element of the resin-encapsulated power module according to the present invention is not limited to this. For example, the semiconductor element may be a power MOSFET, a diode, a thyristor, or the like.

この発明に係る半導体装置は、交流から直流への変換、直流から交流への変換、あるいは周波数変換等の電力変換を行う機器に適用することにより、その機器の電力変換効率の向上に寄与することができる。   The semiconductor device according to the present invention contributes to the improvement of power conversion efficiency of a device by applying it to a device that performs power conversion such as AC to DC conversion, DC to AC conversion, or frequency conversion. Can do.

１ ベース板
２ 絶縁層
３ 回路パターン
４ 半導体素子
４ａ ＩＧＢＴ
４ｂ ダイオード
５ 筒状導通体
６ 金属細線
７ 樹脂製スリーブ
８ 樹脂筐体
８ａ 突起
９ 被封止物
１０ 搬送治具
１１ 成形金型
１１ａ 下金型
１１ｂ 上金型
１１ｃ 凹部
１１ｄ エアベント
１１ｅ 樹脂溜り
１１ｆ エジェクターピン
１１ｇ 凸部
１１ｈ 延在部 DESCRIPTION OF SYMBOLS 1 Base board 2 Insulating layer 3 Circuit pattern 4 Semiconductor element 4a IGBT
4b Diode 5 Cylindrical conductor 6 Metal thin wire 7 Resin sleeve 8 Resin housing 8a Projection 9 Sealed object 10 Transfer jig 11 Mold 11a Lower mold 11b Upper mold 11c Recess 11d Air vent 11e Resin pool 11f Ejector Pin 11g Convex part 11h Extension part

Claims (6)

ベース板と、前記ベース板に絶縁層を介して戴置された半導体素子と、前記半導体素子に電気的に接続された端子と、上面と下面と互いに対向する２つの側面を有し前記ベース板を前記下面に露出するように収容し前記端子を前記上面に露出するように収容する樹脂筐体と、を備える樹脂封止型パワーモジュールであって、
前記樹脂筐体には前記側面のそれぞれから相互に対向して突出した複数の突起が設けられ、前記突起の下面は前記樹脂筐体の下面と同一平面にあり、平面視において前記樹脂筐体を１８０°回転した時に互いに一致しないように配置されていることを特徴とする樹脂封止型パワーモジュール。 The base plate having a base plate, a semiconductor element placed on the base plate via an insulating layer, a terminal electrically connected to the semiconductor element, and two side surfaces opposed to each other on an upper surface and a lower surface A resin-encapsulated power module comprising: a resin housing that is exposed so as to be exposed on the lower surface, and a terminal that accommodates the terminal so as to be exposed on the upper surface,
Wherein the plastic housing a plurality of projections projecting opposite each other are provided from each of the side surfaces, the lower surface of the projection Ri underside flush with the near of the resin casing, the resin housing in a plan view The resin-encapsulated power module is arranged so as not to coincide with each other when rotated 180 degrees . 上金型と下金型とから構成され、前記上金型の内壁と前記下金型の内壁とで画定されるキ
ャビティを有し、前記下金型には前記キャビティと外部とを繋ぐエアベントが設けられ、
前記下金型の内壁は底面と互いに対向する２つの内側面を有し、前記下金型は前記内側面
のそれぞれにおいて相互に対向して掘り込まれた複数の凹部が設けられ、前記凹部の底面
は前記下金型の底面と同一平面にあり、平面視において前記樹脂筐体を１８０°回転した時に互いに一致しないように配置されていることを特徴とする成形金型。 The upper mold is composed of an upper mold and a lower mold, and has a cavity defined by an inner wall of the upper mold and an inner wall of the lower mold, and the lower mold has an air vent that connects the cavity and the outside. Provided,
The inner wall of the lower mold has two inner side surfaces opposed to each other on the bottom surface, and the lower mold is provided with a plurality of recesses that are dug in opposition to each other on each of the inner side surfaces. bottom Ri flush near a bottom surface of the lower die, molding die, characterized in that it is arranged so as not to coincide with each other when rotated 180 ° the resin housing in a plan view. 前記エアベントは樹脂溜りを有していることを特徴とする請求項２記載の成形金型。 The molding die according to claim 2, wherein the air vent has a resin reservoir. 前記樹脂溜りにはエジェクターピンが設けられていることを特徴とする請求項３記載の成
形金型。 The molding die according to claim 3, wherein an ejector pin is provided in the resin reservoir. 前記エアベントは前記キャビティ側から外部に向かってその方向に垂直な断面積が小さく
なっていく形状であることを特徴とする請求項２記載の成形金型。 The molding die according to claim 2, wherein the air vent has a shape in which a cross-sectional area perpendicular to the direction decreases from the cavity side toward the outside. 前記上金型は前記下金型の前記凹部に対応する領域に延在する凸部を有していることを特
徴とする請求項２記載の成形金型。 3. The molding die according to claim 2, wherein the upper die has a convex portion extending in a region corresponding to the concave portion of the lower die.
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JPH1126488A (en) * 1997-07-04 1999-01-29 Nec Corp Metal mold for semiconductor resin sealing
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