WO1994025984A1 - Ic package and method of its manufacture - Google Patents
Ic package and method of its manufacture Download PDFInfo
- Publication number
- WO1994025984A1 WO1994025984A1 PCT/JP1994/000692 JP9400692W WO9425984A1 WO 1994025984 A1 WO1994025984 A1 WO 1994025984A1 JP 9400692 W JP9400692 W JP 9400692W WO 9425984 A1 WO9425984 A1 WO 9425984A1
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- hole
- substrate
- package
- paste
- bump
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/4007—Surface contacts, e.g. bumps
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/12—Mountings, e.g. non-detachable insulating substrates
- H01L23/13—Mountings, e.g. non-detachable insulating substrates characterised by the shape
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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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- H01—ELECTRIC ELEMENTS
- 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
- H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
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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
- H01L23/49827—Via connections through the substrates, e.g. pins going through the substrate, coaxial cables
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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
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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
- H01L2224/481—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
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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
- H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
- H01L2224/491—Disposition
- H01L2224/49105—Connecting at different heights
- H01L2224/49109—Connecting at different heights outside the semiconductor or solid-state body
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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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
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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
- H01L24/42—Wire connectors; Manufacturing methods related thereto
- H01L24/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L24/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
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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
- H01L2924/14—Integrated circuits
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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
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
- H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA
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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
- H01L2924/151—Die mounting substrate
- H01L2924/153—Connection portion
- H01L2924/1532—Connection portion the connection portion being formed on the die mounting surface of the substrate
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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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0364—Conductor shape
- H05K2201/0367—Metallic bump or raised conductor not used as solder bump
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/09372—Pads and lands
- H05K2201/09481—Via in pad; Pad over filled via
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/0959—Plated through-holes or plated blind vias filled with insulating material
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
- H05K2201/09909—Special local insulating pattern, e.g. as dam around component
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/0094—Filling or covering plated through-holes or blind plated vias, e.g. for masking or for mechanical reinforcement
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/341—Surface mounted components
- H05K3/3431—Leadless components
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/36—Assembling printed circuits with other printed circuits
- H05K3/368—Assembling printed circuits with other printed circuits parallel to each other
Definitions
- the present invention relates to an IC package, an IC package, and a method for manufacturing the same, and more particularly, to an IC package in which hemispherical bumps are provided on a substrate as connection terminals, and a method for manufacturing the same.
- TAB is advantageous in terms of manufacturing cost because it can be inner-bonded by batch bonding, but since it can be connected only on the outer periphery â , the wiring pattern of the connection part must be finely formed. I have to. It also emphasizes the need for special equipment during bonding.
- connection terminal of the QFP since the installation position of the connection terminal of the QFP is limited only to the periphery of the package, the only way to increase the number of pins is to increase the package external dimensions or narrow the pin pitch. There is a problem that conversion is restricted.
- the BGA uses solder balls as connection terminals, and covers the entire board surface.
- the number of pins can be increased appropriately because the body can be used as an installation space for the connection terminals.However, there is a risk that the solder balls may be broken and short-circuited during mounting, and the solder balls may be short-circuited during soldering. There was a problem that the solder balls had to be attached after IC bonding and resin sealing because of the possibility of chipping.
- the IC package of the present application is formed by forming bumps on a substrate, similar to a BGA package.However, the method of forming bumps on a substrate is not only the method of attaching the solder balls described above, but also the method of forming a plated package. There is also a method of attaching a plastic ball. However, conventional packages with balls formed separately are attached with insufficient ball joint strength and handling very small parts, which makes handling difficult. There was a problem.
- the heat dissipation of the IC package is a problem.
- a method of improving the heat dissipation of the IC package there is a method of attaching a heat dissipating fin and a method of providing a thermal via.
- the method of attaching the heat dissipating fin has the advantage that the heat dissipating effect can be obtained relatively easily, and the combined use with the air blower can achieve a higher heat dissipating effect.
- the heat dissipating fin needs to have an appropriate size, which hinders miniaturization and thinning of the IC package.
- the Ic package according to the present invention is a product in which hemispherical bumps are formed on the substrate surface to enable surface mounting, and the bumps are formed integrally with the substrate.
- the method for manufacturing an Ic package according to the present invention is characterized in that it is formed so as to project hemispherically from the substrate surface. It is characterized in that hemispherical bumps are formed by filling. Note that the paste used may be conductive or may be electrically insulating.
- the term âthrough holesâ is used to mean electrical conductivity
- a certain amount of paste is extruded from one end of the hole or through hole, and the paste is formed into a hemispherical shape by the action of its own weight and surface tension.
- the viscosity and viscosity of the paste used are important factors. For example, if the stickiness is too high, the paste protrudes sharply from the through hole, and if the stickiness is too low, the paste flows aside and the rising shape is not formed.
- the bumps formed in this way must be uniform in size and height. This is because if the height of the pump is not uniform, it will not be possible to make reliable connections during mounting.
- the other end of the through hole on which the bump is formed as described above is connected to the wiring pattern formed on the board surface, and the hemispherical bump and the wiring pattern are electrically connected to each other at the through hole, enabling surface mounting. become.
- a method of providing a hole for forming a through-hole in a substrate, applying a through-hole, and then filling the paste and a method of forming a hole for forming a through-hole in the substrate.
- a paste is formed as it is without performing through-hole plating.
- the through hole is not to be applied, the hole for forming the through hole Adhesion between the inner surface of the hole and the paste becomes a problem, while the through-hole plating has the advantage that the adhesion between the inner surface of the hole and the plating layer is improved, and the sealing performance of the package is improved. There is. In addition, when the through hole is provided, there is an advantage that the electric conduction in the through hole portion is improved.
- an electrically insulating paste can be used instead of the conductive paste because the conductive layer is electrically connected to the inner layer of the through hole.
- the paste constitutes a core portion that retains the shape of a hemispherical bump.
- a conductor plating layer such as a copper plating layer is preferably formed on the surface of the hemispherical portion of the bump. This conductor-plated layer has the effect of reinforcing the bump, enabling soldering during mounting, improving the sealing of through holes, and preventing the IC package from absorbing moisture.
- the conductor plating layer can be formed by electrolytic plating or electroless plating.
- electrolytic plating it is necessary to electrically connect to the bumps. Therefore, it is necessary to select electrolytic plating or electroless plating in consideration of the manufacturing process for forming a wiring pattern and the like.
- Electroless plating can also be used as a base plating that provides electrical continuity for electrolytic plating.
- paste for forming a hemispherical bump used in the present invention in addition to the above-mentioned conductive or electrically insulating paste, a material having solderability can also be used.
- Paste with solderability In the case of using a solder bump, there is an advantage that mounting can be performed by soldering without providing the above-mentioned conductor mounting layer on the surface of the hemispherical bump.
- thermal vias are formed in the substrate to improve the thermal conductivity of the package. You can do that too.
- the conventional solder body formed separately is used.
- the bumps can be formed integrally with the substrate, and if the bumps are missing from the substrate, the bumps can be prevented. Therefore, it is not necessary to take a manufacturing process of bonding the solder balls after performing the IC bonding or resin sealing as in the related art, and it is possible to provide the IC package as a completed product. This makes it easy to manufacture a semiconductor device.
- connection terminals are formed as hemispherical bumps, it is possible to effectively prevent the occurrence of an electric short circuit at the time of mounting.
- the bump is formed by a core in which the paste is solidified in a hemispherical shape, the bump has shape retention, and can prevent the bump from being crushed during mounting.
- the substrate material of the Ic package according to the present invention a material having electrical insulating properties can be widely applied.
- heat-resistant glass epoxy modified from glass epoxy, BT resin, polyimide, or a mixture of these with epoxy resin is preferred. It is also possible to use a ceramic substrate instead of a plastic substrate.
- the substrate constituting the Ic package according to the present invention is not limited to a single layer. Alternatively, a multilayer substrate having a plurality of wiring pattern layers can be used. Also, the present invention can be applied to a multi-chip type board on which a plurality of IC chips are mounted. In addition, the present invention can be applied to a substrate equipped with a heat spreader or a substrate used in combination with a tape carrier.
- FIG. 1 is a sectional view showing a state in which holes for forming through holes are formed in a substrate in an embodiment of a method of manufacturing an IC package.
- FIG. 2 is a cross-sectional view showing a state where a through-hole is applied.
- FIG. 3 is a sectional view showing a state where a land is formed on a substrate.
- FIG. 4 is a cross-sectional view showing a state where the conductive paste is filled in the through holes.
- FIG. 5 is a cross-sectional view showing a state where electrolytic plating has been applied to the bump and the plating layer.
- FIG. 6 is a cross-sectional view showing a state in which a wiring pattern has been formed and protection has been applied. .
- FIG. 7 is a side sectional view of the IC package.
- FIG. 8 is a bottom view of the IC package.
- FIG. 9 is a cross-sectional view showing a state in which the IC chip is mounted on the IC package.
- FIG. 10 is a sectional view showing another example of forming a hemispherical bump.
- FIG. 11 is a cross-sectional view of a second embodiment of a method for manufacturing an IC package in which through-hole plating has been performed.
- FIG. 12 is a sectional view showing a state where a wiring pattern and a land are formed by double-sided etching.
- FIG. 13 is a sectional view showing a state where bumps are formed.
- Fig. 14 shows the electroless copper plating applied to the bump surface and the plating layer. It is sectional drawing of a state.
- FIG. 15 is a sectional view showing a state where a land is formed in the fourth embodiment of the method of manufacturing an IC package.
- FIG. 16 is a sectional view showing a state where bumps are formed.
- FIG. 17 is a sectional view showing a state where a copper plating layer is provided.
- FIG. 18 is a sectional view showing a state where a wiring pattern is formed.
- FIG. 19 shows the IC obtained by the sixth embodiment of the method of manufacturing an IC package.
- FIG. 20 is a cross-sectional view of the IC package obtained in the seventh embodiment of the method of manufacturing an IC package.
- FIG. 21 is an explanatory view showing a state in which an IC package is mounted on a motherboard.
- FIG. 22 is an explanatory view showing a state of connection between a hemispherical bump and a wiring pattern.
- FIG. 23 is an explanatory view showing a state of connection between a hemispherical bump and a wiring pattern.
- FIG. 2 is an explanatory view showing a state of connection in a state where the hemispherical bump and the wiring pattern are misaligned.
- FIG. 25 is an explanatory diagram showing a state of connection in a state where the flat bump and the wiring pattern are misaligned.
- FIG. 1 to 6 show a first embodiment of a method of manufacturing an IC package according to the present invention.
- This embodiment is an example of forming a hemispherical bump using a conductive paste.
- the conductive paste for example, CLX-204 (manufactured by Tamura Seisakusho) and MDP-800, 900 (manufactured by Mitsui Toatsu Chemicals) can be used.
- Fig. 1 shows a state in which a hole 14 for forming a through hole is formed by first making a hole in a substrate 10 on which copper foil 12 is adhered and formed on both sides.
- the holes 14 are formed in a predetermined number in accordance with the planar arrangement of the bumps provided on the substrate 10. In the figure, only one hole 14 is shown for explanation.
- plating layer 16 is formed on the inner wall surface of hole 14 to form through holes 15 and plating layer 16 is formed on the surface of copper foil 12 (Fig. 2). ).
- the plating layer 16 is for electrically connecting a wiring pattern formed on the upper surface of the substrate 10 to a pump formed on the lower surface of the substrate 10.
- Single-hole plating is performed by applying electroless copper after electroless copper is applied.
- Land 18 has a circular planar shape, and is slightly larger in diameter than the diameter of the bump to be formed (FIG. 3).
- FIG. 4 shows a state in which the conductive paste 20 is filled in the through hole 15.
- the conductive paste 20 extruded from the lower end of the through hole 15 projects hemispherically below the land 18 by the action of its own weight and surface tension.
- the conductive base 20 is solidified by heating to form a hemispherical portion 20 a on the lower surface of the substrate 10.
- the conductive paste 20 on the through hole 15 is ground and flattened.
- electrolytic copper plating is applied to the conductive paste 2
- a copper plating layer 22 is provided on the outer surface of the hemispherical portion 20a of 0, the exposed surface of the conductive paste 20 on the upper surface of the substrate 10, and the surface of the plating layer 16 (FIG. 5).
- a single-sided etching is performed on the conductor layer provided on the upper surface of the substrate 10 to form a wiring pattern 24.
- a wiring pattern 24 is formed on the upper surface of the substrate 10, and the wiring pattern 24 and the bumps on the lower surface of the substrate 10 are electrically connected.
- Fig. 6 shows a state in which nickel plating, gold plating and other protective plating 26 are provided on the surfaces of the bumps and wiring patterns 24 after the above process.
- the IC package is subjected to external processing to make it a product.
- the IC package of the present embodiment is different from a conventional product in which a bump is formed by using solder balls or the like, and the through hole 15 is formed by filling the conductive paste 20 into the through hole 15 so that the substrate 10 and the hemisphere are formed.
- the feature is that the shaped bump is formed on the body.
- the copper-plated layer 22 is provided on the outer surface of the hemispherical portion 20a of the conductive paste 20.
- the copper-plated layer 22 functions to reinforce the hemispherical bump and has a function at the time of mounting. It has the effect of improving the sealing performance of the IC package by sealing the through hole 15 to obtain solderability.
- the land 18 is formed to have a larger diameter than the hemispherical portion 20a, so that the copper plating layer 22 has a step shape at the base position of the bump.
- Such a stepped shape is more effective for reinforcing a hemispherical bump.
- FIG. 10 shows an example in which the diameter of the bump and the diameter of the land 18 are the same size so that no step is formed at the base of the bump.
- electrolytic copper plating was performed to provide a copper plating layer 22.
- other conductor plating such as nickel plating, silver plating, and gold plating can be used.
- the same or different plating layers can be formed in a plurality of layers.
- a conductive paste is used as the paste filled in the through-holes 15, but a paste having conductivity and a property of easily protruding electroless copper may be used.
- the same manufacturing method as in the above embodiment is used.
- the electroless copper plating is first performed by using the property of a base that is easy to protrude the electroless copper.
- the copper plating layer is thickened by electrolytic copper plating.
- electrolytic copper plating when it is difficult to form a copper plating layer even on a conductive paste, it is more reliable to deposit the copper plating layer by depositing electroless copper. It has the advantage that it can be formed.
- the electroless plating is not limited to the copper plating, but may be nickel plating, silver plating, or other electroless plating, and these bumps may be formed by electroless plating. What is necessary is just to select the material which is easy to be able to break out a coating film.
- FIG. 7 is a side sectional view of an IC package in which hemispherical bumps 30 are formed on a substrate 10, and FIG. 8 is a bottom view.
- the example shown is a cavity-down type product, in which a mounting hole 32 for mounting an IC chip is formed in the center of the lower surface of the substrate 10, and a hemispherical bump 30 is formed around the mounting hole 32. are doing.
- FIG. 9 shows a semiconductor device in which an IC chip 34 is mounted on an IC package in which hemispherical bumps 30 are formed.
- a substrate 10 is constituted by a multilayer substrate having a plurality of inner layer wiring patterns 35 â Surface mount type IC package formed by a plastic substrate has a plurality of In general, the substrates are formed by laminating substrates having an inner wiring pattern.
- a through hole is provided in the substrate as in the above embodiment, and the through hole is filled with a conductive paste 20 to form a hemispherical bump 30.
- a conductive paste 20 to form a hemispherical bump 30.
- an IC package can be manufactured.
- the terminals of the wiring pattern connected by the IC chip and the wire bonding are formed in multiple stages. Such multi-stage formation enables multi-binning.
- the inner wiring pattern 35 and the IC chip 34 are connected by wire bonding or the like, and the IC chip 34 is resin-sealed to form a semiconductor device. 36 is a sealing resin.
- a through-hole is also provided on the bottom surface of the mounting hole, and the conductive paste 20 is filled to provide a thermal via 37.
- the hemispherical bump is formed by using the conductive paste, but this embodiment is a method of manufacturing using a resin paste on which electroless copper is easily deposited.
- a resin paste from which electroless copper can be easily pulled out a paste mixed with palladium, copper, or the like can be used. The method of manufacturing the IC package according to the present embodiment will be described with reference to FIGS.
- a hole for forming a through-hole is formed in a board with copper foil attached on both sides, and the through-hole is applied (Fig. 11).
- the substrate 10 is etched on both sides to form a wiring pattern 40 on one side of the substrate 10 and a land 42 on the other side (FIG. 12).
- the resin paste 44 is filled in the holes for forming the through holes provided on the substrate 10 by the same method as in the first embodiment.
- a hemisphere 44a is formed on the side of the land 42 (Fig. 13).
- a copper plating layer 46 is provided on the outer surface of the hemispherical portion 44a and the wiring pattern 40 (FIG. 14). Since the resin paste 44 easily deposits electroless copper plating, electroless copper is selectively deposited only on the bumps and wiring pattern 40. It can be covered with the copper plating layer 46 as shown in FIG.
- the outer surface of the copper plating layer 46 is subjected to nickel plating, gold plating, and other protective plating to form a product.
- the use of the resin base 44 on which the electroless copper is easily deposited allows the copper plating layer 46 to be provided more favorably by the electroless copper plating.
- the copper plating layer 46 is thickened only by electroless copper plating.
- electroless plating is preferable.
- the electroless plating is not limited to copper plating, and other electroless plating can be used. In this case, a paste that can easily bend out the electroless plating film may be used.
- the wiring pattern 40 and the land 42 can be formed in a single-step etching process. It should be noted that the resin paste used in the present embodiment, from which the electroless copper is easily protruded, is not particularly required to have conductivity, and may be used even if it is electrically insulating.
- the through holes are formed after the holes for forming the through holes are formed in the substrate.
- this embodiment is a method of manufacturing without through hole plating.
- FIGS. 15 to 18 show the manufacturing method of this embodiment.
- a hole 14 for forming a through hole is formed on the substrate 10 on which copper foil 12 is attached and formed on both sides.
- This IC package also consists of a substrate and a hemispherical bump.
- the hemispherical bump and the wiring pattern 40 on the upper surface of the substrate 10 are electrically connected via the conductive paste 20 of the through hole 15.
- bumps are formed by filling the through hole with a resin paste that has conductivity and is easy to bend out electroless copper.
- the present invention is not limited to the electroless copper plating, and other electroless plating can be used by using a resin paste from which the electroless plating film can be easily pulled out. can do.
- Embodiments 3 and 4 described above have an advantage that the manufacturing process can be simplified since the through-hole mounting is omitted.
- the IC package obtained by these embodiments can also reinforce the bumps by covering the bumps with a copper plating layer, as in the case of the previous embodiment, and can obtain solderability and sealing of through holes. be able to.
- the bumps and the wiring patterns are electrically connected by the conductive paste filled in the through holes.
- the conductive paste has the disadvantage that the electrical resistance is higher than that of the plating layer due to the through-hole plating.
- a hole for forming a through-hole is formed in a board with copper foil applied to both sides, and after through-hole plating is performed, the board is etched on both sides to form a land and wiring pattern.
- FIG. 19 shows the configuration of an IC package obtained by the method of this embodiment.
- a conductive paste 50 having conductivity and solderability is filled in the through hole, and the hemispherical portion 50a of the bump is not covered with a plating layer or the like, and is exposed to the outside as it is.
- the IC package obtained by the method of this embodiment can be mounted as it is by soldering, and has the advantage that it is not necessary to provide a copper plating layer on the bump.
- a land 18 having a diameter larger than the diameter of the bump is formed on the bump base similarly to the above-described embodiment.
- nickel plating, gold plating or other protective plating may be applied to protect the bumps.
- solder paste is used, and the through-hole plating is omitted.
- FIG. 20 shows the configuration of an IC package obtained by the method of this embodiment.
- the conductive base 50 is filled in the through holes, the substrate 10 and the bumps are integrally formed, and the wiring pattern 5 formed by etching the copper foil on the upper surface of the substrate 10 is formed. 2 is formed.
- the IC package obtained by the method of the present embodiment is characterized in that the configuration is extremely simplified. Since the conductive paste 50 has solderability, it can be directly mounted by soldering.
- the paste was filled in the through-hole and the bump was formed integrally with the substrate.
- efficient heat dissipation was enabled by utilizing the thermal conductivity of the paste filled in the through-hole. It is possible to form an IC package with a thermal via.
- a conductive paste having good thermal conductivity a paste containing a metal powder such as copper or silver can be used.
- Fig. 21 shows an example in which an IC package formed using a conductive paste 60 having good thermal conductivity is mounted on a motherboard.
- the IC package has a hemispherical bump 60a as a connection terminal and a thermal via 62 provided on the lower surface of the mounting hole of the IC chip 34.
- the thermal via 62 is formed in the same manner as in the case of forming a hemispherical bump as a connection terminal, as described in the above embodiments. That is, in addition to through holes for forming connection terminals, through holes for forming thermal vias are provided in the IC chip mounting part, and conductive paste 60 is filled in these through holes to form bumps. I do. Then the substrate
- the upper end surface of the thermal via 62 can be exposed on the mounting surface of the chip 34, and the IC chip 34 can be directly connected to the thermal via 62.
- 64 is the motherboard insulation layer
- 66 is the connection pad
- 68 is the pre-predader
- 70 is the shield layer
- 72 is the motherboard heat conduction layer. It is.
- the hemispherical bump 60a is used for the IC package.
- the thermal via 62 is connected to the heat conductive layer 72 of the motherboard.
- the IC package and the motherboard are electrically connected, and heat is efficiently dissipated from the IC chip 34 through the thermal via 62.
- thermal vias 62 provided in the IC package of this embodiment are directly connected to the IC chip 34, heat can be efficiently dissipated from the IC chip 34.
- connection terminals are formed by plating through holes, but other methods of forming connection terminals are also applicable.
- the method of manufacturing an IC package having thermal vias according to this method is extremely effective in that thermal vias can be formed simultaneously with connection terminals.
- connection terminal and the thermal via can be formed in different steps.
- a thermal via may be formed in the IC chip mounting area using a pre-preparer in the case of multi-layer lamination, and the bump of the connection terminal portion may be formed in a later process according to the above method. it can.
- Fig. 22 and Fig. 23 are explanatory diagrams showing the appearance of the connection part when mounting an IC package having hemispherical bumps.
- Figure 74 shows how the IC package is mounted with solder 76.
- Reference numeral 78 denotes a soldering pad provided on the surface of the print substrate 74.
- Fig. 22 shows the case where the amount of solder 76 is small
- Fig. 23 shows the case of solder 76. Is large.
- the hemispherical bumps are soldered at the top.
- Solder 76 adheres in a meniscus shape around the contact portion. When the connection terminal is hemispherical in this way, the solder 76 is pulled from the outside to the contact portion of the hemispherical bump, and the solder 76 is prevented from flowing out. This makes it possible to make a reliable connection even if the amount of solder changes.
- FIG. 24 and FIG. 25 show the connection when the hemispherical bump and the wiring pattern are misaligned.
- Fig. 25 shows the case of an IC package having a flat bump for comparison. As shown in Fig. 25, in the case of an IC package with flat bumps, when the soldering pad â 8 and the bump are misaligned, the solder 76 protrudes outside the soldering pad 78. In addition, the end surface of the bump and the mounting substrate surface are close to each other, and an electrical short circuit is likely to occur between the adjacent pad 78.
- the solder 76 flows out of the soldering pad 76 because the outer surface of the bump is separated from the mounting board surface as shown in Fig. 24. This can prevent the occurrence of an electrical short circuit.
- hemispherical bumps it is possible to prevent an electrical short circuit between the patterns and to make a suitable connection, and it is possible to form connection terminals at a high density, which is preferable. It is possible to cope with increasing the number of pins.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Wire Bonding (AREA)
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU65822/94A AU6582294A (en) | 1993-04-23 | 1994-04-25 | Ic package and method of its manufacture |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5/132280 | 1993-04-23 | ||
JP13228093 | 1993-04-23 | ||
JP5/220386 | 1993-07-05 | ||
JP22038693 | 1993-07-05 | ||
JP5/339919 | 1993-11-25 | ||
JP33991993 | 1993-11-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994025984A1 true WO1994025984A1 (en) | 1994-11-10 |
Family
ID=27316467
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000692 WO1994025984A1 (en) | 1993-04-23 | 1994-04-25 | Ic package and method of its manufacture |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU6582294A (ja) |
WO (1) | WO1994025984A1 (ja) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5753976A (en) * | 1996-06-14 | 1998-05-19 | Minnesota Mining And Manufacturing Company | Multi-layer circuit having a via matrix interlayer connection |
US5814883A (en) * | 1995-10-04 | 1998-09-29 | Mitsubishi Denki Kabushiki Kaisha | Packaged semiconductor chip |
US6043559A (en) * | 1996-09-09 | 2000-03-28 | Intel Corporation | Integrated circuit package which contains two in plane voltage busses and a wrap around conductive strip that connects a bond finger to one of the busses |
EP1601017A1 (en) * | 2003-02-26 | 2005-11-30 | Ibiden Co., Ltd. | Multilayer printed wiring board |
CN110769665A (zh) * | 2018-07-27 | 2020-02-07 | 广å·æ¹éŠçµåè¡ä»œæéå ¬åž | çµç£å±èœèã线路æ¿åçµç£å±èœèçå¶å€æ¹æ³ |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01120852A (ja) * | 1987-11-04 | 1989-05-12 | Hitachi Chem Co Ltd | ãã©ã¹ããã¯ããããã£ãªã¢ |
JPH04266037A (ja) * | 1991-02-20 | 1992-09-22 | Matsushita Electric Ind Co Ltd | åå°äœçŽ åã®å®è£ æ§é äœ |
JPH05121590A (ja) * | 1991-10-24 | 1993-05-18 | Matsushita Electric Works Ltd | è¡šé¢å®è£ ååå°äœè£ 眮 |
-
1994
- 1994-04-25 AU AU65822/94A patent/AU6582294A/en not_active Abandoned
- 1994-04-25 WO PCT/JP1994/000692 patent/WO1994025984A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01120852A (ja) * | 1987-11-04 | 1989-05-12 | Hitachi Chem Co Ltd | ãã©ã¹ããã¯ããããã£ãªã¢ |
JPH04266037A (ja) * | 1991-02-20 | 1992-09-22 | Matsushita Electric Ind Co Ltd | åå°äœçŽ åã®å®è£ æ§é äœ |
JPH05121590A (ja) * | 1991-10-24 | 1993-05-18 | Matsushita Electric Works Ltd | è¡šé¢å®è£ ååå°äœè£ 眮 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5814883A (en) * | 1995-10-04 | 1998-09-29 | Mitsubishi Denki Kabushiki Kaisha | Packaged semiconductor chip |
US5753976A (en) * | 1996-06-14 | 1998-05-19 | Minnesota Mining And Manufacturing Company | Multi-layer circuit having a via matrix interlayer connection |
US6043559A (en) * | 1996-09-09 | 2000-03-28 | Intel Corporation | Integrated circuit package which contains two in plane voltage busses and a wrap around conductive strip that connects a bond finger to one of the busses |
US6440770B1 (en) | 1996-09-09 | 2002-08-27 | Intel Corporation | Integrated circuit package |
EP1601017A1 (en) * | 2003-02-26 | 2005-11-30 | Ibiden Co., Ltd. | Multilayer printed wiring board |
EP1601017A4 (en) * | 2003-02-26 | 2009-04-29 | Ibiden Co Ltd | MULTILAYER PRINTED PCB |
US7894203B2 (en) | 2003-02-26 | 2011-02-22 | Ibiden Co., Ltd. | Multilayer printed wiring board |
CN110769665A (zh) * | 2018-07-27 | 2020-02-07 | 广å·æ¹éŠçµåè¡ä»œæéå ¬åž | çµç£å±èœèã线路æ¿åçµç£å±èœèçå¶å€æ¹æ³ |
CN110769665B (zh) * | 2018-07-27 | 2023-12-05 | 广å·æ¹éŠçµåè¡ä»œæéå ¬åž | çµç£å±èœèã线路æ¿åçµç£å±èœèçå¶å€æ¹æ³ |
Also Published As
Publication number | Publication date |
---|---|
AU6582294A (en) | 1994-11-21 |
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