US20050093144A1 - Multi-chip module - Google Patents
Multi-chip module Download PDFInfo
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- US20050093144A1 US20050093144A1 US11/012,401 US1240104A US2005093144A1 US 20050093144 A1 US20050093144 A1 US 20050093144A1 US 1240104 A US1240104 A US 1240104A US 2005093144 A1 US2005093144 A1 US 2005093144A1
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- Prior art keywords
- circuit board
- laminate circuit
- laminate
- interior opening
- flip
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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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
- H01L23/28—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
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3121—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation
- H01L23/3128—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed a substrate forming part of the encapsulation the substrate having spherical bumps for external connection
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
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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
- H01L23/52—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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- 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
- H01L2224/48151—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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- 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
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73203—Bump and layer connectors
- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/065—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L27/00
- H01L25/0652—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L27/00 the devices being arranged next and on each other, i.e. mixed assemblies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00014—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/00015—Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed as prior art
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L2924/14—Integrated circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention generally relates to circuit device packages. More particularly, this invention relates to a multi-chip module (MCM) and method adapted to permit both underfilling and overmolding of surface-mounted devices on opposite surfaces of a laminate substrate within the MCM.
- MCM multi-chip module
- a flip chip is generally a surface-mounted (SM) device in the form of a monolithic semiconductor chip, such as an integrated circuit (IC) chip, having bead-like solder terminals formed on one of its surfaces.
- the terminals also referred to as solder bumps, serve to both secure the chip to a circuit board and electrically interconnect the flip chip circuitry to a conductor pattern formed on the circuit board, which may be a ceramic substrate, printed circuit board (PCB), printed wiring board (PWB), flexible circuit, or a silicon substrate.
- BGA ball grid array
- FIG. 1 An example of a BGA package 110 is shown in FIG. 1 as including an IC semiconductor chip 112 that is wire bonded to a substrate 114 , e.g., a laminate PCB, with wires 116 .
- the wires 116 are electrically connected through vias (not shown) in the substrate 114 to terminals 118 on the opposite surface of the substrate 114 .
- the terminals 118 serve as interconnects between the chip 112 and a conductor pattern on a circuit board (not shown) to which the BGA package 110 will be mounted.
- FIG. 1 An example of a BGA package 110 is shown in FIG. 1 as including an IC semiconductor chip 112 that is wire bonded to a substrate 114 , e.g., a laminate PCB, with wires 116 .
- the wires 116 are electrically connected through vias (not shown) in the substrate 114 to terminals 118 on the opposite surface of the substrate 114 .
- FIG. 2 is an example of the use of a flip chip 122 in a BGA package 120 to form a single-chip module.
- the flip chip 122 is equipped with solder bumps that form solder joint connections 126 when the chip 122 is flip-chip mounted to a conductor pattern on a substrate 124 , e.g., a high-density PCB, which can then be mounted to a circuit (mother) board (not shown) with terminals 128 on the lower surface of the substrate 124 .
- a substrate 124 e.g., a high-density PCB
- FIG. 2 shows the interior of the BGA package 120 comprising a molding compound 132 that overmolds the chip 122 .
- FIG. 2 While the packaging technique of FIG. 2 capitalizes on the processing and assembly advantages provided by flip chips and BGA's, further improvements in packaging processes and density are continuously sought. For example, the underfilling process is both cumbersome and expensive, and becomes more difficult as the number of flip chips mounted to a substrate increases, especially if the chips are to be mounted to both surfaces of the substrate.
- the present invention provides a package and packaging method that incorporate multiple surface-mounted devices, such as flip chips, mounted to a chip carrier, which in turn can be mounted onto a circuit board.
- the package is configured to provide a cost-effective, high-density multi-chip module that is also configured to facilitate underfilling and/or overmolding of circuit devices mounted on both sides of the chip carrier.
- the package of this invention generally includes a pair of laminate substrates that together form a chip carrier and input/output (I/O) interface structure for a number of chips, e.g., flip chips, wire-bonded chips and/or other surface-mount components.
- a first of the laminate substrates has a first conductor pattern on a first surface thereof and a second conductor pattern on an oppositely-disposed second surface thereof.
- the second laminate substrate is attached to the first laminate substrate, and has an interior opening therethrough that is surrounded by a frame portion.
- the frame portion has a first surface facing the first laminate substrate and an oppositely-disposed second surface on which solder terminals are present.
- One or more surface-mounted devices are mounted to each of the first and second surfaces of the first laminate substrate.
- the first and second laminate substrates are attached to each other such that the surface-mounted device mounted to the second surface of the first laminate substrate is disposed within the interior opening of the second laminate substrate.
- the present invention provides a process for forming an MCM package in which one or more surface-mounted devices are located within a cavity defined by the interior opening in the second laminate substrate.
- the second laminate substrate is preferably configured with lateral openings, preferably located in its first surface and therefore between the first and second laminate substrates. Through one of these lateral openings, a molding compound can be injected into the cavity defined by the interior opening in the second laminate substrate, with the result that the device mounted to the second surface of the first laminate substrate can be simultaneously underfilled and overmolded.
- the present invention provides a dual-sided MCM package that can be equipped with flip chips on opposite surfaces of a laminate substrate. Advantages include a relatively lowcost, electrically testable package whose surface-mounted devices can readily be both underfilled and overmolded to promote the reliability of the package.
- FIGS. 1 and 2 represent cross-sectional views of BGA packages in accordance with the prior art.
- FIG. 3 represents a cross-sectional view of a multi-chip BGA package that makes use of a pair of substrates attached together to form a chip carrier and input/output interface structure in accordance with the present invention.
- FIG. 4 is a plan view of the package of FIG. 3 , in which a mold compound is omitted to reveal flip chips mounted within the package.
- FIG. 5 is a plan view of one of the substrates of the package of FIGS. 3 and 4 .
- FIGS. 6 and 7 represent alternative configurations for gating and venting the package of FIG. 3 in accordance with the present invention.
- a flip-chip package 10 in accordance with this invention is represented in cross-section in FIG. 3 .
- the package 10 includes a pair of laminate PCB's 12 and 14 that are secured together to form a unitary chip carrier and input/output (I/O) interface structure for a number of flip chips 16 mounted to both surfaces of one of the PCB's 12 .
- the package 10 can be termed a dual-sided flip-chip MCM BGA package. While flip chips 16 are illustrated in the Figures, various types of circuit components could be present in the package 10 in addition to or in place of the flip chips 16 , for example, wire-bonded chips and/or other surface-mount components.
- the upper PCB 12 (as viewed in FIG. 3 ) is shown as a multi-layer laminate substrate, though other types of substrates could foreseeably be used.
- the flip chips 16 are mounted to opposite surfaces 18 and 20 of the PCB 12 , as can be other surface-mounted (SM) components, such that the PCB 12 will be referred to as the carrier PCB 12 .
- the chips 16 are physically and electrically connected to conductor patterns on the chip carrier PCB 12 with solder joint connections 22 formed by reflowing solder bumps on the chips 16 .
- the second PCB 14 is depicted as a two-layer laminate substrate, though again other substrate configurations are within the scope of this invention.
- One surface 24 of the PCB 14 faces the carrier PCB 12 , while the opposite surface 26 is equipped with solder balls 28 attached to bond pads 30 , through which I/O signals from the chips 16 can be communicated with a mother board (not shown) to which the package 10 is eventually mounted.
- the PCB 14 will be referred to as the I/O PCB 14 .
- the I/O PCB 14 can be attached to the carrier PCB 12 by a suitable method that allows electrical interconnection between the two PCB's 12 and 14 .
- the PCB's 12 and 14 may be attached at the manufacturing level, or in a subsequent operation with a conductive adhesive or, as represented in FIG. 3 , solder 32 . Whatever the attachment method, electrical paths must be provided between the flip chip connections 22 and the solder balls 28 , such as through metallized vias 56 through the I/O PCB 14 .
- the I/O PCB 14 is fabricated to have an interior opening 38 , with the remainder of the PCB 14 defining a frame 40 that surrounds the opening 38 .
- the opening 38 and frame 40 are illustrated as having rectangular shapes, though other shapes could be employed.
- the opening 38 in the I/O PCB 14 defines a cavity 42 in which are contained the flip chips 16 attached to the lower surface 20 of the carrier PCB 12 .
- the cavity 42 contains a compound 44 that encapsulate the flip chips 16 attached to the lower surface 20 of the carrier PCB 12 .
- the package 10 is equipped with a gate 46 and vent 48 through which a suitable polymeric material can be injected into the cavity 42 to form the compound 44 .
- the gate 46 and vent 48 are represented in FIGS. 3 through 5 as being formed by removing material from the surface 24 of the I/O PCB 14 , preferably at two opposing corners of the PCB 14 .
- the I/O PCB 14 is shown as having two slots 50 and 52 milled in its surface 24 , the wider slot 50 corresponding to the gate 46 and the narrower slot 52 corresponding to the vent 48 .
- the slots 50 and 52 extend diagonally from opposite corners of the opening 38 to the outer peripheral edge of the I/O PCB 14 .
- a film-assisted molding (FAME) technique is preferably utilized.
- FAME film-assisted molding
- a film 58 is applied to the lower surface 26 of the I/O PCB 14 prior to placement of the solder balls 28 .
- a suitable liquid polymeric material such as a thermoset epoxy, is then injected with a nozzle 60 through the gate 46 and into the cavity 42 , and is thereafter cured to form the compound 44 .
- the same polymeric material can be simultaneously injected with the nozzle 60 onto the upper surface 18 of the carrier PCB 12 to form a mold compound 54 that, as shown in FIG.
- FIG. 3 encapsulates and preferably underfills the chips 16 on the upper surface 18 of the PCB 12 .
- the gaseous contents of the cavity 42 e.g., air
- Placement of the gate 46 and vent 48 at the package corners promotes the ability of the liquid polymeric material to completely fill the cavity 42 and reduces the occurrence of voids within the compound 44 .
- FIG. 7 An alternative approach is depicted in FIG. 7 , in which the gate 46 is replaced with at least one internal gate 64 , shown in the form of a through-hole in the PCB 12 .
- the polymeric material is injected with a nozzle 62 onto the upper surface 18 of the carrier PCB 12 , and then flows downward into the cavity 42 through the internal gate 64 .
- the gaseous contents of the cavity 42 escape through the vent 48 as the cavity 42 fills with the polymeric material.
- a liquid material can be injected into the cavity 42 to both underfill and overmold the chips 16 on the lower surface 20 of the carrier PCB 12 , and can be simultaneously deposited on the upper surface 18 of the PCB 12 to encapsulate and underfill chips 16 on the upper surface 18 .
- the resulting package 10 thus has all of its chips 16 (as well as any other devices mounted to the carrier PCB 12 ), mechanically protected from extraneous damage as well as underfilled to promote the reliability of their solder connections 22 .
- the layouts of the PCB's 12 and 14 can be configured such that the package 10 can be molded in strip form, in which multiple packages 10 can be simultaneously molded in a single operation.
Abstract
A package and packaging method that incorporates multiple surface-mounted devices mounted to the package, which in turn can be mounted onto a circuit board. The package generally includes a pair of laminate substrates that together form a chip carrier and input/output (I/O) interface structure for the devices. The devices are mounted to opposite surfaces of a first of the substrates. The second substrate is attached to the first substrate, and has an interior opening therethrough. The first and second substrates are attached to each other such that devices mounted on one surface of the first substrate are disposed within the interior opening of the second laminate substrate. A mold compound can be applied to underfill and encapsulate the devices mounted to the surfaces of the first substrate.
Description
- Not applicable.
- Not applicable.
- (1) Field of the Invention
- The present invention generally relates to circuit device packages. More particularly, this invention relates to a multi-chip module (MCM) and method adapted to permit both underfilling and overmolding of surface-mounted devices on opposite surfaces of a laminate substrate within the MCM.
- (2) Description of the Related Art
- A flip chip is generally a surface-mounted (SM) device in the form of a monolithic semiconductor chip, such as an integrated circuit (IC) chip, having bead-like solder terminals formed on one of its surfaces. The terminals, also referred to as solder bumps, serve to both secure the chip to a circuit board and electrically interconnect the flip chip circuitry to a conductor pattern formed on the circuit board, which may be a ceramic substrate, printed circuit board (PCB), printed wiring board (PWB), flexible circuit, or a silicon substrate.
- While typically mounted directly to a substrate, flip chips have been incorporated into packages, an example of which is ball grid array (BGA) packages. An example of a
BGA package 110 is shown inFIG. 1 as including anIC semiconductor chip 112 that is wire bonded to asubstrate 114, e.g., a laminate PCB, withwires 116. Thewires 116 are electrically connected through vias (not shown) in thesubstrate 114 toterminals 118 on the opposite surface of thesubstrate 114. Similar to the flip-chip process, theterminals 118 serve as interconnects between thechip 112 and a conductor pattern on a circuit board (not shown) to which theBGA package 110 will be mounted.FIG. 2 is an example of the use of aflip chip 122 in aBGA package 120 to form a single-chip module. Theflip chip 122 is equipped with solder bumps that form solderjoint connections 126 when thechip 122 is flip-chip mounted to a conductor pattern on asubstrate 124, e.g., a high-density PCB, which can then be mounted to a circuit (mother) board (not shown) withterminals 128 on the lower surface of thesubstrate 124. In the case where thesubstrate 124 is a PCB, it is desirable to underfill theflip chip 122 with a filledepoxy 130 to ensure the reliability of the solderjoint connections 126. Finally,FIG. 2 shows the interior of theBGA package 120 comprising amolding compound 132 that overmolds thechip 122. - While the packaging technique of
FIG. 2 capitalizes on the processing and assembly advantages provided by flip chips and BGA's, further improvements in packaging processes and density are continuously sought. For example, the underfilling process is both cumbersome and expensive, and becomes more difficult as the number of flip chips mounted to a substrate increases, especially if the chips are to be mounted to both surfaces of the substrate. - The present invention provides a package and packaging method that incorporate multiple surface-mounted devices, such as flip chips, mounted to a chip carrier, which in turn can be mounted onto a circuit board. The package is configured to provide a cost-effective, high-density multi-chip module that is also configured to facilitate underfilling and/or overmolding of circuit devices mounted on both sides of the chip carrier.
- The package of this invention generally includes a pair of laminate substrates that together form a chip carrier and input/output (I/O) interface structure for a number of chips, e.g., flip chips, wire-bonded chips and/or other surface-mount components. A first of the laminate substrates has a first conductor pattern on a first surface thereof and a second conductor pattern on an oppositely-disposed second surface thereof. The second laminate substrate is attached to the first laminate substrate, and has an interior opening therethrough that is surrounded by a frame portion. The frame portion has a first surface facing the first laminate substrate and an oppositely-disposed second surface on which solder terminals are present. One or more surface-mounted devices are mounted to each of the first and second surfaces of the first laminate substrate. The first and second laminate substrates are attached to each other such that the surface-mounted device mounted to the second surface of the first laminate substrate is disposed within the interior opening of the second laminate substrate.
- In view of the above, the present invention provides a process for forming an MCM package in which one or more surface-mounted devices are located within a cavity defined by the interior opening in the second laminate substrate. The second laminate substrate is preferably configured with lateral openings, preferably located in its first surface and therefore between the first and second laminate substrates. Through one of these lateral openings, a molding compound can be injected into the cavity defined by the interior opening in the second laminate substrate, with the result that the device mounted to the second surface of the first laminate substrate can be simultaneously underfilled and overmolded. As such, the present invention provides a dual-sided MCM package that can be equipped with flip chips on opposite surfaces of a laminate substrate. Advantages include a relatively lowcost, electrically testable package whose surface-mounted devices can readily be both underfilled and overmolded to promote the reliability of the package.
- Other objects and advantages of this invention will be better appreciated from the following detailed description.
-
FIGS. 1 and 2 represent cross-sectional views of BGA packages in accordance with the prior art. -
FIG. 3 represents a cross-sectional view of a multi-chip BGA package that makes use of a pair of substrates attached together to form a chip carrier and input/output interface structure in accordance with the present invention. -
FIG. 4 is a plan view of the package ofFIG. 3 , in which a mold compound is omitted to reveal flip chips mounted within the package. -
FIG. 5 is a plan view of one of the substrates of the package ofFIGS. 3 and 4 . -
FIGS. 6 and 7 represent alternative configurations for gating and venting the package ofFIG. 3 in accordance with the present invention. - A flip-
chip package 10 in accordance with this invention is represented in cross-section inFIG. 3 . As shown, thepackage 10 includes a pair of laminate PCB's 12 and 14 that are secured together to form a unitary chip carrier and input/output (I/O) interface structure for a number offlip chips 16 mounted to both surfaces of one of the PCB's 12. As such, thepackage 10 can be termed a dual-sided flip-chip MCM BGA package. Whileflip chips 16 are illustrated in the Figures, various types of circuit components could be present in thepackage 10 in addition to or in place of theflip chips 16, for example, wire-bonded chips and/or other surface-mount components. - The upper PCB 12 (as viewed in
FIG. 3 ) is shown as a multi-layer laminate substrate, though other types of substrates could foreseeably be used. Theflip chips 16 are mounted toopposite surfaces PCB 12, as can be other surface-mounted (SM) components, such that the PCB 12 will be referred to as thecarrier PCB 12. In accordance with flip-chip mounting techniques, thechips 16 are physically and electrically connected to conductor patterns on thechip carrier PCB 12 with solderjoint connections 22 formed by reflowing solder bumps on thechips 16. - The
second PCB 14 is depicted as a two-layer laminate substrate, though again other substrate configurations are within the scope of this invention. Onesurface 24 of thePCB 14 faces thecarrier PCB 12, while theopposite surface 26 is equipped withsolder balls 28 attached tobond pads 30, through which I/O signals from thechips 16 can be communicated with a mother board (not shown) to which thepackage 10 is eventually mounted. As such, the PCB 14 will be referred to as the I/O PCB 14. The I/O PCB 14 can be attached to thecarrier PCB 12 by a suitable method that allows electrical interconnection between the two PCB's 12 and 14. The PCB's 12 and 14 may be attached at the manufacturing level, or in a subsequent operation with a conductive adhesive or, as represented inFIG. 3 ,solder 32. Whatever the attachment method, electrical paths must be provided between theflip chip connections 22 and thesolder balls 28, such as through metallizedvias 56 through the I/O PCB 14. - As is apparent from
FIGS. 3, 4 and 5, the I/O PCB 14 is fabricated to have aninterior opening 38, with the remainder of thePCB 14 defining aframe 40 that surrounds theopening 38. The opening 38 andframe 40 are illustrated as having rectangular shapes, though other shapes could be employed. As a result of the manner in which the PCB's 12 and 14 are assembled, theopening 38 in the I/O PCB 14 defines acavity 42 in which are contained theflip chips 16 attached to thelower surface 20 of thecarrier PCB 12. As also depicted inFIG. 3 , thecavity 42 contains acompound 44 that encapsulate theflip chips 16 attached to thelower surface 20 of thecarrier PCB 12. For this purpose, thepackage 10 is equipped with agate 46 and vent 48 through which a suitable polymeric material can be injected into thecavity 42 to form thecompound 44. Thegate 46 andvent 48 are represented inFIGS. 3 through 5 as being formed by removing material from thesurface 24 of the I/O PCB 14, preferably at two opposing corners of thePCB 14. InFIG. 5 , the I/O PCB 14 is shown as having twoslots surface 24, thewider slot 50 corresponding to thegate 46 and thenarrower slot 52 corresponding to thevent 48. Theslots O PCB 14. When the I/O PCB 14 is assembled to thecarrier PCB 12, theslots gate 46 andvent 48 are buried at opposite corners of thepackage 10. - To fill the
cavity 42 with themold compound 44, a film-assisted molding (FAME) technique is preferably utilized. As represented inFIG. 6 , afilm 58 is applied to thelower surface 26 of the I/O PCB 14 prior to placement of thesolder balls 28. A suitable liquid polymeric material, such as a thermoset epoxy, is then injected with anozzle 60 through thegate 46 and into thecavity 42, and is thereafter cured to form thecompound 44. As depicted inFIG. 6 , the same polymeric material can be simultaneously injected with thenozzle 60 onto theupper surface 18 of thecarrier PCB 12 to form amold compound 54 that, as shown inFIG. 3 , encapsulates and preferably underfills thechips 16 on theupper surface 18 of thePCB 12. As thecavity 42 fills with the polymeric material, the gaseous contents of thecavity 42, e.g., air, escape through thevent 48. Placement of thegate 46 and vent 48 at the package corners promotes the ability of the liquid polymeric material to completely fill thecavity 42 and reduces the occurrence of voids within thecompound 44. An alternative approach is depicted inFIG. 7 , in which thegate 46 is replaced with at least oneinternal gate 64, shown in the form of a through-hole in thePCB 12. In this embodiment, the polymeric material is injected with anozzle 62 onto theupper surface 18 of thecarrier PCB 12, and then flows downward into thecavity 42 through theinternal gate 64. As before, the gaseous contents of thecavity 42 escape through thevent 48 as thecavity 42 fills with the polymeric material. - From the above description, it can be appreciated that a liquid material can be injected into the
cavity 42 to both underfill and overmold thechips 16 on thelower surface 20 of thecarrier PCB 12, and can be simultaneously deposited on theupper surface 18 of thePCB 12 to encapsulate andunderfill chips 16 on theupper surface 18. The resultingpackage 10 thus has all of its chips 16 (as well as any other devices mounted to the carrier PCB 12), mechanically protected from extraneous damage as well as underfilled to promote the reliability of theirsolder connections 22. Also from the above description, it can be appreciated that the layouts of the PCB's 12 and 14 can be configured such that thepackage 10 can be molded in strip form, in whichmultiple packages 10 can be simultaneously molded in a single operation. In so doing, the manufacturing efficiency of thepackage 10 is increased while decreasing costs. The result is a cost-effective, high-density packaging technique by which various electrical components (flip chips 16, etc.) are mechanically protected within an electrically-testable package 10. These advantages are achieved while eliminating a separate underfill process, preferably utilizing instead a single molding operation during which chips 16 on bothsurfaces carrier PCB 12 are simultaneously underfilled and overmolded. - While the invention has been described in terms of a preferred embodiment, it is apparent that other forms could be adopted by one skilled in the art. Accordingly, the scope of the invention is to be limited only by the following claims.
Claims (5)
1. A multi-chip module comprising:
a first laminate circuit board having a first conductor pattern on a first surface thereof and a second conductor pattern on an oppositely-disposed second surface thereof;
a second laminate circuit board attached to the first laminate circuit board, the second laminate circuit board having an interior opening therethrough and a frame portion surrounding the interior opening, the frame portion having a first surface facing the first laminate circuit board and an oppositely-disposed second surface on which solder terminals are present, the solder terminals of the second laminate circuit board being electrically interconnected with the first and second conductor patterns of the first laminate circuit board through metallized vias through the frame portion of the second laminate circuit board;
first and second slots in the first surface of the second laminate circuit board so as to define first and second lateral openings between the first and second laminate circuit boards, the first and second lateral openings interconnecting the interior opening of the second laminate circuit board with an outer perimeter of the second laminate circuit board;
at least a first flip-chip device on the first surface of the first laminate circuit board and electrically connected to the first conductor pattern with solder connections;
at least a second flip-chip device on the second surface of the first laminate circuit board and electrically connected to the second conductor pattern with solder connections, the first and second laminate circuit boards being attached so that the second flip-chip device is disposed within the interior opening of the second laminate circuit board; and
a molding compound within the interior opening of the second laminate circuit board and both underfilling and encapsulating the second flip-chip device and the solder connections thereof and filling the first and second lateral openings between the first and second laminate circuit boards.
2. (canceled)
3. (cancelled)
4. A multi-chip module according to claim 1 , wherein the second laminate circuit board and the interior opening therein have rectangular shapes, the first lateral opening interconnects a first corner of the interior opening and an adjacent first corner of the second laminate circuit board, and the second lateral opening interconnects a second corner of the interior opening and an adjacent second corner of the second laminate circuit board, the first corners of the interior opening and the second laminate circuit board being diagonally-opposite the second corners of the interior opening and the second laminate circuit board.
5. A multi-chip module according to claim 1 , further comprising a molding compound that encapsulates the first flip-chip device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/012,401 US20050093144A1 (en) | 2002-12-17 | 2004-12-15 | Multi-chip module |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/321,900 US6833628B2 (en) | 2002-12-17 | 2002-12-17 | Mutli-chip module |
US11/012,401 US20050093144A1 (en) | 2002-12-17 | 2004-12-15 | Multi-chip module |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/321,900 Continuation US6833628B2 (en) | 2002-12-17 | 2002-12-17 | Mutli-chip module |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050093144A1 true US20050093144A1 (en) | 2005-05-05 |
Family
ID=32393007
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/321,900 Expired - Fee Related US6833628B2 (en) | 2002-12-17 | 2002-12-17 | Mutli-chip module |
US11/012,401 Abandoned US20050093144A1 (en) | 2002-12-17 | 2004-12-15 | Multi-chip module |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/321,900 Expired - Fee Related US6833628B2 (en) | 2002-12-17 | 2002-12-17 | Mutli-chip module |
Country Status (3)
Country | Link |
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US (2) | US6833628B2 (en) |
EP (1) | EP1432033B1 (en) |
DE (1) | DE60309422T2 (en) |
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Also Published As
Publication number | Publication date |
---|---|
EP1432033A1 (en) | 2004-06-23 |
DE60309422D1 (en) | 2006-12-14 |
EP1432033B1 (en) | 2006-11-02 |
US6833628B2 (en) | 2004-12-21 |
US20040113281A1 (en) | 2004-06-17 |
DE60309422T2 (en) | 2007-10-11 |
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