US20040163248A1 - Metal core substrate printed wiring board enabling thermally enhanced ball grid array ( BGA) packages and method - Google Patents
Metal core substrate printed wiring board enabling thermally enhanced ball grid array ( BGA) packages and method Download PDFInfo
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- US20040163248A1 US20040163248A1 US10/784,813 US78481304A US2004163248A1 US 20040163248 A1 US20040163248 A1 US 20040163248A1 US 78481304 A US78481304 A US 78481304A US 2004163248 A1 US2004163248 A1 US 2004163248A1
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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
- H05K3/44—Manufacturing insulated metal core circuits or other insulated electrically conductive core circuits
- H05K3/445—Manufacturing insulated metal core circuits or other insulated electrically conductive core circuits having insulated holes or insulated via connections through the metal core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3677—Wire-like or pin-like cooling fins or heat sinks
-
- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4602—Manufacturing multilayer circuits characterized by a special circuit board as base or central core whereon additional circuit layers are built or additional circuit boards are laminated
- H05K3/4608—Manufacturing multilayer circuits characterized by a special circuit board as base or central core whereon additional circuit layers are built or additional circuit boards are laminated comprising an electrically conductive base or core
-
- 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
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09536—Buried plated through-holes, i.e. plated through-holes formed in a core before lamination
-
- 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
- H05K2201/09209—Shape and layout details of conductors
- H05K2201/095—Conductive through-holes or vias
- H05K2201/09554—Via connected to metal substrate
-
- 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
- H05K2201/09209—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
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/14—Related to the order of processing steps
- H05K2203/143—Treating holes before another process, e.g. coating holes before coating the substrate
-
- 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
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
- H05K3/427—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in metal-clad substrates
-
- 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
- H05K3/46—Manufacturing multilayer circuits
- H05K3/4611—Manufacturing multilayer circuits by laminating two or more circuit boards
- H05K3/4641—Manufacturing multilayer circuits by laminating two or more circuit boards having integrally laminated metal sheets or special power cores
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S428/00—Stock material or miscellaneous articles
- Y10S428/901—Printed circuit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
- Y10T29/49165—Manufacturing circuit on or in base by forming conductive walled aperture in base
Definitions
- the C 2 BGAs are fabricated using a complicated etching donut isolation method, resulting in copper islands on the core that are suspended by some isolation material, and then followed by surface processing and photo via steps. The incurred cost for the complex steps and the resulting complex structure is significant.
- the Ball Grid Array is an advanced array package for fine pitch, high pin count semiconductor packaging, which is used normally in a multiple-layer chip-up printed wiring board (PWB) substrate for housing the integrated circuit structure in today's IC industry.
- PWB printed wiring board
- the heat dissipation is a major concern with the arrival of high speed CPUs such as the Pentium II & III, as well as high speed graphics, networking, DSP, and programmable logic chips.
- Better thermal BGA packaging solutions are required to fulfill the need of IC products in the 21 century.
- the object of this invention is to provide a new and simpler PWB structure and method with comparable or better thermal performance, resulting in lower cost and better reliability.
- High degree of flexibility in choice of material and layer counts and layer thickness allows for a wide range of applications in packaging and high density printed circuit board or PWB.
- the plated copper vias also allow for better thermal performance and result in better overall thermal performance for the resulting package.
- FIG. 1A shows, in section the initial metal core structure incorporating the invention
- FIG. 1B shows the metal core structure after the addition of two additional functional layers on respective glass fiber layers, incorporating the invention
- FIG. 1C shows a five-layer structure incorporating the invention
- FIG. 1D shows the use of a solder mask coating on the structure of FIG. 1C
- FIG. 2 illustrates a type 1 via according to the invention
- FIG. 3 illustrates a type 2 via according to the invention
- FIG. 4 illustrates a type 3 via according to the invention
- FIG. 5 illustrates a sectional view of an overall structure incorporating the invention
- FIG. 6 is a perspective view of a finished BGA IC package with a substrate incorporating the invention, mounted on a PWB which can either be of a conventional laminated board or one that incorporates the invention.
- FIG. 1A shows the structure during the initial metal core 110 forming stage.
- FIG. 1B shows the structure after the first two build up layers 120 are fabricated.
- FIG. 1B shows two drilled Plated Through Holes (PTH) 220 in the structure. It can be the complete PWB structure if a 3-layer structure 210 - 110 - 210 is desired, which is simpler and less costly. Please note that the ⁇ fraction (1/3) ⁇ oz copper foil 210 and the 5-10 oz copper core 110 are separated with insulating glass fiber prepreg layers 230 . Also the blind or laser drilled & plated via 240 is used for connecting to the core 110 as ground.
- the five-layer structure in FIG. 1C is intended for more complex and high density applications.
- FIG. 1C is intended for more complex and high density applications.
- FIG. 1C shows two extra build-up layers 310 , with build-up vias 320 , and a PTH 220 .
- FIG. 1C shows two extra build-up layers 310 , with build-up vias 320 , and a PTH 220 .
- Type 1 via 220 as illustrated in FIG. 2 is for implementing the majority of the vias in the structure also shown in FIG. 1B, FIG. 1C. It is isolated from the core and is connected to the outer layers through build-up vias 320 that are either laser drilled or controlled depth mechanically drilled.
- Type 2 via is a via that is connected with the core, which is typically used as a ground plane. It is implemented by a through hole drill 330 directly on the core 110 and followed by plating, which results in side-wall connection with the core.
- the advantage of the type 2 via is that it provides a direct thermal transfer path from the top layer 310 to the core 110 and then to the bottom layer 350 , ideal for implementing thermal vias in packaging applications.
- the only drawback with type 2 via is that the side-wall plating has interface with various layers including the core 110 and the prepreg 230 , as well as with the interface between the conductive layers 210 , 310 and the prepreg, which if not properly processed, will contain micro-cracks that allow moisture to penetrate through. The micro-cracks may result in delamination of the interface between the core 110 and the prepreg 230 .
- Type 3 via is also a via that connects to the ground plane on the core 110 , and also provides good thermal path to the core 110 . It is implemented by build-up core vias 240 and 320 through laser or controlled depth drill, also shown in FIG. 1B and FIG 1 C. It is good for thermal performance and does not have the reliability drawback as does the type 2 via.
- the preferred choice of the metal core 110 is copper C194 foil of 5-10 oz, or 5-15 mils thickness, as shown in FIG. 1A.
- the liquid to plug the metal core holes 120 can be PHP900 or equivalent materials.
- the inner prepreg 230 is either BT (bismaleimide triazine) or 47N with glass fiber, of 1.5 to 3 mil thickness.
- the glass fiber ingredient allows for structural enhancement against thermal expansion coefficient mismatch between the metal core 110 and the prepreg material 230 .
- the outer prepreg 340 can be either B.T. or R.C.C. (Resin-Coated-Copper) material, typically used for laser-drilled build-up.
- the thickness of the outer preg 340 is also within the range of 1.5 to 3 mils.
- the copper foil 210 used in the non-core layers can be of ⁇ fraction (1/3) ⁇ oz thickness, though a wide thickness range is appropriate ( ⁇ fraction (1/8) ⁇ , ⁇ fraction (1/4 ) ⁇ , or ⁇ fraction (1/2) ⁇ oz) for various applications.
- Singulation lines at the border of each substrate unit can be pre-drilled or pre-etched, during the first via drill-etch step, for easy singulation in strip or singulated delivery format.
- Liquid plug the holes 120 (as the hatched areas shown in FIG. 1A).
- the liquid plugging 120 may not be necessary, as the inner prepreg 230 will naturally flow and fill the holes during lamination. For thick cores, it is better to plug the holes first.
- Prepreg laminations 230 and 340 For example, 3 -mil prepregs with 1 ⁇ 3 oz copper foil is used in FIG. 1C. Note that for the reason of maintaining symmetry, one prepreg layer for each of the top and the bottom side is laminated at the same time.
- Drill holes for the through vias isolated from the core is about 10 mils laser drill or controlled-depth mechanical drill for vias that are to be connected to the core, with the diameter in the range of 2 mils to 6 mils, as shown in FIG. 1B.
- the liquid plugging material 120 which is the prepreg that flows into the first drill hole in step 2, isolates the plated vias 220 from the core 110 .
- Laminate outer prepreg layers 310 and 340 with BT or R.C.C. material If a 3-layer only structure is desired, the outer prepreg layers 310 and 340 are not needed. With the same principle, if a 4-layer only structure is desired, then the bottom BT or R.C.C. layer is not required.
- Singulation lines at the border of each substrate unit can be pre-drilled or pre-etched, during the first via drill-etch step, for easy singulation in strip or singulated delivery format.
Abstract
A thermally enhanced face-up BGA substrate consists of a metal (copper) core, layers, dielectric layers, conductive through-core and build-up vias. It is a new and simple structure with better thermal performance, resulting in lower cost and better reliability. Moreover, high degree of flexibility in choice of material and layer counts as well as layer thickness allows for a wide range of applications in packaging and high density printed circuit board.
Description
- The present application is based on provisional application Serial No. 60/128,948 filed Apr. 13, 1999 entitled METAL CORE SUBSTRATE ENABLING THERMALLY ENHANCED BALL GRID ARRAY PACKAGES.
- Prolinx C2BGA
- The C2BGAs are fabricated using a complicated etching donut isolation method, resulting in copper islands on the core that are suspended by some isolation material, and then followed by surface processing and photo via steps. The incurred cost for the complex steps and the resulting complex structure is significant.
- The Ball Grid Array (BGA) is an advanced array package for fine pitch, high pin count semiconductor packaging, which is used normally in a multiple-layer chip-up printed wiring board (PWB) substrate for housing the integrated circuit structure in today's IC industry. However, the heat dissipation is a major concern with the arrival of high speed CPUs such as the Pentium II & III, as well as high speed graphics, networking, DSP, and programmable logic chips. Better thermal BGA packaging solutions are required to fulfill the need of IC products in the 21 century.
- The object of this invention is to provide a new and simpler PWB structure and method with comparable or better thermal performance, resulting in lower cost and better reliability. High degree of flexibility in choice of material and layer counts and layer thickness allows for a wide range of applications in packaging and high density printed circuit board or PWB. The plated copper vias also allow for better thermal performance and result in better overall thermal performance for the resulting package.
- The processing steps are also ones that have proven to be practical for implementing high density interconnect for packaging applications.
- The above and other objects, advantages and features of the invention will become more apparent when considered with the following description when taken in conjunction with the accompanying drawings in which like reference characters identify corresponding components or elements and wherein:
- FIG. 1A shows, in section the initial metal core structure incorporating the invention,
- FIG. 1B shows the metal core structure after the addition of two additional functional layers on respective glass fiber layers, incorporating the invention,
- FIG. 1C shows a five-layer structure incorporating the invention,
- FIG. 1D shows the use of a solder mask coating on the structure of FIG. 1C,
- FIG. 2 illustrates a type1 via according to the invention,
- FIG. 3 illustrates a type2 via according to the invention,
- FIG. 4 illustrates a type3 via according to the invention,
- FIG. 5 illustrates a sectional view of an overall structure incorporating the invention, and
- FIG. 6 is a perspective view of a finished BGA IC package with a substrate incorporating the invention, mounted on a PWB which can either be of a conventional laminated board or one that incorporates the invention.
- Structure
- FIG. 1A shows the structure during the
initial metal core 110 forming stage. FIG. 1B shows the structure after the first two build uplayers 120 are fabricated. FIG. 1B shows two drilled Plated Through Holes (PTH) 220 in the structure. It can be the complete PWB structure if a 3-layer structure 210-110-210 is desired, which is simpler and less costly. Please note that the {fraction (1/3)} ozcopper foil 210 and the 5-10oz copper core 110 are separated with insulating glassfiber prepreg layers 230. Also the blind or laser drilled & plated via 240 is used for connecting to thecore 110 as ground. The five-layer structure in FIG. 1C is intended for more complex and high density applications. FIG. 1C shows two extra build-up layers 310, with build-up vias 320, and aPTH 220. In the following discussion, we will focus on the five-layer structure depicted in FIG. 1C, which includes three distinct types of vias implemented in the invention. - Type1 via 220 as illustrated in FIG. 2, is for implementing the majority of the vias in the structure also shown in FIG. 1B, FIG. 1C. It is isolated from the core and is connected to the outer layers through build-
up vias 320 that are either laser drilled or controlled depth mechanically drilled. - Type2 via, as illustrated in FIG. 3, is a via that is connected with the core, which is typically used as a ground plane. It is implemented by a
through hole drill 330 directly on thecore 110 and followed by plating, which results in side-wall connection with the core. - The advantage of the type2 via is that it provides a direct thermal transfer path from the
top layer 310 to thecore 110 and then to thebottom layer 350, ideal for implementing thermal vias in packaging applications. - The only drawback with type2 via is that the side-wall plating has interface with various layers including the
core 110 and theprepreg 230, as well as with the interface between theconductive layers core 110 and theprepreg 230. - Type3 via, as illustrated in FIG. 4, is also a via that connects to the ground plane on the
core 110, and also provides good thermal path to thecore 110. It is implemented by build-upcore vias - Materials
- The preferred choice of the
metal core 110 is copper C194 foil of 5-10 oz, or 5-15 mils thickness, as shown in FIG. 1A. The liquid to plug themetal core holes 120 can be PHP900 or equivalent materials. - The
inner prepreg 230 is either BT (bismaleimide triazine) or 47N with glass fiber, of 1.5 to 3 mil thickness. The glass fiber ingredient allows for structural enhancement against thermal expansion coefficient mismatch between themetal core 110 and theprepreg material 230. - The
outer prepreg 340 can be either B.T. or R.C.C. (Resin-Coated-Copper) material, typically used for laser-drilled build-up. The thickness of the outer preg 340 is also within the range of 1.5 to 3 mils. Thecopper foil 210 used in the non-core layers can be of {fraction (1/3)} oz thickness, though a wide thickness range is appropriate ( {fraction (1/8)}, {fraction (1/4)}, or {fraction (1/2)} oz) for various applications. - Process
- The following describes a preferred process step sequence, though variations can be adopted by those familiar with the art of printed circuit board and HDI (high density interconnect) fabrication.
- 1. Starting with the
metal core 110, drill or etch holes at the through-core vias sites, as shown in FIG. 1B and FIG. 1C, with hole sizes around 25 mils (15 mil to 40 mils is the allowable range for BGA applications). Note that typical panel sizes are 12″×18″, or 18″33 24″, or variations hereof. Black oxide processing is performed on the metal surface for better adhesion to thelaminated prepreg layer - Singulation lines at the border of each substrate unit can be pre-drilled or pre-etched, during the first via drill-etch step, for easy singulation in strip or singulated delivery format.
- 2. Liquid (PHP900) plug the holes120 (as the hatched areas shown in FIG. 1A). In the case of a
thinner core 110, such as around 5 mils, the liquid plugging 120 may not be necessary, as theinner prepreg 230 will naturally flow and fill the holes during lamination. For thick cores, it is better to plug the holes first. - 3. Prepreg laminations230 and 340. For example, 3 -mil prepregs with ⅓ oz copper foil is used in FIG. 1C. Note that for the reason of maintaining symmetry, one prepreg layer for each of the top and the bottom side is laminated at the same time.
- 4. Drill holes for the through vias isolated from the core. The diameter of the drill is about 10 mils laser drill or controlled-depth mechanical drill for vias that are to be connected to the core, with the diameter in the range of 2 mils to 6 mils, as shown in FIG. 1B. Note that the
liquid plugging material 120 which is the prepreg that flows into the first drill hole in step 2, isolates the plated vias 220 from thecore 110. - 5. Transfer
inner layers - 6. Laminate outer prepreg layers310 and 340 with BT or R.C.C. material. If a 3-layer only structure is desired, the outer prepreg layers 310 and 340 are not needed. With the same principle, if a 4-layer only structure is desired, then the bottom BT or R.C.C. layer is not required.
- 7. Form build-up via
holes 320 by Laser hole drill or controlled-depth mechanical drill. - 8. Mechanical through hole drill for type2 via 330 if desired.
- 9. Plating
copper - 10. The rest of the steps depend on Ni/Au plating technology and application needs. This includes imaging transfer for outer layers and Ni/Au plating420.
- 11.
Solder mask 410 coating, as shown in FIG. D. - 12. Finishing: Singulating the panel into individual units or into strips for packaging assembly.
- Advantages
- 1. Efficient symmetric layer and via structures for high thermal conductance.
- 2. Achieving same or better thermal performance comparing to prior art, with mature processing technology and proven materials.
- 3. Requires only incremental cost increase for offering better performance than Plastic Ball Grid Array (PBGA).
- Feature of the Invention
- 1. New copper-core based structure for chip-up high thermal performance package using 3-layer (core+1-top +1-bottom), 4-layer (core+2-top+1-bottom), and 5-layer (core+2-top+2-bottom). Moreover, 5 or more layers can be built easily. The 3- and 5-layer options are symmetric, with better warpage prevention.
- 2. The use of drilling/etching, optional liquid-filled, laminating, drilling, and plating process steps for forming the through core via holes.
- 3. The combination of laser blind vias build-up on top of the metal core structure, enabling additional build-up layers for high density applications.
- 4. Efficient thermal vias by plating build-up and connecting to the core from both the top and bottom sides.
- 5. Singulation lines at the border of each substrate unit can be pre-drilled or pre-etched, during the first via drill-etch step, for easy singulation in strip or singulated delivery format.
- 6. Applications: a) Metal core based substrates for thermally enhanced fine-pitch BGAs, and b) Metal core based high density boards such as for high thermal output SDRAM DIMM modules.
- While the invention has been described in relation to preferred embodiments of the invention, it will be appreciated that other embodiments, adaptations and modifications of the invention will be apparent to those skilled in the art.
Claims (16)
1. A method of making a thermally enhanced printed circuit wiring board substrate for ball grid integrated circuit packages comprising the steps of:
a) providing an initial thin conductive metal core having oppositely facing surfaces,
b) forming one or more holes in said metal core at each of a plurality of through-core via sites,
c) laminating a thin rigidifying non-conductive dielectric sheet to each said oppositely facing surfaces, respectively, and
d) applying at least one thin conductive layer on a surface of one of said thin rigidifying non-conductive sheets and making at least one electrical connection to said initial thin conductive metal core at one of said plurality of through-core via sites.
2. The method defined in claim 1 including the step of making one or more of Type 1 vias as defined herein at one or more via sites.
3. The method defined in claim 1 including the step of forming one or more Type 2 vias as defined herein at one or more via.
4. The method defined in claim 1 including the step of forming one or more Type 3 vias as defined herein at one or more via.
5. The method defined in claim 2 including the step of forming one or more Type 2 or Type 3 via at one or more via sites.
6. The method defined in claim 4 wherein said Type 3 via is isolated from the core and connected to the outer layer to build up vias.
7. The method defined in claim 3 wherein said vias are made by through-hole plating directly to the core layer and followed by plating resulting in sidewall connection with the core.
8. A method defined in claim 1 wherein said plurality of through-core via sites are drilled, plated through-holes (PTH).
9. The method defined in claim 1 wherein said vias are made by printing build-up and connection to the core in both top and bottom sides thereof.
10. The method defined in claim 1 including the step of forming singulation lines at the border of said substrate which can be predrilled or pre-etched during the first via drill step for each singulation in strip or singulated to delivery format.
11. A thermally enhanced printed circuit (PC) wiring board for ball grid integrated circuit packages comprising a relatively thin, conductive metal core layer having oppositely facing surfaces and one or more holes in the metal core at each of a plurality of through-core via sites,
a first and second thin rigidifying non-conductive laminate sheet attached to said oppositely facing surfaces, respectively, and
at least one conductive circuit pattern on at least one of said thin rigidifying non-conductive sheets and a plurality of vias thereon.
12. The PC wiring board defined in claim 11 including a plurality of vias made by plating build-up and connecting to the core from both the top and bottom sides thereof.
13. The PC wiring board defined in claim 11 wherein said conductive metal core layer is copper in the range of 5-15 mils think and said laminate sheets are fiberglass.
14. The PC wiring board defined in claim 13 including one or more additional non-conductive and conductive layers thereon.
15. The PC wiring board defined in claim 11 including a plurality of vias selected from Type 1, Type 2 or Type 3 vias as defined herein.
16. The PC wiring board defined in claim 12 including a plurality of vias selected from Type 1, Type 2 or Type 3 vias as defined herein.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/784,813 US20040163248A1 (en) | 1999-04-13 | 2004-02-24 | Metal core substrate printed wiring board enabling thermally enhanced ball grid array ( BGA) packages and method |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12894899P | 1999-04-13 | 1999-04-13 | |
US09/544,263 US6711812B1 (en) | 1999-04-13 | 2000-04-06 | Method of making metal core substrate printed circuit wiring board enabling thermally enhanced ball grid array (BGA) packages |
US10/784,813 US20040163248A1 (en) | 1999-04-13 | 2004-02-24 | Metal core substrate printed wiring board enabling thermally enhanced ball grid array ( BGA) packages and method |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/544,263 Division US6711812B1 (en) | 1999-04-13 | 2000-04-06 | Method of making metal core substrate printed circuit wiring board enabling thermally enhanced ball grid array (BGA) packages |
Publications (1)
Publication Number | Publication Date |
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US20040163248A1 true US20040163248A1 (en) | 2004-08-26 |
Family
ID=26827102
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/544,263 Expired - Fee Related US6711812B1 (en) | 1999-04-13 | 2000-04-06 | Method of making metal core substrate printed circuit wiring board enabling thermally enhanced ball grid array (BGA) packages |
US10/784,813 Abandoned US20040163248A1 (en) | 1999-04-13 | 2004-02-24 | Metal core substrate printed wiring board enabling thermally enhanced ball grid array ( BGA) packages and method |
Family Applications Before (1)
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US09/544,263 Expired - Fee Related US6711812B1 (en) | 1999-04-13 | 2000-04-06 | Method of making metal core substrate printed circuit wiring board enabling thermally enhanced ball grid array (BGA) packages |
Country Status (6)
Country | Link |
---|---|
US (2) | US6711812B1 (en) |
JP (1) | JP2002541680A (en) |
CN (1) | CN1157773C (en) |
AU (1) | AU4139500A (en) |
TW (1) | TW463537B (en) |
WO (1) | WO2000062337A1 (en) |
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US7602062B1 (en) * | 2005-08-10 | 2009-10-13 | Altera Corporation | Package substrate with dual material build-up layers |
US20130098669A1 (en) * | 2011-10-21 | 2013-04-25 | Fujitsu Limited | Wiring substrate and manufacturing method for wiring substrate |
USRE45637E1 (en) | 2005-08-29 | 2015-07-28 | Stablcor Technology, Inc. | Processes for manufacturing printed wiring boards |
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Cited By (10)
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US7602062B1 (en) * | 2005-08-10 | 2009-10-13 | Altera Corporation | Package substrate with dual material build-up layers |
US8163642B1 (en) * | 2005-08-10 | 2012-04-24 | Altera Corporation | Package substrate with dual material build-up layers |
USRE45637E1 (en) | 2005-08-29 | 2015-07-28 | Stablcor Technology, Inc. | Processes for manufacturing printed wiring boards |
US20080011507A1 (en) * | 2006-07-14 | 2008-01-17 | Vasoya Kalu K | Build-up printed wiring board substrate having a core layer that is part of a circuit |
US8203080B2 (en) | 2006-07-14 | 2012-06-19 | Stablcor Technology, Inc. | Build-up printed wiring board substrate having a core layer that is part of a circuit |
US9408314B2 (en) | 2006-07-14 | 2016-08-02 | Stablcor Technology Inc. | Build-up printed wiring board substrate having a core layer that is part of a circuit |
US20090141456A1 (en) * | 2007-11-30 | 2009-06-04 | Itt Manufacturing Enterprises, Inc. | Multilayer, thermally-stabilized substrate structures |
US20130098669A1 (en) * | 2011-10-21 | 2013-04-25 | Fujitsu Limited | Wiring substrate and manufacturing method for wiring substrate |
US8878076B2 (en) * | 2011-10-21 | 2014-11-04 | Fujitsu Limited | Wiring substrate and manufacturing method for wiring substrate |
US9332632B2 (en) | 2014-08-20 | 2016-05-03 | Stablcor Technology, Inc. | Graphene-based thermal management cores and systems and methods for constructing printed wiring boards |
Also Published As
Publication number | Publication date |
---|---|
JP2002541680A (en) | 2002-12-03 |
AU4139500A (en) | 2000-11-14 |
CN1157773C (en) | 2004-07-14 |
TW463537B (en) | 2001-11-11 |
US6711812B1 (en) | 2004-03-30 |
CN1346513A (en) | 2002-04-24 |
WO2000062337A1 (en) | 2000-10-19 |
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