US20080067650A1 - Electronic component package with EMI shielding - Google Patents
Electronic component package with EMI shielding Download PDFInfo
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- US20080067650A1 US20080067650A1 US11/522,016 US52201606A US2008067650A1 US 20080067650 A1 US20080067650 A1 US 20080067650A1 US 52201606 A US52201606 A US 52201606A US 2008067650 A1 US2008067650 A1 US 2008067650A1
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- substrate
- component
- vent opening
- encapsulant
- package
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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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- 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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- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3135—Double encapsulation or coating and encapsulation
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- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
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Definitions
- an electronic component package having EMI shielding comprising a substrate having a mounting area for an electronic component, an electronic component located on the mounting area, a conductive enclosure having a top and downwardly extending sides enclosing the mounting area and defining a shielded space above the mounting area, and a vent opening extending through the substrate, the opening located in the mounting area for venting the shielded space.
- the substrate includes a ground trace or other grounding means and the sides of the conductive enclosure make contact with the ground trace or grounding means.
- the substrate 11 has a plurality of balls of solder 18 arranged in a grid pattern on its second side forming a Ball Grid Array (BGA) for mounted and interconnected the package to a system substrate (not shown).
- BGA Ball Grid Array
- the printed circuits, interconnect vias and other circuit components not necessary to a proper understanding of the current invention are not shown for clarity.
- the chip 12 is covered with a plastic resin encapsulant 42 to protect the chip 12 and bonding wire connections 14 using the same dam and fill encapsulation method described above for the first embodiment.
- a plastic resin encapsulant 42 to protect the chip 12 and bonding wire connections 14 using the same dam and fill encapsulation method described above for the first embodiment.
- the entire substrate 11 including digital die 40 and the shielding lid 20 is covered in an encapsulating resin 43 .
- the height of the shielding lid 20 and encapsulating resin 43 are controlled so that the top of the shielding lid 20 is not covered in the encapsulating resin 43 .
- a second vent opening 44 is provided in the top 21 of the shielding lid 20 to promote air flow through the shielding space 23 via the two vent openings 30 , 44 . This substantially reduces the likelihood of moisture accumulation inside the shielding lid 20 during the re-heat process for molding or changes in environmental conditions or subsequent thermal excursions during storage or service of the package 10 .
Abstract
An electronic component package having an EMI shielded space is disclosed. The package comprises a substrate having an electronic component located on its surface and a conductive enclosure having a top and downwardly extending sides enclosing the component and defining a shielded space. A vent opening is provided through the substrate and is located in the shielded space for venting the shielded space. A second vent opening may be provided in the top of the conductive enclosure.
Description
- 1. Field of the Invention
- The current invention relates to electronic component packages and to electromagnetic interference (EMI) shielding. More particularly, the invention relates to electronic component packages, such as system-in-package modules, with EMI shielding to isolate a component in the package from electromagnetic interference, or from causing electromagnetic interference, in other parts of the package.
- 2. Background Information
- System-in-package (SiP) technology is an integrated module design that contains one or more IC chips and associated discrete components for performing an entire electronic circuit function incorporated into a single encapsulated package. Electromagnetic interference (EMI), also known as radio frequency interference (RFI), is caused by electromagnetic radiation emitted by electronic circuits and components carrying changing electrical signals. EMI is a major consideration in single package design especially where EMI sensitive and/or RF components are tightly packed together, which is becoming increasingly common place with the proliferation of wireless technologies into a range of small scale electronic devices.
- The most popular form of shielding within SiP modules is through use of a shielding lid to enclose the sensitive or EMI generating component. The component is mounted on an area of a supporting substrate with a ground trace plane beneath it and a metal box, or other shaped, lid is mounted over the component to enclose the component in a conductive enclosure. Metal lids of this type take up considerable space on the substrate surface and tended to be not very robust often dislodging from the substrate surface due to cyclic stress loading on the solder joints holding the lid to the substrate. This problem is ameliorated to some extent by overmolding or encapsulation of the package, including the lid, in resin to protect the package and components from mechanical damage, shock and moisture. However, the lid must have openings in its top and sides to facilitate the flow of the encapsulating resin. The amount and size of these openings is restricted to avoid EMI leakage, particularly for high frequency operations. The flow of encapsulating resin is therefore restricted often resulting in air spaces within the shielding lid. The openings are subsequently blocked by the resin trapping this air within the lid, which is hazardous to package reliability during subsequent thermal excursions and can result in cracking and dislodging of the shielding lid.
- Accordingly, is an object of the present invention to provide an electronic component package having EMI shielding for sensitive electronic or EMI generating components that overcomes or at least ameliorates the above problems.
- In view of the forgoing, there is disclosed herein an electronic component package having EMI shielding, comprising a substrate having a mounting area for an electronic component, an electronic component located on the mounting area, a conductive enclosure having a top and downwardly extending sides enclosing the mounting area and defining a shielded space above the mounting area, and a vent opening extending through the substrate, the opening located in the mounting area for venting the shielded space.
- Preferably, the vent opening extending through the substrate is a plated via.
- Preferably, the component is covered with an encapsulant and the vent opening extending through the substrate is not covered with the encapsulant.
- Preferably, the component package further includes a second vent opening in the top of the conductive enclosure.
- Preferably, the top and sides of the conductive enclosure do not have any further openings.
- Preferably, portions of the substrate and conductive enclosure are covered with an encapsulant and the second vent opening is not covered with the encapsulant. More preferably, the top of the conductive enclosure is not covered with the encapsulant.
- Preferably, the substrate includes a ground trace or other grounding means and the sides of the conductive enclosure make contact with the ground trace or grounding means.
- Preferably, the component is a semiconductor die and in particular a radio frequency (RF) chip.
- Preferably, the conductive enclosure is adapted to attenuate electromagnetic radiation emitted by the component.
- Preferably, the component package is a semiconductor chip package.
- There is also disclosed herein a method of making an electronic component package, comprising steps of (1) providing a substrate having a mounting area for an electronic component and a vent opening extending through the substrate adjacent the mounting area, (2) mounting a component on the mounting area, and (3) locating a conductive enclosure on the substrate to surround the component and the vent opening.
- Preferably various other steps include, but are not limited to, covering the component, or at least an active part of it, with an encapsulant and not covering the vent opening with the encapsulant; and providing a second vent opening in the conductive enclosure and also covering portions of the substrate and conductive enclosure with an encapsulant and not covering the second vent opening with the encapsulant.
- Further aspects of the invention will become apparent from the following description.
- An exemplary form of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:
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FIG. 1 is a section schematic depiction through an electronic component package according to a first embodiment of the invention, and -
FIG. 2 is a section schematic depiction through an electronic component package according to a second embodiment of the invention. - In the described exemplary embodiments of the invention an electronic component package comprises a substrate having an electronic component located its surface and a conductive enclosure having a top and downwardly extending sides enclosing the component and defining a shielded space. A vent opening is provided through the substrate and opens within the shielded space for venting the shielded space. A second vent opening may be provided in the top of the conductive enclosure.
- In the drawings there are depicted two exemplary embodiments of the invention as practiced in a system-in-package (SiP) package having both radio frequency (RF) and digital integrated circuit (IC) chips packaged together on a single substrate. These exemplary examples are not however intended to limit the scope of use or functionality of the present invention. Those skilled in the art will appreciate that aspects of the invention may be practiced in other types of packaged component arrangements where it is desirable to isolated one or more component from noise interference in, or from introducing noise interference into, other parts of the package. Further, the exemplary embodiment is a single package having a single support substrate with a Bally Grid Array (BGA) for interconnection to a system substrate or motherboard. The skilled artisan will appreciate that the invention applies equally to stack chip arrangements such as a stacked multi-chip modules (MCMs). A particular IC chip configuration is also described to illustrate the invention and this is also not intended to limit the scope of use or functionality of the invention. Other chip types, components and/or their combinations may be used with the invention. The invention applies generally to any sensitive electronic or EMI generating component that must be isolated within a multi-component package.
- Referring to
FIG. 1 , in a first exemplary embodiment of the present invention anelectronic component package 10 comprises a supportingsubstrate 11 having a radio frequency (RF)chip 12 mounted in achip mounting area 13 on a first side of the substrate in known manner. The supportingsubstrate 11 is provided with printed circuits on one or more of its surfaces and bonding pads for connecting thechip 12 to the printed circuits usingbonding wires 14. The topactive surface 15 of thechip 12 is covered with aplastic resin encapsulant 42 to protect thechip 12 and bondingwire 14 connections using a known overmolding, glob-top or dam and fill encapsulation method. Thesubstrate 11 has aground trace 17, or other grounding means, surrounding thechip mounting area 13. Thesubstrate 11 has a plurality of balls ofsolder 18 arranged in a grid pattern on its second side forming a Ball Grid Array (BGA) for mounted and interconnected thepackage 10 to a system substrate (not shown). The printed circuits, interconnect vias and other circuit components not necessary to a proper understanding of the current invention are not shown for clarity. - In the exemplary embodiment, the
chip 12 and itsbonding wires 14 are covered with aplastic resin encapsulant 42, without cover the vent opening 30 adjacent theRF chip 12, by using dam and fill encapsulation method. In this method a dam is first formed by running a bead of a high-viscosity encapsulant 41 around theRF chip 12. The dam is then filled with a lower-viscosity filler encapsulant 42 which flows over theRF chip 12 andbonding wires 14, but is restrained by thedam 41. - A
metallic shielding lid 20 having atop 21 and downwardly extendingsides 22 is located over thechip mounting area 13 to enclose theRF chip 12. Thesides 22 of theshielding lid 20 are connected with theground trace 17 of the substrate to ground thelid 20. The lid forms a shieldedspace 23 in which thechip 12 is located for blocking, or at least attenuating, electromagnetic radiation generated by theRF chip 12. In the first exemplary embodiment theshielding lid 20 does not have any openings or apertures in itstop 21 orsides 22 and provides an entirely closed enclosure surrounding the shieldedspace 23. In order to make the package more robust thesubstrate 11 and theshielding lid 20 are covered in anencapsulating resin 19. - A
vent opening 30 is provided through thesubstrate 11 adjacent theRF chip 12 from thechip mounting area 13 within theshielding space 23 to the second side of the substrate. The vent opening 30 permits venting of the otherwise sealedspace 23 to allow any gases and moisture in the space to escape and to balance the external and internal pressure of the shieldedspace 23. To prevent moisture and other environmental contaminants derogating the integrity of thesubstrate 11 by entering the substrate layers thevent opening 30 is plated on its inside surface. Such aventing opening 30 is typically, but not essentially, formed as a plated through-hole (e.g. a via) during substrate manufacturer. -
FIG. 2 shows a second exemplary embodiment of the present invention. In the drawings like elements have the same reference numbers. InFIG. 2 theelectronic component package 10 comprises a supportingsubstrate 11 having a radio frequency (RF)chip 12 mounted in a shieldedcomponent mounting area 13 on its first side in known manner. A second semiconductor chip, such asdigital IC 40, is also located on the first side of the substrate. The supportingsubstrate 11 is provided with printed circuits on one or more of its surfaces and bonding pads for connecting thechips bonding wires 14. Thesubstrate 11 has aground trace 17, or other grounding means, surrounding the shieldedcomponent mounting area 13. Thesubstrate 11 has a plurality of balls ofsolder 18 arranged in a grid pattern on its second side forming a Ball Grid Array (BGA) for mounted and interconnected the package to a system substrate (not shown). The printed circuits, interconnect vias and other circuit components not necessary to a proper understanding of the current invention are not shown for clarity. - A shielding
lid 20 having a top 21 and downwardly extendingsides 22 is located over the shieldedcomponent mounting area 13 to enclose theRF chip 12. Thesides 22 of the shieldinglid 20 are connected with theground trace 17 of the substrate to ground thelid 20. The lid forms a shieldedspace 23 in which thechip 12 is located for blocking, or at least attenuating, electromagnetic radiation generated by theRF chip 12. Avent opening 30 is also provided through thesubstrate 11 adjacent theRF chip 12 from the shieldedcomponent mounting area 13 within the shieldingspace 23 to the second side of the substrate. - The
chip 12 is covered with aplastic resin encapsulant 42 to protect thechip 12 andbonding wire connections 14 using the same dam and fill encapsulation method described above for the first embodiment. To make the package more robust theentire substrate 11 includingdigital die 40 and the shieldinglid 20 is covered in an encapsulatingresin 43. The height of the shieldinglid 20 and encapsulatingresin 43 are controlled so that the top of the shieldinglid 20 is not covered in the encapsulatingresin 43. A second vent opening 44 is provided in the top 21 of the shieldinglid 20 to promote air flow through the shieldingspace 23 via the twovent openings lid 20 during the re-heat process for molding or changes in environmental conditions or subsequent thermal excursions during storage or service of thepackage 10. - To make the electronic component packages depicted and described a
substrate 11 is first prepared having printed circuits including a mountingarea 13 for an electronic component to be shielded and a plated through-hole extending through the substrate adjacent the mountingarea 13. The plated through-hole forms thevent opening 30. Thesubstrate 11 can be prepared using known PCB manufacturing techniques. The electronic component, in the exemplary embodiments anRF chip 12, is then mounted to the substrate andbonding wires 14 connected to the printed circuits. If needed, the component is covered with an encapsulant using an overmolding, a glob-top or a dam and fill procedure to protect it from mechanical damage, shock and moisture. Care must be taken not to cover the plated through-hole adjacent the mountingarea 13. - After encapsulation of the component the shielding
lid 20 is located on the substrate to surround the component and the plated through-hole. The sides of the lid are connected to the ground traces 17 to ground thelid 20. The top of the substrate and lid are then covered by the further encapsulant. - For making the package of the second embodiment the shielding lid is provided with a second vent hole in its top 21 prior being located on the substrate. When covering the top of the substrate the height of the mould for the encapsulating
resin 43 is controlled so that the top of the shieldinglid 20 is not covered in the encapsulatingresin 43. - For high frequency applications the size of the
vent openings - The shielding
lid 20 may be made of any suitable material for blocking, or at least attenuating, electromagnetic radiation emitting from electronic components carrying changing electrical signals. For shielding lower frequency components; such as shielding transforms, inductors and coils; high permeability materials such as tin plated steel may be used. For shielding high frequency components; such as RF chips, microprocessors and fast operating switches; non-ferrous materials such as tin plated copper, phosphor bronze or beryllium copper may be used. - It should be appreciated that modifications and/or alternations obvious to those skilled in the art are not to be considered as beyond the scope of the present invention. For example, in the second exemplary embodiment a second vent opening is provided in the top 21 of the shielding
lid 20. Venting of the shieldedspace 23 is effective via thevent opening 30 extending through thesubstrate 11 so that no openings in the shieldinglid 20 are possible. However, one or more vent openings in the top of the shieldinglid 20 are within the scope of the invention although preferably, to maintain the shielding effectiveness of thelid 20, fewer openings are desirable. Also, preferably there are no openings, slots, slits or other apertures in the sides of thelid 20. - In the exemplary embodiments a RF chip component is used and it is preferably to protect the chip from mechanical damage, shock and moisture by covering it in an
encapsulant 42. However, the skilled addressee will appreciate that other components; e.g. transforms, inductors, coils and fast operating switches; may be shielded in a package according to the invention that do not require covering in anencapsulant 42.
Claims (21)
1. An electronic component package having an EMI shielded component, comprising:
a substrate having a mounting area for an electronic component,
an electronic component located on the mounting area,
a conductive enclosure having a top and downwardly extending sides enclosing the mounting area and defining a shielded space above the mounting area, and
a vent opening extending through the substrate, the opening located in the mounting area for venting the shielded space.
2. The component package of claim 1 wherein the vent opening extending through the substrate is a plated via.
3. The component package of claim 1 wherein the component is covered with an encapsulant and the vent opening extending through the substrate is not covered with the encapsulant.
4. The component package of claim 1 further including a second vent opening in the top of the conductive enclosure.
5. The component package of claim 4 wherein the top and sides of the conductive enclosure do not have any further openings.
6. The component package of claim 4 wherein portions of the substrate and conductive enclosure are covered with an encapsulant and the second vent opening is not covered with the encapsulant.
7. The component package of claim 6 wherein the top of the conductive enclosure is not covered with the encapsulant.
8. The component package of claim 1 wherein the substrate includes a ground trace, or other grounding means, and the sides of the conductive enclosure make contact with the ground trace or plane.
9. The component package of claim 1 wherein the component is a semiconductor die.
10. The component package of claim 9 wherein the semiconductor die is a radio frequency (RF) chip.
11. The component package of claim 1 wherein the conductive enclosure is adapted to attenuate electromagnetic radiation emitted by the component.
12. The component package of claim 1 which is a semiconductor chip package.
13. A method of making an electronic component package, comprising steps of:
providing a substrate having a mounting area for an electronic component and a vent opening extending through the substrate adjacent the mounting area,
mounting a component on the mounting area of the substrate, and
locating a conductive enclosure on the substrate to surround the component and the vent opening.
14. The method of claim 13 wherein before performing the step of locating a conductive enclosure on the substrate performing a further step of covering the component with an encapsulant and not covering the vent opening with the encapsulant.
15. The method of claim 13 wherein locating a conductive enclosure on the substrate includes providing a conductive enclosure having a top and downwardly extending sides and a second vent opening in the top.
16. The method of claim 15 including a further step of covering portions of the substrate and the conductive enclosure with an encapsulant and not covering the second vent opening with the encapsulant.
17. The method of claim 13 wherein mounting a component on the mounting area includes mounting a semiconductor die on the mounting area, the die having an active surface, and covering at least the active surface of the die with an encapsulant.
18. The method of claim 17 wherein covering the active surface of the die with an encapsulant includes one of an overmolding procedure, a glob-top procedure or a dam and fill procedure.
19. The method of claim 13 wherein providing a substrate having a mounting area for an electronic component and a vent opening includes during a step of preparing the substrate drilling a hole having a hole wall extending through the substrate and plating the hole wall.
20. A semiconductor chip package comprising:
a substrate having a surface provided with an electronic circuit,
a semiconductor die mounted on the surface and connected with the electronic circuit,
a shielding enclosure located over the semiconductor die and defining a shielded space surrounding the semiconductor die,
a vent opening extending through the substrate, the opening located within the shielded space for venting the shielded space.
21. The semiconductor chip package of claim 20 further including a second vent opening in the conductive enclosure, and wherein the surface of the substrate is covered with an encapsulant that surrounds the shielding enclosure but does not cover the second vent opening.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US11/522,016 US20080067650A1 (en) | 2006-09-15 | 2006-09-15 | Electronic component package with EMI shielding |
CN2007800004867A CN101322245B (en) | 2006-09-15 | 2007-07-03 | Electronic component package with EMI shielding |
PCT/CN2007/070222 WO2008034356A1 (en) | 2006-09-15 | 2007-07-03 | Electronic component package with emi shielding and method of making the same |
US12/538,296 US8241966B2 (en) | 2006-09-15 | 2009-08-10 | Methods of making an electronic component package and semiconductor chip packages |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/522,016 US20080067650A1 (en) | 2006-09-15 | 2006-09-15 | Electronic component package with EMI shielding |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/538,296 Division US8241966B2 (en) | 2006-09-15 | 2009-08-10 | Methods of making an electronic component package and semiconductor chip packages |
Publications (1)
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US20080067650A1 true US20080067650A1 (en) | 2008-03-20 |
Family
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US11/522,016 Abandoned US20080067650A1 (en) | 2006-09-15 | 2006-09-15 | Electronic component package with EMI shielding |
US12/538,296 Active 2027-05-05 US8241966B2 (en) | 2006-09-15 | 2009-08-10 | Methods of making an electronic component package and semiconductor chip packages |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US12/538,296 Active 2027-05-05 US8241966B2 (en) | 2006-09-15 | 2009-08-10 | Methods of making an electronic component package and semiconductor chip packages |
Country Status (3)
Country | Link |
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US (2) | US20080067650A1 (en) |
CN (1) | CN101322245B (en) |
WO (1) | WO2008034356A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
CN101322245B (en) | 2011-04-13 |
US20090294931A1 (en) | 2009-12-03 |
WO2008034356A1 (en) | 2008-03-27 |
CN101322245A (en) | 2008-12-10 |
US8241966B2 (en) | 2012-08-14 |
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