WO1997025847A1 - Shielding of electronic components embedded in plastics directly on circuit board - Google Patents

Shielding of electronic components embedded in plastics directly on circuit board Download PDF

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Publication number
WO1997025847A1
WO1997025847A1 PCT/SE1997/000015 SE9700015W WO9725847A1 WO 1997025847 A1 WO1997025847 A1 WO 1997025847A1 SE 9700015 W SE9700015 W SE 9700015W WO 9725847 A1 WO9725847 A1 WO 9725847A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit board
printed circuit
electronic components
shielding
insulating polymer
Prior art date
Application number
PCT/SE1997/000015
Other languages
French (fr)
Inventor
Bo Wikström
Original Assignee
Xicon Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Xicon Ab filed Critical Xicon Ab
Priority to AU13251/97A priority Critical patent/AU1325197A/en
Publication of WO1997025847A1 publication Critical patent/WO1997025847A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/58—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries
    • H01L23/585—Structural electrical arrangements for semiconductor devices not otherwise provided for, e.g. in combination with batteries comprising conductive layers or plates or strips or rods or rings
    • 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
    • H01L23/3135—Double encapsulation or coating and encapsulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/552—Protection against radiation, e.g. light or electromagnetic waves
    • 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
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening
    • H05K9/0039—Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing
    • 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
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • 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
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • 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
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • 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
    • 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
    • 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
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors
    • 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
    • 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
    • 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
    • H01L2924/01—Chemical elements
    • H01L2924/01063—Europium [Eu]
    • 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
    • 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
    • H01L2924/30—Technical effects
    • H01L2924/301—Electrical effects
    • H01L2924/3025—Electromagnetic shielding
    • 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
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0213—Electrical arrangements not otherwise provided for
    • H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
    • H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
    • 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
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/28—Applying non-metallic protective coatings
    • H05K3/284—Applying non-metallic protective coatings for encapsulating mounted components

Definitions

  • a meaning with the current invention is to considerably simplify and reduce cost for shielding of components on the lowest possible system level.
  • This seal is equipped with a thin layer of a conductive polymer, e.g. silver epoxy which is connected to a ground terminal on the printed circuit board.
  • a conductive polymer e.g. silver epoxy which is connected to a ground terminal on the printed circuit board.
  • Other types of polymer seals which is done partially can also be used e.g. on assembly of direct bumped chips i.e. flip-chip. Eventually a thin insulating varnish needs to be applied, before the conductive polymer layer is applied.
  • FIG. 1 shows a chip direct bonded on the printed circuit board and then sealed with an insulating polymer.
  • Fig.2 shows a so called flip-chip mounted chip. This has then been covered partially with an insulating polymer and conductive polymer on top of the assembly.
  • Fig 3 shows a direct mounted passive component which globtop has been equipped with a conductive polymer to give the shielding for the component.
  • Fig.l shows a direct bonded chip 3, on a printed circuit board 1, which has been equipped with an insulating polymer 2, of e.g. epoxy, to give the chip 3 that environmental protection it needs.
  • an insulating polymer 2 of e.g. epoxy
  • a conductive polymer 4 which is connected to a ground terminal 7 on the printed circuit board 1
  • the conductive polymer 4 can be a metal filled epoxy polymer.
  • Fig 2 shows a bumped chip 3 mounted as a so called flip-chip. This type of assembly is then covered on the underside and the edges with an insulating polymer 2, i.e. underfiller.
  • the top side of the chip 3 is equipped with an insulating varnish, if the chip design so requires, before the conductive polymer 4 is applied and connected to a ground terminal 7 on the printed circuit board.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Toxicology (AREA)
  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)

Abstract

Method of electrically shielding electronic components that are mounted directly on a printed circuit board and completely or partly provided with an insulating polymer. The insulating polymer is provided with a thin layer of conducting material.

Description

SHIELDING OF ELECTRONIC COMPONENTS EMBEDDED IN PLASTICS DIRECTLY ON CIRCUIT BOARD
Field of invention Electrical shielding of electronic components, which are mounted directly on a printed circuit board, or substrate as it also is called, to avoid electrical noise radiated in or out i.e. EMC.
Prior Art
Electrical shielding of electronic components, which are mounted directly on a printed circuit board, are done with different types of shield boxes which are mounted on the printed circuit board or covers the electronic unit to reduce the electrical noise radiated in or out. Sometimes non conductive plastic boxes, which are metallized on the inside or outside, to give the electrical shielding effect. The components have not been equipped with a shield barrier, because this causes a short circuit between the component pins. This sector, to shield electronic designs, have been more and more focused due to the increased demands, caused by the new demands of EU, on electronic products.
Short summary of invention
A meaning with the current invention is to considerably simplify and reduce cost for shielding of components on the lowest possible system level. This means that local shielding of components which are equipped with an insulating polymer, directly on the printed circuit board, i.e. globtop or blobtop. This seal is equipped with a thin layer of a conductive polymer, e.g. silver epoxy which is connected to a ground terminal on the printed circuit board. Other types of polymer seals which is done partially can also be used e.g. on assembly of direct bumped chips i.e. flip-chip. Eventually a thin insulating varnish needs to be applied, before the conductive polymer layer is applied.
Short description of drawings The invention, here described below, with drawings showing different types of components, which first are covered fully or partially direct on the printed circuit board, with a polymer which then is covered with a thin conductive polymer. Fig. 1 shows a chip direct bonded on the printed circuit board and then sealed with an insulating polymer. Fig.2 shows a so called flip-chip mounted chip. This has then been covered partially with an insulating polymer and conductive polymer on top of the assembly. Fig 3 shows a direct mounted passive component which globtop has been equipped with a conductive polymer to give the shielding for the component.
Detailed description
Fig.l shows a direct bonded chip 3, on a printed circuit board 1, which has been equipped with an insulating polymer 2, of e.g. epoxy, to give the chip 3 that environmental protection it needs. After that a conductive polymer 4, which is connected to a ground terminal 7 on the printed circuit board 1, has been applied on top of the insulating polymer 2 to give a shielding against electrical noise. The conductive polymer 4 can be a metal filled epoxy polymer. Fig 2 shows a bumped chip 3 mounted as a so called flip-chip. This type of assembly is then covered on the underside and the edges with an insulating polymer 2, i.e. underfiller. Eventually the top side of the chip 3 is equipped with an insulating varnish, if the chip design so requires, before the conductive polymer 4 is applied and connected to a ground terminal 7 on the printed circuit board.

Claims

1. Method for electrical shielding of electronic components which are directly mounted on a printed circuit board and here fully or partially been equipped with an insulating polymer c h a r a c t e r i s e d in that the insulating polymer which fully or partially covers the electronic component, is equipped with a thin layer of a conductive material which shields the electronic component from airborne electrical noise.
2. Method for electrical shielding of electronic components which are direct mounted on the printed circuit board and here fully or partially been equipped with an insulating polymer, according to claim 1 c h a r a c t e r i s e d in that direct bonded semiconductor chips which have been equipped with a so called globtop are covered with a conductive polymer which shields the assembly from electrical noise.
3. Method for electrical shielding of electronic components which are direct mounted on the printed circuit board and here fully or partially been equipped with an insulating polymer, according to claim 1 c h a r a c t e r i s e d in that flip-chip mounted semiconductor chips, which equipped with a partial or full sealing of an insulating polymer, are covered with a conductive polymer which shields the assembly from electrical noise.
4. Method for electrical shielding of electronic components which are direct mounted on the printed circuit board and here fully or partially been equipped with an insulating polymer, referring to claim 1 c h a r a c t e r i s e d in that passive components, which are direct mounted on the printed circuit board and equipped with a so called globtop, are covered with a conductive polymer which shields the assembly from electrical noise.
PCT/SE1997/000015 1996-01-08 1997-01-08 Shielding of electronic components embedded in plastics directly on circuit board WO1997025847A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU13251/97A AU1325197A (en) 1996-01-08 1997-01-08 Shielding of electronic components embedded in plastics directly on circuit board

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9600085A SE9600085D0 (en) 1996-01-08 1996-01-08 Shielding of electronic components that are baked directly on PCBs
SE9600085-6 1996-01-08

Publications (1)

Publication Number Publication Date
WO1997025847A1 true WO1997025847A1 (en) 1997-07-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000015 WO1997025847A1 (en) 1996-01-08 1997-01-08 Shielding of electronic components embedded in plastics directly on circuit board

Country Status (3)

Country Link
AU (1) AU1325197A (en)
SE (1) SE9600085D0 (en)
WO (1) WO1997025847A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013233A1 (en) * 1998-08-28 2000-03-09 Amkor Technology, Inc. Electromagnetic interference shield device and method
EP1120831A2 (en) * 2000-01-24 2001-08-01 Infineon Technologies AG Electronic component with an electromagnetic shielding device
EP1160859A2 (en) * 2000-05-30 2001-12-05 Alps Electric Co., Ltd. Surface-mounting type electronic circuit unit suitable for miniaturization and easy to manufacture
US6448635B1 (en) 1999-08-30 2002-09-10 Amkor Technology, Inc. Surface acoustical wave flip chip
WO2003026006A2 (en) * 2001-08-30 2003-03-27 Infineon Technologies Ag Arrangement of a semiconductor in a housing, chip card and chip module
EP2043149A1 (en) * 2007-09-27 2009-04-01 Oticon A/S Assembly comprising an electromagnetically screened smd component, method of manufacturing the same and use

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4959752A (en) * 1988-10-24 1990-09-25 Digital Equipment Corporation Electronic module RFI/EMI shielding
US5177324A (en) * 1991-08-19 1993-01-05 Motorola, Inc. In situ RF shield for printed circuit board
DE4016953C2 (en) * 1990-05-25 1993-05-13 Deutsche Itt Industries Gmbh, 7800 Freiburg, De
US5287247A (en) * 1990-09-21 1994-02-15 Lsi Logic Corporation Computer system module assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4959752A (en) * 1988-10-24 1990-09-25 Digital Equipment Corporation Electronic module RFI/EMI shielding
DE4016953C2 (en) * 1990-05-25 1993-05-13 Deutsche Itt Industries Gmbh, 7800 Freiburg, De
US5287247A (en) * 1990-09-21 1994-02-15 Lsi Logic Corporation Computer system module assembly
US5177324A (en) * 1991-08-19 1993-01-05 Motorola, Inc. In situ RF shield for printed circuit board

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000013233A1 (en) * 1998-08-28 2000-03-09 Amkor Technology, Inc. Electromagnetic interference shield device and method
US6092281A (en) * 1998-08-28 2000-07-25 Amkor Technology, Inc. Electromagnetic interference shield driver and method
US6472598B1 (en) 1998-08-28 2002-10-29 Amkor Technology, Inc. Electromagnetic interference shield device with conductive encapsulant and dam
US6601293B1 (en) 1998-08-28 2003-08-05 Amkor Technology, Inc. Method of making an electromagnetic interference shield device
US6448635B1 (en) 1999-08-30 2002-09-10 Amkor Technology, Inc. Surface acoustical wave flip chip
EP1120831A2 (en) * 2000-01-24 2001-08-01 Infineon Technologies AG Electronic component with an electromagnetic shielding device
EP1120831A3 (en) * 2000-01-24 2003-12-17 Infineon Technologies AG Electronic component with an electromagnetic shielding device
EP1160859A2 (en) * 2000-05-30 2001-12-05 Alps Electric Co., Ltd. Surface-mounting type electronic circuit unit suitable for miniaturization and easy to manufacture
EP1160859A3 (en) * 2000-05-30 2005-03-30 Alps Electric Co., Ltd. Surface-mounting type electronic circuit unit suitable for miniaturization and easy to manufacture
WO2003026006A2 (en) * 2001-08-30 2003-03-27 Infineon Technologies Ag Arrangement of a semiconductor in a housing, chip card and chip module
WO2003026006A3 (en) * 2001-08-30 2003-08-07 Infineon Technologies Ag Arrangement of a semiconductor in a housing, chip card and chip module
EP2043149A1 (en) * 2007-09-27 2009-04-01 Oticon A/S Assembly comprising an electromagnetically screened smd component, method of manufacturing the same and use

Also Published As

Publication number Publication date
AU1325197A (en) 1997-08-01
SE9600085D0 (en) 1996-01-08

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