Enhanced X-Ray Shielding Device Package Raymond Kuang Randy Sampan September 7 - 9, 2005
Jan 05, 2016
Enhanced X-Ray Shielding Device Package
Raymond Kuang
Randy Sampan
September 7 - 9, 2005
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Limitation of Conventional CQFP Packages
Current X-ray shielding package limitation:Most of the X-Ray enhanced packages, particularly the
Ceramic Quad Flat Pack(CQFP) packages only provide top and bottom X-ray shielding
Actel's solution:Special CQFP package construction to provide 360
deg. X-ray protection. Use the existing methods of substrate manufacturing and
assembly technologies
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Enhanced X-Ray Radiation Shielding Package from Actel
Advantages: Designed for use on environment where intense
radiation is a concern the heavy metal on top, bottom, and internal tab of the
package provides 360° radiation shielding
It is easy to implement for CQFP packages with existing assembly technology
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Enhanced Radiation Shield Package
Features for single tier internal bonding Shields the device from radiation from any direction
An internal tab protects the die from horizontal direction The top lid and die paddle blocks radiation from top and
bottom directions
die
CuW for X-ray shielding
CuW lid
Ceramic body
CuW tab – intended to block radiation comingfrom this direction, CuW tapis higher than bond finger tier
Better Thermal performance. The CuW at the bottom provides better heat dissipation.
die
CuW for X-ray shielding
CuW lid
Ceramic body
CuW tab – intended to block radiation comingfrom this direction, CuW tapis higher than bond finger tier
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Features… con’t
CuW tab
A delidded unit showing the CuW tab between die and package’ lead finger.
Enhanced Radiation Shield Package
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Picture of current CQ84 X-Ray enhanced package
Enhanced Radiation Shield Package
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Enhanced Radiation Shield Package
Features for two-tier internal bonding Shields the device from radiation from any direction
An internal tab protects the die from horizontal direction
The top lid and die paddle block radiation from top and bottom directions
Allow more I/Os routing out to package
die
Ceramic bodyCuW for X-ray shielding
CuW tab – intended to block radiation comingfrom this direction, CuW tapis higher than the second tierof bond finger
CuW Lid
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Manufacturing Concerns and solution
Major concern is package’s lead fingers and seal ring are of the same plane. If lid is dropped incorrectly, it can damage the wires This is addressed by using a lid aligner tool to ensure an
lid placement accuracy
The rest of the assembly and test handling are very similar with conventional CQFP package
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Reliability
Reliability is comparable with the regular CQFP packages.
The X-ray shielding packages are heavierAssembly of the parts to end users’ system boards need
special attention in order to prevent leads breaking during vibration testing
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Summary
The Actel’s enhanced X-ray Shielding package is an alternative solution for application that requires extreme protection from X- ray radiation.
Currently CQ84 is available, but bigger CQ could be tooled up.
There are no reliability issues from manufacturing of substrate and assembly standpoint
Packages are heavier, therefore, special attention for mounting to the system to pass vibration requirement is needed.
Thanks!