1 / 10

Enhanced X-Ray Shielding Device Package

Enhanced X-Ray Shielding Device Package. Raymond Kuang Randy Sampan . September 7 - 9, 2005. Limitation of Conventional CQFP Packages. Current X-ray shielding package limitation:

orestes
Download Presentation

Enhanced X-Ray Shielding Device Package

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Enhanced X-Ray Shielding Device Package Raymond Kuang Randy Sampan September 7 - 9, 2005

  2. 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

  3. 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

  4. CuW lid CuW lid CuW tab – intended to block radiation coming from this direction, CuW tap is higher than bond finger tier CuW tab – intended to block radiation coming from this direction, CuW tap is higher than bond finger tier die die Ceramic body Ceramic body CuW for X-ray shielding CuW for X-ray shielding 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 • Better Thermal performance. The CuW at the bottom provides better heat dissipation.

  5. Enhanced Radiation Shield Package • Features… con’t CuW tab A delidded unit showing the CuW tab between die and package’ lead finger.

  6. Enhanced Radiation Shield Package Picture of current CQ84 X-Ray enhanced package

  7. CuW tab – intended to block radiation coming from this direction, CuW tap is higher than the second tier of bond finger die Ceramic body CuW for X-ray shielding 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 CuW Lid

  8. 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

  9. Reliability • Reliability is comparable with the regular CQFP packages. • The X-ray shielding packages are heavier • Assembly of the parts to end users’ system boards need special attention in order to prevent leads breaking during vibration testing

  10. 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!

More Related