about solder in pentium 4

I have 2 questions here. What kind of material is the current solder in Pentium 4 made of? Can we replace the solder by Sn-5Sb? why?
Thank you very much !!
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Jack:
Learn to use google. If you look in Chapters 9 and 15 of the Intel Packaging Databook at: http://www.intel.com/design/packtech/packbook.htm then you will find some useful information in Chapters 9 and 15. Solder balls generally are eutectic lead tin.
Now look up the eutectic temperature for it and for the Sn-5Sb eutectic, and consider whether the rest of the materials in the package can handle the higher temperature...
http://www.boulder.nist.gov/div853/lead%20free/solders.html
Pittsburgh Pete
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