Learn to use google.
If you look in Chapters 9 and 15 of the Intel Packaging Databook at:
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...
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