From:  Stephen Ayotte
       EM Quality Engineering
       Bldg. 14-3 Col F5 5-1537
Subject:

I have a question similar to the ionics question asked last week.

Does anybody know the impact that gold hardness and impurity has
on wirebondability?

For a gold wire wedge bonder application the specification requires
gold with a Knoop hardness of 90 or less and a purity of 99.9 or
higher.  What if the hardness is greater than 90?  How high has anyone
done testing; 100, 200, 300?  Same for purity, how low a purity has
anyone done testing or had practical experience with; 99.5, 99.0, 98.0?

Thanks.

**** IBM MD Product Quality Engineer       ****
****       OEM Quality Engineer            ****
**** Interenterprise Address: USIB6CEF     ****
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