Re: Lifetime of Al bond pad

"Volker Nitsche" <[EMAIL PROTECTED]> schrieb im Newsbeitrag
news:[EMAIL PROTECTED]
> Hello,
>
> does anybody know the lifetime of a typical Al bond pad on a typical IC?
We
> urgently need some ICs and I can get some which have been stored (in a box
> at normal ambient conditons) for more than a year (1.5 up to 2 years).
>
> Is there any risk, that these Al pads have been deteriorated over the
> years? Like becoming hard and we will be faced with cratering and other
> nasty things at wire bonding.
>
> Regards
> Volker


Hi!

Maybe oxidation is the main problem if the samples were lying aroun for
several years.
What about trying to bond one of these?
If it don't work, maybe a short dip in thinned phosphoric acid may help.
I have never tried it, so be careful.

Regards
Alex