Hi, sorry to get in between. You seem to discuss what is hot also here
at our company to and from. My first question would be: please,
gentlemen, what are you from Chuck and pupil? I have got some good
advice from Dave at Rockwell,  maybe we have something good to learn
from you too. I have tried for one year to buy an american plasma
cleaner, but when the economists ask  "what is the payback time" , then
what can I answer? Oh, my adrenaline...! /Regards

                                       Ingemar Hernefjord
                                    Ericsson Microwave Systems




> >Date: Tue, 20 Apr 1999 19:09:41 -0400
> >To: <a href="/scripts/wa.exe?LOGON=A3%3Dind9904%26L%3DTECHNET%26E%3D7bit%26P%3D1204585%26B%3D--%26T%3Dtext%252Fplain%3B%2520charset%3DUS-ASCII%3B%2520name%3D%2522Re%3A%2522%26N%3DRe%3A" target="_parent" >[log in to unmask]</a>
> >From: joyce <<a href="/scripts/wa.exe?LOGON=A3%3Dind9904%26L%3DTECHNET%26E%3D7bit%26P%3D1204585%26B%3D--%26T%3Dtext%252Fplain%3B%2520charset%3DUS-ASCII%3B%2520name%3D%2522Re%3A%2522%26N%3DRe%3A" target="_parent" >[log in to unmask]</a>>
> >Subject: Re: [TN] Wire Bonding On Gold
> >
> >(1) If you have good plating, you don't need any physical abrasion.
> >(2) you can use eraser if the surface of Au is not clean, but make
sure it
> has no/low ionics (such as Sulphur- common additive for rubber).
> >(3) you can use brush
> >(4) depend on your process and product, you may be able to use plasma
> too...However, if your plating surface required eraser to remove the
top
> surface, the plasma normally would not do the trick.. Plasma is great
to
> remove MINOR oragnic residue.
> >(5) if your gold is too hard (impurity or voids concentration are
high),
> you will have problem to bond and have reliability problem.  (eraser,
brush,
> plasma are not going to help you).
> >good luck.
> >jk
> >At 06:29 AM 4/20/99 EDT, you wrote:
> >>We are presently wire bonding aluminum wire to gold lands on circuit
boards.
> >>I have heard many times that wire bonding goes sour to clean them
with an
> >>eraser.  This seems a little primitive.  Is there any other way that
this can
> >>be accomplished.
> >>If the eraser works why hasn't someone designed something to take
care of
> >>this.
> >>Chuck Garth
> >>
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