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May 2002

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Subject:
From:
Guy Ramsey <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 9 May 2002 11:20:25 -0400
Content-Type:
text/plain
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text/plain (141 lines)
I did a little search on the web and found that TI claims eight years when
stored in their packaging . . . three years outside of it . . . HA!

> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]]On Behalf Of Earl Moon
> Sent: Thursday, May 09, 2002 9:07 AM
> To: [log in to unmask]
> Subject: Re: [TN] Palladium Leads
>
>
> Bev and others,
>
> I've worked with Pd in one way or another, starting with hybrids in the
> '60's but never thought about solderability over time. What is the "shelf"
> life of Pd compared, say, with SnPb? Know the question is too general but
> any guesses?
>
> Earl
> ----- Original Message -----
> From: "Bev Christian" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Thursday, May 09, 2002 7:59 AM
> Subject: Re: [TN] Palladium Leads
>
>
> > Henry,
> > Back in the mid 90's when these parts (TI palladium plated) were
> introduced
> > in the company I worked at then, we had some teething problems.
>  But with
> > some profile manipulation and training of operators we did not have any
> > issues (Of course there was lab testing in the background).
> The training
> > had to be done because there will be more wetting angles closer to 90
> > degrees than they are used to.
> >
> > One other very important thing, this finish and I suppose other
> palladium
> > finishes, is/are finicky when it comes to fluxes.  Some no-cleans work,
> > others don't.  We were lucky our old standard fluxes - Kester
> R243 solder
> > paste and 923 and 924FB wave solder fluxes worked well.  Others didn't.
> >
> > And finally, how old are your parts and what conditions have they been
> > stored in?  I'm sure others will come up with other good questions and
> > hopefully a few hints for you.
> >
> > regards,
> > Bev Christian
> > Research in Motion
> >
> > -----Original Message-----
> > From: Henry Rekers [mailto:[log in to unmask]]
> > Sent: May 8, 2002 8:33 PM
> > To: [log in to unmask]
> > Subject: [TN] Palladium Leads
> >
> >
> > Has anybody out there experienced non-wetting problems with no-clean
> > solderpastes on parts that have palladium coatings on the leads.
> > Specifically, have you had this problem with Texas Instruments parts?
> >
> > Thanks.
> >
> > Henry J. Rekers
> > Manufacturing Engineer
> >
> >
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