Genny, I had the same question. We use PB-Free components all the time in 
our PB-Sn process. I have noticed that some components do not appear to 
wet as easily as other, which may be attributable to the finish, but never had 
hte time to study it. I probably should, considering it may affect reliability, but 
there are always other fish to fry.

Any Technetters have any issues documented with PB-Free components in a 
Pb-Sn process, other than BGAs?

Blair

On Wed, 5 May 2010 09:07:16 -0600, Genny Gibbard 
<[log in to unmask]> wrote:

>Since you are still allowed to use leaded solder obviously, why not continue 
to use leaded solder, but allow the use of leadfree components?  
>You aren't stressing the board with leadfree soldering temps, but the 
leadfree components are much easier to source. 
>The only components that are not usually considered backwards compatible 
are BGA's.  If you use BGA's, then this gets a lot more complicated.
>
>
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of ALLEN, LOA
>Sent: May 5, 2010 8:17 AM
>To: [log in to unmask]
>Subject: Re: [TN] Why not Pb-free?
>
>Bev,
>
>Now that I've had some time to think about it . . . it doesn't seem so clear 
cut this morning.
>
>My intent was to demonstrate to management the affects of the higher 
temps required for Pb-free soldering processes.  I was looking for a baseline, 
not a qualification.
>
>Some management are claiming we are spending too much time & money 
ordering & waiting for the Sn/Pb versions of the components - and in some 
cases reworking to Sn/Pb solder termination finishes.  I wanted to 
demonstrate that we were going to spend time & money on PWB redesign & 
confirming our existing parts database would withstand the elevated time & 
temperatures.  Either way it is going to cost us so why not stay with the 
proven methods & materials.
>
>The 20x was the number of samples I hoped to start with, 2ea solder float 
5x, 2ea solder float 7x, 2ea 9x, 2ea 11x, & 2ea 13x, then repeat for the 
elevated temp.
>
>I really appreciate all the comments & ideas, Loa
>

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