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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