Thanks so much for the info. I'll be looking forward to the
presentations.
Wish I could do more on my own, but we're a small group and having to
follow more industry trends than forge ahead on our own. Looks like
most of the US industries are looking at matte-tin for leads IF they can
control any potential whisker growth. We feel that this would be best
for having a single product line that would handle traditional SnPb
processes as well as some of the lead-free alloys. If our components
can be re-qualified to the higher temperature (260°C) profile and still
meet the MSL requirements, I believe we'd be doing well. Some planned
verification testing should prove this out for us shortly.
Best wishes. I look forward to seeing the results of your work.
Rick Baldridge
W-J Communications, Inc.
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Tuesday, February 05, 2002 5:35 PM
To: [log in to unmask]
Subject: Re: [LF] SnPb-plated Components with Lead-Free solders
Hi Rick! The PbFree Component Finish Focus group presented the results
of a
12 month effort looking at PbFree component finishes. Reliability
testing
was completed (-55C to +125C) incorporating three possible combinations:
leadfree pwb/leadfree solder paste/leadfree component finish, tin/lead
pwb
- tin/lead solder paste-tin/lead component finish and finally a mixture
of
tin/lead and lead free combinations. We did not see any component finish
issues or solder joint reliability issues. The presentations can be
found
in the IPC 2001 Fall meeting proceedings. Good Luck.
Dave Hillman
Rockwell Collins
[log in to unmask]
"Baldridge, Rick" <[log in to unmask]>@ipc.org> on 01/21/2002
05:27:12
PM
Please respond to "(Leadfree Electronics Assembly Forum)"
<[log in to unmask]>
Sent by: Leadfree <[log in to unmask]>
To: [log in to unmask]
cc:
Subject: [LF] SnPb-plated Components with Lead-Free solders
Does anyone have any experience with the backwards compatability and
mechanical issues of SnPb plated components (SOT-89) being used with
lead-free solder paste?
Specifically, we have SnPb-coated leads on SOT-89 packages that we want
to put down on boards with Sn95.5/Ag4.0/Cu0.5 lead-free solder paste.
Assuming for the moment that the components can handle the increased
reflow profile (to 260 degrees MAX), what might the reliability and
metallurgical issues be with mixing a SnPb solder with a Lead-free
solder as mentioned? (I understand that SnPb with any form of Lead-free
containing Bi is a bad idea.)
I'm sure this issue will come up often as component users try to time
the phasing out of there SnPb coated parts. Any help or references
would be greatly appreciated.
Rick Baldridge
Senior Process Engineer
W-J Communications, Inc.
401 River Oaks Parkway
San Jose, CA 95134
Phone (408) 577-6214
FAX (408) 577-6633
Pager (650) 649-4162
E-mail [log in to unmask]
-----Original Message-----
From: Alan Rae [mailto:[log in to unmask]]
Sent: Friday, January 18, 2002 3:23 AM
To: [log in to unmask]
Subject: Re: [LF] Whisker
We used a Sn-Cu HASL as one of the finishes in our CPS lead-free study
and
it performed well.
Alan Rae
VP Technology, Cookson Electronics
Cookson Performance Solutions
25 Forbes Boulevard Suite 3
Foxborough MA 02035
508 698 7238 phone
508 698 7201 fax
617 803 7712 mobile
[log in to unmask]
Paul Watson
<PaulWatson@C To: [log in to unmask]
EMCO.COM> cc:
Sent by: Subject: Re: [LF] Whisker
Leadfree
<Leadfree@IPC
.ORG>
01/17/02
11:21 AM
Please
respond to
"(Leadfree
Electronics
Assembly
Forum)"
Franz,
Does this mean that a Hot Air Leveled Sn Cu finish has been discounted.
Paul Watson
-----Original Message-----
From: Franz Mustermann [mailto:[log in to unmask]]
Sent: Thursday, January 17, 2002 4:01 PM
To: [log in to unmask]
Subject: [LF] Whisker
Dear all,
for a leadfree finish solution the market favours Sn or SnBi. One
problem
using Sn is the creation of Whiskers.
I just heard about an underplating of nickel to solve that problem.
Are there any further informations/ experiences on this topic?
Franz
_________________________________________________________________
Mit MSN Fotos können Sie problemlos Ihre Fotos ausdrucken und anderen
Benutzern zur Verfügung stellen:
http://photos.msn.de/support/worldwide.aspx
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