I can't comment on whether or not NASA or the Airforce has ever
encountered problems with Sn/Ag alloys. I'm not saying that every board
built with Sn/Ag will fail. Joint strength is dependent upon several
factors. I guess the bottom line is, failures appear to be more
likely/common with this alloy versus SAC alloys, which is one reason why
the industry has embraced SAC alloys more so than Sn/Ag alloys.
Dave
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of Smith, Rick
Sent: Wednesday, August 03, 2005 5:17 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305
Why hasn't NASA or the Airforce ever complained about this?
Seems to me they have specified use of the Sn96 and Sn96.5 alloy on many
programs for many years??
Rick Smith
Senior Product/ Component Engineer
Phone: (512)652-3544
Fax: (512)652-3545
Cell: (512)299-6925
Email: [log in to unmask]
ClearCube Technology, Inc
8834 Capital of Texas Hwy N
Austin, TX 78759
www.clearcube.com
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of David Suraski
Sent: Wednesday, August 03, 2005 1:50 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305
... and don't forget the silver phase change problems and poorer
mechanical fatigue resistance as compared to Sn/Ag/Cu.
Regards,
David Suraski
AIM
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of MA/NY DDave
Sent: Wednesday, August 03, 2005 2:38 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305
Hi KEDS-Rich, John, SPVC, IPC LF Listservers
Stopping for a minute on this fun discussion/learning experience.
If you decide to use 96.5Sn you do know that your soldering temperature
will be higher and you might have component MSL problems. I know it is
only a few degrees yet you don't have lots of margin on some of your
products.
YiEngr, MA/NY DDave
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