Hi Steve - my comments:
1) There are ImSn pwb surface finish formulations that will produce tin
whiskers and there are ImSn pwb surface finish formulations that will not
produce tin whiskers. Conduct testing and don't completely believe the
Marketing literature.
2) There are only a handful of published reports (3) which show a tin
whisker growing out of SAC305 solder. The reports show that excessive
ionic cleanliness levels were the root cause of the tin whiskers. There
are several industry investigation currently in progress on the specific
topic of ionic cleanliness levels and tin whiskers. Best guess is that
some of the investigations will be published later this year.
Dave Hillman
Rockwell Collins
[log in to unmask]
Steve Kelly <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
03/24/2010 12:30 PM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
Steve Kelly <[log in to unmask]>
To
[log in to unmask]
cc
Subject
[TN] Tin Whiskers
Hi All,
Two questions today:
1) Any known instances of tin whiskering when the finish is Immersion
Tin
2) Any known instances of tin whiskering after the immersion tin is
soldered with a RoHS compliant solder such as SAC 305.
Thanks. Steve Kelly
PFC_2col.png
CREATING A FLEXIBLE FUTURE
Steve Kelly
(416) 750-8433 (work)
(416) 750-0016 (fax)
(416) 577-8433 (cell)
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to
[log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to
[log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16
for additional information, or contact Keach Sasamori at [log in to unmask] or
847-615-7100 ext.2815
-----------------------------------------------------
______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________
---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------