Yea I read that article posted there about the Millstone Dominion Nuclear
Reactor shutdown on April 17th 2005.due to Tin Whisker growth on a circuit
card in the controls for the station. It looks like NASA has been tracking
Tin whisker growth for the last 60 years or so... they should have a lot of
data on the subject... They mentioned the 9mm a year growth in the article.
That's about a 1/3 of an inch which would short most IC's with normal gull
wing pins... even DIPs would short...
And they still don't know what the mechanism is that causes it... only that
Tin/lead alloyed together reduces it greatly.


Bill Brooks - KG6VVP
PCB Design Engineer, C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
Datron World Communications, Inc.
_______________________________________
San Diego Chapter of the IPC Designers Council
Communications Officer, Web Manager
 <http://dcchapters.ipc.org/SanDiego/> http://dcchapters.ipc.org/SanDiego/
 <http://pcbwizards.com> http://pcbwizards.com
-----Original Message-----
From: Jack C. Olson [mailto:[log in to unmask]]
Sent: Monday, August 08, 2005 3:23 PM
To: (Designers Council Forum); Brooks,Bill
Cc: [log in to unmask]
Subject: Re: [DC] Just say 'NO' to RoHS is plain wrong?


Yes, but heed the disclaimer under the picture:
"Motion depicted is for simulation purposes only"

I think the world-record whisker growth was 9mm per YEAR!
(NASA Research)

Jack






"Brooks,Bill" <[log in to unmask]>
Sent by: DesignerCouncil <[log in to unmask]>
08/08/2005 04:49 PM

Please respond to
"(Designers Council Forum)" <[log in to unmask]>; Please respond to
"Brooks,Bill" <[log in to unmask]>


To
To
[log in to unmask]

cc



Subject
Re: [DC] Just say 'NO' to RoHS is plain wrong?




Caterpillar: Confidential Green        Retain Until: 09/07/2005
Retention Category:  G90 - General Matters/Administration


What an amazing website...
Check out the whiskers on this page...
http://www.nepp.nasa.gov/WHISKER/


Bill Brooks - KG6VVP
PCB Design Engineer, C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
Datron World Communications, Inc.
_______________________________________
San Diego Chapter of the IPC Designers Council
Communications Officer, Web Manager
http://dcchapters.ipc.org/SanDiego/
http://pcbwizards.com

----------------------------------------------------------------------------
-----
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV
1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET
DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases >
E-mail 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
----------------------------------------------------------------------------
-----

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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
---------------------------------------------------------------------------------