Hi Rich and everybody,

What's the storage environment?
What's the level of reliability?

(Maybe they should try the 'best use by date' marketing scheme I see
everywhere.  ;-)

Hans

~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Materials (Process & Manufacturing) Engineer
Warner Robins Air Logistics Center
Avionics Production Division
Manufacturing Branch
380 Second Street, Suite 104
Building: 640, Mail Stop: LYPME
Robins AFB, GA 31098-1638
Voice: (912) 926 - 1970 Fax: (912) 926 - 7164
mailto:[log in to unmask]
http://www.robins.af.mil

-----Original Message-----
From: Olsen, Richard [mailto:[log in to unmask]]
Sent: Wednesday, April 19, 2000 6:59 PM
To: [log in to unmask]
Subject: [TN] Five year storage finish


Hello,
        Below is a question sent to me. Does anyone have any suggestions?
Thanks
Rich

I do have a question that you might be able to help me with.  We have a
customer that is building something like an electronic hotel room key
(double sided board) which will be stored for up to 5 years prior to use...
and then the key will be used only once.  We are trying to figure out what
type of surface finish to tell them to use.  There is a single surface
mount IC mounted to the board... otherwise, there are contacts on one edge
that will be used to connect the key to the "lock" when it is used.  In
your experience of talking to the Tech Net people, have you come across a
solution to this type of requirement?  My first inclination is to use Ni /
Au plating with a thick (20+ microinches) deposition of Au.  Being a cheap
double sided board, they are really price conscious, so they want to keep
it as cheap as possible.  I don't know if HASL will provide a good contact
after that long on a shelf...

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