Rich - I would suggest you consider the following to meet your customer's
requirements: (1) I would go to about 35 microinches or more of Gold over
100 microinches of Nickel. The higher Gold thickness would be to eliminate
any Gold porosity over the Nickel. (2) Coat the contacts with a preservative
& lubricant such as ProGold or Deoxit from Caig Labs www.caig.com . (3) Seal
the units in zip-lock ESD bags like you would get from Static Control
Components www.scc-inc.com . Ed/

Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com

----- Original Message -----
From: Olsen, Richard <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, April 19, 2000 6:59 PM
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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