Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!sco!gorn!logo
From: logo@gorn.santa-cruz.ca.us (David Kiviat)
Newsgroups: sci.electronics
Subject: Re: Which is a better conductor: gold or silver?
Keywords: gold, silver, palladium, plating
Message-ID: <673@gorn.santa-cruz.ca.us>
Date: 6 Sep 89 04:18:50 GMT
References: <14172@swan.ulowell.edu> <19729@louie.udel.EDU> <20483@cup.portal.com> <996@maestro.htsa.aha.nl> <1986@kodak.UUCP> <23544@quack
Reply-To: logo@gorn.santa-cruz.ca.us (David Kiviat)
Organization: The Planet Gorn
Lines: 12


Hi! This discussion reminds me of a question I have had for many years
since I worked in a final test department of a large chipmaker. The company
decided they wanted to replace gold as the substrate (or was it the preform-
I forget-it's been a long time) with silver. They put a lot of research into
it and seemed to pull it off. The only problem I remember was that we had
to centrifuge all those chips and a fairly high percentage of them went
kabloey in the process. At the time we were told that despite the higher
losses the cost savings made the change worthwhile.
 
My question is did this catch on in the industry or is using silver instead of
gold to hold the die in place now a rare thing?