Hi Steve,

I think rework might be a big reason.  The form factor might also be
important.  It certainly solves the low temperature process requirements
but most parts are already designed for solder reflow.

I personally have always avoided designing with screened adhesives but I
know a lot of people have overcome the process issues.  Who knows, maybe
this is uncharted territory but I have wonder what the workmanship
standard for a conductive adhesive chip cap might look like.

Phil

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, March 12, 2012 8:39 AM
To: [log in to unmask]
Subject: [TN] Assembling with conductive adhesive

Hey all,

 

Wish I hadn't lost that hour of sleep this weekend, I'll try to find it
tonight. :o)

 

Anyways, have any of you thought of trying to replace solder with a
conductive adhesive for PCB assembly? There's a few out there (Henkel,
Cookson, Ellsworth, etc.) that are touting them as solder replacements.

 

When I read the technical datasheets, I'm thinking to myself, why isn't
this stuff more widely used? There must be a reason. 

 

I do know it's pretty expensive almost all of them are silver filled,
and I have read that the mechanical strength and thermal conductivity is
not as good as solder, but what other reasons are out there not to use
it?

 

Steve



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