(1) you need excellent pick and place machine (no self centering surface tension to help you).  
(2) you need to pick a good vendor with high quality silver loading (higher silver = good conductivity but poor adhesion).  Few of them can do it properly.
(3) you need good interface bonding with close contact of silver flakes during the life of the product.  Not all of paste can do that (changes conductivity as time goes by)
(4) you need components termination that can be bonded to adhesive, not all vendor supply that part or have that options.
(5) you need good dispensing machine or pad printing machine.  Not everybody who get use to stencil would want to (high resistance implementation).  Unless you want to use ACF (capital equipment cost). 
(6) if you can overcome above 1-5, very nice to use the conductive adhesive.  

Joyce Koo
Materials Researcher - Materials Interconnect Lab
Research In Motion Limited
Office: (519) 888-7465 79945
Mobile: (226) 220-4760

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Monday, March 12, 2012 11:39 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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