If the design is good (consider the CTE mismatch at front), no issue. Joyce Koo Materials Researcher - Materials Interconnect Lab Research In Motion Limited Office: (519) 888-7465 79945 Mobile: (226) 220-4760 -----Original Message----- From: Stadem, Richard D. [mailto:[log in to unmask]] Sent: Monday, March 12, 2012 12:14 PM To: TechNet E-Mail Forum; Joyce Koo Subject: RE: [TN] Assembling with conductive adhesive You also need to understand the long-term reliability characteristics of silver-filled epoxy, with your design. It does not usually last as long as solder, especially not under severe thermal cycling. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo Sent: Monday, March 12, 2012 10:52 AM To: [log in to unmask] Subject: Re: [TN] Assembling with conductive adhesive (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 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------------------------- This transmission (including any attachments) may contain confidential information, privileged material (including material protected by the solicitor-client or other applicable privileges), or constitute non-public information. Any use of this information by anyone other than the intended recipient is prohibited. If you have received this transmission in error, please immediately reply to the sender and delete this information from your system. Use, dissemination, distribution, or reproduction of this transmission by unintended recipients is not authorized and may be unlawful. ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________