low thermal emf solder & paste - SAC 405

I've never used SAC405. Not for nothing ...

Other low temperature solder alloys that you should consider are: * Sn42/Bi58 [138*C]: Alloy for low temperature applications. Attention should be paid to potential embrittlement issues and poor thermal fatigue properties. * Sn42/Bi57/Ag1 [138*C]: Similar characteristics to Sn42/Bi58 with improved fatigue characteristics. * In97/Ag3 [143*C]: Alloy for low temperature applications. Costly due to high indium and silver contents. Attention should be paid to corrosion, joint strength and fatigue issues. These points were made in an excellent, although maybe somewhat dated paper [http://www.smtnet.com/library/index.cfm?fuseaction=view_article&article_id=1975] ]

BR ... davef

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What is the product for? If you share more information maybe there is another way of dealing with the issue, like removal of the joints by a different circuit design.

sarason

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Hello Michel...this might be a bit of a battle finding the low thermal EMF material that you are looking for. The first one that comes to my mind is Bismuth Selenium Telluride, with either a nickel or cobalt doping agent. Silver went away from this process early on. There is a Company called Marlow Industries in or around Dallas Texas that might be able to give you more information on RoHS compliant materials that are used in their process for the Peltier Effect.

Cheers, Anvil

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