Which SN100C? The properties of SN100C from one vendor such as Kester K100LD are completely different than any SAC305, and also different from other Sn100C alloys. It depends on the dopant added. I have used K100LD for many military applications only because I became very familiar with it during testing of its properties at the Navy testing site on a special project. It has both drop shock and load cycling properties that are quite similar to Sn63, and was selected by the Navy as a preferred alloy over the much more brittle Sn100C alloys that are out there.
http://www.kester.com/kester-content/uploads/2013/03/Tin-Copper_Based_Solders-for_Electronic_Assembly.pdf
I have no financial interest or any other association with Kester. I am only suggesting this alloy because it has proven to be a very good alternative if you need a lead-free that has better wetting as well as an improvement in the modulus of elasticity than Sn100C or, God forbid, SAC305. And it is much less costly.
It has been several years since I qualified this alloy, however. There may be many other new products out there. Just be sure you look at the cost and some of the performance characteristics (or lack thereof). You need to perform a good qualification based on the product you intend to use the solder on. As an example, many SACxxx alloys simply will not fill the plated through holes in an .093" thick PWB with any mass, as the SAC alloys do not wet very well. There are many things to consider. These are not "minor differences"; they can cause a huge difference in reliability, rework costs, etc.
dean

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Datacom - Juliano Ribeiro
Sent: Tuesday, March 08, 2016 5:34 AM
To: [log in to unmask]
Subject: [TN] SAC x SN100C

Hi to all,

 

What are the differences about SAC305/0307 vs SN100C (reliability criteria and process specification)?

I read about SAC0307 and SAC305 and the article shown that SAC0307 is better about Drop Shock but the SAC305 is better about Thermal Cycle. I would like the same comparison about SAC vs SN100C.

 

Thank you a lot

_____________________________

Juliano Bettim Ribeiro

DATACOM 

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