Could anybody on the TechNet planet tell me the primarily reasons for 
using this Sn96,5Ag3,5 solder alloy?
It looks like this alloy has been already in use for some years as 
solder wires and solder paste for small electronic modules.
Also, I seem to remind that this was the first alloy of choice for 
lead-free BGA spheres before the industry consensus for SAC.
Why did the industry switch to SAC instead of SnAg? In other words, what 
does the copper bring?

A. Grivon

Juan T. Marugán a écrit :
> Hi,
>
> in a Class 3 product (aerospace) we have to solder some wires to a PCB
> using a Sn96,5Ag3,5 solder alloy. Wires are silver coated, high-strength
> copper alloy and the PCB is SnPb plated.
>
> My first question is, Do you consider that solder alloy as a good option?
>
> Besides, in a near future, we will change the finish of the PCB from SnPb
> to ENIG. In that situation, what solder alloy do you recommend us?
>
> Thank you in advance.
>
> Juan T. Marugán
> Production QA
> Indra Sistemas SA
> Spain
>
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