Adding to what Dave said; you don't get something for nothing! Different alloys have different physical characteristics and are used for correspondingly different purposes and applications. Don't attempt to use something not AABUS and fully documented on the applicable BOM.



-----Original Message-----

From: TechNet [mailto:[log in to unmask]] On Behalf Of David Hillman

Sent: Thursday, September 20, 2018 6:57 AM

To: [log in to unmask]

Subject: Re: [TN] High Temp SnPb solder



Hi Ben - yes, there are differences in the mechanical properties and the

solder joint microstructures for the "high temp" alloys. Most of those

alloys have applications in component construction, specifically in

component die attachment. One very common alloy used frequently in a number

of applications is the 10Sn88Pb2Ag alloy.



Dave Hillman

Rockwell Collins

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On Thu, Sep 20, 2018 at 6:40 AM, Gumpert, Ben <[log in to unmask]> wrote:



> TechNetters,

>

> J-STD-006 has a series of 'high temp' SnPb alloys (some with Ag) that are

> close in SOL/LIQ temps. I'm familiar with Sn10Pb90 as a common high-temp

> ball on ceramic BGAs, but I haven't seen the others used. Are there any

> differences (e.g. mechanical properties) among these that would drive

> selection, other than the SOL/LIQ?

> Are some alloys more readily available than others?

>

> Ben

>