Hi Gregg - as a general rule of thumb, the industry uses the Sn63, Sn60 
and Sn62 tin/lead solder alloys a interchangeable. The IPC JSTD 001E, 
paragraph 3.2,  lists those three alloys as interchangeable: also,  the 
IPC JSTD-001 Handbook and  the IPC AJ 820A Handbook both have some good 
information on the slight differences between the three alloys.  Mixing 
should not be an issue.

Dave Hillman 
Rockwell Collins
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From:   Gregg Owens <[log in to unmask]>
To:     <[log in to unmask]>
Date:   03/12/2013 05:44 PM
Subject:        [TN] Mixing Solders
Sent by:        TechNet <[log in to unmask]>



I have an industry friend who asked me the following question and I did 
not have a good enough reply. So I thought I would put it out there on 
TechNet.

What are the possible problems with tin dipping a gold plated contact with 
63/37 then soldering it in a (PCB) board using 60/40 solder ?



2.    What arguments could I use to move away from using the 60/40 and use 
just the 63/37 for the product (i.e. Do you believe one has any benefit 
over the other)?



3.    Are you aware of any problems mixing the solder types ? (63 / 37 and 
60 / 40)

Your thoughts and comments are appreciated.

Gregg Owens

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