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February 1997

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Subject:
Re: ASSY: SOLDER ALLOYS AND BGAs
From:
"ddhillma" <[log in to unmask]>
Date:
Wed, 19 Feb 97 05:35:58 cst
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     Hi Jim-
     
     Several of the Sn/Pb/Bi solder alloys have "hot shortness" problems at 
     98C (a eutectic melting point). I believe that some information 
     covering Sn/Pb/Bi alloys will be covered at IPC Expo on Tuesday 
     morning as part of the NCMS Lead Free technical session. I know of 
     several Sn/Pb/Bi alloys in industry use (43Sn/43Pb/14Bi the most 
     prevalent) but they all have use environments below 98 C. I would do 
     some testing in your use environment to see if reliability problems 
     arise.
     
     
     Dave Hillman
     Rockwell Collins
     [log in to unmask]


______________________________ Reply Separator _________________________________
Subject: ASSY: SOLDER ALLOYS AND BGAs
Author:  [log in to unmask] at ccmgw1
Date:    2/15/97 9:50 AM


Dear Technet:
     
A prominent component manufacturer uses a Pb46 Sn46 Bi8 alloy for the balls on 
BGAs.  Can anyone think of any problems soldering these with Sn63 solder paste? 
Any metallurgical or reliability issues?
     
Thanks
     
Jim Marsico
(516) 595-5879
[log in to unmask]
     
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