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November 2007

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Subject:
From:
Werner Engelmaier /* <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 2 Nov 2007 14:40:51 EDT
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Hi Jack, 
Lee is absolutely correct to suggest that it is properties that should be 
specified,not specific base materials—and some people go further than that 
specifying actual performance requirements.
This is a complex situation and still rather in flux.
The best that I can suggest at this point is my White Paper [information 
below] on the subject—and the good thing is that it gets updated as the need 
arises.

Engelmaier Associates, L.C. developed a multi-client study/white paper 
titled: "WHITE PAPER REPORT: Recommendations for PCB FAB Notes and Specifications in 
Printed Circuit Board Drawings for SnPb and Lead-Free Soldering Assemblies, 
the Qualification of PCB Shops and Activities to Assure Continued Quality."   
As indicated by the title, in this report recommendations are made regarding 
appropriate specifications and ‘FAB Notes’ on drawings for printed circuit 
boards (PCBs), general procedures to qualify PCB shops and to assure they would 
be producing PCBs of good quality, and testing procedures to verify quality 
and reliability.  It contains examples—one for SnPb solder assemblies and one 
for RoHS-compliant Pb-free solder assemblies—of ‘FAB Notes’ serving as general 
specifications on PCB drawings being much more specific than IPC-4101B, a ba
sic questionnaire for new PCB shops to be qualified meant as a supplement to 
IPC-1710, as well as recommendations for ongoing activities to assure that 
qualified PCB shops maintain the quality of the PCBs produced by them. All the 
recommendations are fully discussed, carefully researched and referenced. 



Regards,
Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL 32174 USA
Phone: 386-437-8747, Cell: 386-316-5904
E-mail: [log in to unmask], Website: www.engelmaier.com



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