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July 2006

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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:
Tue, 25 Jul 2006 09:48:08 EDT
Content-Type:
text/plain
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text/plain (51 lines)
Hi Krishnan,
Much of whether PCBs survive the soldering processes depends on how you have 
specified your PCBs. TM-650 Section 2.4.24C - Glass Transition Temperature & 
Z-Axis Thermal Expansion by TMA & Section 2.4.24.1 - Time To Delamination (TMA 
Method) & Section 2.4.25C - Glass Transition Temperature & Cure Factor By DSC 
are indeed very important; however, they are only part of the story. 
The White Paper below can be of great help, because it not only fully 
explains the need for the above properties, but also explains the differences between 
Tg by TMA, DSC and DMA test methods. Of course, it also details all the other 
parameters that are important for properly spec'ing PCBs.

Engelmaier Associates, L.C. just finished 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, a basic questionnaire for new PCB shops to be 
qualified meant as a suppliment 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 researched and 
referenced with 51 references. 
The cost of the 25-page report is $495.-; it will be delivered as a pdf-file 
upon receipt of a check or purchase order.
Attached please find a report outline together with part of a report section 
to provide you with a sample of the report contents.

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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