In a message dated 10/30/0 14:53:41, [log in to unmask] writes:
> I've been approached by a member of our design group regarding the
>use of a 2010 chip resistor.  We have historically stayed away from these
>"large" chip parts due to concerns over potential TCE mismatch with FR-4
>material.  Those concerns are being questioned.
>For commercial work, expected to operate for many years in uncertain
>environments (Programmable Logic Controllers), are there real reliability
>concerns?
Hi,
The short answer is: YES
A more comp[lete answer can be obtained by using the material in Appendix A
of IPC-D-279, Design Guidelines for Reliable Surface Mount Technology Printed
Board Assemblies.

Werner Engelmaier
Engelmaier Associates, L.C.
Electronic Packaging, Interconnection and Reliability Consulting
7 Jasmine Run
Ormond Beach, FL  32174  USA
Phone: 904-437-8747, Fax: 904-437-8737
E-mail: [log in to unmask], Website: www.engelmaier.com

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