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Solder Fatigue Impacts of Conformal Coating for Tin Whisker Mitigation on Chip-Scale Thin Small Outline Packages

[+] Author Affiliations
Karl J. L. Geisler

General Dynamics Advanced Information Systems, Bloomington, MN

Paper No. InterPACK2009-89312, pp. 915-920; 6 pages
doi:10.1115/InterPACK2009-89312
From:
  • ASME 2009 InterPACK Conference collocated with the ASME 2009 Summer Heat Transfer Conference and the ASME 2009 3rd International Conference on Energy Sustainability
  • ASME 2009 InterPACK Conference, Volume 1
  • San Francisco, California, USA, July 19–23, 2009
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 978-0-7918-4359-8 | eISBN: 978-0-7918-3851-8
  • Copyright © 2009 by ASME

abstract

This study explores the impact of polyurethane conformal coating on the solder fatigue life of 0.5 mm pitch, thin small outline package (TSOP) components. Test samples were subjected to temperature cycling from −40°C to + 100°C. Uncoated samples were tested in addition to sets with 10, 13, and 20 μm thick coatings. Solder joint failure data fit to 3-parameter Weibull distributions demonstrate characteristic fatigue life reductions of 30% with increasing coating thickness but relatively subtle changes to the failure distribution shape.

Copyright © 2009 by ASME

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