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NEMI Tin Whiskers Group to Outline Recommendations for Accelerated Test Methods at SMTA International Conference
August 27, 2003 |Estimated reading time: 1 minute
Herndon, Va. — The National Electronics Manufacturing Initiative's (NEMI's) Tin Whisker Accelerated Test Project will present its recommendations for tin whisker testing at the SMTA International conference in Chicago (September 21 through 25).
Other NEMI activities that will be discussed at the conference include the latest NEMI roadmap, process and reliability results from NEMI's Lead-Free Assembly Project, and the consortium's recommendations for development of a "Perfect Bill of Materials" (BoM).
The need to better understand whisker growth has increased significantly as component suppliers convert from tin-lead (SnPb) finishes to Pb-free finishes of Sn and low-alloy-content Sn-based finishes. Whiskers are tiny metal filaments emanating from the surface finish. The problem is that these whiskers may grow long enough to cause short-circuiting or break off and interfere with other devices in an application. Currently, there is no industry-accepted test to assay the propensity of a plating finish to whisker and to estimate the risk of whisker growth for a given plating process.
NEMI's Tin Whisker Accelerated Test Project, formed in 2001, has evaluated different environmental factors influencing whisker growth. Based on the results of these investigations, NEMI is recommending three tests (two storage conditions and one temperature cycle condition) to help determine the whisker growth propensity of plating finishes. NEMI is also coordinating closely with JEITA (in Japan) and SOLDERTEC (in the U.K.) to define testing parameters. The recommendations will be submitted to JEDEC, the Solid State Technology Association (formerly known as the Joint Electronic Device Engineering Council), for release. The National Electronics Manufacturing Initiative's mission is to facilitate leadership of the North American electronics manufacturing supply chain. For more information, visit www.nemi.org.