Journal of SMT Article

Validated Solder Coverage for Tin Whisker Mitigation of 0402 Ceramic Capacitors: An Exercise in Technically Sound Cost Reduction

Author: Bruce M. Misner
Company: Orbital ATK, Defense Electronic Systems Division
Date Published: 9/1/2016   Volume: 29-3

Abstract: Most Department of Defense (DoD) programs demand tin-whisker mitigation to enhance long-term reliability. This typically necessitates tin-lead (Sn/Pb) solder dipping of tin plated components to combine the tin with at least 3% lead. This technique has been proven throughout the industry to mitigate tin-whisker growth [1,2,3]. As a cost saving measure, a project was designed for 0402 capacitors to validate Sn/Pb solder coverage from conventional SMT soldering operations is equivalent to solder dipping. This paper presents the micro-sectioning, extensive X-Ray Florescence (XRF) testing and supporting analysis to demonstrate a cost-effective, 5 sigma process to mitigate tin whiskers can be achieved in lieu of solder dipping.

Keywords: 

Tin Whisker, Validated Solder Coverage, Mitigation, XRF, Micro-section, Variability



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