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Statistical analysis of the impact of refinishing process on leaded components

Statistical analysis of the impact of refinishing process on leaded components

Yin, Chunyan ORCID: 0000-0003-0298-0420, Best, Chris, Bailey, Chris ORCID: 0000-0002-9438-3879 and Stoyanov, Stoyan ORCID: 0000-0001-6091-1226 (2015) Statistical analysis of the impact of refinishing process on leaded components. Microelectronics Reliability, 55 (2). pp. 424-431. ISSN 0026-2714 (doi:

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Refinishing process such as Hot Solder Dip (HSD) process can be used to prevent tin whisker growth in microelectronics components by replacing the lead-free finishes with conventional tin–lead coatings. In some applications, it is also used to ensure reliable solder joints by replacing contaminated finishes and lead-free alloys with tin–lead to result in a homogeneous solder joint with tin–lead paste. In this paper, the impact of a HSD refinishing process on leaded components was statistically studied by comparing the electrical test data of refinished samples with those not-refinished. The likely damage from the component refinishing was thought to be the degradation of package integrity through thermo-mechanical stressing. This might be detectable as a microscopic leakage current if moisture could be encouraged into any open areas. Ten types of leaded components were selected and samples for each type of the component were allocated into 2 lots, one for refinishing and one used as a control. 150 cycles −65/150 °C thermal cycling followed by 500 h 85%RH/85 °C humidity test was applied to all the samples (both refinished and not-refinished) to amplify any incipient failure points and accelerate moisture ingress into the package. Electrical test was then carried out to measure any small changes in current under zero and reverse bias conditions. In the end, a data reduction process in conjunction with a statistical hypothesis test was used to analyze the electrical test data. The results showed that there was no significant difference between the measured currents of refinished and not-refinished post-aged samples. Therefore it was concluded that the refinishing process did not have a significant impact on the tested components. This conclusion was further strengthened by other experimental test results such as CSAM images.

Item Type: Article
Additional Information: [1] Acknowledgments (funding): Authors would like to acknowledge the contributions made by Rolls Royce, Selex Galileo, Cassidian Electronics (an EADS company) and General Dynamics.
Uncontrolled Keywords: statistical hypothesis testing, refinishing, hot solder dip, leaded component, lead-free
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculty / School / Research Centre / Research Group: Faculty of Engineering & Science > Centre for Numerical Modelling & Process Analysis (CNMPA) > Computational Mechanics & Reliability Group (CMRG)
Faculty of Engineering & Science > School of Computing & Mathematical Sciences (CMS)
Faculty of Engineering & Science
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Last Modified: 04 Mar 2022 13:07

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