The Relationship Between Cleanliness and Reliability/Durability

ABSTRACT Organized by SMTA Capital Chapter The presentation will include: Process Qualification/Monitoring test results vs. SIR/HTHE results on live product Examples of these qualification parameters follow, but ended in field failures due to dendrites What environments pose the greatest risk. What areas of the assembly tend to be most problematic Steps necessary to monitor and maintain consistent cleanliness Cleaning or lack thereof can have a serious impact on the long-term durability and reliability of some finished products. Using a single number conductive measurement limit as a control basis for key precision or critical cleaning processes can be tremendously risky and expensive. IPC removed from the J-STD-001 Rev. H, the ROSE limit of 1.56ug/cm 2 as a statement of “Clean” due to modern flux, component, and board designs. One size no longer fits all with today's technology. This is the reason the IPC J-STD-001 no longer sets a limit for the ROSE, and in fact WP-019B states “passing the ROSE test using the 1.56 value, does not guarantee that an assembly is clean, good or acceptable.” Likewise, the PM-019B also states there are no pass-fail levels for Cation or Anion levels in Ion Chromatography. The question, answer, and responsibility fall on the manufacturer and/or OEM to determine the acceptable ROSE limit will meet their cleanliness needs for reliability, based on objective evidence. In this presentation we will explore how a PCB can achieve a ROSE value under the previous 1.56 ug/cm recommended limit, as well as industry acceptable limits of ion chromatography, yet still not meet the reliability and durability requirements of field operation. Dendrites formed causing field failures even after cleaning to the previously stated acceptable limits. By modifying the process parameters of the cleaning process, conducting chemical and electrical testing to validate it meets acceptable performance under harsh conditions, one can use objective evidence to re-establish the correct ROSE value. This exercise re-confirms the relationship between cleanliness and a product's reliability and durability in the field. This paper will walk through the necessary steps needed to determine what the acceptable number is required to meet each product reliability demands and why. We will further explore why some products can pass with a higher number and/or a different cleanliness measurement, how you can avoid mistakes in a very competitive market, and reduce your cost while improving brand reputation. Speaker Biography: DEBBIE CARBONI Global Product Manager (Electronics) KYZEN Corporation & Vice President Philadelphia SMTA Chapter Debbie Carboni is the Global Product Manager of Electronics for KYZEN Corporation and brings over 25 years of experience to the electronics manufacturing industry. She continues to learn and stay up to date on the latest technology by attending technical conferences and assisting in leading-edge research. Debbie has authored and co-authored several papers related to cleaning solutions and regularly presents at and attends industry events. Her experience includes serving as VP of Expos on the SMTA Board of Directors (2014-2020), current Vice President of the Philadelphia SMA Local Chapter as well as various SMTA committees. A strong advocate of women in industry, Debbie is a very active member of the SMTA Women™s leadership committee and participates regularly in annual and focused eventss. Her extensive real-world experience helps guide engineers during qualification to ensure success in production conditions. Always willing to share, Debbie is an excellent resource with extensive experience and passion. On Demand Webinar