The SMTA Officer team is excited to provide our members with a free technical webinar on "The Relationship Between Cleanliness and Reliability/Durability” by Debbie Carboni, Global Product Manager at KYZEN Corporation. The presentation will take place on June 10th at 11:00am EST and 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/cm² 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 an extremely competitive market and reduce your cost while improving brand reputation.
The SMTA membership is an international network of professionals who build skills, share practical experience and develop solutions in electronic assembly technologies, including microsystems, emerging technologies, and related business operations. For more information or to join, please visit www.smta.org.