SMT007 Magazine

SMT-Aug2018

Issue link: https://iconnect007.uberflip.com/i/1010078

Contents of this Issue

Navigation

Page 64 of 99

AUGUST 2018 I SMT007 MAGAZINE 65 from the IC test. The sodium and chloride ion results from the IC test were added together to be able to make the comparison to the ROSE results. Please be aware that this is not an exact comparison of the results from the two tests because of how their units are defined (μg of NaCl equivalents/cm 2 vs. μg/cm2). Comparing the ROSE results to the IC results, we found that the IC test gave a substantially higher response on four of the five tested BGA groups when comparing just two ions. If you consider all the ions that were measured by the IC compared to the ROSE results, there was no comparison. The IC test provided far more insight into the ionic cleanliness of all five BGA groups. Please be aware that we are not making a claim in this study about "how clean is clean enough?" We are showing that the ROSE test is an inadequate tool for low level evaluations of ionic residues as are needed for modern electronic products. SMT007 References 1. SMTA International 2017 Conference Proceedings, "PCBA Component Cleanliness Specifications Limits are Lacking." 2. GEIA-STD-0006 Joe Russeau is president and CEO of Precision Analytical Laboratory. To contact Russeau, click here. Mark Northrup is VP of technology with IEC Electronics. Figure 2: IC versus ROSE method.

Articles in this issue

Archives of this issue

view archives of SMT007 Magazine - SMT-Aug2018