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SMTAI Papers Cover Diverse Topics
August 23, 2006 |Estimated reading time: 1 minute
HAVERHILL, Mass. and FREEMONT, Calif. SMTAI 2006 will features numerous paper presentations covering diverse and innovative topics within the electronics manufacturing market. Two papers, presented by Stuart Erickson and David Bernard, respectively, include information from dispensing control for conformal coating to detecting popcorning in lead-free BGAs.
Stuart Erickson, president of Ultrasonic Systems, Inc., will present "Precision Coating Deposition Techniques for Conformal Coating Applications," which will discuss significant improvements in coating deposition control, achieved with a combination of advanced ultrasonic coating technology and digital dispensing. The combination is argued to provide precise control of coating pattern and thickness. Erickson will address challenges including "applying coating to very small areas without masking, keeping thin coatings uniform, and managing inherent problems with water-based coatings," he explained. The presentation will also provide an overview of ultrasonic spray technology and micro-line digital dispensing.
David Bernard, product manager for X-ray Systems at Dage Precision Industries, will present a technical paper on inspecting popcorned BGAs, titled "Correlating the Presence of Popcorned BGA Devices Post-reflow with Solder Ball Diameter Measurements from X-ray Inspection." Bernard will focus on X-ray inspection techniques and the concomitant effects popcorning has on product reliability as a result of increased moisture sensitivity levels (MSLs) during lead-free reflow processes.
Critical items include the results of solder ball diameter inspection measurements, performed using an X-ray, of suspected popcorned lead-free BGAs placed on several different board finishes, and the correlation of these measurements to identifying popcorned BGAs.