What We Can Learn from Singapore
A tour of seven facilities in the city-state opens the author’s eyes to an emerging government-industry infrastructure for responding to continually changing market conditions and business needs.
By Susan Mucha
BGA Reballing Reliability
During solder ball removal, a manual method using wicking braid resulted in fewer thermal stresses than would be encountered with a flowing solder bath. But a robust nickel layer on the component provides a very effective barrier against copper dissolution during the latter.
By Ray Cirimele
Cell Efficiency is Key to Success of Photovoltaics
Unlike semiconductors, there appear to be no technical barriers to the acceptance of new PV technologies. Photovoltaics will be governed more by economics than by any performance specifications, and the economics of these devices depend on little more than manufacturing cost and efficiency.
By Alain Harrus and Jim Handy
On the Use of 3 Thermocouples to Verify a PCB Profile During Reflow
By simulating changes to the oven – performed by altering belt speeds and a temperature zone from the baseline profile – evidence shows that by putting tight specifications on the two response variables for the temperature profiles of the three T/Cs located on the surface of the laminate’s leading edge, one can effectively verify the board’s characterization profiles are still within specification.
By Daryl L. Santos, Arun Ramasubramanian and Laurence A. Harvilchuck
On the Cover: A Pb-free flowing solder bath is expected to cause copper dissolution, but the nickel layer on some BGAs prevents solder from leaching.