Characterization of the thermal performance of modern convection reflow ovens is important in
ascertaining the process window for a particular product or application. This is especially true
for lead free processes. Using typical manufacturing materials such as FR4 can be problematic
in that the product changes thermal characteristics after a relatively short number of thermal
excursions. Other potential test vehicles such as a stainless steel or aluminum plate are more
robust and able to withstand repeated thermal cycles, however, introduce significantly different
thermal conductivities that masks potential weaknesses in oven design. Trying to match these
physical properties within a single test vehicle is necessary in order to characterize the various
oven parameters. Such materials exist in composites with highly insulating properties similar to
typical FR4 material as well as a high tolerance to numerous thermal excursions. This paper
investigates the performance of three ...
With accurate monitoring of a reflow oven's operating parameters, SPC can track product quality and increase yields.