The Use of Strip Chopping Cut Method for the Reduction of Blade Overloading in Wettable Flank QFN Half-Cut Singulation Process

One of the crucial steps in the assembly of wettable flank QFN is the half-cut singulation. It is a process wherein a mechanical blade is used to introduce step cut feature on the package. For half-cut singulation, it is desirable to have higher production output, higher yield, and longer blade life. But these are hindered by blade overloading caused by too much stress on the blade during sawing. Mitigation of blade overloading is of high importance. Thus, the aim of this work is to use strip chopping cut approach for the half cut singulation of wettable flank QFN package.