Different types of QFN packages are used based on the specific application's needs: What Are QFN Packages | Sierra Circuits
QFNs lack traditional exterior leads, instead using metalized terminal pads on the bottom. This "near chip-scale" footprint makes them 62% smaller than traditional TSSOP packages. baoufst-qnlfn
The low-profile, leadless construction makes these packages physically sturdy and less prone to damage during handling. Common Variations Different types of QFN packages are used based