Sawn leadless package having wettable flank leads

A method of forming a leadless packaged semiconductor device. First partial sawing leads is performed on a bottom side of an in-process leadless semiconductor package having a leadframe including die pad with a semiconductor chip thereon, and leads defining top and bottom surfaces and having an inner end and an outer end having a bottom corner region. Conductive bond wires connect to and extending between bond pads on the chip and respective leads, a mold compound is around the die pad, leads, chip, and conductive bond wires while exposing the bottom surface and outer end. The first sawing completely severs the leads while forming only a partial cut in the mold compound. A de-flash process is applied to the bottom side. The second sawing aligned to the partial cuts reaches the partial cuts to complete singulation of the package, wherein the second sawing does not touch the leads.