DFN Flat Chip Diodes Comchip Technology DFN flat chip diodes are thin, small, and light diodes with size-reduction technology that makes them ideal for portable and handheld devices and perfect as a drop-in replacement in space-limited designs. Comchip DFN flat chip switching, Schottky, and zener diodes comply with RoHS without tin-whisker concerns and provide highly accurate, highly efficient performance.