This part of IEC 60747 gives requirements for the following categories of discrete devices variable capacitance diodes and snap-off diodes (for tuning@ up-converter or harmonic multiplication@ switching@ limiting@ phased shift@ parametric amplification) mixer diodes and detector diodes avalanche diodes (for direct harmonic generation@ amplification) gunn diodes (for direct harmonic generation) bipolar transistors (for amplification@ oscillation) field-effect transistors (for amplification@ oscillation)