Provides 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).