• A pn-junction diode operated with reverse bias, so that it functions as a voltage-dependent capacitor. The p and n regions each act as the plates, with the depletion layer serving as the dielectric. Its capacitance varies as a function of its applied voltage, and is used, for instance, for electronic tuning. It is an acronym for variable reactor. Also called varactor diode, varicap, varicap diode, variable-capacitance diode, or voltage-variable capacitor.
  • synonymvariable reactor
  • synonymvariable-capacitance diode
  • synonymvaricap
  • synonymvaricap diode
  • synonymvoltage-variable capacitor