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siteco electrical component is a varactor diode, also known as a "variable reactance diode," made by utilizing the characteristic that the junction capacitance of a PN junction changes with the applied voltage when reverse-biased. As the reverse bias voltage increases, the junction capacitance decreases; conversely, it increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, for example, as a variable capacitor in the tuning circuit of a television receiver. Main parameters include: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, and center reverse bias.