Variable Capacitance Diodes

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product details

Given the wide range of product categories and the continuous introduction of new products, the models in this list may not fully cover all options. We sincerely invite you to consult at any time for more detailed information.

Variable Capacitance Diodes
Manufacturer	Package	Operating Temperature

Series Resistance (Rs)	Reverse Voltage (Vr)	Capacitance Ratio

Diode Capacitance	Reverse Leakage Current (Ir)

Variable Capacitance Diode is a special semiconductor device that uses reverse bias to change the capacitance characteristics of the PN junction, thus achieving the tunability of capacitance.

Definition and characteristics

Definition: A varactor diode is a semiconductor diode that adjusts its junction capacitance by changing the reverse bias voltage. It is equivalent to a variable capacitor, and the PN junction capacitance between its two electrodes decreases with the increase of the reverse voltage.

Characteristic: The relationship between the reverse bias voltage and junction capacitance of a varactor diode is nonlinear. When the reverse voltage increases, the depletion layer widens, resulting in a decrease in capacitance; Conversely, when the reverse voltage decreases, the depletion layer becomes narrower and the capacitance increases.

application area

Automatic frequency control (AFC): Varactors are widely used in automatic frequency control circuits to change the frequency of oscillators by adjusting their capacitance, thereby maintaining consistency with the frequency of the received signal.

Scanning oscillation: In the scanning oscillation circuit, the varactor diode can generate a signal with a frequency that varies over time, which is used for scanning functions in radar, ultrasound, and other devices.

Frequency modulation and tuning: Varactor diodes are also used in frequency modulation circuits and tuning circuits. For example, the electronic tuner of a color TV set changes the junction capacitance of the varactor diode by controlling the DC voltage to select the resonant frequency of different channels.

Packaging form

Varactors are available in various packaging styles to cater to diverse application requirements

Glass sealing: Small and medium-power varactor diodes are often packaged in glass enclosures, which provide good sealing and stability.

Plastic encapsulation: Some varactor diodes are also encapsulated in plastic to reduce cost and weight.

Gold sealing: For varactor diodes with high power, metal casing is often used for packaging to improve heat dissipation and reliability.

Variable Capacitance Diodes

Schottky Barrier Diode

Switching Diodes

Zener Diodes

General Purpose Diodes

Bridge Rectifiers

Trigger Diodes