Variable Capacitance Diodes, also known as Varicaps or Varactors, are diodes designed to act as voltage-dependent capacitors. They are commonly used in frequency tuning and modulation applications, such as voltage-controlled oscillators (VCOs) and RF circuits.

These diodes offer precise tuning capabilities and are integral to applications requiring variable frequency controls. Manufacturers like NXP Semiconductors, Skyworks Solutions, and Toshiba provide a wide range of varactors suited for different frequency modulation needs.

Incorporating varactors into your designs allows for agile frequency adjustment and improved performance in communication systems, making them crucial for modern electronics.