A 22 pF ceramic capacitor is most commonly used for:

• Crystal oscillator load capacitors (e.g., with 16 MHz or 8 MHz crystals)

• High-frequency filtering (RF applications)

• Timing circuits and signal coupling in analog designs

• Snubber circuits in switching power supplies

Because most quartz crystals require two matching load capacitors (often between 18–22 pF) to oscillate reliably.
Example:

• For an ATmega328P (Arduino Uno), two 22 pF caps are connected between the XTAL pins and GND, along with the crystal.

• The capacitor can safely handle up to 50 volts DC

• It is commonly used at much lower voltages (e.g., 3.3 V or 5 V)

• Higher voltage rating adds safety margin and better reliability (especially in noisy circuits)

Usually NP0/C0G dielectric for low capacitance values like 22 pF

• Very stable over temperature

• Low drift, minimal aging, and excellent high-frequency performance