Crystal Load Capacitor Calculator
Calculate crystal oscillator load capacitors C1 and C2, account for stray capacitance, and find standard capacitor values for your PCB design.
Read the complete design guide →Input parameters
Cstray is the total equivalent stray capacitance seen by the crystal, including PCB and pin effects. Do not add them again.
Frequency is informative and does not change this capacitance calculation.
Calculated results
- Theoretical external capacitors
E12
- Nearest standard value (C1 = C2)
- 18 pF
- Effective load capacitance
- 12 pF
- Difference from nominal CL
- -0.5 pF (-4 %)
E24
- Nearest standard value (C1 = C2)
- 18 pF
- Effective load capacitance
- 12 pF
- Difference from nominal CL
- -0.5 pF (-4 %)
Design estimates only. Matching CL does not guarantee oscillator startup or stability. Check ESR, negative resistance, drive level and tolerances.