Decoupling Capacitor Calculator

In industrial and commercial electrical systems, maintaining a stable voltage supply to high-speed ICs is critical for system reliability. This calculator determines the minimum capacitance required to localise energy storage and suppress voltage ripple caused by rapid switching.

Use this tool to:

  • Determine Minimum Capacitance: Calculate the exact capacitance needed to supply instantaneous charge to an IC during switching transients to keep voltage stable.
  • Analyze Power Integrity: Evaluate how your specific Maximum Allowable Ripple (%) and Peak Transient Current impact the required energy reservoir.
  • Establish Target Impedance: Identify the maximum allowable impedance (Z_target) for your Power Distribution Network (PDN) to ensure high-frequency noise suppression.
Input Parameters
Calculated Results
Note: This calculation assumes a 50% duty cycle. For optimal high-frequency decoupling, place capacitors as close to the IC power pins as possible to minimize trace inductance.

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