Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Equivalent series inductance (nH)

Equivalent series inductance of the capacitor.

Capacitance (nF)

Capacitance of the capacitor.

Compute the self-resonant frequency of a capacitor from its equivalent series inductance and capacitance. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Self-resonant frequency (MHz)

Frequency where the capacitor resonates with its ESL.

• Capacitance, ESR, leakage, ripple rating, lifetime, and self-resonance vary with frequency, temperature, DC bias, aging, dielectric, package, and mounting. Nominal capacitance alone does not determine in-circuit impedance or reliability.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Decap Resonance

  Compute the resonant frequency in megahertz of a decoupling capacitor from its mounted series inductance in nanohenries and capacitance in nanofarads.

• Inductor SRF

  Compute the self-resonant frequency of an inductor from its inductance and parasitic winding capacitance.

• ESR From Dissipation Factor

  Compute equivalent series resistance as dissipation factor / (2 x PI x frequency x capacitance).