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.

Inductance (µH)

Inductance of the coil.

Parasitic capacitance (pF)

Winding parasitic capacitance.

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

• Inductor calculations depend on core material, air gap, turns, frequency, waveform, temperature, DC bias, copper resistance, skin and proximity effects, fringing, and saturation definition. Small-signal inductance and nominal current rating may not describe switching operation.
• 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.

• Capacitor SRF

  Compute the self-resonant frequency of a capacitor from its equivalent series inductance and capacitance.

• Common-Mode Choke Impedance

  Estimate one winding's series RL impedance magnitude at frequency f as √[R²+(2πfL)²]. Enter the effective common-mode inductance and resistance at the operating point; real choke impedance also includes core loss, capacitance, and self-resonance.

• Decap Resonance

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