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.

Motional RMS current (A)

Required number input.

Motional resistance (Ω)

Required number input.

Compute crystal motional-branch dissipation from measured RMS motional current and motional series resistance. 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]

Crystal drive power (W)

The resulting crystal drive power returned as a number.

• Oscillator estimates use nominal component values and simplified resonator models. Load capacitance, parasitics, drive level, startup margin, phase noise, temperature, aging, pulling, and amplifier nonlinearities determine the realized frequency and stability.
• 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.

• Crystal Quality Factor

  Calculate a crystal motional branch's unloaded series Q from series frequency, motional inductance, and series resistance.

• ESR Power Loss

  Compute capacitor ESR power dissipation as RMS ripple current squared times equivalent series resistance.

• Crystal Series Resistance

  Infer crystal motional series resistance from series frequency, motional capacitance, and unloaded series quality factor.