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.

Noninverting Input Current (A) (A)

Required number input.

Inverting Input Current (A) (A)

Required number input.

Calculate average op-amp input bias-current magnitude as half the sum of the magnitudes of the two input currents. 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]

Input Bias Current (A) (A)

The resulting input bias current (a) returned as a number.

• Compact electronics formulas omit some combination of tolerances, temperature drift, bandwidth, loading, parasitics, noise spectrum, nonlinearity, clipping, calibration, layout, and device-specific limits. Typical datasheet values are not guaranteed limits.
• 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.

• Opamp Input Offset Current

  Calculate op-amp input offset current as the absolute difference between the two input bias currents, using signed current measurements.

• Op-Amp Open-Loop Gain

  Calculate open-loop voltage gain A=Vout/(V+−V−) from an unsaturated operating-point measurement. Differential input cannot be zero; this scalar does not capture frequency-dependent gain.

• Opamp Short Circuit Power

  Estimate output-stage dissipation during an op-amp short to ground as supply-to-short voltage magnitude times the measured short-circuit current; this is not total device power.