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.

Quantum Efficiency Fraction

Required number input.

Wavelength Nanometers (nm)

Required number input.

Ideal photodetector responsivity from external quantum efficiency and incident wavelength. 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]

Responsivity Amperes Per Watt (A/W)

The resulting responsivity amperes per watt returned as a number.

• Photodetector responsivity, detectivity, quantum efficiency, and noise-equivalent power depend on wavelength, bandwidth, area, bias, temperature, optical coupling, and the stated noise model. Datasheet conditions must match the intended measurement.
• 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.

• Detector Quantum Efficiency

  Photon-to-electron quantum efficiency from counted collected electrons and incident photons.

• Photodiode Responsivity (Electronics)

  Compute photodiode responsivity in A/W from quantum efficiency and wavelength.

• Detector Noise Equivalent Power

  Detector noise-equivalent optical power for 1 Hz bandwidth from input-referred current-noise density and responsivity.