• Why does the input bias current fluctuate due to the effects of temperature and supply voltage?
    • The input bias current will differ for bipolar and CMOS products. The input bias current for bipolar products is determined by the internal current source and base current of the input stage transistor, with hFE affected by temperature and supply voltage, causing a change in the input bias current.
      For CMOS devices, the difference between the outflow and inflow of leakage current of the electrostatic protection element connected between the input pin-VDD and input pin and VSS, respectively, becomes the input bias current, and since this leakage is affected by temperature and supply voltage, the difference will appear in the input bias current as well. Please refer to the technical materials for additional details.
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