1. LMV321LICT Substitution Conclusion From the perspective of pinout and basic power supply compatibility, the LMV321LICT can physically replace the LMV861MG/NOPB. However, there is a significant gap in their core performance specifications, making this a downgrade substitution. It is only suitable for low-frequency, static applications with minimal performance requirements and high sensitivity to power consumption. The primary differences are as follows: First, bandwidth and slew rate are drastically reduced (GBW drops from 31MHz to 1.3MHz, SR from 20V/µs to 0.7V/µs). The LMV321LICT is completely incapable of handling high-frequency or fast-changing signals and is only suitable for low-frequency or DC applications below the audio range. Second, input characteristics are substantially weaker (input bias current increases from 0.1pA to 27nA, offset voltage from 273µV to 1mV). This renders it unsuitable for circuits with high-impedance signal sources, precision measurement, or those requiring high DC accuracy. Third, quiescent power consumption is significantly lower (supply current drops from 2.47mA to 130µA), which is its core advantage. However, output drive capability is also halved (from 150mA to 70mA). Substitution should only be considered in simple signal conditioning or switch control circuits where micropower operation is essential, and where speed and precision are not required.