2. LMV321IDBVRE4 Substitution Conclusion Direct substitution is not recommended. This part is only suitable for specific scenarios where power consumption and input error are not critical, but stronger output drive is required. While the LMV321 offers the same gain-bandwidth product, a higher slew rate (1V/µs), and a significantly larger output current (160mA) compared to typical micropower op-amps—resulting in faster response and the ability to directly drive larger loads like LEDs—its differences impose major limitations. First, its quiescent current (130µA) is approximately three times that of the original part, a critical flaw in power-sensitive, battery-operated applications. Second, its input bias current (15nA) is four orders of magnitude higher than the original's (1pA). This will generate non-negligible input error voltage in circuits with high-impedance sources, severely degrading DC precision. Third, its higher minimum operating voltage (2.7V) further restricts its use in low-voltage systems.