1. Conclusion on BU7486FVM-TR Substitution The BU7486FVM-TR is not a direct replacement for the OPA2369AIDGKT. There are fundamental differences in their core design objectives and key performance parameters. Forcing a substitution would alter the system's essential performance or cause operational failures. The specific differences and their impacts are as follows: First, speed and bandwidth: The gain-bandwidth product (10 MHz) and slew rate (10 V/µs) of the BU7486FVM-TR are three orders of magnitude higher than those of the original part (12 kHz, 0.005 V/µs). Substituting it would drastically enhance the circuit's high-frequency response, potentially introducing stability issues (such as oscillation) not present in the original design and significantly altering the performance of dynamic circuits like filters and integrators. Second, power consumption: The quiescent current of the BU7486FVM-TR (6 mA) is thousands of times greater than that of the original part (~1.4 µA). This directly negates the core advantage of ultra-low power consumption in the original design. For battery-powered devices, this would lead to a severe reduction in operational lifetime. Third, operating voltage and precision: The minimum operating voltage of the BU7486FVM-TR (3 V) is higher than that of the original part (1.8 V), making it incompatible with low-voltage systems operating between 1.8V and 3V. Furthermore, its input offset voltage (1 mV) is substantially larger than the original's (250 µV), introducing greater error in applications requiring high DC precision. The BU7486FVM-TR may only be considered as a substitute if the application demands extremely high speed, is highly insensitive to power consumption, operates from a supply voltage above 3V, and the circuit is redesigned accordingly.