1. Conclusion on BU7266FVM-TR Substitution Not feasible. The BU7266FVM-TR exhibits orders-of-magnitude disadvantages in key technical specifications compared to the original LMV358, failing to meet the basic bandwidth and speed requirements of the original design. Its gain-bandwidth product (4 kHz) is only 1/250 of the original part (1 MHz), and its slew rate (0.0024 V/µs) is less than 1/400 of the original (1 V/µs). This device can only process very low-frequency DC or slowly varying signals; at the operating frequency of the original circuit, it would cause severe output distortion or fail to respond. Although it offers advantages such as ultra-low power consumption (700 nA) and ultra-low input bias current (1 pA), these cannot compensate for its critical shortcomings in dynamic performance. Direct substitution would result in circuit functional failure. 2. Conclusion on BU7486FVM-TR Substitution Feasible under specific conditions, requiring careful evaluation. The BU7486FVM-TR surpasses the original LMV358 in all core performance parameters. Its gain-bandwidth product (10 MHz) and slew rate (10 V/µs) are both ten times those of the LMV358, providing superior high-frequency response and transient performance. The trade-off lies in its quiescent current (6 mA), which is significantly higher than that of the original (~0.42 mA), increasing power consumption by more than an order of magnitude—unacceptable for battery-powered or low-power applications. Additionally, its output drive capability (12 mA) is notably lower than the original (160 mA). If the original circuit drives a relatively low-impedance load, direct substitution could lead to output saturation or distortion. It can only serve as a high-performance upgrade alternative in applications where increased power consumption is not a concern and the load is extremely light (e.g., high-impedance input stages).