1. BU7266F-E2 Substitution Conclusion Direct substitution is not viable. Although both are dual-channel, rail-to-rail output amplifiers with partially overlapping supply voltage ranges, their core performance differs by orders of magnitude, making them suited for entirely different applications. The BU7266F-E2 is an ultra-low-power CMOS amplifier. Its gain-bandwidth product (4 kHz) and slew rate (0.0024 V/µs) are hundreds of times lower than those of the LMV358 (1 MHz, 1 V/µs). It can only process DC or extremely low-frequency signals and is completely unsuitable for applications requiring any meaningful bandwidth, such as audio or sensor signal conditioning. Furthermore, its output drive capability (4 mA) is only one-tenth that of the LMV358 (40 mA), rendering it incapable of driving heavier loads. Its substitution value lies solely in battery-powered, high-impedance sensing DC applications with extreme requirements for input bias current (1 pA vs. 15 nA) and quiescent current (0.7 µA vs. 420 µA per dual channel).