1. BU7486FVM-TR Substitution Conclusion The BU7486FVM-TR has low feasibility as a direct drop-in replacement and is primarily suitable for general-purpose applications with non-critical performance requirements. Its key performance parameters are comprehensively inferior to the original part: the input bias current (1 pA vs. 0.1 pA) is an order of magnitude higher, and the input offset voltage (1 mV vs. 273 µV) is degraded by nearly a factor of four, which would introduce significant error in high-impedance signal source or precision DC amplification applications. Furthermore, its slew rate (10 V/µs) and gain-bandwidth product (10 MHz) are only half to one-third of the original part's, severely limiting signal processing speed and bandwidth. The most critical difference is the output drive current (12 mA vs. 150 mA), which differs by more than an order of magnitude. This makes it entirely incapable of driving heavy loads such as headphones or small motors, constituting the primary obstacle to substitution.