1. BA3404F-E2 Substitution Conclusion The BA3404F-E2 offers superior slew rate (1.2 V/µs) and gain-bandwidth product (1.2 MHz) compared to the original LM158WDT (0.6 V/µs and 1.1 MHz), making it potentially better suited for high-speed signal processing. However, its push-pull output structure may not be compatible with the unspecified output type of the original part, leading to differences in drive characteristics such as output swing or load capability. Its higher input bias current (70 nA vs. 20 nA) reduces input impedance and DC accuracy, while the larger supply current (2 mA vs. 700 µA) significantly increases power dissipation. The lower output current (30 mA vs. 40 mA) limits drive capability for heavier loads. Although the supply voltage range is wider (4 V to 36 V), the higher minimum voltage may not be suitable for the original 3 V low-voltage system. The package width (4.40 mm vs. 3.90 mm) could also cause PCB layout mismatch. Most critically, the device lacks AEC-Q100 automotive qualification, making it unsuitable for automotive reliability requirements. Substitution may only be considered in non-automotive applications with a supply voltage ≥4 V where higher power consumption and slightly reduced drive capability are acceptable, but output compatibility and thermal design must be carefully validated.