1. LM258DG4 Substitution Conclusion The LM258DG4 exhibits partial compatibility with the original LM2904WDT in core parameters but presents critical differences that limit its direct substitution. Its lower slew rate (0.3 V/µs vs. 0.6 V/µs) results in slower response to high-speed signals, such as step inputs or high-frequency variations, potentially introducing distortion in higher-frequency applications. The higher input offset voltage (3 mV vs. 2 mV) degrades DC accuracy, which may increase error in precision amplification or sensor signal conditioning circuits. Furthermore, its total quiescent current is higher (approx. 1 mA vs. 700 µA, based on a per-channel spec of 500 µA), leading to increased power consumption, a disadvantage for battery-powered or low-power designs. While the gain bandwidth product (GBP) is identical (1.1 MHz) and the supply voltage range is slightly wider (3-32 V vs. 3-30 V), the aforementioned differences restrict its suitability as a direct drop-in replacement for high-speed, high-precision, or low-power scenarios. Substitution may be cautiously considered only in applications with relaxed speed and accuracy requirements, such as low-frequency signal processing or non-critical control circuits, provided a thorough evaluation of the actual performance impact is conducted.