1. LM258DG4 Substitution Conclusion The LM258DG4 exhibits critical performance limitations as a substitute, primarily in supply voltage, bandwidth, and slew rate. Its maximum operating voltage is only 32V (compared to 44V for the original part), making it incompatible with high-voltage applications. The gain bandwidth product (1.1 MHz) and slew rate (0.3 V/µs) are significantly lower than those of the original part (5.5 MHz, 2.2 V/µs), reducing high-frequency signal processing capability and slowing dynamic response. This may degrade performance in audio or high-speed signal conditioning circuits. Additionally, its input offset voltage (3 mV) is higher than the original part’s 1 mV, which could introduce additional error in precision amplification stages. Although it offers lower input bias current (20 nA) and higher output current (40 mA), the mismatch in core parameters restricts its use to low-voltage, low-frequency, and non-critical precision applications. Direct substitution requires careful evaluation of system voltage and frequency response requirements.