1. LM158DT Substitution Conclusion Caution is advised when substituting LM158DT for LM258AMDREPG4. While the LM158DT offers superior performance parameters—including a higher slew rate (0.6 V/µs vs. 0.3 V/µs) and gain bandwidth product (1.1 MHz vs. 700 kHz) for improved high-frequency response and signal processing speed, lower power consumption (700 µA vs. 1 mA per channel supply current), and stronger output drive capability (40 mA vs. 30 mA)—several critical differences exist. The LM158DT features a differential output type, whereas the original device likely employs a single-ended output. This architectural mismatch may lead to incompatibility with the original circuit design. Furthermore, its higher input offset voltage (5 mV vs. 2 mV) can degrade DC accuracy, potentially impacting high-precision applications. The slightly narrower supply voltage range (30V vs. 32V) is generally a minor concern. On the positive side, its automotive-grade AEC-Q100 qualification makes it more suitable for harsh environments. In summary, the LM158DT can serve as a high-performance substitute if the application circuit can accommodate a differential output and does not demand low offset voltage; otherwise, a redesign or avoidance is recommended.