1. LM158DT Substitution Conclusion Direct substitution is not feasible. The LM158DT's key dynamic performance parameters — a gain bandwidth product of 1.1 MHz and a slew rate of 0.6 V/µs — are significantly inferior to those of the original part (10 MHz, 4 V/µs). This renders it severely inadequate for applications involving high-frequency signals or requiring fast transient response. Furthermore, its input offset voltage of 5 mV is an order of magnitude higher than the original's 500 µV, which will lead to markedly degraded DC accuracy. Its advantages lie in an extremely low quiescent current (700 µA per channel) and compliance with the automotive-grade AEC-Q100 standard. It is therefore only suitable for specialized scenarios with minimal speed and accuracy requirements but stringent demands for low power consumption or automotive qualification. It cannot serve as a performance-equivalent replacement in general-purpose applications.