1. OPA2345EA/250 Substitution Conclusion The OPA2345EA/250 is compatible with the LTC6081 in core architecture (CMOS, dual, rail-to-rail output) and package. However, critical parametric differences determine that it is not an ideal "cost-down" or "performance upgrade" substitute, but rather an alternative requiring careful evaluation. Its primary advantage is a quiescent current (150µA per channel) approximately 55% lower than the original part (330µA per channel), offering significant benefit for battery-powered equipment. However, its input offset voltage (200µV) is more than double that of the original (90µV), which directly degrades DC precision, making it unsuitable for high-accuracy measurement applications. Furthermore, its output drive capability (15mA) is weaker than the original (24mA), introducing risk of voltage droop or distortion when driving identical loads. Substitution should only be considered in applications where power consumption is extremely critical, and requirements for precision and output current can be relaxed.