1. MCP6241RT-E/OT Substitution Conclusion The feasibility of directly substituting the MCP6241RT-E/OT for the AD8515ARTZ-REEL is low. It may only be considered in a very narrow range of low-speed, ultra-low-power applications where dynamic performance is not critical. The key differences are as follows: The gain-bandwidth product (GBW) drops sharply from 5 MHz to 550 kHz, and the slew rate (SR) is significantly reduced from 2.7 V/µs to 0.3 V/µs. This device cannot handle mid-to-high frequency signals or fast-changing signals present in the original design, leading to severe degradation in system bandwidth and transient response. Furthermore, its input offset voltage increases from 1 mV to 5 mV, which introduces greater DC error and impacts precision. Although its quiescent current (50 µA) is notably lower, benefiting battery-powered systems, the substantial gap in core performance parameters renders it unsuitable for typical applications of the original part, such as general-purpose amplification, filtering, or signal buffering.