1. OPA4364AIDRG4 Substitution Conclusion The OPA4364AIDRG4 is generally compatible with the AD8609ARZ-REEL in terms of package (14-SOIC) and supply range (1.8V to 5.5V), making it a potential substitute. However, several key performance differences must be considered. The OPA4364 offers significantly higher slew rate (5V/µs vs. 0.1V/µs) and gain bandwidth product (7 MHz vs. 400 kHz), which provides superior performance in high‑speed signal processing applications such as audio or data acquisition. On the other hand, its higher input offset voltage (1 mV vs. 12 µV) and higher quiescent current (1.1mA per channel vs. 40µA per channel) will degrade DC accuracy—making it unsuitable for precision measurement circuits—and increase power consumption, which may impact battery‑operated systems. Additionally, its slightly higher input bias current (1 pA vs. 0.2 pA) could introduce minor errors in high‑impedance sensor interfaces, while its stronger output current capability (85 mA vs. 70 mA) is beneficial for driving heavier loads. Feasibility of substitution depends entirely on the application: if the system prioritizes high‑speed response and can tolerate higher power and lower DC precision, the OPA4364 can be used; if the original design relies on low power and high accuracy—such as in sensor amplification or portable devices—the substitution is likely not appropriate.