The feasibility of substituting the original TS912IYDT with the ADA4665-2ARZ is limited and highly application-dependent, due to significant differences in their key parameters. The ADA4665-2ARZ offers superior performance in high-precision and low DC-error applications, featuring lower input bias current (0.1 pA vs. 1 pA) and input offset voltage (1 mV vs. 10 mV). It also consumes less power, with a supply current of 290 µA per channel compared to 400 µA, making it advantageous for energy-efficient designs. In contrast, the TS912IYDT supports a wider supply voltage range, down to 2.7 V versus 5 V minimum for the ADA4665-2ARZ, making it more suitable for low-voltage or battery-powered systems. It provides higher output current (75 mA vs. 30 mA) and slightly better dynamic performance, with a slew rate of 1.3 V/µs versus 1 V/µs and a gain bandwidth product of 1.4 MHz versus 1.2 MHz. These characteristics enable it to drive heavier loads and respond more quickly to fast signals. Additionally, the TS912IYDT carries the automotive-grade AEC-Q100 qualification, which the ADA4665-2ARZ does not mention, potentially making the latter unsuitable for harsh automotive electronic environments. Substitution may only be considered if the application does not require low-voltage operation, high output current, or automotive certification, and places greater emphasis on precision and low power consumption. Otherwise, the TS912IYDT should be retained, or an alternative compatible device should be evaluated.