1. AD8602ARZ-REEL Substitution Conclusion Direct substitution is not recommended. Conditional replacement may only be considered in specific high-speed applications where ultra-low power consumption and extremely low bandwidth are not critical, and the system voltage is ≥2.7V. The AD8602ARZ-REEL differs significantly from the original part, RE46C312S8F, in key performance parameters. Its slew rate (6V/µs) and gain-bandwidth product (8.4 MHz) are three orders of magnitude higher than those of the original (0.003V/µs, 10 kHz). While this makes it excellent for processing high-speed signals or applications requiring high bandwidth, using it in a circuit originally designed for ultra-low-speed operation can easily induce stability issues and oscillation. Furthermore, its quiescent current (750µA per channel) is approximately 1250 times greater than the original's 600nA per channel, which is unacceptable for battery-powered or ultra-low-power systems relying on nanoamp-level operation. Additionally, its minimum operating voltage is 2.7V, higher than the original's 1.8V, limiting its use in low-voltage systems. The only positive improvement is its extremely low input offset voltage (80µV), which is far superior to the original's 3mV and can help improve DC accuracy.