1. AD8061ARZ Substitution Conclusion Based on key parameter comparison, substituting the MCP661T-E/SN with the AD8061ARZ is conditionally feasible and requires careful evaluation of whether the application aligns with the performance differences. The AD8061ARZ offers significant advantages in bandwidth (320MHz vs. 60MHz) and slew rate (650V/µs vs. 32V/µs), making it suitable for high-speed signal processing. However, its input bias current (3.5µA vs. 6pA) is nearly three orders of magnitude higher, which may introduce substantial error in high-impedance sensing or precision DC applications. Additionally, while its supply voltage range (2.7–8V vs. 2.5–5.5V) is wider, the slightly higher lower limit requires attention to low-voltage compatibility. If the system prioritizes high speed and wide dynamic range with low sensitivity to input bias, substitution is viable. If high precision, low power consumption, or ultra-low voltage operation are critical, the original part remains preferable.