1. AD823AARZ-R7 Substitution Conclusion Based on a comparison of core performance parameters, the AD823AARZ-R7 cannot directly substitute the LT1881ACS8TRPBF, as the two exhibit significant differences in key characteristics. The AD823AARZ-R7, being a JFET-input amplifier, offers high bandwidth (10 MHz vs. 850 kHz) and high slew rate (35 V/µs vs. 0.4 V/µs), making it suitable for high-speed signal processing. However, its input offset voltage (800 µV) is substantially higher than the LT1881’s 25 µV, resulting in inferior DC accuracy. Moreover, its quiescent current (6.3 mA per channel) is over seven times that of the LT1881 (850 µA per channel), leading to significantly increased power consumption. If the original design relies on the LT1881’s low offset voltage and low-power characteristics—such as in high-precision sensor amplification or low-power instrumentation circuits—substitution would severely degrade system accuracy and energy efficiency. The AD823AARZ-R7 may only be considered in high-speed applications where bandwidth and slew rate are critical and where compromises in precision and power are acceptable. Even in such cases, circuit stability and power supply design must be thoroughly re-evaluated.