1. AD8662ARZ-REEL Substitution Conclusion Based on a comparison of key technical parameters, the AD8662ARZ-REEL outperforms the original part LMC662AIM/NOPB in most critical specifications. However, its input bias current is two orders of magnitude higher, meaning substitution feasibility is highly dependent on the specific application circuit. The AD8662 offers significant advantages in gain bandwidth product (4 MHz vs. 1.4 MHz), slew rate (3.5 V/µs vs. 1.1 V/µs), output drive capability (140 mA vs. 40 mA), and input offset voltage (50 µV vs. 1 mV), delivering superior speed, precision, and load-driving performance. Its higher input bias current (0.3 pA vs. 0.002 pA) may introduce unacceptable error or drift in circuits requiring extremely high input impedance and low leakage current, such as photodiode transimpedance amplifiers or high-impedance sensor interfaces. Its quiescent current is also slightly higher. For applications where input bias current is not critical—such as general signal buffering, filtering, or ADC driving—and operating voltages are within the 5V to 15.5V range, the AD8662ARZ-REEL represents a viable performance-upgrade substitute.