1. AD744JRZ-REEL Substitution Conclusion The AD744JRZ-REEL can serve as a viable replacement for the OPA602AU, but several key differences must be considered. The AD744 offers higher bandwidth (13 MHz vs. 6.5 MHz) and slew rate (75 V/µs vs. 35 V/µs), providing superior performance in high-speed signal processing. It also features lower input offset voltage (300 µV vs. 1 mV), which improves DC accuracy. However, the AD744 has higher input bias current (30 pA vs. 2 pA), which may introduce greater error in applications involving high-impedance sensors or precision integrators. Both devices are compatible in supply range (9–36 V vs. 10–36 V) and package, but the AD744 draws slightly higher quiescent current (3.5 mA vs. 3 mA), requiring evaluation of system power budget tolerance. In summary, if the application prioritizes speed and accuracy over input current sensitivity, the AD744 can be regarded as an upgraded substitute.