1. AD627ARZ-RL Substitution Conclusion Not feasible. The fundamental incompatibility stems from the fact that the AD627ARZ-RL is an instrumentation amplifier, whereas the original part, the ISL28110, is a JFET-input operational amplifier. The AD627ARZ-RL integrates multiple amplifier stages and precision resistors internally to directly amplify differential signals with high common-mode rejection. Its circuit architecture, gain-setting method (typically via a single external resistor), and primary application focus (sensor bridge conditioning, differential signal acquisition) are fundamentally different from those of a general-purpose op-amp. Regarding key specifications, its bandwidth (80 kHz) and slew rate (0.06 V/µs) are extremely low, rendering it completely incapable of handling the mid-to-high frequency or fast-changing signals for which the original part was suitable; the disparity in dynamic performance is vast. Furthermore, its output current capability (25 mA) is comparatively limited. Substitution is only conceivable if the application is strictly for very low-frequency, high-precision differential measurement and the circuit can be completely redesigned from the ground up.