1. AD8005ARZ-REEL Substitution Conclusion Direct substitution is not feasible. Although the package is identical and the supply voltage range is wider, the core distinction lies in the fact that the AD8005 is a current-feedback amplifier (CFA), whereas the LT1722 is a voltage-feedback amplifier (VFA). Their operating principles and external circuit design—particularly the selection of feedback resistors—are fundamentally different. Direct replacement would typically lead to circuit malfunction. Furthermore, the input offset voltage of the AD8005 is two orders of magnitude higher (5 mV vs. 100 µV), resulting in significantly degraded DC accuracy. Its lower output drive current (10 mA vs. 50 mA) also provides weaker capability to drive heavy loads. Although the AD8005 offers advantages in slew rate (280 V/µs) and bandwidth (270 MHz -3dB bandwidth), these could only justify substitution in specific scenarios with extreme speed requirements, and only under the condition of completely redesigning the circuit and accepting inferior DC performance.