1. AD817ARZ Substitution Conclusion From the perspective of key static parameters (supply voltage, offset voltage, bias current, quiescent current) and package, the AD817ARZ is a pin-compatible direct replacement for the LT1224. There are, however, significant technical differences: the slew rate of the AD817ARZ (350 V/µs) is approximately 12.5% lower than that of the original part (400 V/µs). This results in a slightly slower maximum output voltage transition rate when handling large-amplitude, high-frequency signals (e.g., video pulses), which may impact large-signal bandwidth. Conversely, its gain-bandwidth product (50 MHz) is 5 MHz higher, offering a marginal benefit for small-signal frequency response. For general-purpose amplification and buffering circuits that are not extremely high-speed (large-signal) or have less stringent slew rate requirements, the AD817ARZ is a viable substitute. However, if the application relies on the high slew rate performance of the original part, careful evaluation is necessary to ensure the substituted system's dynamic response still meets specifications.