1. ADTL084ARUZ-REEL Substitution Conclusion From a direct drop-in replacement perspective, feasibility is low and limited to specific applications. While the package is compatible, key differences prevent it from being a universal substitute. First, its amplifier type is J-FET, as opposed to the original part's general-purpose standard type. This results in a significantly lower input bias current (2pA vs. 90nA), offering superior performance in high-impedance, low-input-current precision circuits (e.g., photodiode sensors, integrators) but potentially differing stability requirements. Second, its minimum supply voltage is 8V, substantially higher than the original's 3V, making it entirely unsuitable for single-supply, low-voltage systems (e.g., 5V or 3.3V). Furthermore, while it offers higher performance in gain-bandwidth product (5MHz) and slew rate (20V/µs), its output drive capability (27mA) is somewhat weaker. Substitution should only be considered in circuits with a supply voltage ≥8V that specifically require JFET input characteristics; otherwise, a redesign of the power supply and feedback network is necessary.