1. AD5247BKSZ10-2RL7 Substitution Conclusion A direct substitution is not recommended due to critical differences that would impact the fundamental circuit functionality. The primary distinctions lie in the configuration (Rheostat vs. Potentiometer) and the supply voltage range (2.7V ~ 5.5V vs. 1.8V ~ 5.5V). The AD5247 can only be configured as a two-terminal variable resistor, unlike the original part which can function as a three-terminal voltage divider. This directly alters its role in the circuit and may prevent the design from operating correctly. Furthermore, its narrower supply voltage range, particularly the elevated minimum of 2.7V, precludes its use in low-voltage systems operating between 1.8V and 2.7V. While it offers superior performance in terms of temperature coefficient (45ppm/°C) and wiper resistance (75Ω), the two aforementioned fundamental discrepancies disqualify it as a universal drop-in replacement. It could only be considered for careful evaluation in specific applications requiring low wiper resistance, where the circuit architecture is purely a variable resistor, and the supply voltage is guaranteed to exceed 2.7V.