1. XC6501C2717R-G Substitution Conclusion Substitution is feasible but requires awareness of performance degradation. The XC6501C2717R-G is compatible with the original XC6217D2727R-G in fundamental specifications (input/output voltage, output current, package, and enable function). However, three key differences exist: Quiescent Current (Iq): Increases from 8µA to 20µA. This ~1.5x rise in standby power consumption may negatively impact battery life in portable devices. Dropout Voltage: Increases from 0.17V @ 100mA to 0.38V @ 200mA. This indicates a higher minimum input voltage required to maintain regulation under full load or low input conditions, limiting its suitability for low-dropout applications. PSRR: Decreases from 70dB to 50dB (at 1kHz). The significantly reduced power supply ripple rejection can lead to increased output ripple in noise-sensitive circuits. Substitution is acceptable if the application is not stringent on power consumption, dropout voltage, or noise immunity. Otherwise, a re-evaluation is necessary.