1. XC6217C25A7R-G Substitution Conclusion This is a viable and performance-upgraded direct replacement. The XC6217C25A7R-G comprehensively outperforms the original XC6501C25A7R-G in key parameters: Its quiescent current (Iq) is reduced from 19µA to 8µA, significantly lowering power consumption under light-load or standby conditions, which is beneficial for extending battery life. The dropout voltage is greatly improved from 0.38V@200mA to approximately 0.17V@100mA (extrapolated performance at 200mA remains far superior to the original), enabling stable output at lower input voltages and thereby enhancing power efficiency and application flexibility. Furthermore, the power supply rejection ratio (PSRR) is increased from 50dB to 70dB, providing more effective filtering of input power supply noise and delivering a cleaner supply for noise-sensitive circuits. Both devices share the same package (4-XDFN) and pinout. Therefore, in upgrade scenarios targeting lower power consumption, higher efficiency, or improved noise performance, this part can be used as a drop-in replacement.