1. XC6501C25A7R-G Substitution Conclusion Given pin-to-pin compatibility and identical output voltage and current capability, this device can serve as a replacement for the original part. However, its performance in the target application must be re-evaluated. Key differences are as follows: First, the dropout voltage is higher (0.38V @ 200mA vs. the original part's 0.17V @ 100mA; test conditions differ, but the increase is significant). This raises the minimum input voltage required to maintain regulation, which may reduce effective battery runtime in low-input-voltage or battery-powered applications, or cause premature dropout when input voltage margin is insufficient. Second, the quiescent current is notably lower (19 µA vs. 50 µA), which is highly beneficial for standby power consumption in battery-operated systems. Third, the power supply rejection ratio (PSRR) is lower (50dB vs. 70dB @ 1kHz), indicating weaker filtering of input ripple and noise. This makes it unsuitable for analog or RF circuits demanding high power supply purity. If the application is not sensitive to dropout voltage and noise suppression but has strict power consumption requirements, this part is a viable substitute.