1. XC6501A25A7R-G Substitution Conclusion Based on parameter comparison, the XC6501A25A7R-G can replace the original XC6217A25A7R-G, but this constitutes a performance‑downgrade substitution and requires careful evaluation. The two devices are pin‑compatible and share the same output voltage and maximum current rating. However, key differences exist: the XC6501A exhibits a higher dropout voltage (0.38 V at 200 mA vs. 0.17 V at 100 mA), a larger quiescent current (19 µA vs. 8 µA), and lower PSRR (50 dB vs. 70 dB). Under the same load, the substitute requires a higher input voltage to operate properly, which increases standby power consumption in battery‑powered applications. Moreover, its significantly reduced power‑supply noise rejection may impair stability in noise‑sensitive circuits such as analog or RF sections. Substitution is acceptable if the application does not demand low dropout, low power consumption, or high supply purity, and sufficient input voltage headroom is available; otherwise, it is not recommended.