1. XC6501C25A7R-G Substitution Conclusion This device is not recommended as a direct replacement and is only viable under specific conditions. Compared to the original part XC6217D25A7R-G, the key differences are as follows: The quiescent current (Iq) increases from 8 µA to 19 µA, leading to significantly higher power consumption during standby or light-load conditions, which would reduce battery life in portable devices. The dropout voltage is as high as 0.38V at a full load of 200mA, whereas the original part exhibits only 0.17V at 100mA. This means the new device requires a higher input voltage to maintain regulation under the same output current, limiting its use in applications with low input voltage headroom. The power supply rejection ratio (PSRR) drops from 70dB to 50dB, indicating a substantially reduced ability to suppress input ripple and noise. This degradation could compromise performance in circuits sensitive to supply purity, such as analog or RF stages. Direct substitution should be avoided unless the application is insensitive to power consumption, minimum operating voltage, and supply noise.