1. XC6220A151MR-G Substitution Conclusion Based on a complete match in all key performance parameters—including input/output voltage, output current, dropout voltage, PSRR, package, and protection features—the XC6220A151MR-G can serve as a direct replacement for the original part. The primary differences are a reduction in quiescent current (Iq) from 24.25µA to 18µA, along with a decrease in maximum supply current from 114.25µA to 108µA. This substitution will result in a slight reduction in system standby power consumption, which is beneficial for extending battery life in portable devices. However, it should be noted that the suffix letters (A/D) in this series typically indicate differences in internal compensation networks or stability design. It is recommended to verify in the actual circuit whether the load transient response and output noise still meet the original design margins, especially in applications sensitive to dynamic load variations.