1. Substitution Conclusion for XC6210A202PR-G The XC6210A202PR-G can serve as a direct functional replacement for the original XC6210D202PR-G. Both devices share identical core electrical specifications—such as input/output voltage, maximum output current, dropout voltage, PSRR, enable control, and protection features—as well as the same SOT-89-5 package. This ensures full pin compatibility and equivalent basic performance in the vast majority of application circuits. The primary technical difference lies in the quiescent current (Iq): the A version draws 64.5 µA compared to 55 µA for the D version. In battery‑powered systems that spend extended periods in standby or light‑load modes, substituting the A version will result in a slight increase in standby power consumption, which may reduce battery runtime. However, for continuously operating or line‑powered applications, this difference is negligible. The substitution is therefore acceptable in applications not critically sensitive to microamp‑level standby current.