1. S-1200B53-M5T1G Substitution Conclusion This device is fully compatible with the original part XC6204B532MR-G in its key specifications (5.3V output voltage, 10V maximum input voltage, 150mA output current, SOT-25-5 package, and enable control function), making it a viable direct replacement. Key differences are as follows: The quiescent current (Iq) is significantly reduced to 1µA (original: 120µA), which substantially lowers power consumption in standby or light-load conditions, particularly beneficial for extending battery life in portable devices. The dropout voltage is improved to 0.19V @ 100mA (original: 0.29V), indicating greater operating margin and higher efficiency when the input voltage is close to the output. The PSRR is specified as 65dB @ 1kHz (original: 70dB @ 10kHz). While the numerical values are comparable, the different test frequencies suggest its high-frequency noise rejection capability may be slightly inferior; this should be evaluated based on the noise sensitivity of the specific application. Additionally, it is necessary to verify that the enable pin logic levels are identical. Any discrepancy may require adjustments to the external circuitry.