The HT7225 from Holtek is a Low Dropout Regulator (LDO) packaged in an RoHS-compliant SOT-89-3 form factor. It has a 150mA output current and offers superior noise suppression. The input voltage range is 4.5-16V, the output voltages range from 1.8 to 4.1V, and the operating temperature range is -40 to 85°C. It's designed to be used in industrial and communications applications, and it consumes very low power, reducing power consumption, and prolonging battery life. It offers a high level of accuracy, with a maximum line regulation of 0.05%. It also features over current protection, thermal shutdown, and reverse polarity protection, making it a reliable and robust solution.