The RS3221-3.3YF5 is a Linear Voltage Regulator (LDO) SOT-23-5 form factor manufactured by RUNIC. It is a three-terminal, RoHS compliant, ultra low dropout regulator designed to provide 3.3V output with a wide input voltage range of 2.7V to 5.5V. It features current limiting, thermal shutdown and reverse battery protection, making it ideal for applications where cost and space are limited. Additionally, it has an output current capacity of 300mA, allowing it to supply power to small digital loads. The RS3221 is designed and tested to comply with IEC60950 and IEC61010 safety requirements, making it suitable for industrial, electromechanical and consumer applications.