The HT7550-1 is a linear voltage regulator (LDO) manufactured by TWGMC. It is encased in an SOT-89 package, which is a plastic 3-pin surface mount package small in size, ideal for applications that require a high level of thermal efficiency. It offers a 150 mA output current, a wide input voltage range of 3V to 18V, and an adjustable output voltage range of 0.8V to 16V with a maximum voltage tolerance of ±2%. The device also features high ripple rejection, low dropout voltage, capacitor-free operation, low temperature coefficient, and reverse current protection. It is RoHS compliant, meaning it meets the standards of the European Union's Restriction of Hazardous Substances Directive.