MMBT5401 is a surface mount NPN transistor in a SOT-23-3 package manufactured by Youtai. It has a maximum power dissipation rating of 500 mW, a collector-emitter breakdown voltage of 40V, a maximum collector current rating of 500 mA, and a hFE range of 300-500. The MMBT5401 is designed for switching and general amplifier applications. It is RoHS (Restriction of Hazardous Substances) compliant and contains no hazardous materials such as lead.