The BU406B Transistor is a NPN type device manufactured by FeiHong. It is packaged in a TO-220 form factor with RoHS rating, making it compliant with the EU's Directive on Restriction of Hazardous Substances. It is a low-voltage, low-power, high-current device that is suitable for switching and amplification applications. It is optimized for use in consumer electronics, power management, and automotive applications. The maximum power dissipation of this transistor is 2 watts, and it supports a maximum operating temperature of up to +150°C. It also has a voltage range from -20V to +20V, a current gain of 10, and a break-down voltage of 40V. This transistor is able to operate at frequencies up to 100MHz.