Descriptions of JSMICRO BU406 provided by its distributors.
transistor_type:NPN Collector-emitter breakdown voltage(Vceo):200V collector_current(Ic):4A power(Pd):50W DC Current Gain(hFE@Ic,Vce):90@1A,5V NPN400V4AHigh power transistor,Commonly used in humidifiers etc.