The 2SC4131 is a NPN transistor manufactured by SPTECH. It is a high power bipolar transistor with a TO-3PML RoHS package. It is designed for use in high voltage, high frequency applications, and has a maximum Collector-Emitter Voltage of 500V, a Collector-Base Voltage of 500V, and an Emitter-Base Voltage of 6V. It has a Collector Current of 2A, a Transition Frequency of 120MHz, and a Power Dissipation of 7W. It is designed to have a high breakdown voltage and a low noise figure, making it suitable for use in RF power amplifiers, motor control, and other high power applications.