BU931

The BU931 is an NPN Darlington transistor from STMicroelectronics, designed for high-voltage, high-current power switching. It features a collector-emitter breakdown voltage of 400V and a continuous collector current rating of 15A, with a power dissipation of 175W. This transistor offers a minimum DC current gain of 300 at 5A collector current and 10V Vce, ensuring efficient current amplification. The collector-emitter saturation voltage is typically 1.8V max at Ib=250mA and Ic=10A, which helps reduce conduction losses. The device operates at a junction temperature up to 200°C, making it suitable for demanding thermal environments. The BU931 is housed in a TO-204AA / TO-3 chassis-mount package, providing robust mounting and efficient heat transfer. This package is commonly used in industrial and automotive power control circuits. With its Darlington configuration, the BU931 provides high current gain, allowing it to be driven by low base currents while controlling large collector currents. It is well-suited for applications such as motor drivers, power inverters, and switching power supplies. The chassis-mount design facilitates heat sink attachment for extended thermal management.