BU4927G-TR is a single-transistor NPN monolithic silicon bipolar transistor manufactured by ROHM Semiconductor. It is a low-cost, low-noise, large-current switching transistor suitable for use in a wide variety of applications. The device is housed in a 4-pin package and has a maximum operating frequency of up to 3GHz. It has a current gain of up to 60 and a maximum frequency of up to 3GHz. It also has a breakdown voltage of 40V and collector-emitter saturation voltage of 1.2 V.