The MMBT3904LT1G is an NPN bipolar junction transistor (BJT) with general-purpose design manufactured by ON Semiconductor. This device features low current (max 100mA), high current gain (hFE up to 500), and low voltage capability (VCE(sat) max of 1.5V at Ic = 10mA). It is used for switching and signal amplification applications in many consumer and automotive devices. This BJT is designed to operate over a wide temperature range (-55°C to +150°C) and features a fast switching speed (tot < 20ns). Its package is the SOT-23 with lead-free PbF finish.