The MMBT3904LT1 is a NPN surface-mount Transistor manufactured by LGE that is housed in a SOT-23 package. It is RoHS compliant and designed for use in medium to high power applications such as amplifier, switching and general circuit applications. It is designed to switch quickly and can handle high power up to 500mA and a voltage of up to 40V. It has a current gain of 100 - 300 and a low saturation voltage of 0.3V max. It offers excellent stability, low noise and low power consumption.