The MMBT3904 1AM with SOT-23 Bipolar Transistors - BJT ROHS, manufactured by FOSAN, are small signal NPN transistors in a SOT-23 package. They are designed for switching and general purpose amplifier applications, and feature low voltage, high current capabilities. This small-signal transistor is built using a planar technology. It has a low noise figure, high gain and excellent temperature stability. Due to its small size, this device can be used in a wide range of portable electronic applications including a variety of portable, low-power, and high-power devices.