The MMBT3904W Bipolar Transistor (BJT) with SOT-323 package is a NPN wide-band silicon device manufactured by TWGMC. It's an RoHS-compliant, low-power transistor with a low current (Ic) of 100mA. It has a voltage rating of 40V and a maximum power dissipation of 625mW. This device features a high gain, low noise, and fast switching making it ideal for a variety of applications, such as amplifiers, oscillators, mixers, and video circuits. The MMBT3904W is also suited for use as a switching element in audio circuits, as well as for other applications.