The MMBT3904 with SOT-23 Bipolar Transistors - BJT ROHS is a surface mount transistor manufactured by Doeshare. It is a Small Outline Transistor (SOT) packaged in a SOT-23 package. This transistor can be used to amplify or switch relatively small electric signals in circuits. It has an NPN base configuration and features a maximum current rating of 200mA, a maximum voltage of 60V, and a voltage drop of 0.7V. It has a high gain amplification of up to 800, making it ideal for digital and analog applications. This transistor also features RoHS (Restriction of Hazardous Substances) compliance, making it environmentally friendly and safer to use in circuits.