The MMBT3906 is a surface-mount transistor produced by Yangjie. It is a PNP bipolar transistor with a 40V maximum collector-emitter voltage, a maximum collector-base voltage of 40V, a maximum emitter-base voltage of 5V, a maximum collector current of 0.2A, a total power dissipation of 300mW, and an SOIC-5 (SOT23) package. It is used in many electronic applications such as amplifiers, switches, and small logic circuits.