2N3906 Transistor Explained / Description:
2N3906 is a widely used transistor. This is also a famous transistor among hobbyists and students because it has been used in wide variety of electronic hobby and educational projects. The transistor is manufactured to perform general purpose tasks in electronic circuits hence it can be used for any general purpose requirement in electronic circuits that fall in its max specification values. The max collector current of the transistor is 200mA therefore it can be used to drive any load which falls under 200mA or 0.2A. Moreover the max collector dissipation value, DC current gain value also makes it ideal to use in wide variety of simple audio frequency applications.
 
Datasheet