2N3904-5 from Motorola Solutions, Inc.. Find the PDF Datasheet, Specifications and Distributor Information. A 2N3904 has an hFE of between about 25 and 400, depending on the operating conditions. It says so plainly in the data sheet characteristics charts. (The gain of any transistor will vary widely depending on the exact circuit conditions). GENERAL PURPOSE TRANSISTORS datasheet, GENERAL PURPOSE TRANSISTORS pdf, GENERAL PURPOSE TRANSISTORS data sheet, datasheet, data sheet, pdf The 2N3904 is manufactured in a plastic TO-92 case. When looking at the flat side with the leads pointed downward, the three leads emerging from the transistor are, from left to right, the emitter, base, and collector leads. Here is an image showing the pin diagram of the this transistor.