Hi, Im pretty new to this so this may be a dumb question. I am building a simple circuit and need a 2N3904 Transistor. In the Mouser catalog they have 2N3904, 2N3904_D10Z, 2N3904_D27ZS00Z, 2N3904_D28Z, 2N3904_J05Z, 2N3904TA, 2N3904TAR, and the list keeps on going. I assume to just order the simple '2N3904' but am curious as to what the others are. Thanks a lot.