Transistor Pinouts  
TO-92   Here's a very common plastic package: the TO-92. Beware, not all parts in the TO-92 package share this pinout. Here are some that do:
NPN: 2N3903, 2N3904, 2N4400, 2N4401, PN2222A
PNP: 2N3905, 2N3906, 2N4402, 2N4403, PN2907A
TO-18   Here's a common metal can called the TO-18. This package can handle more power than the TO-92 above. Here are some parts that share this pinout:
NPN: 2N2222, 2N2222A
PNP: 2N2907, 2N2907A
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