Transistor Pinouts 

Transistor pinout (or transistor base diagram) information for the older Qs in TO-3, TO-5, TO-18, TO-92, TO-220, etc. packages that the electronics hobbyist might have in his junk box is not an easy find on the Internet.  So here's some help:

This is an enlarged copy of a little info. sheet that came with some Qs that I bought many years ago from one of the surplus suppliers. 

Links to other pinout information found on the Internet:

    This excellent PDF download of pinout diagrams is from the online book 200 Transistor Circuits 

    Another image of transistor bases similar to the ones above

   This one includes some voltage regulators and the 555 Timer

    A PDF file of transistor base diagrams - This is a download in most browsers

    Pinout information arranged by TO and SOT numbers - Quite comprehensive

    Several charts - Mostly European types by package type 

    Some European and Japanese ones

    A few more - Scroll down a few pages to just before the Contents listing

Finally, if you can get your hands on a Radio Shack Electronic Components Tester - Catalog # 22-330 you will have an excellent little test device that will find the pinout information for transistors, FETs, diodes, SCRs and LEDs and identify whether the device is good or bad.

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