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TO-220 pinout standard?

Discussion in 'Electronic Basics' started by [email protected], Jul 2, 2008.

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  1. Guest

    Is it standard that a TO-220 transistor package is, with the tab up,
    with the markings facing you, Base, Collector, Emitter? (for example,
    on the TIP31A)

    I noticed the TO-92 2N3904 I have is (with the markings facing me) E B
    C, and a TO-92 2N2222 data sheet even shows C B E !!!

  2. Guest

    So does this mean it is NOT standard that a TO-220 *transistor*
    package is BCE? (with the markings facing you)

  3. Guest


  4. neon


    Oct 21, 2006
    2N3904 is in a TO18 casing
  5. Eeyore

    Eeyore Guest

    For pcb layout ? I like to make the central pin 0.1" ? Forward of the
    other two. When unheatsunk it also gives greater mechanical stability.

    It gives greater pad clearance too.

  6. Eeyore

    Eeyore Guest

    BCE to me, then which way are you looking at it ? READ THE DATASHEET.

  7. Eeyore

    Eeyore Guest

    Like FETS !

  8. Eeyore

    Eeyore Guest

    It's the bulk of the die substrate.

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