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Triac Orientation

Discussion in 'Electronic Basics' started by John Fields, Nov 10, 2004.

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  1. John Fields

    John Fields Guest

  2. Stacy

    Stacy Guest

    Im trying to make something with a Triac 2N6343A T0-220

    See Schematic at
    Look for Solid State Relay
    I can only poorly reproduce it in text.
    The shematic shows something like this
    | (x)
    / |
    / | (y)
    / (z)

    1. My question is now do I orient the Triac. eg Which is BCE in relation to
    my xyz.
    2. Are most all To-220 B-C-E and Based on this diagram
  3. Stacy

    Stacy Guest

    Right of course. I was getting confused because some sites list the TO-220
    Package as a triac and then go on to talk about some transistors (I suppose)
    that com in TO-220 package with BCE pins. They dont clearly show the

    So, then is this true .. After studying your pdf.
    The (z) (my diagram below) is the Gate which on a Triac TO220 my part I have
    listed, is the 3erd pin looking at the front the. The other pins it doesnt
    matter how you orient them on the circuit.
  4. John Fields

    John Fields Guest

    I've moved your reply to the bottom, just a convention here.
    Please don't top post.

    Looking at the front of the TO-220 package, it pins out like this:
    | |
    | O |
    | |
    | |
    | | |
    | | |
    M M G
    T T
    1 2

    On your drawing, X corresponds to MT2, Y corresponds to MT1, and Z
    corresponds to the Gate.

    For MT1 and MT2, it matters very much which is which from the point of
    view of triggering the TRIAC, and if you go to page 25 (E1-5) of the
    PDF you'll see what I mean. Also read the application notes for some
    typical circuits that work.
  5. Stacy

    Stacy Guest

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