Triac Orientation

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

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 difference.

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.

to

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

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--- 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.

-- John Fields

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Thanks that clears up my confusion.