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Identifying The Pins

Discussion in 'Electronic Basics' started by Ron Hubbard, Oct 6, 2005.

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  1. Ron Hubbard

    Ron Hubbard Guest

    I bought a SCR from Mouser that didn't have any pin-out. Are all SCRs
    the same in terms of where the gate and the other pins are located or
    do they vary from SCR to SCR?

  2. Noway2

    Noway2 Guest

    Does the part have a datasheet that would show you the pins? Also,
    look on the manufacturer's web site for an additional document such as
    packaging information. I have come across a couple of parts like this,
    where the pin information wasn't clear. If all else fails, call the
    manufacturer tech support. Also, sometimes the pin information is
    contained in very small print on the bottom corner of the last page or
    some equally apparent location.
  3. Ron Hubbard

    Ron Hubbard Guest

    No joy with a datasheet, and nothing in the packaging, but beside one
    pin is A4 and beside the other pin is 43-- any significance?

  4. ehsjr

    ehsjr Guest

    It might help if you posted the Mouser part number.
    We don't even know which package style you've got.

    You can test the thing to find out which pins are which.

    Wire up this circuit:

    +12 ---+---[LED]---[470R]------A
    | __
    +-------[470R]---o o---G

    Gnd --------------------o o---C

    When the SCR is connected Anode to A, Cathode to C, and Gate to G,
    it will behave as an SCR should. You will not hurt it if you
    mis-connect it.
  5. Noway2

    Noway2 Guest

    Unfortunately the designations don't strike any bells with me. I also
    ran this by one of my co-workers who has worked with a lot of different
    SCRs and they didn't seem to mean anything to him either.

    Since you bought it from mouser, do you have the manufacturer and
    manufacturer's part number?
  6. bg

    bg Guest

    Use an ohm meter - with the cathode negative and the gate positive it
    measures like a forward biased diode. All other combinations are infinate.
    Ron Hubbard wrote in message
  7. Ron Hubbard

    Ron Hubbard Guest

    Let's see; the part number is 511- TYN408G and the mfg. P/N isn't much
    different, it's TYN408GRG.

  8. Ron Hubbard

    Ron Hubbard Guest

    Thanks, Ed.

  9. Ron Hubbard

    Ron Hubbard Guest

    It's been so long since I've used a SCR in a project, I forgot about
    that. Thank's for the reminder.

  10. Noway2

    Noway2 Guest

    This part doesn't even show up on the manufacturers site!

    I did locate this link, however.

    It will take you to the datasheet for ST's standard SCRs. I came
    across this when I made the search more generic and found a TYN410.

    It is possible that part of the problem is that the tyn408g has been
    made obsolete.
  11. ehsjr

    ehsjr Guest

  12. Ron Hubbard

    Ron Hubbard Guest

    Thanks for all the help, folks.

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