Need help identifying SCR

Discussion in 'General Electronics Chat' started by BSomer, Feb 29, 2012.

  1. BSomer

    Thread Starter Member

    Dec 28, 2011
    433
    106
    Okay. So I have a couple of these SCR's on a board and one is shorted. Been trying to find any info I can on this, but am coming up short. I would appreciate it if any of you wonderful people here can help. I assume that the AEG is the brand, however, I cannot find anything on that.

    As seen in the pictures the labeling is as follows:
    top line: AEG 2687
    next line: T 9.5
    next line: N6 FOC
    last line: H1 H2 G
     
  2. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    The Motorola 2N 2687 thyristor has the following

    Max repetitive voltage 30 volts

    Max rms on state current 6 amps

    DC gate trigger 1 volt at 0.2 amps

    Holding current 2 milliamps

    However it is referred to as a TO18 package.

    This may or may not be the same baby, what is your application?
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    I think the 2687 is the production date, week 26 of 1987.

    Bertus
     
  4. hwy101

    Active Member

    May 23, 2009
    91
    28
    that looks more like a triac to me, note the "H1 H2 G" pin markings
     
  5. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    Yeh, the H2 is also connected to the mounting tab, as the pin is cut.

    Bertus
     
  6. BSomer

    Thread Starter Member

    Dec 28, 2011
    433
    106
    Yes, I had figured that the 2687 was the date code after doing a little more research. I also found the attached pdf which if I am to trust it I would think that the part # may be T9.5N6 or similar. Then folowing the listing it may be a 9.5A 600V SCR. Though this is still questionable as I did some searches and could not find anything of those ratings in a TO-220 package. Then comes the question of what the gate drive voltage should be.

    As to the application... Well it is a circuit board that I have at work for repair. The customer sent it in with no description of problems or symptoms (typical situation). I really don't know what it is supposed to be used for. The silk screen just has some german words on it and a few numbers, which I presume is the part # and serial #.
     
    • SCR.pdf
      File size:
      206.9 KB
      Views:
      167
  7. BSomer

    Thread Starter Member

    Dec 28, 2011
    433
    106
    yup. The tab is connected to a trace on the back side of the board through the mounting screw.
     
  8. BSomer

    Thread Starter Member

    Dec 28, 2011
    433
    106
    Couple more pics for your pleasure..

    I think the name on it is German, not certain because I never studied any foreign languages.
     
  9. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    gerate type = part number

    Sorry can't do the umlaut.

    Yes, I was dubious about my Moto offer earlier.
     
  10. hwy101

    Active Member

    May 23, 2009
    91
    28
    Gerätetype = Device type
     
  11. Ali Baba

    New Member

    Apr 24, 2011
    6
    0
    the circuit board clearly mentions the left hand side terminal is cathode=K
    and the right hand terminal is marked gate=G
    so its a SCR all right
    the middle terminal is the anode=A
    try any 12 amps 600 volt SCR like the TYN612 from ST electronics
    as a replacement in TO-220AB package
     
  12. BSomer

    Thread Starter Member

    Dec 28, 2011
    433
    106
    Thank you all for your input. I was finally able to contact my boss who is in Detroit about it, he is sometimes hard to get on the phone. He figured to go with an SCR like what Ali Baba had suggested.

    I tell you sometimes this job can be frustrating in finding any information on the repairs I do. Then there are other times where there is an abundance of info, including schematics with reference numbers and such for testing the device being repaired. The joys are endless. :)

    --Brian
     
Loading...