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Identifying a diode brand

  1. Sep 28, 2015 #1

    Zondrina

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    Hi everyone,

    I'm looking for a metal diode that has a maximum reverse breakdown voltage of about 11.500 V and a turn on voltage of about 0.750 V.

    Below is a plot of the reverse linear IV characteristic where the metal diode is marked by an orange dot.

    Below that is a plot of the forward linear IV characteristic where the metal diode is again marked by an orange dot.

    Reverse IV Curves Linear.PNG

    Diode & BJT IV Curves.PNG

    I suspect the metal diode is some type of 1NXXXX diode, but I am unsure what specific model it is.

    I also remember the diode itself was small and grey with a black strip indicating the cathode.

    If anyone might know what specific model this diode is, I would love to know.

    Thank you.
     
  2. jcsd
  3. Sep 28, 2015 #2

    jim hardy

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  4. Sep 28, 2015 #3

    Svein

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    Then obviously you are looking for a silicon diode / rectifier. Or do you mean a Zener diode? Anyhow, On semiconductor (http://www.onsemi.com/PowerSolutions/home.do) is the successor to Motorola's discretes. I suggest you look there.
     
  5. Sep 28, 2015 #4

    Zondrina

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    I think the diode is a 1N4737 after looking at some data sheets. I'm still not 100% certain which diode it is though, what would you guys think?
     
  6. Sep 28, 2015 #5

    jim hardy

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    would you post a link to the datasheet, or snip&paste ?
     
  7. Sep 28, 2015 #6

    Zondrina

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    Disregard my last post. I think I found a better option:

    Screen Shot 2015-09-28 at 3.02.36 PM.png

    The closest ##V_Z## would be the 1N5927B, G with a ##V_{Z_{min}} = 11.40 V##
     
  8. Sep 28, 2015 #7

    jim hardy

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    Are you trying to identify it, or find a replacement ?

    Datasheets give other clues besides electrical characteristics, and hints for use.

    upload_2015-9-28_17-9-50.png

    http://www.onsemi.com/pub_link/Collateral/1N5913B-D.PDF

    if the one you tested has a metal case it's probably rated a watt or more
    your 1N5927 is a 3 watt as you doubtless noted.

    Be aware of importance of keeping the leads short on such a device that's going to be operated near its rated power

    upload_2015-9-28_17-15-33.png

    old jim
     
  9. Sep 28, 2015 #8

    Baluncore

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    How about a photo of the original diode with dimensions. From that we can identify the package standard and then power rating.
    A replacement zenner diode can then be selected from currently available parts.
     
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