About Zener Diode Color Code

By on December 30, 2009



zenerdiodes

Yesterday i got an email about identifying the zener diode color code. So far there is very little information about zener diode color code. If you  come across one, say the color is blue red green then the value is 6.2 volt and the last band green could be a tolerance or just some suffix. The first two color band calculation is similar to the resistor color code. If you come across any zener diode color code information please do comment and I’m sure many of the readers will appreciate it-thanks!

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105 Comments

  1. admin

    September 14, 2011 at 8:24 pm

    HI Anamul,

    It could be a 5.5 volt zener diode with 2 % tolerance.

    Jestine

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    • arnel

      January 5, 2014 at 1:16 pm

      hi justin.
      i have a problem of my zener diode green,green,violet connected to pin no,6 of str w6754 what is the volt bec the zener is already shortd,

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      • Jestine Yong

        January 6, 2014 at 10:36 am

        HI Arnel,

        I can't confimr the value but it can be a 7.5 volt zener diode.

        Jestine

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  2. admin

    September 14, 2011 at 8:26 pm

    HI Umesh,

    Red yellow yellow could be 2.4 volt zener diode. Sorry no info on black red zener diode.

    Jestine

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  3. Clinton Yarbrough

    September 27, 2011 at 2:24 am

    You have made such a positive impact on not only my business, but my confidence as well. I am on my way to becoming a board level repair technician after 25 years...thank you.

    Sincerely and Respectfully
    Clinton Yarbrough
    Certified Computer Services, LLC
    Owner/Technician

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  4. Saman

    September 28, 2011 at 11:51 pm

    smd diode red-green-blue?

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  5. tarek

    October 1, 2011 at 11:49 am

    i have zener orange orange orange gray

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  6. admin

    October 4, 2011 at 3:54 am

    HI Tarek,

    Sorry no info on 4 color bands zener diode. I suggest that you just try out either 3.3 volt or 33 volt.

    Jestine

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  7. admin

    October 4, 2011 at 3:59 am

    HI Saman,

    Or should be Blue green red? Sometimes it is hard to tell. The value can be:

    6.5 volt or 65 volt with 2 % tolerance or

    2.5 volt or 25 volt with 6% tolerance.

    From above it seems that 6.5 volt with 2% tolerance is more acceptable.

    Jestine

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  8. Jeremy

    November 7, 2011 at 7:49 am

    Hello,i too have a Zener diode, SMD orange glass green stripe cathode. What is voltage on this? Thank you much.

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  9. admin

    November 8, 2011 at 12:00 pm

    HI Jeremy,

    Only one stripe?

    Jestine

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  10. vijayakumar

    November 25, 2011 at 11:52 am

    i would like to know about the diodes which are in the market and its importances

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  11. admin

    November 28, 2011 at 5:30 am

    Hi Vijayakumar,

    I suggest that you Google it because it has more specific information. The information here is mainly on repair and not on theory. The most basic function of diode is to convert ac to dc.

    Jestine

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  12. NUSLEH MADARAK

    January 24, 2012 at 10:41 pm

    Hi Jestine. how can i test IC with multimeter digital or analog?

    TQ

    NUSLEH

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  13. admin

    January 25, 2012 at 8:34 am

    Hi Nusleh,

    You can test the supply voltage to IC pin (vcc pin). You need an oscilloscope to fully test a ic waveform output. The voltage regulator that you have studied can be tested with voltmeter. Just check the input and output voltage.

    Jestine

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  14. Marc Bonnier

    March 13, 2012 at 2:02 am

    Hi,

    I`m currently playing with a LOT of zener diode from the stock of electronic parts at my university and I got a lot of zener diode with color bar for identification.

    I manage to understand the system by comparaison! All our parts are identified in box so, I quickly realize that the color code follow the RESISTANCE COLOR CODE but, it doesn`t give the VALUE of the zener voltage but the PART NUMBER!

    Take the resistance code and use the color number and put "1N" in from of the code you found and you got the zener part number!

    Exemple, I got a VIOLET-GREEN-GRAY-BLUE diode. So, the part number is 1N758 and the datasheet is telling me 10.0v. The last color, blue, I have no idea what it's use for. Tolerance I guess. Maybe the amperage supported? Not idea...

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    • Jestine Yong

      March 14, 2012 at 8:51 am

      Hi Marc,

      That was a very good explanation. I guess the last color should be tolerance but then again tolerance usually is not in 6%. It could be some other meaning that could only be understood by the manufacturer.

      Thanks.

      Jestine

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  15. jacco ten cate

    March 15, 2012 at 3:31 am

    hello
    i have a question about a japanese glassdiode it is marked with only two green bands and i think it is not a zener do you have any idea what this can be

    already thanks
    jacco

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    • Jestine Yong

      March 15, 2012 at 10:20 am

      HI Jacco,

      What is the board marking? It could be a 5.5 or 55 volt zener diode. What equipment and which section you found this diode/zener diode?

      Jestine

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  16. Michael Schuetz

    March 26, 2012 at 2:13 pm

    Hi:
    I have a yamaha m50 amp that I blew some zeners in.(full ohm meter defelection hooked up either way).They are reddish orange with translucent center band.I am totally clueless regarding values or a replacement.Any info much appreciated.

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    • Jestine Yong

      March 27, 2012 at 10:18 pm

      HI Michael,

      Just to check if the same part can be found from the same board in another section? If yes then you can compare it. What is the board marking? because a diac also could have the band in the center.

      Jestine

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  17. Michael Schuetz

    March 26, 2012 at 3:54 pm

    Managed to find out the diode in question is a discontinued hitachi W06C... Any suitable replacements available?

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    • Jestine Yong

      March 27, 2012 at 10:16 pm

      HI Michael,

      Do you mean the part number is W06c? Is it a smd diode?

      Jestine

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  18. Michael Schuetz

    March 28, 2012 at 10:09 am

    HI Jestine:
    Yes you are correct.I rechecked the schematic and it isn't a zener.Just a diode (silicone?)Closest replacements I have found so far are nte116 and mur120.Either should provide a suitable replacement.

    thanks
    Mike

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  19. Gayan

    May 8, 2012 at 6:51 am

    i have a panasonic tv ,that tv not working vertical side.threre is a some zener with color code.that color code is orenge ,blue only.pls.what is the value...

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    • Jestine Yong

      May 9, 2012 at 4:51 am

      HI Gayan,

      It can be a 3.6 or 6.3 volt zener diode. Is the zener diode shorted? once the zener diode is removed what is the voltage around the two points of the zener diode?

      Jestine

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  20. eduardo santoscoy

    May 10, 2012 at 1:29 pm

    i want to know  the values of four zener diodes : green,blue,orange.   orange,blue,green.  green,blue,orange.
    orange,blue,green

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    • Jestine Yong

      May 12, 2012 at 12:57 am

      Hi EDUARDO,

      Since we do not have many data about zener diode, you may need to remove zener diode and check it off board and compare with a good one. You mentioned 4 zener diodes codes which is actually only 2 ie: green blue orange and orange blue green. So the color code can be 5.6 volt or 56 volt or 3.6 volt or 36 volt. Before you conclude on which one to use I suggest that you check on the circuit to see roughly what voltage is present in the circuit. If it is about 5 to 6 volt the you can use 5.6 volt as replacement.

      jestine

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  21. kamal insan

    July 19, 2012 at 2:16 am

    thanks

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  22. Mitul

    August 4, 2012 at 3:19 am

    Please let me know about the 1N5349.I have revolving warning Light which is now faulty.This have the diode 1N5349. I want to replace it.

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    • Jestine Yong

      August 4, 2012 at 10:02 pm

      HI Mitul,

      Sorry I don't get your question-do you mean you want to buy this diode or you want the datasheet?

      Jestine

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  23. Elie

    August 4, 2012 at 10:19 pm

    Dear,
    I have smd diode have number 3977 what is the calculation for it

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    • Jestine Yong

      August 7, 2012 at 7:09 am

      HI Eli,

      This is a special coding and usually only the manufacturer knows it. Sorry I do not have info on this diode.

      Jestine

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  24. John

    January 18, 2013 at 9:10 pm

    Hi Jestine,
    Happy New Year 2013.
    Would like to check with you. I have a glass Zener Diode: 1 side of the Lead has a red dot. On the body, there's Brown Band (red dot's side) and then Blue Band. Do you know what's the possible voltage value for this?
    Thanks.

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    • Jestine Yong

      January 19, 2013 at 9:13 pm

      Hi John,

      It is hard to guess because there are so many non standard coding in the market. In your case it could be a 6.1 volt zener diode. You may have to try it out and retest.

      Jestine

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  25. Nadia Zidan

    August 5, 2013 at 10:35 pm

    I have a brown brown diode zener what is its voltage please ?
    Thank you very much

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    • Jestine Yong

      August 6, 2013 at 9:12 am

      Hi Nadia,

      Probably a 11 volt zener diode. sorry no idea about the wide brown stripe zener diode.

      Jestine

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  26. Angel

    September 30, 2013 at 7:34 am

    Hello have the projector Mitsubishi digital no have POWER can you tell mi what is the problem.

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    • Jestine Yong

      October 1, 2013 at 1:33 pm

      HI Angel,

      It can be any problem from bad fuse to shorted semiconductor. One has to open up the unit and troubleshoot it.

      Jestine

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  27. amit

    October 3, 2013 at 4:46 pm

    I have one glass zener diode may be mini melf pakage. It has first ring broad Red second ring Red third ring white or yellow .plz tel me how to idntify. & in there is any chart or document for colour coded diodes

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    • Jestine Yong

      October 4, 2013 at 9:56 am

      HI Amit,

      There is not much info on zener diode coding. Your's could be 22 volt zener diode and it can't be 2.2 because the smallest value in the market that I'd known was 2.4 volt.

      Jestine

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  28. atef

    October 3, 2013 at 8:06 pm

    Hello can you help me please

    I have a diode (MELF) ,has only one color band for cathode ,(blue) only
    this diode is short ,
    I want to Know the type of this diode
    and the value of its voltage in case of Zener diode (its number if possible)so urgent
    thank you

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    • Jestine Yong

      October 4, 2013 at 9:58 am

      HI Atef,

      Sorry not much info on zener diode coding. Could you find another similar diode in the same circuit board? If yes then you test it with your analogue meter to find out the range. This means you have to compare with other similar zener diode.

      Jestine

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  29. ronald ruesta

    December 3, 2013 at 12:13 pm

    hi jestine my name is ronald and i have a problem with this diode the body is black with green band please tell me the part # or sub can i use is for old ampl MAC1900 mcintosh

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    • Jestine Yong

      December 3, 2013 at 6:28 pm

      HI Ronald,

      Sorry no info on such color on diode. If it is a zener diode it could be 5 volt.

      Jestine

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  30. Vinod

    February 14, 2014 at 2:56 am

    Hi Jestine,

    I have an SMD Zener which is shorted, please let me know it's value please.

    Red Blue Green

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    • Jestine Yong

      February 14, 2014 at 2:56 pm

      Hi Vinod,

      It is hard to guess such color code. It can be a 26 volt with 5% tolerance or it can also be 56volt with 2% tolerance. I will take the first one as a choice.

      Jestine

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  31. Matt

    May 15, 2014 at 1:40 am

    I have a suspected bad surface mount diode that is mounted underneath a transformer. It is a small orange glass diode with the black polarity band and a single purple band in the middle. Any idea what it could be? I attempted to test as a zener and got to 70 volts and it still hadn't clamped, however if it is bad I supposed it may not even if it is a zener. Any help is appreciated.

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    • Jestine Yong

      May 15, 2014 at 3:27 pm

      HI MATT,

      What is the board marking? Single color band in the center could be a diac. A diac should have no reading either way when tested with analogue meter set to x 10 K ohm.

      Jestine

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  32. serg

    July 3, 2014 at 9:17 am

    Hi Jestine, would much appreciate for some help. I have zener diode I need to change. If I'm not mistaken I should start reading from cathode: green brown brown. Looks like it is 5.1V zener diode, but if I use method of Marc Bonnier - placing 1N (in front) + 511 (colour numbers) = 1N511 than in data sheet i get different number 6.8V.
    what can happen if I install wrong diode for example if it will differ in V value by 1 or 2
    Thanks in advance

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    • Jestine Yong

      July 3, 2014 at 10:27 pm

      HI Serg,

      It depends on the type of the circuit. Some would not work, some shutdown and etc.

      Jestine

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  33. Chetan Dewangan

    October 17, 2014 at 7:31 pm

    how to identify power and value of minimelf zener diode, because i have two zener diode, one is Blue band and others is black band.

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    • Jestine Yong

      October 18, 2014 at 9:16 am

      HI Chetan,

      You may have to find the manufacturer spec as it is hard to locate such info nowadays. Or to solder it out and test with an analogue meter and see it flicks up to which scale. this you may have to compare with a known good one to determine the exact voltage.

      Jestine

      Jestine

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  34. indrajith

    October 19, 2014 at 8:10 pm

    i have a problem of my zener diode red, green,green, please let me know it's value please

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    • Jestine Yong

      October 20, 2014 at 1:55 pm

      It can be 25 or 2.5 volt. I suggest that you check your circuit first. If the circuit is in power supply most likely is 25 volt with 5 % tolerance. if the circuit is low voltage circuit then it is 2.5 volt with 5% tolerance.

      Jestine

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