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Zener Diode Color Coding

By on August 5, 2011

zener diode data

If you look at the photo, you will see a diode (D835) have two color stripes across it-Green and Blue color. Since the label is D (D835) so you may think it is a normal diode but actually it is a zener diode. Some manufacturers when putting the label do not follow the standard coding and this will give a problem to repairer. As a repairer you must be flexible otherwise you may have thought that this is a normal diode.  From the schematic, the part number was MA2560 and further check from the datasheet website-it was proven to be a 56 volt zener diode. You can click on the this link to view the zener diode data in pdf.

zener diode green blue color



  1. beh

    August 5, 2011 at 6:21 pm


    this type of color coding is used just for panasonic zener diods?

    • John gumbie

      February 5, 2018 at 4:57 pm

      Yes its a panasobic tv what size is the diode

    • David koon

      May 2, 2021 at 10:53 am

      I have one that is blue green brown. Are you able to say what kind that is? I have been looking for days now

  2. Amir Mukhtar

    August 7, 2011 at 2:20 am

    NIce Share about the color coding of zener diode.

    thanks you
    Amir mukhtar

  3. admin

    August 8, 2011 at 2:54 am

    HI Beh,

    It can used on other type of board.


  4. Touchscreen Repair

    August 11, 2011 at 2:44 pm

    thanks for the info! Are there any other diodes with the same color coding? That would be interesting to know!

  5. admin

    August 12, 2011 at 6:25 am


    At current moment i have only see it in the zener diode. For other diode they would use numbering.


    • Moses

      December 28, 2017 at 6:36 pm

      Mr. which other zenor diode can I use in place of 1N4752? And what is the meaning of codes 1N4752 relating to volts, impedance and power?

  6. mahdi

    October 4, 2011 at 2:52 pm

    very very thanks for this important case notice.

    i am from iran.

    and i repair electronic instrument with internet study!!


  7. Reynolds

    November 9, 2011 at 11:45 pm

    Sir nice info got one question what if we dont have any schematic on this diode then it very hard to get the datasheet is it ok to replace any kind of zener diode how will I know?

  8. admin

    November 11, 2011 at 1:43 pm

    HI Reynolds,

    If no schematic diagram then it will be hard to locate the exact voltage. You have to try it out on certain zener diode voltages.


  9. Dries

    May 4, 2012 at 6:04 pm

    Thanks for this info, Mr. Yong.
    Enabled me to succesfully do a repair and make my humble contribution in waste prevention 🙂

    • Jestine Yong

      May 4, 2012 at 7:24 pm

      Hi Dries,

      You are welcome.


  10. Ernest ofosu

    June 27, 2012 at 1:46 pm

    Please i need one of your book ...............And i want to join your school.......

    • Jestine Yong

      June 28, 2012 at 5:38 am

      Hi Ernest,

      Which ebook do you want? You can visit my training website for more information


  11. Joseph

    July 5, 2012 at 3:32 am

    dear jasine,
    would you plz help me find the trad number of these two diodes:

    • Jestine Yong

      July 6, 2012 at 7:48 am

      HI Joseph,

      Sorry I do not have such info. Most probably the color code/strip could only be understood by the manufacturer only.


  12. Joseph

    July 10, 2012 at 6:51 am

    Hi Jestine,
    I have no idea what are their manufacturer, Is there any other way to find out their part number?I already studied your article about diodes color coding but i think it need some experience about these manufacturer and thier methods .
    thank you in advanced.
    Truly yours,

    • Jestine Yong

      July 10, 2012 at 7:53 am

      HI Joseph,

      It will be tough to find out the info from the manufacturers. They have standard code for resistors but no standard code for SMD components.


  13. pramod m. pakhare

    September 8, 2012 at 1:25 am

    hello jestine sir
    thanks for nice tip

  14. marvin eyitene shillingford

    September 25, 2012 at 9:09 am

    thank for your zener diode explanation. but i want to ask if a zener diode burnt beyong recognition ,how do you determine the value of the zener diode?

    • Jestine Yong

      September 25, 2012 at 8:27 pm

      Hi Marvin,

      In that case you may need to look for the schematic or same machine for comparison.


  15. bhabha khatri

    January 3, 2013 at 4:24 am

    thanks 4  helps

  16. Nadia Zidan

    August 5, 2013 at 11:47 pm

    what is the voltage of a wide brown stripe on a diode zener?

  17. Sam

    October 25, 2013 at 8:30 pm

    Thanks for the info.For general testing,what current would you suggest for testing zeners. I was using curve tracer when I was working with a manufacturing company. Again Thanks

    • Jestine Yong

      October 25, 2013 at 8:32 pm

      HI Sam,

      I used those small current from the analogue meter. I have Huntron tracker 2000 but I did not use it to test zener diode. What brand of curve tracer you are using?


  18. AGA

    October 4, 2016 at 7:07 pm

    I have a zener diode with no part number markings on the schematic only Red Yellow and Green stripes. How do I find the value/voltage of this diode. I've researched this for days with no luck.
    any ideas?

    • Jestine Yong

      October 5, 2016 at 9:37 am

      Hi Aga,

      Check what is the voltage around that circuit. Red yellow can be 2.4 volt or 24 volt with 5% tolerance.


  19. tirupati

    March 24, 2017 at 1:51 am

    jestin sir I have smg led tv , led streep beside 2 diodes . t3 & cb . pls iwant its value . can u help me sir I 'm from india .my name tirupati rao

    • Jestine Yong

      March 24, 2017 at 4:25 pm

      Hi Tirupati,

      Sorry I do not have this info .


  20. Idorenyin Inyang

    June 23, 2017 at 12:36 pm

    Hello jestine,
    I have a zenar diode with only one yellow band. Pleace, can you tell me its voltage?
    Thank you!

    • Jestine Yong

      June 26, 2017 at 10:42 pm

      Hi Idorenyin,
      Did the component have the marking of ZD? From which section you found this component? Have you checked if other circuit in the same board have this component with yellow band?


      • Idorenyin Inyang

        July 14, 2017 at 8:10 pm

        Yes Sir the component has ZD mark. Its coupled to a relay in the primary section of the circuit board.

        • Jestine Yong

          July 19, 2017 at 1:48 pm

          Hi Idorenyin,
          Have checked for the info but sorry can't find any info for such band. Since I do not have practical assessment to his kind of circuit thus I'm unable to provide an answer.


  21. Amir Abbas

    July 15, 2017 at 6:22 pm

    hi jestine
    i have a diode with 2 color band. green and is near to end which means its cathode i guess..thats more sign or symbol or letter..just 2 color band ... how can i find its voltage or part number?
    thanks in advance

    • Jestine Yong

      July 19, 2017 at 1:51 pm

      Hi Amir,

      Green could be 5 % tolerance. The problem with the zener diode is that there was no standard reference by the manufacturers and left many repair techs in the dark. It could also be 4.5 volt, 45 volt, 5.4 volt or 54 volt but it all depends on the circuit it self. If the surrounding circuit is using low voltage then possible 4.5 or 5.4 volt zener diode and you have to test it out.


  22. sanjay upadhyay

    December 24, 2017 at 1:05 am

    Panasonic is a only company. Which fliped components marking. Like resistor with no color code and zener diode with color code. Like i have one
    Panasonic matsushita resistor R22F 1W
    i can't find it all over internet with same code. and i have same zener diode which showed in this post. i damaged it
    wrongly when checking with multimeter.
    but its acting good i checked it with diode range. not checked in on condition.i tryed to search as name showed in this post. but no luck tryed on finding on aliexpress.tryed on alibaba but no luck.

  23. Moses

    December 28, 2017 at 6:40 pm

    Mr. Yong I got a colour zenor diode grey, red, red can it work in place of zenor 1N4752?

  24. junk

    October 27, 2021 at 12:06 pm

    i realize this article has been posted here for over a decade but maybe i can glean some insight from anyone a little more knowledgeable than myself on this subject...

    i am scavenging parts from an old early 1980's CB radio board. unfortunately i dont have the make or model of the radio, but maybe that info will help someone estimate what type of diode it is im looking at. it is a through-hole orange glass-bodied diode that appears to be a typical silicon variety switching diode, except that instead of a black stripe, it has two light blue stripes that trace around it except for where this is a blue uppercase "H". from this article it would appear that it is a zener diode, and if the color coding is that mentioned here, im assuming it is then a 66 volt zener diode. does this sound like it might be accurate? the CB radio PCB it is from surely didnt require anywhere near that high a voltage, it had the ability to run off of a 9 volt battery.

    anyway, any help is greatly appreciated, so thank you.


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