Don't Miss
Zener Diode Color Coding
By Jestine Yong on August 5, 2011
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.
Likes
(41)Dislikes
(26)
(41)Dislikes(26)
40 Comments
Leave a Reply
beh
August 5, 2011 at 6:21 pm
HI MR YONG
this type of color coding is used just for panasonic zener diods?
beh
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
Amir Mukhtar
August 7, 2011 at 2:20 am
Sir,
NIce Share about the color coding of zener diode.
thanks you
Amir mukhtar
admin
August 8, 2011 at 2:54 am
HI Beh,
It can used on other type of board.
Jestine
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!
admin
August 12, 2011 at 6:25 am
Hi,
At current moment i have only see it in the zener diode. For other diode they would use numbering.
Jestine
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?
mahdi
October 4, 2011 at 2:52 pm
hello!
very very thanks for this important case notice.
i am from iran.
and i repair electronic instrument with internet study!!
goodbye!!
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?
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.
Jestine
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.
Jestine
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 http://www.noahtechelectronicstraining.com
Jestine
Joseph
July 5, 2012 at 3:32 am
dear jasine,
would you plz help me find the trad number of these two diodes:
http://www.4shared.com/photo/M-2by2ep/d2_online.html
http://www.4shared.com/photo/VZ4h9wwy/d1_online.html
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.
Jestine
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,
Vahid
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.
Jestine
pramod m. pakhare
September 8, 2012 at 1:25 am
hello jestine sir
thanks for nice tip
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.
Jestine
bhabha khatri
January 3, 2013 at 4:24 am
thanks 4 helps
Nadia Zidan
August 5, 2013 at 11:47 pm
what is the voltage of a wide brown stripe on a diode zener?
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?
Jestine
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.
Jestine
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 .
Jestine
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?
Jestine
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.
Jestine
Amir Abbas
July 15, 2017 at 6:22 pm
hi jestine
i have a diode with 2 color band. green and yellow..green is near to end which means its cathode i guess..thats it..no 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.
Jestine
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.
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?
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.
Danish
June 28, 2022 at 10:33 am
I have a faulty zener diode and I can't find the voltage value of it because it's only have color coding
Can u tell me how to find it's value. And how to find schematic diagram of any circuit