Comments on: Zener Diode Color Coding

By: Ahmed

Ahmed — Sat, 30 Aug 2025 16:30:37 +0000

i have a faulty power supply of delta DPSN-150BP in auxiliary winding it has a zener diode colour code black blue and green the diode is open circuit and and dont know how to find out its value. any one can help me ?

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By: Danish

Danish — Tue, 28 Jun 2022 02:33:46 +0000

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

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By: junk

junk — Wed, 27 Oct 2021 04:06:51 +0000

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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By: David koon

David koon — Sun, 02 May 2021 02:53:05 +0000

In reply to beh.

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

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By: John gumbie

John gumbie — Mon, 05 Feb 2018 08:57:22 +0000

In reply to beh.

Yes its a panasobic tv what size is the diode

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By: Moses

Moses — Thu, 28 Dec 2017 10:40:03 +0000

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

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By: Moses

Moses — Thu, 28 Dec 2017 10:36:33 +0000

In reply to admin.

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?

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By: sanjay upadhyay

sanjay upadhyay — Sat, 23 Dec 2017 17:05:16 +0000

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.

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By: Jestine Yong

Jestine Yong — Wed, 19 Jul 2017 05:51:50 +0000

In reply to Amir Abbas.

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

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By: Jestine Yong

Jestine Yong — Wed, 19 Jul 2017 05:48:03 +0000

In reply to Idorenyin Inyang.

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

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