Introduction: IDENTIFY THE ANODE/CATHODE of LED's

IDENTIFY THE ANODE/CATHODE of LED's



While referring to any schematic involving led's we sometimes get confused with the identification of the terminals. So for identification , led’s comes with a unique way to identify its terminals as Anode or Cathode. Sometime the diode symbol creates confusion too.Identifing a LED's the cathode and anode of a led is very easy by looking inside.
LED's or Light Emitting Diode's don’t come with any labeling on it to identify Cathode(-ve,GND) or Anode(+ve).

I hope the figure below can solve this problem of identification.


Notice the picture carefully and compare it with the LED diode symbol, that should tell which one is –ve and +ve terminal. As they have to be crystall clear to glow so they don’t have any labeling on it , so the only way to know is either to test it with a multimeter or by carefully observing inside the led . The larger end inside the led is -ve and the shorter one is +ve, that is how we find out the polarity of a LED






Save this picture for reference.


NOTE: I took this picture myself from my camera , Please Do not mind for image clarity ,so i have put some labellings also .



THANKS FOR READING

RON

Rakesh Mondal



www.rakeshmondal.info

CATHODE AND ANODE OF LED



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Comments

author
xman2 (author)2012-03-29

Thanks for the info

author
darrenah (author)2016-05-10

with new LED's you can tell by the legs; the longer leg is the Anode. Also, on some LED's the "bent" leg is the Anode. "Bent" means they put an angle in the leg near the top.

LED Bent Leg.jpg
author
dharmar5 (author)2015-09-07

thanq

author
Mosfet510 (author)2014-09-30

Hi, a very helpful instructable for people learning electronics, but it says in the description of led polarity, that the shorter one is +v, and larger -v? Another way to identify them is by the flat side (-) or a notch. Just thought Id mention it.

author
Doc_Cottom (author)2014-03-15

I just learned something.... do not use super glue to hold LEDs in place. It does something to the plastic the LED is made of, and renders it ruined.

author
dannystaple (author)2013-09-03

You could also have mentioned that the cathode has a flat side on many round LED types.

author
kelvinmead (author)2013-07-03

just a shame that you hold the led the wrong way around to the circuit symbol.

this would make this even less confusing!

author

Yeah i did hold the circuit in the either direction, sorry about that , But you see there is also + and - Symbol to make life easy. :) . Plus I don’t THINK its such big issue for me being ashamed of, as you attempt to project here . anyway thanks for an attempt and comment . :) ;-)

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Bio: Hi my name is Rakesh Mondal , my friends call me ron vist my website for more stuffs like my post here . www.rakeshmondal.info
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