how to tell led polarity

  1. DIP LED Polarity of 3mm, 5mm, 10mm LEDs etc...

    There are three ways to tell which side it positive or negative on an led in this fashion:Look at the long leg, that is positiveThere is usually a side or part of the led that is flat, that side is negativeIf you look inside the led you can see the larger side, which is also negative
  2. Polarity Guide of 0402, 0603, 0805, 1206 and most all smd leds

    This guide will tell you how to tell the polarity (positive/anode and negative/cathode) of leds. Most often if you can not see any of these markings, a small notch or dot will indicate the negative side of an led. This also goes for markings on a board too.

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