The bi-colour LED’s datasheet will specify which way round to connect to ensure the correct colour. Others may have both LEDs the same colour and this can be useful in AC applications as it can conduct on both cycles of the mains and eliminates the need for a rectifier. Some are dual-colour so that reversing the current through them changes the colour. The two-pin package can contain a single or two back-to back LEDs.īe aware that bi-colour LEDs are also sold in this package. Generally these are a single LED. Polarity is indicated by the long lead (+ / anode) or the flat on one side of the base (- / cathode). The most common type of LED is the 2-pin, 5 mm, round lens type.
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