LED notes

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Typical values for the LED series resistor value at various supply voltages are given in the table below.

Note: you may want to drive the LED at a current less than the max I_forward.

(+)  ---[>|---  ---'\/\/\,---  (-)   

Resistance for one LED at 3V/3.3V/5V/10V power supply:

I_forward(mA) V_forward(mA) R(ohm)@ 3.0V R(ohm)@ 3.3V R(ohm)@ 5V R(ohm)@ 12V
2mA 1.8V 620 750 1.6k 5.1k
2mA 2.1V 470 620 1.5k 5.1k
5mA 1.8V 240 300 680 2.2k
5mA 2.1V 180 240 620 2.0k
10mA 1.8V 120 150 330 1.1k
10mA 2.1V 91 120 300 1.0k
20mA 1.8V 68 75 160 560
20mA 2.1V 47 62 150 510


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