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I have a RL80-UR543 LED 8MM. How much voltage I need if I use a resistor of 100Ohm?

No Namer
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1 Answers1

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Forward Current (If) = 20 mA and

Forward Voltage (Vf) = 1.7V to 2.8V
is written on datasheet

  • maximum voltage = 20mA*100ohm + 2.8V = 4.8V
Koray
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  • I conntect it to a battery without any resistor and nothing happened. Bettery is 1.5v – No Namer Jan 08 '19 at 20:31
  • I calculated theoretical maximum voltage according to your requirements. Using leds without current control not a good way. – Koray Jan 09 '19 at 05:56