LED RESISTOR CALCULATOR


Enter any three known values and press "Calculate" to solve for the other

INPUT :

Source Voltage (Vs): volts
Forward Voltage (Vf): volts
Forward Current (If): mAmps


OUTPUT :

Resistor (R): ohms
Power: watts

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Every LED (light emitting diode) has a current that they can safely handle. This calculator will help you determine the value of the resistor to add in series with the LED to limit the current.


NOTE:

Going beyond that maximum current, will damage the LED. Thus, limiting the current through the LED with the use of a series resistor is a common and simple practice. Note that this method is not recommended for high current LEDs, which need a more reliable switching current regulator.


Formula:

To find the Resistor value:


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where, R = Resistor Value, Vs = Source Voltage, Vf = Forward Voltage, If = Forward Current.


To find the Power value:

Power = V f * I f


where, Vf = Forward Voltage, If = Forward Current.


Applications:


1. Most of the processor/FPGA based Evaluation board will have user LED’s having current limiting resistors.

2. In FPGA once if you program the FPGA the done pin will goes high. This can be indicated with LED.


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Disclaimer:

he Hardware design Calculator is provided for quick calculation. While using this site, you agree to have read and accepted our terms of use, cookie and privacy policy. Please double check your result if you are looking for a higher degree of accuracy.






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