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Resistor for a green LED on 3.3 volts
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56 Ω
resistor for a green LED on 3.3 V at 20 mA (calculated 55 Ω)
Green LED on 3.3 V by current
| LED current | Exact resistor | Standard value |
|---|---|---|
| 5 mA | 220 Ω | 220 Ω |
| 10 mA | 110 Ω | 110 Ω |
| 15 mA | 73 Ω | 75 Ω |
| 20 mA | 55 Ω | 56 Ω |
Assumes 2.2 V forward voltage; check your LED datasheet. One LED per resistor; for several LEDs in series subtract each forward voltage from the supply.
Other LED colors on 3.3 V
FAQ
What resistor for a green LED on 3.3V?
For a green LED (about 2.2 V forward voltage) at 20 mA on 3.3 V: R = (3.3 − 2.2) ÷ 0.020 = 55 Ω. The next standard value is 56 Ω, which gives 19.6 mA.
What resistor is safe for an Arduino or breadboard with a green LED on 3.3V?
A 110 Ω resistor limits the current to about 10 mA - dimmer but safe and long-lived. Use 56 Ω for full brightness.
What power rating does the resistor need?
At 19.6 mA it dissipates about 22 mW, so a 1/4 W resistor is enough.
LED resistor calculator · all supply voltages · Ohm’s law
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