LED Series R V 2
LED Series Resistor Calculator
Calculate the required resistor to protect your LED based on the supply voltage, LED forward voltage, and current.
Formula: R = (Vsupply − Vled) / Iled
Common LED Forward Voltage Drops
| LED Color | Typical Forward Voltage (V) |
|---|---|
| Red | 1.8 – 2.2 V |
| Green | 2.0 – 3.0 V |
| Blue | 3.0 – 3.5 V |
| White | 3.0 – 3.5 V |
| Yellow | 2.0 – 2.2 V |
| Infrared (IR) | 1.2 – 1.5 V |
| UV | 3.0 – 4.0 V |
