9/9 - LED Resistance Calculations

1. LED INGAN GRN/BLU WTR CLR 1210
V Supply: 5
Forward V:  3.2
I: 20mA = . 02 A

R = (V - Vf) / I
R = (5 - 3.2)/ .02 = 90 ohms

2. LED CHIPLED GRN/BLUE DIFF 0603
V Supply: 5
Forward V:  3.4
I: 20mA = . 02 A

R = (V - Vf) / I
R = (5 - 3.4)/ .02 = 80 ohms

3. LED BL/GRN/ORG DIFF 1.6X1.6 SMD (Calculated Orange)
V Supply: 5
Forward V: 2.1
I: 15mA = . 015 A

R = (V - Vf) / I
R = (5 - 2.1)/ .015 = 193 ohms

4. LED BL/GRN/ORG DIFF 1.6X1.6 SMD (Calculated Blue)
V Supply: 5
Forward V: 3.2
I: 10mA = . 010 A

R = (V - Vf) / I
R = (5 - 3.2)/ .01 = 180 ohms

5. LED RED GAN BLUE 4-PLCC SMD
V Supply: 5
Forward V: 4
I: 20mA = . 02 A

R = (V - Vf) / I
R = (5 - 4)/ .02 = 50 ohms