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Color coding and sets of resistors

Color coding, resistors SMD coding and sets E6, E12, E24 and E48. These series are standardized and commercialized, common for low power. There are other series like E96 and E192 for more special applications.

Color coding of resistors

Colored bands of the resistor
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Color 1st number 2st number Multiplier Tolerance
Black   0 1  
Brown 1 1 x10 1%
Red 2 2 x102 2%
Orenge 3 3 x103  
Yellow 4 4 x104  
Green 5 5 x105 0.5%
Blue 6 6 x106  
Violet 7 7 x107  
Gray 8 8 x108  
White 9 9 x109  
Gold     x10-1 5%
Silver     x10-2 10%
Uncoloured       20%

Example:
Resistor If the colors are: ( BrownBlackRedGold )
Its value in ohms is: 10x1005%  = 1000omega = 1Komega, tolerance 5%


Resistors 5 colored bands :

In 5-band resistors color, the only difference from the above table, is that the third band corresponds to the 3rd figure, the rest is equall.

SMD resistors encoding

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SMD resistor of 1200 ohms 1st number = Number 1st
2st number = Number 2st
3st number = Multiplier
In this example the resistor has a value of 1200 ohms = 1K2
SMD resistor of 1.6 ohms 1st number = Number 1st
The "R" indicates decimal point
3st number = Number 2st
This example has a value of resistor: 1.6 ohms
SMD resistor of 0.22 ohms The "R" indicates "0."
2st number = Number 2st
3st number = Number 3st
This example has a the resistor value of 0.22 ohms

Sets of resistors, E6 - E12 - E24 - E48, IEC Standard

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E6 1.0 1.5 2.2 3.3 4.7 6.8
E12 1.0 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.8 5.6 6.8 8.2
E24 1.0 1.1 1.2 1.3 1.5 1.6 1.8 2.0 2.2 2.4 2.7 3.0 3.3 3.6 3.9 4.3 4.7 5.1 5.6 6.2 6.8 7.5 8.2 9.1
E48 1.0 1.05 1.10 1.15 1.21 1.27 1.33 1.40 1.47 1.54 1.62 1.69
1.78 1.87 1.96 2.05 2.15 2.26 2.37 2.49 2.61 2.74 2.87 3.01
3.16 3.32 3.48 3.65 3.83 4.02 4.22 4.42 4.64 4.87 5.11 5.36
5.62 5.90 6.19 6.49 6.81 7.15 7.50 7.87 8.25 8.66 9.09 9.53

Tolerance of the sets:  E6 20%  -  E12 10%  -  E24 5%  -  E48 2% 

Values ​​of resistors in: Ohmio, KKilo-ohmios, MMega-ohmios    IEC = International Electrical Commission

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