capacitor color code

Understanding the color code of a capacitor

In the design of capacitors today, almost all of them have their actual values of capacitance, voltage, or tolerance marked onto their body in form of alphanumeric characters. Today you’ll get to know the color codes of a capacitor in tabular and also the voltage color code of a capacitor.

capacitor color code

Read more: Understanding capacitor

Contents

Capacitor color codes

The color codes of capacitors are marked on their body so that they can be easily characterized and understand by electricians. These color codes indicate the value of capacitance, voltage, and tolerance of the capacitor. When a value of capacitance is marked as a decimal value, the decimal point will not be easily noticed. This will result in a misreading of the actual capacitance value. Instead of letters like p (pico) or n (nano), decimal points are used to identify the position and the weight of the number.

Let take for instance, a capacitor can be marked as, n47 = 0.47nF, 4n7 = 4.7nF or 47n = 47nF and so on. Also, capacitors are sometimes marked with the capital letter K to signify a value of one thousand pico-Farads, so, a capacitor of 100K would be 100 x 1000pF or 100nF. The confusion of the labeled letters, numbers, and decimal points can reduce by using the international color-coding scheme. It was developed many years ago as a simple way of identifying capacitor values and tolerances. It consists of a color band, that is in spectral order, known as the capacitor color code system.

Capacitor color code table

The table below shows the color code of capacitors:

Band ColourDigit ADigit BMultiplier DTolerance (T) > 10pfTolerance (T) < 10pfTemperature Coefficient (TC)
Black00x1± 20%± 2.0pF
Brown11x10± 1%± 0.1pF-33×10-6
Red22x100± 2%± 0.25pF-75×10-6
Orange33x1,000± 3%-150×10-6
Yellow44x10,000± 4%-220×10-6
Green55x100,000± 5%± 0.5pF-330×10-6
Blue66x1,000,000-470×10-6
Violet77-750×10-6
Grey88x0.01+80%,-20%
White99x0.1± 10%± 1.0pF
Goldx0.1± 5%
Silverx0.01± 10%

Read more: Understanding capacitance in AC circuits

Capacitor Voltage Color Code Table

Band ColourVoltage Rating (V)
Type JType KType LType MType N
Black41001010
Brown62001001.6
Red10300250435
Orange1540040
Yellow205004006.36
Green256001615
Blue3570063020
Violet50800
Grey9002525
White310002.53
Gold2000
Silver

Read more: Understanding the charge in a capacitor

Capacitor Voltage Reference

Type J – Dipped Tantalum Capacitors.

K – Mica Capacitors.

L – Polyester/Polystyrene Capacitors.

M – Electrolytic 4 Band Capacitors.

N – Electrolytic 3 Band Capacitors.

The use of capacitor color code is given as:

Metalized Polyester Capacitor

Disc & Ceramic Capacitor

Disc & Ceramic Capacitor

Read more: Understanding Capacitor Voltage Divider

However, the capacitor color code system is not present in use. It was employed a long time ago on unpolarized polyester and mica molded capacitors. But there are still many old capacitors around which is why the color code system is still necessary. Nowadays, capacitors such as disk and film types conform to the BS1852 standard and its new replacement, BS EN 60062. The color system has been replaced by a latter or number-coded system.

Normally, the code is of 2 or 3 numbers and an optional tolerance letter code to identify the tolerance. When two number code is used, the value of the capacitor is given in picofarads, for example, 47 = 47pF and 100 = 100pF, etc. For a three later code, it consists of two value digits and a multiplier just like the resistor color codes in the resistors section. Let take for instance, the digits 471 = 47*10 = 470pF. You should know that three-digit codes are often accompanied by an additional tolerance latter code.

Capacitor Tolerance Letter Codes Table

The table below shows the capacitor tolerance latter codes:

LetterBCDFGJKMZ
ToleranceC <10pF ±pF0.10.250.512
C >10pF ±%0.51251020+80 -20

Consider the capacitor below, it is a ceramic disc type that has the code 473J labeled on its body. So, the 4 is the 1st digit, 7 is the 2nd digit, and the 3 is the multiplier in pico-Farads, pF, and the letter J is the tolerance. This can be translated to 47pF * 1,000 (3 zero’s) = 47,000 pF or 0.047uF and the J represents tolerance of +/- 5%.

ceramic capacitor diagram

Read more: Understanding the dielectric of a capacitor

Now you can see using numbers and letters as codes on the body of capacitors makes it easy to determine their value. Their capacitance values are either in pico-Farad’s, Nano-farads, or Micro-farads. All of these international codes are given in the following table and their equivalent capacitance.

Capacitor Letter Codes Table

The table below shows the international codes for pico-Farad’s, Nano-farads, or Micro-farads and their equivalent capacitance.

Picofarad (pF)Nanofarad (nF)Microfarad (uF)CodePicofarad (pF)Nanofarad (nF)Microfarad (uF)Code
100.010.0000110047004.70.0047472
150.0150.00001515050005.00.005502
220.0220.00002222056005.60.0056562
330.0330.00003333068006.80.0068682
470.0470.00004747010000100.01103
1000.10.000110115000150.015153
1200.120.0001212122000220.022223
1300.130.0001313133000330.033333
1500.150.0001515147000470.047473
1800.180.0001818168000680.068683
2200.220.000222211000001000.1104
3300.330.000333311500001500.15154
4700.470.000474712000002000.2254
5600.560.000565612200002200.22224
6800.680.000686813300003300.33334
7500.750.000757514700004700.47474
8200.820.000828216800006800.68684
10001.00.001102100000010001.0105
15001.50.0015152150000015001.5155
20002.00.002202200000020002.0205
22002.20.0022222220000022002.2225
33003.30.0033332330000033003.3335

Read more: Understanding the dielectric of a capacitor

Watch the video below to learn the color code of capacitors:

That is all for this article where the color codes of capacitors have been discussed. I hope you get a lot from the reading, if so, kindly share with other students. Thanks for reading, see you around!


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