Inductor Color Code

Inductor Color Code
Inductor Color Code

The value, range, and temperature coefficient of an inductor can be determined using the Inductor Color Code. The sole function of electrical components known as inductors is to store energy within a magnetic field. These qualities are made more visible by the color coding, which involves applying many colored bands to the inductor’s surface. By understanding and using the color code, one may determine the inductance value and other crucial characteristics. This guide’s objective is to provide a comprehensive overview of the Inductor Color Code, including its purpose, significance, and origins.

The Function of the Inductor’s Color Code

To facilitate accurate and efficient retrieval of inductor-related data, the Inductor Color Code has been developed. This method allows engineers, technicians, and enthusiasts to learn the inductance value, tolerance, and temperature coefficient of an inductor with little to no testing or measurement required. Time is of the essence in many electronic operations, and this method is essential for selecting and assembling the correct inductors. The correct operation of electrical circuits and systems can be guaranteed by adhering to the regulations for each color code.

1.2 The Significance of Being Familiar with the Color Code

Understanding the Inductor Color Code is crucial in the field of electronics. When looking up inductor values, tolerances, and temperature coefficients, it is common practice to use color codes. Failure to understand the color code can result in incorrect inductor parameters, which in turn can cause improper component selection and, ultimately, malfunctions in electrical circuits. In order to deal with inductors more efficiently, resolve issues, and ensure proper integration of their designs, experts should familiarize themselves with the color code.

The Decade Origins of the Inductor Color Code

Engineers were aware that a standardized method of representing inductor counts was necessary prior to the development of the Inductor Color Code. Midway through the twentieth century, this occurred. Miscommunication and errors ensued due to the lengthy strings of letters and numbers utilized to represent inductor values prior to the color coding scheme. The 1950s saw the creation of the color code. Different numbers and factors are shown using a variety of colored bands. The color scheme evolved through time to incorporate additional bands representing temperature coefficient and range. In today’s electronics industry, the Inductor Color Code has become an indispensable tool.

Making use of text markings to determine the value of an inductor

Here, the inductor’s worth is displayed on its outside in the form of numerical and alphabetic symbols. Although no other units are provided, the basic unit of measurement for this mark is the micro henry. In order to determine an inductor’s value using the text marking approach, follow these steps.

It consists of three or four letters, which can be either numbers or alphabetical.

The initial two digits display the numerical value.

When combined with the previous two, the third value represents the appropriate amount of power. The sum of the first two digits is ten in this instance. Ten micro Henry (µH) is the notation for the number 101, for instance.
A fourth-letter inductor code indicates the inductor’s tolerance value. Assume this is the letter K. One tenth of a percent is the tolerance. In the case of a letter J, the margin of error is up to 15%. In the case of M, it’s ± 20%, and the same goes for the other integers. To see what each letter number stands for, go to the table that follows.
Ascertaining the inductor’s worth through the use of written language

Four-Band Inductor Color Code

Above we can see the 4-band inductor, which is characterized by its four distinct color bands. You can see the first two digits of the value in the first color band, and the second digits in the second color band. The range is represented by the fourth band, and the multiplier by the third color band.So, by comparing the inductor’s external colors to a color coding chart, you may determine its value. Remember that the figure with the different colors represents a number in micro Henry (µH) units.Y

To begin, make a note of the inductor’s tolerance %; this number is typically shown in black, silver, or gold.
Now pay attention to the colors on the opposite side of the inductor. The inductor’s first band is red, and the accompanying number in the table is 2.

Continue to the second set of musicians. Using the color table as a guide, note down the corresponding number for each shade. On the second band, you can see the number 7 in pink. The following digit is “27.”

Up next, we have the third band. The accompanying number is 10, and the multiplier is brown in color.

The inductor’s value is 270 uH, which is 27 times 10 uH, given a range of ±5%.

Gold and silver are two possible options for this repeater band. Then, divide the result by 10. In the case of a silver multiplier, divide the value by 100.

The military uses this color designation for 5-band inductors.

Five colored bands are common on cylindrical inductors. The large metal band on one end of military radio-frequency inductors distinguishes them. The fourth band shows tolerance, while the next three bands reveal micro Henries inductance.

This type of inductor has tolerance values between one percent and twenty percent. The second or third band, which is gold, indicates the decimal point if the inductance is less than 10. The last two bands display the range and the two crucial parts.

Looking at the MIL band, the first two bands display the significant bits if the inductance number is 10 or greater, the third band represents the multiplier, and the fourth band represents the tolerance.

Codes for Chip Inductors or Surface Mount Devices (SMD) are what it stands for.
Rather than having bands on the surface, some inductors feature little dots of color. It is common practice to code these using the surface’s top colored dot. The inductor’s number, as measured clockwise from this top dot, must be determined. These dots will not indicate the direction of up or down. To measure this type of inductance, nano-henries are utilized.

Identification of RF Inductors by Color

In many ways, they are similar to chip inductors. These aren’t nearly as large. A single or cluster of colored dots represents the value of this inductor due to its size.

The image below shows a component with a single colored dot either at one end or in the center. The data page for each inductor series type will provide the corresponding number of inductance. There is no polarity indication in this dot.


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