Inductor Value Markings

Some codes contain the letter r which represents the decimal point. Each color represents a value.

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Inductor markings as with capacitors the vast majority of inductors use written markings to indicate values working current and tolerance.

Inductor value markings. C ab10 c. Power inductors except for our smallest series are commonly marked with a three digit code that corresponds to the three numbers that follow the dash in the part number. A circuit requires an inductor of 68uh with a tolerance of 5.

For inductors of a very small physical size coloured dots may be used instead of bands. In the above figure inductor is marked with three colors and hence the value of the inductor is given as yellow violet and orange 47000 nf generally these rf variable inductors have the size and voltage specifications marked on the side of the inductors. The final letter k indicates that the inductor has a tolerance of 10.

Inductors can be labeled with a number of different ways. To quickly sort out the inductance value of these inductors i use a simple method which i am sure will interest other inductor ignorami. In such cases the silver dot indicating a military mil specification will be larger than the other dots and will be placed a the beginning of the dot sequence.

The value of the inductor is thus 470uh. An inductor has a winding direction polarity and the marking is placed so that the polarity can be confirmed from its external appearance. Depending on usage conditions the polarity of the inductor can affect the inductors characteristics.

For inductors the value is usually in micro henrys eg. Some inductors have some numbers printed on them while others are marked with colored dots which are a disaster anyway because i am color blind. The marking in uh will show the first two digits 68 followed by the number of zeros 0.

In some cases only a single coloured dot is. What is it likely to be marked. A inductor marked 220 woulf be 22uh 22 x 100 1 uh the part marked 3r3 is a 33 ohm resistor as r is used on resistors.

The most usual method of marking ferrite cored inductors involves quoting the value in mh or mh the tolerance often either 5 or 10 and the maximum working current where appropriate. Surface mount device smd or chip inductor codes. This code refers to the value in nanohenries where the first two digits are the value and the last digit is the multiplier 10x or number of zeros that follow.

Inductors can be marked by colored bands or colored dots. The inductance in mh is equal to all digits linked together with a decimal point on the location of the r in this case. Share improve this answer.

The inductance in microhenry mh is equal to the first two digits multiplied by ten to the power of the third digit. The most common are text codes and color codes.

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