The fourth band represents the tolerance. The third band represents the multiplier. In a four-band resistor, which is the most common, the first two bands also represent the first two significant digits. Since no tolerance band is available, the tolerance will always be ☒0%. In a three-band resistor, the first two bands represent the first two significant digits followed by one band for the multiplier. It is always better to check the manufacturer’s documentation or use a multimeter to get the exact resistance value. If a gold or silver band is present, then they must be at the right end since they are never used for significant digits. A larger gap between the tolerance band and the other bands is sometimes noticeable. To distinguish the reading direction, the tolerance band width is sometimes printed with 1.5 - 2 times the width of other bands. The reading direction is not always clear. Resistors cases usually have three to six bands that indicate their resistance, tolerance and sometimes their temperature coefficient of resistance (TCR). It describes the coding standard for both resistors and capacitors. The coding is defined in the international standard IEC 60062:2016. Surface mounted resistors (SMD) use another coding system that uses alphanumeric codes printed on its surface instead of color codes. When the resistor body surface is large enough, as in large wattage resistors, the resistance value, tolerance, and wattage are usually printed on the body of the resistor. Color-coding is also used for capacitors, inductors and diodes. Color bands are used because they can be easily and cheaply printed on a small electronic component.
Select the number of bands on the resistor you are trying to identify.To use the calculator, follow these easy steps: This calculator supports resistors with 3, 4, 5, and 6 bands.
It will also calculate the minimum and maximum values based on the tolerance ratio. The value of the resistance is marked with the colors.This calculator will help you identify the value, tolerance and temperature coefficient of a color coded resistor by simply selecting the bands colors.
DIGI KEY RESISTOR COLOR CODE CALCULATOR HOW TO
OK, let's get down to brass tacks: How to read resistor color code? If none of the above appear to help your problem, you can always use a multimeter to tell between two possible resistances – and reading directions. Usually, the first band will be closest to the end (but not always, so then use other clues).
Again, read the resistor from left to right. However, the resistor color code never starts from such color – so if you find the metallic color on your resistor, it's definitely the tolerance value, so it must be placed on the right side. These values are marked with metallic colors – gold and silver, respectively. Very often, the tolerance of the resistor is equal to 5% or 10%. Put the bigger group on the left side and read resistors from left to right. The larger gap occurs before the tolerance band. In a usual case, the bands are not spaced regularly – there's a gap, and bands are somehow grouped. The first question which usually arises is: how do I know from which end I should start reading my resistor color code?įortunately, a couple of visual hints exist! The printed alphanumeric codes would be too small to read on the tiniest resistors, so the color code was developed in the early 1920s. Color bands are an easy and cheap way of indicating the value of an electronic component.
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