Of course you can read the values with a meter, but whats the fun in that? I hope you all learned something from this little write up. Now you will notice that the last two resistor have an "R" in the equation. ![]() If a letter is used to represent tolerance use the chart below. You may ask"why some have three diigits and some have four?" three digits typically means that the resistor is 5% tolerance the four digit typically means the resistor is 1% tolerance. The formula is the same with the addition to a digit.ġst value-2nd value-third value-multiplier Unfortunately, some packageshave more than one name. ![]() As an example: The QuadFlat Pack is commonly known as the QFP. Thesenames are usually abbreviated by their initials. Each time anew surface mount package is developed a new name is created. There are some resistors which have 4 digits. Nomenclature There are many different types of surface mount packages. The formula for breaking the code down is as follows. That does not stand for a 391 ohm, 270 ohm, and so on. Looking at the image you see 4 resistors, the first being 391 the seconed 270 and the two at the bottom are the same 30R9. I will teach you how to take those letters and digits and determine the value. ![]() Unlike Through hole resisors which use colored bands to determine the value, surface mount resistor have numbers and sometimes letters.
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