Ceramic Capacitor Marking Reader

If code is 3r9 then r is an indicator of values less than 10pf and has nothing to do with resistance.

Ceramic capacitor marking reader.

222k is a 2 2 nf capacitor with a 10 tolerance. The markings on a ceramic capacitor are more concise in nature since it is smaller in size as compared to electrolytic capacitors. 682k is 6 8 nf 10 tolerance. Ceramic capacitors are generally smaller than types like electrolytic capacitors and therefore the markings need to be more concise.

Atc provides component and custom integrated packaging solutions for the rf microwave and telecommunications industries atc designs develops manufactures and markets multilayer capacitors single layer capacitors resistive products inductors and custom thin film products for rf microwave and millimeter wave applications. To get this value you multiply the leading digits 68 in this case by 10 raised to the power of the last digit 3 and the result is the capacitance in picofarads in this case we get 68x10 3 pf. Values with the letter capital k represents 10 tolerance. Example 103k is a 10 nf capacitor with a 10 tolerance.

3r9 would be 3 9pf. For beginners some values might prove confusing. 823k is 82 nf 10 tolerance. Often the value may be given in picofarads.

Reading values printed on electrolytic capacitors is easy digits on ceramic capacitors need to know some theory. Like resistors has some coding which needs to decipher printed digits on ceramic capacitors also needs deciphering. American technical ceramics corp. There are three exceptions for the last digit.

Some small capacitance capacitors can be marked with an r between numbers. A variety of schemes may be used. The above image shows a mylar film capacitor. Has a very low dissipation factor and are very stable over wide variations in temperature frequency voltage and time.

The top 683 marking indicates the capacitance value which is 68 000 picofarads pf. Markings of ceramic capacitor. 7 is not. The value of the capacitor is indicated in picofarads.

My article on ceramic disc capacitor values might help with the tolerance letters. I have always been unaware of the markings on a disc ceramic capacitor such as j m and other symbols. Unlike resistors capacitors use a wide variety of codes to describe their characteristics. Some capacitors are only marked as 0 1 or 0 01 mostly in these cases the values are given in uf.

Sometimes figures such as 10n will be seen and this indicates a 10nf capacitor. Thus for such concise markings many different types of schemes or solutions are adopted.