☑ Disc Capacitor Markings

They are very easy to decode to find the value. All you need to decode the markings on many types of capacitors.

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With smaller disc type capacitors tolerance is most often indicated by a single letter code which is sometimes placed by itself on the body of the capacitor or after the three digit mark such as 104z the letter z donates a tolerance of 80 percent and 20 percent.

Disc capacitor markings. A though rough list of codes marks and values. Ceramic disc capacitors like the one on the left are printed with a code. A though rough list of codes marks and values.

The example capacitor has a 3 digit number printed on it 103. The first two significant digits represent the first two digits of the actual value which is 47. Ceramic capacitors are generally smaller than types like electrolytic capacitors and therefore the markings need to be more concise.

A ceramic capacitor is a fixed value capacitor where the ceramic material acts as the dielectricit is constructed of two or more alternating layers of ceramic and a metal layer acting as the electrodesthe composition of the ceramic material defines the electrical behavior and therefore applications. You need a code 471 for a 470pf capacitor. It indicates that the capacitor breaks down at 50 volts.

Finally the white stripe indicates the negative leg of this capacitor which is generally also the shorter leg. The top 683 marking indicates the capacitance value which is 68000 picofarads pf. This code indicates what the capacitance of the capacitor is.

A variety of schemes may be used. The above image shows a mylar film capacitor. Both parts of each calculator work separately you do not have to enter both value code and tolerance code.

I have always been unaware of the markings on a disc ceramic capacitor such as j m and other symbols. All you need to decode the markings on many types of capacitors. This indicates a 22uf capacitor with a maximum voltage of 6v.

Ceramic disc capacitor code label will normally consist of three numbers followed by a letter. These calculators can convert the 3 digit value codes and alphabetical tolerance codes found on some capacitors into the corresponding value and vice versa. The third digit is the multiplier which is 1000.

Taking a look at this site today has enlightened me to not only letters on the caps but voltage codes as well. Disc capacitors are usually ceramic and for a 5 mm wide capacitor 500v. The first two digits in this case the 10 give us the first part of the value.

Typically the markings on a capacitor may give the figures like 22 and 6v.

Capacitor Codes Markings Electronics Notes