Understanding The Number on Ceramic Disc Capacitor’s

Electronics

What does the capacitor number means?

Ceramic disc capacitors come with a 3 digit number printed on them, this number is used to determine the capacitors capacitance. As the ceramic disc type capacitor’s are small, they are measured in picoFarads (pF).

 

Calculating the capacitance from a ceramic capacitor’s number

The way in which we calculate the capacitance is by breaking the number down into 2 parts, The first part being the first 2 digits give us the first part of the value, followed by the last number which indicates how many zeros we add to give us the capacitance value.

For example, a ceramic disc capacitor with the number, 223 would indicate the capacitance is: 22,000pF  and so on…

 

Converting picofarad (pF) to nanofarad (nF)

With ceramic disc capacitors being such low capacitance, the unit of measurement they use can lead to quite large numbers when recording their values, sometimes you will find it useful to convert their value from picofarad to nanofarad.

A nanofarad is made up of 1,000,000 picofarads, so the calculation require you to divide the pF value by 1,000,000 to get the nF value.

For example, the pF value we worked out in the previous example of 22,000pF would be: 22,000 / 1,000,000 which gives us: 0.022nF. 

 

Common ceramic disc capacitor values

Capacitor NumberCapacitance (pF) PicofaradCapacitance (nF) Nanofarad
11pF0.000001nF
22pF0.000002nF
33pF0.000003nF
44pF0.000004nF
55pF0.000005nF
66pF0.000006nF
77pF0.000007nF
88pF0.000008nF
99pF0.000009nF
1010pF0.000010nF
1515pF0.000015nF
1818pF0.000018nF
2020pF0.000020nF
2222pF0.000022nF
2727pF0.000027nF
3030pF0.000030nF
3333pF0.000033nF
4040pF0.000040nF
4747pF0.000047nF
5050pF0.000050nF
5656pF0.000056nF
6868pF0.000068nF
8282pF0.000082nF
101100pF0.0001nF
121120pF0.00012nF
141140pF0.00014nF
151150pF0.00015nF
181180pF0.00018nF
221220pF0.00022nF
301300pF0.0003nF
331330pF0.00033nF
471470pF0.00047nF
561560pF0.00056nF
681680pF0.00068nF
821820pF0.00082nF
1021,000pF0.001nF
1521,500pF0.0015nF
2022,000pF0.002nF
2222,200pF0.0022nF
3323,300pF0.0033nF
4724,700pF0.0047nF
6826,800pF0.0068nF
10310,000pF0.01nF
15315,000pF0.015nF
20320,000pF0.02nF
22322,000pF0.022nF
33333,000pF0.033nF
47347,000pF0.047nF
68368,000pF0.068nF
104100,000pF0.1nF

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