The capacitance in pF is equal to all digits linked together with a decimal point on the location of the R in this case. The letter at the end indicates the tolerance. These values can be found in the table below. We have a capacitor with the code 156J. The capacitance is 15·10 6 pF = 15μF. The tolerance for J is 5%.
Entering a 3-digit number from your capacitor will display the capacitance value in µF, nF, or pF units. Select a tolerance code to determine the capacitor's tolerance. For Voltage Codes, use the table on the left. Result will be displayed here... If the capacitor code has 1 or 2 digits, it represents its value in pF.
Component manufacturers indicate tolerance with a letter code that refers to variances as small as +/- 0.5pF (indicated as A) up to -20/+80% (written as Z). The capacitor tolerance chart below shows some common tolerance letter codes: With these guidelines, you should be able to quickly check the specs of any capacitor you are using.
Chart1: CAPACITOR MARKING CODE STANDARDIZED BY THE ELECTRONIC INDUSTRY ALLIANCE (EIA) The voltage rating on a capacitor indicates the maximum voltage it can safely handle. This parameter is ensuring safety and performance, as it prevents over-voltage failures that can damage both the capacitor and the surrounding circuitry.
Other optional data may include values such as: Component manufacturers indicate tolerance with a letter code that refers to variances as small as +/- 0.5pF (indicated as A) up to -20/+80% (written as Z). The capacitor tolerance chart below shows some common tolerance letter codes:
Smaller capacitors often use a code consisting of three numbers and sometimes one letter. You can use this calculator to calculate the capacitance and tolerance of a capacitor. The capacitance in picofarad (pF) is equal to the first two digits multiplied by ten to the power of the third digit: C = AB·10 C .