How To Read Mica Capacitor

These had even worse tolerance and stability than other clamped capacitors since the mica surface is not perfectly flat and smooth. The first dot on a mica capacitor is white to indicate eia six dot code.

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In either case read the capacitance in picofarads from the next three color dots.

How to read mica capacitor. Always measure the capacitance if you arent able to read the information on the capacitor. During manufacture the capacitors are loaded into a pick and place machine and there is no need for any markings. The capacitor should support a higher voltage than the circuit you use it in.

As with smaller disc capacitors the capacitance is usually smaller than 1uf and go into pf pico farads when determining the capacitance of these disc style capacitors they have numbers printed onto one face these numbers are read similar to reading resistor values where the first two numbers are the significant numbers and the third number is the multiplier number of zeros to add to the value. These are read as pico farads. See chart above for tolerance color codes the sixth dot indicates classes a to e.

Otherwise it may break down possibly explode under operation. References to mica capacitors from the 1920s always refers to this type. First most will have three numbers but sometimes there are just two numbers.

To determine the type and value of the capacitor hold the capacitor so that the three arrows point left to right. The fifth dot will indicate the tolerance. The color dots must be read in the correct sequence a b c from left to right in order to correctly interpert the color code.

1000000 picofarads pf equals 1 microfarad uf. In order to make certain that the capacitor will be held in the proper position while the dots are being read manufacturers have adopted several 3 dot marking arrangements. It may also be black for military code.

There are 2 distinct types of mica capacitor. The capacitor can also list information on operating voltages. The first dot at the base of the arrow sequence the left most dot represents the capacitor type.

Now obsolete these were in use in the early 20th century. Surface mount capacitors are often very small and do not have the space for markings. Smd ceramic capacitor codes.

They consisted of sheets of mica and copper foil sandwiched together and clamped. Large capacitors usually have their value printed plainly on them such as 10uf ten micro farads but smaller disk types along with plastic film types often have just 2 or three numbers on them. The capacitor shown in figure 3 21 represents either a mica capacitor or a molded paper capacitor.

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