7 is not.
What does the numbers on small ceramic capcitors mean.
A ceramic capacitor is a capacitor which uses a ceramic material as the dielectric.
Many capacitor manufacturers use a shorthand notation to indicate capacitance on small caps.
Ceramic capacitors which are usually tiny pancakes with two pins typically list the tolerance value as one letter immediately after the three digit capacitance value.
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.
The above image shows a mylar film capacitor.
If you have a capacitor that has nothing other than a three digit number printed on it the third digit represents the number of zeros to add to the end of the first two digits.
Ceramic disc capacitors have two to three digits code printed on them.
The top 683 marking indicates the capacitance value which is 68 000 picofarads pf.
Unlike their electrolytic counterparts ceramic capacitors hold a smaller charge but also leak less current.
Class 1 and class 2.
They also happen to be the cheapest capacitor of the bunch so stock up.
Although they work in completely different ways capacitors and batteries both store electrical energy if you have read how batteries work then you know that a battery has two terminals inside the battery chemical reactions produce electrons on one terminal and absorb electrons on the other terminal.
This also is the same for 5 µf and the 4 µf capacitors.
You can quickly identify a through hole ceramic capacitor by looking for the small yellow or red bulbs with two terminals sticking out of them.
In a way a capacitor is a little like a battery.
Characteristics precision and tolerances.
There are three exceptions for the last digit.
However small capacitors don t have enough room for all that.
As you can see the high side of the 35 µf capacitance tolerance 37 1 µf does not meet the low side of the capacitance tolerance of the 40 µf 37 6 µf capacitor you are trying to replace it with.
This letter represents the tolerance of the capacitor meaning how close the actual value of the capacitor can be expected to be to the indicated value of the capacitor.
The two most common types are multi layer ceramic capacitors and ceramic disc capacitors.
5 µf 6 4 7 to 5 3 µf 4 µf 6 3 76 to 4 24 µf.
When the first two numbers are multiplied with the multiplier the resulting value is the value of the capacitor in picofarads.
There are two classes of ceramic capacitors available today.
