Values below 10 pF may use "R" for a decimal point, 4R7 = 4.7 pF for example. This, like most marking systems, is based on the picofarad, the lowest common denominator of capacitance. On small through-hole ceramics, a two-number-plus-exponent system is often (but not always) used. However, the smaller the part gets, the less information you get until, on the smallest parts there may be nothing at all. If the manufacturer has lots of room (like on big electrolytics) they will usually print everything they can value, voltage rating, temperature rating, series, even country of manufacture. It would be nice if there was more consistency to capacitor markings. Microwave capacitors go down to at least 50 fF, but are called 0.05 pF. ![]() "Femto farad " (fF) is used for things like RAM chip storage capacitors, but there are no discrete capacitors in that size range. Nano is rather less common than micro and pico, but it still shows up. ![]() ![]() First, let's get our nomenclature straight.
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