SMD capacitors are PCB parts consisting of two metal pieces separated by an insulator and mainly used to store energy. "C" stands for capacitance, and the unit of capacitance is Farad (F).
The unit F is too big for SMDs' capacitance, and we usually use the smaller unit μF, nF, pF. 1μF equals to 1000nF, 1nF equals to 1000pF.
There are two methods to indicate the capacitance value on the SMD capacitors' appearance.
1. Directly denote the capacitance and working voltage on the capacitors, for example, 10μF/16V.
2. In a combination of Arabic numbers and working voltage: the first two numbers indicate the absolute numbers of the capacitance value, and the last number means the power of 10.
For example, 107 means 10 × 10^7pF (= 100μF), 225 means 22 × 10^5pF (=2.2μF)
Besides, on SMD capacitors, the capacitance is denoted by a combination of numbers and a letter.