How to calculate the capacitance of a chip capacitor 2

2. Marking codes: Surface-mount capacitors usually have marking codes printed on their surfaces, which indicate the capacitance. Different manufacturers may use different marking systems, but typically, these codes consist of one to three digits, sometimes accompanied by a letter. For example, a capacitor marked with "104" indicates a capacitance of 10 × 10^4 pF, which is 100 nF or 0.1 μF.

3. Capacitance Measurement Instrument: If you have a capacitance measurement instrument (such as a multimeter with capacitance measurement function), you can directly measure the actual capacitance of the capacitor. Connect the capacitance setting of the measurement instrument to the two leads of the capacitor, ensuring the capacitor is discharged and isolated from other circuits, then you can directly read the capacitance value. diode

4. Calculation formula: Theoretically, if you know the physical parameters of the capacitor, such as the relative permittivity of the dielectric (εr), the area of the dielectric (A), and the thickness of the dielectric (d), you can use the following formula to calculate the capacitance of an ideal capacitor:diode

C = ε0 * εr * A / d

among which

C is the capacitance of the capacitor (farads, F);

ε0 is the vacuum permittivity, approximately 8.854 × 10^-12 F/m;

εr is the relative permittivity of the dielectric;

A is the area of the medium (square meters, m²);

d is the thickness of the medium (meters, m). diode