ESR is the short form of equivalent series resistor.

Theoretically Ideal capacitor would be lossless and have an ESR of zero. As being ideal capacitors and Inductor has a series resistor, this resistance is defined as the

**equivalent series resistance**(**ESR**).
For calculating ESR of any capacitor we should know dissipation factor i.e.

**DF**(Dissipation factor is known as the tangent of the loss angle and is commonly expressed in percent) and capacitive reactance**Xc****=**(**2* π*f*C**)
Hence

**ESR=DF*Xc**

**DF/(2* π*f*C)**

For example if you want to calculate ESR of ceramic capacitor of value 0.1uF/50V

Dissipation factor DF is 5% at 120Hz

therefore,

5/2*3.14*120*0.1×10

^{-6}x100
= 66.34Ohms

so the ESR of ceramic capacitor of 0.1uF/50V will be 6.6mOhms

For Power integrity and Signal integrity analysis,ESR is the important factor.

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