User Tools

Site Tools


Standard capacitor worst-case electrolytic ESR table

Obviously the value in the table are in ohms!

ESR is the abbreviation for “Equivalent Series Resistance”, sometimes referred to as “Effective Series Resistance”. ESR is a DYNAMIC (AC) property of a capacitor and cannot be measured with a DC ohm meter. ESR can be considered to be the total series NON-REACTIVE AC resistance of a capacitor. ESR includes the DC resistance of the leads, DC resistance of the connections to the dielectric, capacitor plate resistance, and the IN-PHASE AC resistance of the dielectric material. The combination of components that make up ESR are symbolized by a resistor in series with a capacitor.

Why check ESR? An increase in ESR is the first indicator of a bad capacitor. As a capacitor fails its’ ESR increases until ESR reaches infinity, total failure. By measuring ESR one can locate failing capacitors before they quit completely. Often a capacitor will measure GOOD with a capacitance reading meter yet it will actually be BAD due to increased ESR! Todays' modern circuits are designed with low ESR parts. Checking ESR guarantees a reliable test of a capacitors health.

electronic/standard_capacitor_worst-case_electrolytic_esr_table.txt · Last modified: 2019/03/20 12:00 by cosmo