| CAP. | 10 V | 16 V | 25 V | 35 V | 50 V | 63 V | 100 V | 160 V | 250 V | 350 V | 450 V |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 µF | 2,1Ω | 2,4Ω | 4,5Ω | 4,5Ω | 8,5Ω | 9,5Ω | 8,7Ω | 8,5Ω | 3,6Ω | ||
| 2,2 µF | 2,0Ω | 2,4Ω | 4,5Ω | 4,5Ω | 2,3Ω | 4,0Ω | 6,1Ω | 4,2Ω | 3,6Ω | ||
| 3,3 µF | 2,0Ω | 2,3Ω | 4,7Ω | 4,5Ω | 2,2Ω | 3,1Ω | 4,6Ω | 1,6Ω | 3,5Ω | ||
| 4,7 µF | 2,0Ω | 2,2Ω | 3,0Ω | 3,8Ω | 2,0Ω | 3,0Ω | 3,5Ω | 1,6Ω | 5,65Ω | ||
| 10 µF | 8,0Ω | 5,3Ω | 2,2Ω | 1,6Ω | 1,9Ω | 2,0Ω | 1,2Ω | 1,4Ω | 1,2Ω | 6,5Ω | |
| 22 µF | 5,4Ω | 3,6Ω | 1,5Ω | 1,5Ω | 0,8Ω | 0,9Ω | 1,5Ω | 1,1Ω | 0,7Ω | 1,1Ω | 1,5Ω |
| 33 µF | 4,6Ω | 2,0Ω | 1,2Ω | 1,2Ω | 0,6Ω | 0,8Ω | 1,2Ω | 1,0Ω | 0,5Ω | 1,1Ω | |
| 47 µF | 2,2Ω | 1,0Ω | 0,9Ω | 0,7Ω | 0,5Ω | 0,6Ω | 0,7Ω | 0,5Ω | 0,4Ω | 1,1Ω | |
| 100 µF | 1,2Ω | 0,7Ω | 0,3Ω | 0,3Ω | 0,3Ω | 0,4Ω | 0,15Ω | 0,3Ω | 0,2Ω | ||
| 220 µF | 0,6Ω | 0,3Ω | 0,25Ω | 0,2Ω | 0,2Ω | 0,1Ω | 0,1Ω | 0,2Ω | 0,2Ω | ||
| 330 µF | 0,24Ω | 0,2Ω | 0,25Ω | 0,1Ω | 0,2Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,2Ω | ||
| 470 µF | 0,24Ω | 0,18Ω | 0,12Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,15Ω | ||
| 1000 µF | 0,12Ω | 0,15Ω | 0,08Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | ||
| 2200 µF | 0,12Ω | 0,14Ω | 0,14Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | ||
| 3300 µF | 0,12Ω | 0,13Ω | 0,12Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | ||
| 4700 µF | 0,12Ω | 0,12Ω | 0,12Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω | 0,1Ω |
| CAP. | 10 V | 16 V | 25 V | 35 V | 63 V | 160 V | 250 V |
|---|---|---|---|---|---|---|---|
| 4.7 µF | >40Ω | 35.0Ω | 29.0Ω | 24.0Ω | 19.0Ω | 16.0Ω | 13.0Ω |
| 10 µF | 20.0Ω | 16.0Ω | 14.0Ω | 11.0Ω | 9.3Ω | 7.7Ω | 6.3Ω |
| 22 µF | 9.0Ω | 7.5Ω | 6.2Ω | 5.1Ω | 4.2Ω | 3.5Ω | 2.9Ω |
| 47 µF | 4.2Ω | 3.5Ω | 2.9Ω | 2.4Ω | 2.0Ω | 1.60Ω | 1.40Ω |
| 100 µF | 2.0Ω | 1.60Ω | 1.40Ω | 1.10Ω | 0.93Ω | 0.77Ω | 0.63Ω |
| 220 µF | 0.90Ω | 0.75Ω | 0.62Ω | 0.51Ω | 0.42Ω | 0.35Ω | 0.29Ω |
| 470 µF | 0.42Ω | 0.35Ω | 0.29Ω | 0.24Ω | 0.20Ω | 0.16Ω | 0.13Ω |
| 1000 µF | 0.20Ω | 0.16Ω | 0.14Ω | 0.11Ω | 0.09Ω | 0.08Ω | 0.06Ω |
| 2200 µF | 0.09Ω | 0.07Ω | 0.06Ω | 0.05Ω | 0.04Ω | 0.03Ω | 0.03Ω |
| 4700 µF | 0.04Ω | 0.03Ω | 0.03Ω | 0.02Ω | 0.02Ω | 0.02Ω | 0.01Ω |
| 10000 µF | 0.02Ω | 0.02Ω | 0.01Ω | 0.01Ω | 0.01Ω | 0.01Ω | 0.01Ω |
| CAP. | 10 V | 16 V | 25 V | 35 V | 63 V | 160 V | 250 V |
|---|---|---|---|---|---|---|---|
| 1 µF | 14Ω | 16Ω | 18Ω | 20Ω | |||
| 2.2 µF | 6Ω | 8Ω | 10Ω | 10Ω | 10Ω | ||
| 4.7 µF | 15Ω | 7.5Ω | 4.2Ω | 2.3Ω | 5Ω | ||
| 10 µF | 6Ω | 4Ω | 3.5Ω | 2.4Ω | 3Ω | 5Ω | |
| 22 µF | 5.4Ω | 3.6Ω | 2.1Ω | 1.5Ω | 1.5Ω | 1.5Ω | 3Ω |
| 47 µF | 2.2Ω | 1.6Ω | 1.2Ω | 0.5Ω | 0.5Ω | 0.7Ω | 0.8Ω |
| 100 µF | 1.2Ω | 0.7Ω | 0.32Ω | 0.32Ω | 0.3Ω | 0.15Ω | 0.8Ω |
| 220 µF | 0.6Ω | 0.33Ω | 0.23Ω | 0.17Ω | 0.16Ω | 0.09Ω | 0.5Ω |
| 470 µF | 0.24Ω | 0.2Ω | 0.15Ω | 0.1Ω | 0.1Ω | 0.1Ω | 0.3Ω |
| 1000 µF | 0.12Ω | 0.1Ω | 0.08Ω | 0.07Ω | 0.05Ω | 0.06Ω | |
| 4700 µF | 0.23Ω | 0.2Ω | 0.12Ω | 0.06Ω | 0.06Ω |
What is ESR? Equivalent Series Resistance (ESR) is the internal resistance of a capacitor. It is a critical indicator of a capacitor's health and performance, especially in power supplies and high-frequency circuits.
Why measure it? As electrolytic capacitors age, their electrolyte evaporates, causing the ESR to increase. A capacitor can still show its rated capacity (µF) while having a high ESR, which leads to circuit failure or instability.
How to use: Use an ESR meter to measure the capacitor. While measurement is sometimes possible in-circuit, for truly reliable readings, always measure outside the circuit. Compare the result to these tables based on the capacitor's rated voltage and capacity. The measured value should always be lower than the reference value in the table. If it is significantly higher, the capacitor is faulty and must be replaced.
Sources and Variance: The three tables provided above are compiled from various sources. ESR reference data is not standardized; therefore, some variation in measurements and critical threshold values is inherent to the process. These tables should be used as a general guideline.