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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Identify a low-ESR capacitor by its exact manufacturer part number, then check its datasheet for ESR or impedance at the frequency and temperature relevant to your circuit. If you need to verify a loose or installed part, use an ESR-capable meter or LCR meter and note its test conditions. Appearance and labels such as “polymer” cannot establish a specific part’s ESR.
What ESR tells you—and what it does not
Equivalent series resistance (ESR) models resistive loss inside a real capacitor. Under AC or ripple current, that loss contributes to heat. ESR is only one part of a capacitor’s behavior; capacitance, equivalent series inductance (ESL), leakage, and other parasitic effects matter too. Analog Devices’ capacitor overview and its discussion of grounding, decoupling, and capacitor parasitics explain why a single ESR number does not describe performance in every circuit.
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ESR changes with frequency and temperature. A value is meaningful only alongside its measurement conditions, and comparisons should use the same conditions or a frequency relevant to the circuit. KEMET’s radial aluminum electrolytic capacitor guidance notes this dependence and relates ESR to dissipation factor (tan δ) and capacitance. Do not treat a dissipation-factor value as a universal ESR figure: use the equation and conditions given for the specific part family.
How to identify a capacitor’s ESR from its markings and datasheet
- Record the full component identity. Note the complete marking, polarity, package, and manufacturer logo. Use those clues to find the actual manufacturer part number and its datasheet. Sleeve color, size, or a broad construction label such as “polymer” may help narrow the search, but none guarantees a particular ESR. If you cannot confirm the part number, treat the identification as uncertain.
- Find the relevant specification. In the datasheet, look for ESR, impedance, dissipation factor (tan δ), or an impedance-versus-frequency curve. Check the test frequency, temperature, signal level, and whether the value is typical or a maximum. Keep the capacitance, voltage rating, ripple-current rating, operating-temperature range, and package in view as well.
- Compare like with like. Compare ESR or impedance at the frequency and temperature that matter to your application. If the datasheet provides only a curve or a dissipation-factor specification, use the manufacturer’s stated method and conditions rather than comparing unlike values. Capacitance tolerance also affects calculations that use capacitance.
For example, KEMET’s ESE guidance specifies a capacitance measurement using an AC voltage no greater than 0.5 V at 100 or 120 Hz and 20°C under the cited IEC methods. Those are conditions for that stated capacitance measurement—not a universal ESR-meter setting or a substitute for the test conditions in another part’s datasheet. See the ESE series guidance and datasheet.
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- High Frequency Lowesr, High precision aluminum electrolytic capacitors. temperature range from -40℃ to +105℃, tolerance ±20%, stable and durable for long life use.
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How to measure ESR with a meter
An ESR meter is convenient for a quick check. An LCR meter or impedance instrument that reports series resistance (Rs/ESR) can also help. Record the instrument’s test frequency, temperature, and setup so you can interpret the result. HIOKI’s electrolytic-capacitor measurement guidance recommends considering the frequency at which the circuit operates and describes measuring ESR and loss with capacitance under the same conditions.
- Make the circuit safe. Do not connect a meter to powered equipment. Before testing, follow the equipment’s safe discharge procedure, taking particular care with capacitors that may hold hazardous energy. Follow the instrument manual; the Peak Atlas ESR user guide warns against connection to powered equipment and puts responsibility on the user to discharge dangerously charged capacitors.
- Choose the measurement setup. Use the meter’s documented procedure and note the test frequency and other conditions. For an application-specific comparison, use a frequency relevant to the circuit where the instrument permits it.
- Interpret in-circuit readings cautiously. Other components and circuit paths can affect the reading. A low number measured on a board does not by itself prove that the capacitor has low ESR. If a result is ambiguous, isolate a lead or test the part out of circuit.
- Compare against the right reference. Use the exact part’s datasheet and its conditions, or compare candidate parts measured with the same setup. Do not assume a meter reading must match a datasheet value taken at a different frequency or temperature.
How to choose a suitable replacement
Low ESR is useful in applications such as switching-supply smoothing, but “lower” is not automatically “better.” A capacitor’s ESR can contribute damping, and changing it may affect a regulator’s control-loop behavior. Panasonic discusses cases where low output-capacitor ESR may cause instability or oscillation in its guidance on low-ESR capacitors and low-pass filters. Follow the circuit or regulator documentation rather than selecting the lowest ESR part by default.
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- 🔴 1000uF 25V 10x20mm RADIAL LEAD ALUMINUM ELECTROLYTIC CAPACITORS 🟠 ESR 0.046Ω at 20°C, 100kHz, ESR 0.18Ω at -10°C, 100kHz, 🟡 Ripple Current 1400mA/105°C, 🟢 10000hrs at 105°C, 36yrs at 55°C Electrolytic Capacitor
- ▪️ High Capacitance Density: Rubycon’s aluminum electrolytic capacitors offer high capacitance per unit volume, making them ideal for compact designs. This allows for efficient energy storage in power supplies and smoothing circuits
- ▪️ Excellent Reliability: With over 70 years of manufacturing expertise, Rubycon capacitors are known for long operational life and stable performance. They undergo rigorous quality control and meet strict reliability standards for industrial and consumer electronics
- ▪️ Strong Temperature Characteristics: These capacitors maintain stable performance across a wide temperature range. Their temperature resilience ensures consistent operation in demanding environments like industrial systems
- ▪️ Low ESR and Impedance: Rubycon’s advanced designs result in low equivalent series resistance (ESR) and impedance, which improves efficiency and reduces heat generation. This is especially beneficial in high-frequency applications
Compare candidate parts across the requirements that determine whether they will work in the circuit:
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- Capacitance and voltage rating, including the margin the circuit requires.
- Ripple-current capability and the heating expected in operation.
- Operating-temperature range and lifetime rating.
- Package, lead spacing, polarity, and physical clearance.
- Regulator stability, damping, and other circuit-behavior requirements.
Specific acceptable limits must come from the circuit documentation and the candidate datasheets. ESR and impedance vary with frequency and temperature, while package-related ESL and stability effects can also matter; a technology label or generic “low ESR” description is not enough to establish suitability.
Quick Recap
Best Value
- 🔴 1000uF 35V 12.5x20mm Rubycon Electrolytic Capacitor 🟠 ESR 0.041Ω at 20°C, 100kHz, ESR 0.14Ω at -10°C, 100kHz, 🟡 Ripple Current 1900mA/105°C, 🟢 10000hrs at 105°C, 36yrs at 55°C Electrolytic Capacitor
- ▪️ High Capacitance Density: Rubycon’s aluminum electrolytic capacitors offer high capacitance per unit volume, making them ideal for compact designs. This allows for efficient energy storage in power supplies and smoothing circuits
- ▪️ Excellent Reliability: With over 70 years of manufacturing expertise, Rubycon capacitors are known for long operational life and stable performance. They undergo rigorous quality control and meet strict reliability standards for industrial and consumer electronics
- ▪️ Strong Temperature Characteristics: These capacitors maintain stable performance across a wide temperature range. Their temperature resilience ensures consistent operation in demanding environments like automotive or industrial systems
- ▪️ Low ESR and Impedance: Rubycon’s advanced designs result in low equivalent series resistance (ESR) and impedance, which improves efficiency and reduces heat generation. This is especially beneficial in high-frequency applications
Rank #4
- 🔴 470uF 35V 10x16mm Rubycon Electrolytic Capacitor 🟠 ESR 0.062Ω at 20°C, 100kHz, ESR 0.25Ω at -10°C, 100kHz, 🟡 Ripple Current 1210mA/105°C, 🟢 10000hrs at 105°C, 36yrs at 55°C Electrolytic Capacitor
- ▪️ High Capacitance Density: Rubycon’s aluminum electrolytic capacitors offer high capacitance per unit volume, making them ideal for compact designs. This allows for efficient energy storage in power supplies and smoothing circuits
- ▪️ Excellent Reliability: With over 70 years of manufacturing expertise, Rubycon capacitors are known for long operational life and stable performance. They undergo rigorous quality control and meet strict reliability standards for industrial and consumer electronics
- ▪️ Strong Temperature Characteristics: These capacitors maintain stable performance across a wide temperature range. Their temperature resilience ensures consistent operation in demanding environments like automotive or industrial systems
- ▪️ Low ESR and Impedance: Rubycon’s advanced designs result in low equivalent series resistance (ESR) and impedance, which improves efficiency and reduces heat generation. This is especially beneficial in high-frequency applications
Rank #3
- 🔴 100uF 16V 5x11mm RADIAL LEAD ALUMINUM ELECTROLYTIC CAPACITORS 🟠 ESR 0.4Ω at 20°C, 100kHz, ESR 1.2Ω at -10°C, 100kHz, 🟡 Ripple Current 250mA/105°C, 🟢 10000hrs at 105°C, 36yrs at 55°C Electrolytic Capacitor
- ▪️ High Capacitance Density: Rubycon’s aluminum electrolytic capacitors offer high capacitance per unit volume, making them ideal for compact designs. This allows for efficient energy storage in power supplies and smoothing circuits
- ▪️ Excellent Reliability: With over 70 years of manufacturing expertise, Rubycon capacitors are known for long operational life and stable performance. They undergo rigorous quality control and meet strict reliability standards for industrial and consumer electronics
- ▪️ Strong Temperature Characteristics: These capacitors maintain stable performance across a wide temperature range. Their temperature resilience ensures consistent operation in demanding environments like industrial systems
- ▪️ Low ESR and Impedance: Rubycon’s advanced designs result in low equivalent series resistance (ESR) and impedance, which improves efficiency and reduces heat generation. This is especially beneficial in high-frequency applications
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