# Questions tagged [esr]

ESR is the "equivalent series resistance" of an electrical component (such as a capacitor or inductor) arising from non-idealities that are always present in the materials used in their construction.

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### What is the Dissipation Factor of a capacitor useful for in its direct form?

Why do electrolytic capacitor makers provide the low frequency ESR in the form of a dissipation factor (DF) instead of an Ohms value as they do for higher frequency. The DF is rather unwieldy and I ...
• 22.5k
1 vote
777 views

### Following is an excerpt from a power electronics textbook. Is the statement true?

As far as I know ESR primarily depends on the type of dielectric. eg: Al electrolytic (higher capacitance value) would have much higher ESR than ceramic (usually lower capacitance value). Say for ...
• 3,032
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### Modelling ESR of a parallel plate capacitor

I am trying to model a parallel plate capacitor (on die capacitor generated using metal plates.) I know the capacitance per unit area, and metal sheet resistance. No knowledge of the dielectric. I ...
73 views

### Problem in capacitor selection

The SIM800L datasheet suggesting a low ESR capacitor for providing a 2 ampere burst current during data transmission. According to this site MLCC provides the lowest ESR at high-frequency application, ...
• 2,519
292 views

### Equivalent series resistance vs. parallel leakage conductance

I am studying a book called RF Circuit Design by Reinhold Ludwig and Gene Bogdanov (2nd Edition). In the first chapter on capacitors, they introduce the loss tangent and equivalent series resistance, ...
• 135
1k views

### Typically, do same-sized SMD ceramic capacitors with different capacitance have different ESR?

I know that depending on the dielectric, the technology, the company etc, but typically, if say two SMD ceramic capacitors are the exact same size (also of the same technology if you wish,) and their ...
798 views

### Powering microcontroller with a capacitor

I have a ESP32-SOLO-1 microcontroller mounted on a moving part of a machine which moves in a circle. The idea is to power it with a capacitor and then charge the capacitor in a fixed location when the ...
213 views

### Estimation of Electrolytic Capacitor ESR at SMPS Frequencies

While working on compensation networks or ripple calculations, it helps to know the ESR for my output capacitors. In high voltage SMPS systems, this seems to be difficult for the following reasons: ...
• 3,536
190 views

### Do touchstone (s2p) files for capacitors from include the ESR/ESL, or do I need to add an ideal R/L for simulation?

Manufacturers like muRata and AVX provide .s2p files for their RF capacitors. When modeling for simulation in my EDI software, do I need to include the ESR graphed in the datasheet for the frequency ...
• 2,190
149 views

### Supercapacitor as PMIC Storage Element

I'm currently trying to design a system that incorporates an ADP5092 which can use a supercapacitor as the storage element but I am also considering other similar PMIC chips so this is more for ...
276 views

### Capacitors: 200 mOhm ESR @ 100 Hz, attainable?

The MLCCs in 0805 case seem to have one or two orders of magnitude higher ESRs at that frequency. Are there any such low ESR caps out there, preferably 0805 MLCC but not compulsory? It is a 220 nF cap ...
• 1,061
1 vote
286 views

### Capacitor ESR Calculation

I'm trying to perform esr calculations of this capacitor(1uF): https://alconelectronics.com/wp-content/uploads/2020/06/KP-6-JUNE-2019.pdf to do that I need to know dissipation factor and at the bottom ...
• 319
2k views

### State-space average model of non-ideal buck converter

I've been learning power electronics and am trying to design a dual-switch forward converter. One of the things I've been trying to do is derive the small-signal equivalent circuit of the non-ideal ...
34 views

### Is there a reliable way to read an in-circuit capacitor? [duplicate]

Is there a reliable way to read an in-circuit capacitor? I have a PCB-type ESR meter with a zero-force insertion socket that works for components, but do not have a meter that was designed to read ...
• 135
175 views

### Buck Converter Capacitor and Inductor Characteristics

I'm trying to make a buck converter with this mickey-mouse MC34063A chip that will step-down +5V to +3V3 up to 500 milliamps. I've gone through the calculations by hand and validated them with an ...
• 197
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### Difference between "|Z|" and "Resistance" in capacitor datasheet?

I'm shopping for capacitors, and I expect good capacitor datasheets to have a graph of |Z| (the magnitude of the capacitor's impedance) as a function of frequency. I was confused when I looked at ...
• 1,439
787 views

### Capacitor Impedance ESR vs Frequency Curve

Yageo's SMT capacitor datasheet lists the ESR vs. Frequency Curve show below: Note that impedance (Z) is listed in units (W). How can this be understood? Why is impedance seemingly not measured in ...
• 33
103 views

### Strange Behaviour of Lipo Battery ESR during charging

I performed three charge tests on a single cell 190mAh Li-Po battery with Keithley Battery Simulator instrument. Charging started at 3V and stopped at 4.20V in all tests. After completing the three ...
• 382
300 views

### Low ESR capcitors for switching pre-regulator (LM2596)

In LM2596 switching regulator datasheet suggested to use low ESR capacitors. since I'm going to use LM2596 as a pre-regulator for a linear regulator to reduce the voltage drop on linear regulator, is ...
• 2,406
1 vote
758 views

### Bulk Capacitor Ripple Current as a Function of Capacitance

When you have a bulk capacitor on a time varying load, what is the relationship between the capacitance of the bulk capacitor, the ESR of the bulk capacitor and the ripple current through the bulk ...
• 315
3k views

### How to convert capacitor impedance to ESR?

I select an output capacitor for a DC / DC converter (LM2596), it is said that it needs a high ESR (50-60mOhm). In the characteristics of electrolytic capacitors there is no given value, but there is ...
• 535
1 vote