Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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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Why do some devices use electrolytic capacitors instead of ceramics for small value components?

I've recently run into a number of consumer-grade devices that use 50v, 0.22uF electrolytic capacitors, as well as other similarly rated parts, all below about 10uF. In use, the voltages on them are far less than the rating, usually around ~15-25V…
ZetaSyanthis
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ESR and ESL, small package vs large (SMD)

I was wondering if someone could explain why larger package capacitors (1210) are supposed to have more ESL and ESR than a smaller - say 0603 package? I would imagine the larger package is still essentially many 0603 equivalents in parallel for a…
user8040
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What is making my DC/DC converter's capacitor to blow up?

I'm having some capacitors blown up and I am not sure what's the cause of this. It is definitely NOT OVERVOLTAGE and NOT in WRONG POLARIZATION. Let me introduce the scenario: I have designed a double cascaded Boost converter using this scheme: Vout…
KenshinARG
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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 page 2 of this datasheet for a Murata 10nF ceramic…
John M
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How does ESR affect cutoff frequency calculations for capacitors?

I'm interested in estimating the cutoff frequency of a capacitor in a simple RC circuit. Since the capacitor and resistor are in series, can I simply add the ESR value to the resistor value? For example, if the ESR is 0.5Ω and my load is 1kΩ, then…
SetchSen
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ESR and parallel capacitors

Just wanting to clarify my understanding of ESR here, because I'm not fully sure if it should be modeled the way I would think to model series resistance. Or if it's more complex than that. Basically the question comes down to is there any reason…
ElecEnthusiast
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Why do capacitor datasheets avoid directly giving the ESR value?

Most datasheets give a parameter called "loss tangent" instead of directly giving the ESR value. Why don't they just give a numeric value for it? Why is loss tangent preferred over ESR? Is there something that prevents giving the ESR, like it is…
hkBattousai
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How to find ESR in capacitor datasheet?

I am looking at the datasheet for a relatively ordinary looking aluminum electrolytic capacitor. I cannot find any place in this datasheet that specifies the ESR of the capacitor. Is it normal for a capacitor datasheet not to specify ESR? Or is…
jemalloc
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Are tantalums good for PIC Vcap?

I understand that ceramics are good at ESR but would like to know if tantalum would suffice for my application. Some 16 bit PICs require a >4.7uf cap (10uf recommended) low ESR cap for their internal regulator. The datasheet doesn't specify the type…
Chetan Bhargava
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Modelling Capacitor Leakage

I have a 680uF electrolytic capacitor rated for 25 volts. Yesterday night I was curious as to how much current leaked out of it over time, so I charged it with a generic DC power supply, and measured the voltage across the two terminals. The voltage…
hedgepig
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Calculating the ESR of Capacitor

I try to calculate the ESR of a capacitor. I checked this datasheet: http://www.farnell.com/datasheets/2245214.pdf?_ga=2.167304311.817060034.1534770853-676261198.1531404202 I can see from the datasheet for the Aluminum Polymer Capacitors that they…
George A
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Why does ceramic capacitor ESR change with frequency?

In most datasheets, I see a typical table which shows that ESR of ceramic capacitor changes with frequency. I understand that impedance of every kind of capacitor must have a minimum due to its inevitable serial inductance. But I don't understand…
hkBattousai
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How is ESR specified on ceramic capacitors?

I'm looking for a capacitor to use as the output capacitor with the LDO regulator SP6205EM5-L-3-3. It says it requires a 2.2 µF capacitor, with an ESR less than 0.5 ohm. I've found the TCJA106M010R0300 type of tantalum capactior would…
James
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ESR meter: Are in-circuit readings accurate?

I recently bought one of these ESR meters, a 'MESR-100': http://www.amazon.com/MESR100-AutoRanging-Circuit-Capacitor-Tester/dp/B00G7OPBP2 It claims to be able to test capacitor ESR with the caps left in-circuit. It appears to work well from my…
UpTheCreek
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What is the difference between ESR and DCR?

I am measuring the inductance of a large coil using an LCR meter. I am using the series equivalent measurement mode at 100 Hz. Why does the LCR meter show that the ESR is 656 Ohm and why does my multimeter show a DC resistance of 61.5 Ohm? I would…
Rens
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