Skip to main content
Electrical Engineering

Return to Answer

added 363 characters in body
Source Link
D.A.S.
D.A.S.
  • 148k
  • 3
  • 56
  • 190

I computed Xc(f) after your component specs.

\$Zc(f)= R(f) - jXc(f) ~~~~,~~Xc(f)= 1/\omega C\$

The important thing to learnI use R(f) since ESR is that DFfrequency sensitive and tanδ does not predictionis mainly a percentage of dielectric impedance well below SRF and called "dielectric loss" then above SRF, it is the ESR performanceloss of the inductive electrodes with skin effects.

The lowest impedance is at 100kHzthe series resonant frequency and the shape of the "notch" like shape is due to the Q factor which is somewhat inverse to tan δ.   

So if you see caps with onlyThe important thing to learn is that DF or tanδ at 100 or 120 Hz then you cannot guess the ESR at high frequency and most likely,tan(δ) does not a lowpredict the ESR typeperformance at 100kHz.

So if you see caps with only DF or tan(δ) then you cannot guess the ESR at high frequency and most likely, not a low ESR type.**

Volt   uF   tanδtan(δ)  ESR (100kHz)  Xc(100Hz) Xc(100kHz)  Zc
 16V 220μF   0.12  0.022         723       0.723      0.723
 16V 270μF   0.15  0.012         589       0.589      0.590

If you compare aspect ratios, you will find e-caps have lower ESR with taller cylindrical shapes and higher voltage ratings when volume and C(uF) are aboutin the same type.

I computed Xc(f) after your component specs.

\$Zc(f)= R(f) - jXc(f) ~~~~,~~Xc(f)= 1/\omega C\$

The important thing to learn is that DF and tanδ does not prediction the ESR performance at 100kHz.  So if you see caps with only DF or tanδ at 100 or 120 Hz then you cannot guess the ESR at high frequency and most likely, not a low ESR type.

Volt   uF   tanδ  ESR (100kHz)  Xc(100Hz) Xc(100kHz)  Zc
 16V 220μF   0.12  0.022         723       0.723      0.723
 16V 270μF   0.15  0.012         589       0.589      0.590

If you compare aspect ratios, you will find e-caps have lower ESR with taller cylindrical shapes and higher voltage ratings when volume and C(uF) are about the same.

I computed Xc(f) after your component specs.

\$Zc(f)= R(f) - jXc(f) ~~~~,~~Xc(f)= 1/\omega C\$

I use R(f) since ESR is frequency sensitive and is mainly a percentage of dielectric impedance well below SRF and called "dielectric loss" then above SRF, it is the loss of the inductive electrodes with skin effects.

The lowest impedance is at the series resonant frequency and the shape of the "notch" like shape is due to the Q factor which is somewhat inverse to tan δ. 

The important thing to learn is that DF and tan(δ) does not predict the ESR performance at 100kHz.

So if you see caps with only DF or tan(δ) then you cannot guess the ESR at high frequency and most likely, not a low ESR type.**

Volt   uF   tan(δ)  ESR (100kHz)  Xc(100Hz) Xc(100kHz)  Zc
 16V 220μF   0.12  0.022         723       0.723      0.723
 16V 270μF   0.15  0.012         589       0.589      0.590

If you compare aspect ratios, you will find e-caps have lower ESR with taller cylindrical shapes and higher voltage ratings when volume and C(uF) in the same type.

Source Link
D.A.S.
D.A.S.
  • 148k
  • 3
  • 56
  • 190

I computed Xc(f) after your component specs.

\$Zc(f)= R(f) - jXc(f) ~~~~,~~Xc(f)= 1/\omega C\$

The important thing to learn is that DF and tanδ does not prediction the ESR performance at 100kHz. So if you see caps with only DF or tanδ at 100 or 120 Hz then you cannot guess the ESR at high frequency and most likely, not a low ESR type.

Volt   uF   tanδ  ESR (100kHz)  Xc(100Hz) Xc(100kHz)  Zc
 16V 220μF   0.12  0.022         723       0.723      0.723
 16V 270μF   0.15  0.012         589       0.589      0.590

If you compare aspect ratios, you will find e-caps have lower ESR with taller cylindrical shapes and higher voltage ratings when volume and C(uF) are about the same.