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How do I know if a Capacitor is Low ESR

 
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koossa



Joined: 16 Oct 2005
Posts: 1

PostPosted: Sun Oct 16, 2005 3:13 pm    Post subject: How do I know if a Capacitor is Low ESR Reply with quote

Good day

I have asked for low ESR Electrolytic Capacitors, and they gave me the following 3 types :
http://www.hitano.com.tw/PDF/EXR.pdf
http://www.hitano.com.tw/PDF/E5R.pdf
http://www.hitano.com.tw/PDF/EHR.pdf

How do I know if they are low esr?
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Ry
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PostPosted: Mon Oct 17, 2005 11:21 pm    Post subject: Reply with quote

ESR is rather complex & dependent on several different factors (ie voltage, operating freq, construction..etc) and may not be readily listed. However as a rule of thumb it is directly related to "dissipation factor" which by itself is variable.

Therefore in general terms, the higher dissipation factor means higher ESR.
but again, it is still very much dependent on your design/application needs.

Technically speaking, ESR of a cap can be calculated by

ESR = Dissipation factor x (2 x TT x f x C) to the -1 factor
f is operating frequency
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PostPosted: Thu Oct 27, 2005 9:43 am    Post subject: Reply with quote

E5R are short capacitors (5mm high) for use in small devices. (Pg 18,)
EHR are high temperature longlife capacitors. (pg 16, 17)
EXR are low impedance and long life. They are also the only datasheet that lists the impedance at 100KHz. They are for switching power supplies and other high frequency applications. Sometimes they are brown in colour. (Pg 23, 24, 25, 26)
This info was taken from the data sheets you posted. (except colour)
Low ESR = low impedance.

Let us know if this is of any help. Very Happy
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