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Hi,

Bottom of page 10 of this gives an equivalent circuit model of an Aluminium electrolytic capacitor...

[URL unfurl="true"]https://www.mouser.co.uk/datasheet/2/447/KEM_A4049_EDH-3316662.pdf[/URL]

They identify "Co" and "Ce". They say Ce=0.01 x Co

Page 1 of this...

[URL unfurl="true"]https://www.we-online.com/components/media/o720421v410%20ANP109a%20EN.pdf[/URL]

...gives a totally different circuit model for an Alu electrolytic cap.

Both articles speak of the "LC" resonant frequency of the El cap, and show it as the "valley"

of the "impednance vs frequency" graph.

The Kemet article says the valley is at w = 1 [SQRT(L x Ce)]

The Wuerth article says the valley is at w = 1/[SQRT(L x Cs)]

These are totally different frequencies. Why is it that Kemet dont appreciate that the ESR pretty well shorts out the Ce?

If you were using each one to determine the ESL, you would come up with different values.