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 Ohms, as is customary?

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# Capacitor Impedance – ESR vs Frequency Curve Explained

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capacitoresrimpedance

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 Ohms, as is customary?

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## Best Answer

W just means \$\Omega\$, so Ohms.

The small letter omega: \$\omega\$ looks a bit like a "w".

It is possible that a "W" was typed at the Y-axis of the graph but that this wasn't converted into the Greek character \$\Omega\$ when the pdf file was made.