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?
Capacitor Impedance – ESR vs Frequency Curve Explained
capacitoresrimpedance
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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.