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I see some SMT wire wound inductors are named like 3R3 or 4R5, much like a resistor, why so? I expected them to be like 4H5.

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The "R" in the value doesn't stand for "resistance", it stands for "radix point". This makes the designation language-/localization-independent, since different regions use different symbols for the radix point, e.g. ".", ",", etc.

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  • \$\begingroup\$ That's one I would have never figured out haha I was thinking about something related to impedance, but not this \$\endgroup\$ – mFeinstein Nov 15 '13 at 1:58

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