1996 - 2016
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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Two methods of inductor markings are predominant - EIA (Electronic Industries Association) and Mil-Spec (Military Specification). Both use the standard color-number association familiar with color-coded resistors. The chart and examples below show that a Mil-Spec inductor can be identified by the presence of a double-width silver band at the left edge. Unless specified otherwise by the manufacturer, units are in microhenrys (µH). Mil-Spec inductors - and possibly some EIA types - use a silver or gold band in the multiplier to denote 0.1 and 0.01, respectively.
|Inductor Color Codes
(4-Band EIA and 5-Band Mil-Spec Inductors)
Posted February 9, 2015