In 1952, it was standardized in IEC 62:1952 by the International Electrotechnical Commission (IEC) and since 1963 also published as EIA RS-279. Though known most recently as EIA color code, the four name variations are found in books, magazines, catalogs, and other documents over more than 94 years. Over many decades, as the organization name changed (RMA, RTMA, RETMA, EIA) so was the name of the code. In 1930, the first radios with RMA color-coded resistors were built. In the 1920s, the RMA resistor color code was developed by the Radio Manufacturers Association (RMA) as a fixed resistor coloring code marking. 1945–1950īefore industry standards were established, each manufacturer used its own unique system for color coding or marking their components. Different codes are used for wire leads on devices such as transformers or in building wiring. A separate code, the 25-pair color code, is used to identify wires in some telecommunications cables. Color code to indicate values of electronic componentsĪ 2260 Ω, 1%-precision resistor with 5 color bands ( E96 series), from top, 2-2-6-1-1 the last two brown bands indicate the multiplier (×10) and the tolerance (1%).Īn electronic color code or electronic colour code (see spelling differences) is used to indicate the values or ratings of electronic components, usually for resistors, but also for capacitors, inductors, diodes and others.
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