Passive Electronic Component Handbook Pdf

12/4/2017by
Passive Electronic Component Handbook PdfPassive Electronic Component Handbook Pdf

A 100 kΩ, 5% axial-lead resistor The electronic color code is used to indicate the values or ratings of electronic components, usually for, but also for,, and others. A separate code, the, is used to identify wires in some cables.

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The electronic color code was developed in the early 1920s by the (RMA), later the (RETMA), now part of the (EIA) Therefore, the code was known as RMA, RTMA, RETMA or EIA color code. In 1952, it was standardized in by the (IEC) and since 1963 also published as EIA RS-279. Originally only meant to be used for fixed resistors, the color code was extended to also cover capacitors with.

The code was adopted by many national standards like (1973), (1974) and (1976). The current international standard defining marking codes for resistors and capacitors is and. (In addition to the color code, these standards also define a for resistors and capacitors.) Colorbands were used because they were easily and cheaply printed on tiny components. However, there were drawbacks, especially for people. Overheating of a component or dirt accumulation, may make it impossible to distinguish brown from red or orange. Advances in printing technology have now made printed numbers practical on small components. Where passive components come in packages, their values are identified with printed alphanumeric codes instead of a color code.

A 0000, 1% precision resistor with 5 color bands (), from top 2-2-6-1-1; the last two brown bands indicate the multiplier (×10), and the 1% tolerance. The larger gap before the tolerance band is somewhat difficult to distinguish.

To distinguish left from right there is a gap between the C and D bands. • band A is the first significant figure of component value (left side) • band B is the second significant figure (some precision resistors have a third significant figure, and thus five bands). • band C is the decimal multiplier • band D if present, indicates tolerance of value in percent (no band means 20%) For example, a resistor with bands of yellow, violet, red, and gold has first digit 4 (yellow in table below), second digit 7 (violet), followed by 2 (red) zeros: 0000 ohms. Gold signifies that the tolerance is ±5%, so the real resistance could lie anywhere between 0000 and 0000 ohms. Resistors manufactured for military use may also include a fifth band which indicates component failure rate (); refer to -199 for further details.

Tight tolerance resistors may have three bands for significant figures rather than two, or an additional band indicating, in units of /. All coded components have at least two value bands and a multiplier; other bands are optional. A, marked with a single black band Resistors use for their specific values, which are determined by their. These values repeat for every decade of magnitude: 6.8, 68, 680, and so forth. In the the values are related by the 24th root of 10, while are related by the 12th root of 10, and E6 series by the sixth root of 10. The tolerance of device values is arranged so that every value corresponds to a preferred number, within the required tolerance. Are made as lengths of wire wrapped in a resistor-shaped body which can be substituted for another resistor value in automatic insertion equipment.

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