Instead Resistors are made in a restricted range of values and each value is quoted as a specific number of ohms plus or minus a percentage of the quoted value, this range of possible values is called the tolerance of the resistor. By having these standard resistor values, electronic components from a variety of manufacturers can be chosen, making sourcing much easier and the cost of the components much less.

For a better experience, please enable JavaScript in your browser before proceeding. Equally they can be scaled down by adding a decimal point to give fractions of ohms. These preferred values are based on a geometric series, commonly known as the E series. One example where values can be kept within the E3 series occurs with digital design where a pull-up or pull-down resistor is needed.

E48 2% tolerance. The theoretical values obtained from the series are rounded to three significant digits. Note that to avoid misreading of the decimal point, the above values will sometimes be written, both on components and in technical literature, using the BS1852 notation; The E ranges of resistors are specified by the Electronic Industries Association (EIA) with each range having its own specified tolerance, which in turn gives the required number of values to cover each decade. Carbon types are rarely available these days and in any case, would only available in the lower tolerance ranges as their values cannot be guaranteed to such a close tolerance. In this way a preferred value of 47 in the decade range may represent (multplying or dividing by ten); .47Ω 4.7Ω 47Ω 470Ω 4.7KΩ 47KΩ 470KΩ 4.7MΩ etc.

The E series defines capacitance and resistance values as well as tolerances for capacitors and resistors. E48, E96, E192 --- E48 and E96 are subsets of E192. on Standard Resistor Values: E3, E6, E12, E24, E48, E96 and AMP, Semiconductor Definition – Properties, Types and More, Half-Wave Rectifier: Working principles and Applications. It avoids using the point (.)

10 11 12 13 15 16 18 20 22 24 27 30 33 36 39 43 47 51 56 62 68 75 82 91. In most electronic systems, complex combinations of capacitors are used to meet the specific requirements of a circuit. Find (EEE) components/parts products and datasheets from hundreds of manufacturers.

This method can be used of course over a much wider range of values … How likely is it that you will recommend our website to a friend or colleague? 1.0 kΩ. The Electronic Industries Association (EIA), and then statued by IEC publication 60063, specify standard values for resistors, sometimes referred to as the "preferred value" system. 100 k, 150 k, 220 k, 330 k, 470 k, 680 k. 10 , 12 , 15 , 18 , 22 , 27 , 33 , 39 , 47 , 56 , 68 , 82 . The E24 sequence (or any other E sequence) can be scaled up by adding a number of zeros for K (Kilohms) or M (Megohms) after the value. E96 + E24. Also, the E192 series is used for 0.25% and 0.1% tolerance resistors too. The full range of standard component values consists of decimal multiples and sub-multiples of E192, E96, and E48 values provided in Table 1. E24 – 5% tolerance E48 – 2% tolerance E96 – 1% tolerance E192 – 0.5, 0.25, 0.1% and higher tolerances The number following the "E" specifies the number of logarithmic steps per decade and each step is the difference by tolerance (%). Eight of the E24 values do not match the following formula. IEC 63:1963 (aka IEC 60063:1963), second edition, published 1963-01-01. The preferred number series produces a spacing that relates component values to their tolerances. Home. The standard resistor values are organised into a set of series of values known as the E-series. How easy was it to find what you were looking for on our website?

After studying this section, you should be able to: • Describe different classes of resistor according to the EIA Preferred Value System.

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