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Standard Resistor Values | E3 E6 E12, E24, E48 Series | Electronics Notes

Resistor E series The EIA preferred values or standard resistor values can be summarised in a tabular form to give the different values within each decade. Current resistor technology enables very close tolerance levels to be achieved, yet there is still a great benefit in using resistors even from the E3 series. The table below is normalized for the decade between and 1, Resistor E series tables of values Below are the common resistor values.

Archived from the original on The preferred value system has its origins in the early years of the last century at a time when most resistors were carbon-graphite with relatively poor manufacturing tolerances. The resistance of this component at the bottom of its tolerance band is 1. E series of standard resistor values The standard resistor values are organised into a set of series of values known as the E-series.

The E3 series resistors are the most widely used and hence these values will be the most common resistor values used within the electronics industry. E3 Standard Resistor Series 1.

Take then a resistor with a value of 1. In any event, one should be aware of these practices to avoid confusion.

E series of preferred numbers – Wikipedia

Archived PDF from the original on Over time, components evolved towards common values, then based on some of these existing conventions, the International Electrotechnical Commission IEC began work on an international standard in The EIA preferred values or standard resistor values can be summarised in a tabular form to give the different values within each decade.


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. The EIA Electrical Industries Association which is based in North America is one organisation that has adopted the system and as a result the resistor value series are often referred to as the EIA standard resistor values.

The E series preferred or standard resistor value ranges are internationally accepted and have been adopted by international standards organisations. It consists of the E3E6E12E24E48E96 and E series, where the number after the ‘E’ designates the quantity of value “steps” in each series.

The actual resistance at the top of the tolerance band is 1.

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If a manufacturer sold resistors with E3 series values in a range of 1 ohm to 10 megohms, then the available resistance values would be: Wikimedia Commons has media related to E12 values.

Occasionally E24, E48, E96 or even E series values may needed for high accuracy and close tolerance requirements. More accurate tolerances are available for some resistors, but these are not as widely available and costs are higher.

Below are the common resistor values. The exact value is of little is of little consequence and the value can be maintained within the E3 series. E6 Standard Resistor Series 1. By having these standard resistor values, components from a variety of manufacturers can be chosen, making sourcing much easier and the cost of the components much less.

The E6 series resistor values are also widely used within the industry. This page was last edited on 1 Novemberat Retrieved from ” https: The values in any decade can be derived by merely dividing or multiplying the table entries by powers of It should be noted that some values in the E24 series don’t exist in E48 to E series.

From Wikipedia, the free encyclopedia. As transistor radio production migrated towards Japan during the s, it was critical for reihd electronic industry to have international standards. The Electronic Industries Association EIAand other authorities, specify standard values for resistors, sometimes referred to as the “preferred value” system. This process is followed through for all the values in a decade, creating a set of standard resistor values for each tolerance.


Also, the E series is used for 0. Later, the post—World War II baby boom and the invention of the transistor kicked off demand for consumer electronics goods during the s.

In the early 20th centurycapacitor previously called condenser [1] [2] and resistor [3] [4] value increments were different than today. The series are as follows: The EIA “E” series specify the preferred values for various tolerances. The number following the “E” specifies the number of logarithmic steps per decade.

Other types of electrical components are either specified by the Renard series for example fuses or are defined in relevant product standards for example IEC for wires. For analogue designs it is a little more flexibility is often needed, but even E6 or E12 standard resistor values can be used without difficulty in the design. Supplier Directory For everything from distribution to test equipment, components and more, our directory covers it.

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This allows easier purchasing migration between different s24 parts. E12 Standard Resistor Series 1. By using this site, you agree to the Terms of Use and Privacy Policy. The rationale is simple – select values for components based on the tolerances with which they are able to be manufactured.

The different sets of standard resistor values are known by their E-series numbers: E3 has three resistors in each decade, E6 has six, E12 has twelve, and so forth.

However, this is not always the case as can be seen by comparing the E24 and E96 lists.