Resistor E Series: E3, E6, E12, E24, E48, E96 Values
- chart and tables of standard or common resistor values in the E3, E6, E12, E24, E48, E96 ranges.
The EIA preferred values can be summarised in tabular form to give the different values within each decade. These values are the common resistor values that are used throughout the electronics industry.
When designing equipment, it is good practice to keep to the lowest E-series section, i.e. it is better to use E3 rather than E6. In this way the number of different parts in any equipment can be minimised. If decade values, i.e. 100R, 1K, 10, etc can be used so much the better. These are very common resistor values and ore widely used. It also reduces the variety of components and makes inventory more manageable.
For many digital designs where the resistor is used as a pull up or pull down, the resistor value is of little consequence and this is easy. For analogue designs it is a little more complicated, and E12, or E24 values are needed. E48, E96 or even E192 series values are needed for high accuracy and close tolerance requirements.
As the higher order series are used less, their costs are also normally higher. Using common resistor values can reduce costs as well as reducing inventory.
Resistor E series tables of values
Below are the common resistor values. They are the standard E3, E6, E12, E24, E48 and E96 resistor values.
|E3 Standard Resistor 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.
|E6 Standard Resistor Series|
The E6 series resistor values are also widely used within the industry. They provide a wider range of common resistor values that can be used.
|E12 Standard Resistor Series|
|E24 Standard Resistor Series|
|E48 Standard Resistor Series|
|E96 Standard Resistor Series|
Virtually all resistors that are available fall into the standard resistor values that are given in the table above. Although resistors are specified up to the E96 series, for most applications a comparatively few number of resistor values is needed. By choosing from E3 or E6 series of standard resistor values, and not going to some of the higher order series, it can reduce the stock holding as there is a greater chance the same values may be used elsewhere in a design. Only where close tolerance types are required should resistors from the E24, or even E48 or E96 series of standard resistors should be used.
By Ian Poole
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