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Preferred number series for resistors and capacitors
The preferred number series for resistors and capacitors are standardized sets of values used to ensure compatibility and coverage in electronic components.
The most commonly used preferred number series include:
These series are based on geometric progression and are recommended by international standards such as IEC and ANSI to ensure consistency and ease of selection in circuit design.
IEC 60063:2015 provides series of preferred values for the resistance of resistors and for the capacitance of capacitors.
The definition of such series with a defined numeric resolution is a basic prerequisite for the marking and coding of capacitors and resistors with their respective capacitance or resistance values as described in IEC 60062.
This edition includes the following significant technical changes with respect to the previous edition:
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