Resistor E Series

Introduction to the E-Series Standard Resistor Values

The E-series is an internationally recognized system of preferred numbers used to specify standard resistor values, established by the International Electrotechnical Commission (IEC 60063). This standardization ensures consistent component availability across manufacturers and simplifies circuit design by providing a logarithmically distributed range of values.

Each series (E3, E6, E12, E24, E48, E96) represents a different tolerance class, with the number indicating how many values exist per decade. For instance, the E12 series contains 12 values between 10 and 100, corresponding to a ±10% tolerance. Higher series numbers provide finer resolution for precision applications, while lower series are suitable for general-purpose designs where exact values are less critical.

When designing electronics, it is important to choose values commonly used. The E-Series helps with that!