While the E12 series is the most common, other series are also available. All of these values can be powers of ten (1.2 – 12 – 120, etc.). Because of this, all resistors with a tolerance of 10% overlap. Thus, every value is 21% or 1.21 times higher than the previous value in the series, rounded to whole numbers.
E12 means that every decade (0.1-1.0, 1-10, 10-100, etc.) is divided in 12 steps on a logarithmic scale. To understand the E-series sets of preferred values, we will examine the E12 in detail. Power ratings of resistors are not defined in a norm, and, therefore, often deviate from the above described series. Example include the standard sizes for resistors and the marking of resistors with color codes or numerical codes. By using standard values, resistors from different manufacturers are compatible for the same design, which is favorable for the electrical engineer.Īside from the preferred values, many other standards related to resistors exist. This helps the supplier to limit the number of different values that have to be produced or kept in stock. When manufacturers produce resistors with different resistance values, these end up approximately equally spaced on a logarithmic scale. The standardization of resistor values serves several important purposes. The preferred values for resistors were established in 1952, but the concept of the geometric series was previously introduced by army engineer Renard in the 1870s. These standard values are also valid for other components like capacitors, inductors and Zener diodes. These are referred to as "preferred values" or "E-series", and they are published in standard IEC 60063:1963. On SMD ceramic capacitor there is no marking or numbering you have to measure it using capacitance meter.In 1952, the IEC (International Electrotechnical Commission) decided to define the resistance and tolerance values into a norm, to ease the mass manufacturing of resistors. from below table value of capacitor can be known.
Common resistor values code#
Standard Resistor Values Standard Resistor Values (±5%)Ĭeramic capacitor have EIA or IEC code on it. Power ratings of resistors are not defined in a norm, therefore often is deviated from the above described series. An example is standard sizes for resistors, or the marking of resistors with color codes or numerical codes. By using standard values, resistors of different manufacturers are compatible for the same design, which is favorable for the electrical engineer.Īside from the preferred values, many other standards related to resistors exist.
The preferred values for resistors were established in 1952, but the concept of the geometric series was already introduced by army engineer Renard in the 1870s. These are referred to as preferred values or E-series, and they are published in standard IEC 60063:1963. In 1952 the IEC (International Electrotechnical Commission) decided to define the resistance and tolerance values into a norm, to ease the mass manufacturing of resistors. Standard base resistor values are given in the following tables for the most commonly used tolerances (1%, 2%, 5%, 10%), along with typically available resistance ranges. Resistors and Capacitors are types of passive electronic components. The basic unit of resistance is the ohm (Ω) and capacitance is Farad.
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