Technical FAQs 4

Can a rated voltage be applied across a Rhom resistor?

Do not apply a voltage exceeding the rated voltage across any RHOM resistors. *2: Rated Voltage(V) Rated Power(W) Nominal Resistance( Ω) = × or the limiting element voltage, whichever smaller, is the rated voltage. ○ 2012 ROHM Co., Ltd. All rights reserved.

What is an E series resistor?

An E series resistor, also known as the E series, is an international standard established by the International Electrotechnical Commission (IEC). This application note provides a list of nominal resistance values and an overview of the standards, including the marking codes for resistor values.

Why should resistor values be standardized?

The standardization of resistor values serves several important purposes. When manufacturers produce resistors with different resistance values, these end up approximately equally spaced on a logarithmic scale. This helps the supplier to limit the number of different values that have to be produced or kept in stock.

When were resistor values established?

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. The standardization of resistor values serves several important purposes.

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