This is the maximum voltage that may be continuously applied to the resistor element, see iec publication 1158. The international symbol is a standard rectangular shape, but the us standard has the zigzag line that makes it easy to identify. The values of the e24 series are in accordance with iec publication 63. Examples 4 7 3 2 a 1st digit of the resistors value b 2nd digit of the resistors value c 3th digit of the resistors value. Standard resistance values e96 for use with 1 % tolerance resistors except 0603 package chip resistors the charts above and below may be used to determine the alternate marking coding formula of the 0603 package chip resistors, also found on page 5 part subheading 5. Types of resistors the two main characteristics of a resistor are its resistance, r, in ohms and its power rating, p, in watts. The range of resistance value and tcr of thinfilm chip resistor by kind are shown in fig. System figure of thinfilm chip resistor the range of resistance value and tcr of thinfilm chip resistor by kind are shown in fig. A further surface mount resistor code scheme or smd resistor coding scheme has started to be used, and it is aimed at 1 % tolerance smd resistors, i.
Therefore the eia96 marking system has been created. This is not 100 ohms, but it follows the scheme exactly and it is 10 x 10 0 or 10 x 1 10 three figure smd resistor marking code. Dec, 2017 standard resistor values electronics basictables an introduction to electronics 2 4 colour coding and most common resistor values solved table j 1 standard resistance values resistor v share this. Common resistor and capacitor values for electronic circuits the following are the standard resistor values available in carbon film with a 2 or 5 percent tolerance. More accurate tolerances are available for some resistors, but these are not as widely available and costs are higher. The wattage rating indicates the amount of power the resistor can safely dissipate as heat. These are referred to as preferred values or eseries, and they are published in standard iec 60063. 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. Below are the rules to follow for reading the value of eia96 smd resistors. The resistance, r, provides the required reduction in current or the desired drop in voltage. For example, for e12 has twelve steps between any power. Resistors with values of less than 100 ohms are marked utilise the letter r, as before, to indicate the position of the decimal point. Eia standard resistor values stackpole electronics, inc. The following are the standard resistor values available in carbon film with a 2 or 5 percent tolerance.
The e series is a system of preferred numbers also called preferred values derived for use in electronic components. Smd resistors have a code consisting of three or four number or letters. Round the results to the proper number of significant figures 3 for 1 % and 2%, 2 for 5% and 10%. Excel formula calculates standard 1%resistor values. The eia e number is the number of logarithmic steps. Standard values of nominal resistance are taken from the e24 series for resistors with a tolerance of 5% or 2%. Jul 24, 2012 therefore, the resistor smd code was developed. As an example, a resistor with the value 4r7 would be 4. As the chart at the right shows created in excel, plotting the values on a logarithmic scale results in a straight line. System figure of thinfilm chip resistor low resistance value 1. Common resistor and capacitor values for electronic circuits.
Type or electronically paste the text below into any cell other than a1. You can use the calculator below to calculate the resistance of an smd resistor. This specification may be changed at any time without prior notice. Only when it is possible, shown by four digits or letters.
High pulse load high voltage high power high reliability high frequency low ohmic 1. Standard, professional, precision, semiprecision, and ultra precision product range features resistor solutions for applicationspecific requirements, such as. It consists of the e3, e6, e12, e24, e48, e96 and e192 series, where the number after the e designates the quantity of value steps in each series. To determine values other than the base, multiply the base value by 1, 10, 100, 1k, or 10k. Regardless of the form, both styles have a set of terminals connecting the ends. The excel cell formula below calculates the nearest standard 1 % resistor value without using a lookup table or macro. Standard resistance value is obtained from the above chart by multiplying by powers of 10. Tcr 100 1 % dcrcw e3 rca e3 rcl e3 rcc e3 semiprecision e. By having these standard resistor values, components from a variety of manufacturers can be chosen, making sourcing much easier and the cost of the components. Heres the us resistor left and international resistor right that youll find. Preferred number series for resistors according iec 60063 are indicated below. Standard capacitor values from ipf to 9100uf 10,000 2. In this video you learn in 3 minutes how to read the most common resistor smd codes. See also the smd resistor calculator and a short tutorial on how to read smd resistors.
Smd resistor examples eia96 the following table lists all commonly used smd resistors marked with the eia96 code from 1 ohm to 97. Standard resistor tables based on eia preferred values 0. It establishes standard terms, inspection procedures and methods of test for use in sectional and detail specifications of electronic components for quality assessment or any other purpose. Eia standard resistor values by tolerance% move the decimal point to achieve the actual value desired. Resistor tolerances are generally 20%, 10% 5%, 2% and 1%. Some resistors use colored bands instead of numbers. Standard resistor values are calculated using the simple formula given below. Tcr 50 1 % mm smm mc mc at mcw at acas precision e.
Standard chip resistors rc011121 sizes 1206, 0805, 0603. Capacitors are available in a huge range of package styles, voltage and current handling capacities, dielectric types, quality factors, and many other parameters. 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. This calculator will select the closest standard resistor value, from 1 % 5% or 10% standard eia values, calculates the error, and prints out a table of the standard values for the given tolerance.
The chart above may be used to calculate the standard resistance code for. Higher precision resistors, combined with the decreasing sizes of resistors, have created the need to have a new, more compact marking for smd resistors. Capacitors dual channel transmissive sensor glass protected smd 0603 ntc thermistor features a, package size a. It is based on the e96series, thus aimed at resistors with 1 % tolerance. Standard resistance values are obtained from the decade table by multiplying by powers of 10.
7 858 641 371 115 986 1173 1573 1510 428 645 144 735 293 792 223 541 1309 1070 536 753 1447 1557 1238 341 80 1551 228 609 444 1489 1557 1404 1221 344 1450 688 140 320 189 773