Table 2 lists the standard values of primary interest to amateurs. The eia e number is the number of logarithmic steps. The resistance of resistors often follows the e series. Successive values within a decade series are related approximately by a factor of for the e12 series, for the e24 series, for the e96 series and for the e192 series.
This allows easier purchasing migration between different tolerance parts. Eia standard resistor values stackpole electronics, inc. Resistor e series tables of values below are the common resistor values. Resistors with values of less than 100 ohms are marked utilise the letter r, as before, to indicate the position of the decimal point. The num ber series under the 10 % column is known as the e12 series because there are 12 standard values within a decade range. Resistors are available with ratings from a fraction of an ohm to millions of ohms, but they come in standard values only. These values are generally available in multiples of 0. Instead of using advanced javascript functions that would make the script incompatible with older browsers, i elected to leave the quantization errors. The two first numbers represent a code that indicates a resistance value with three significant digits. In this case, each value is 2% larger than the previous value, yielding 96 values per decade. The electronic industries association eia, and other authorities, specify standard values for resistors, sometimes referred to as the preferred value system.
Standard resistor values are calculated using the simple formula given below. The number 53 indicates the 53rd value of the e96 table 348 and b indicates multiplication by 10. Although there are online tools available for this task, it is often useful to be able to integrate scriptable functions into custom software. The e series is a system of preferred numbers also called preferred values derived for use in electronic components. In the table below the values for each code is given, which are basically the values from the e96. Resistor values are organised into a set of different series of preferred values or standard resistor values. Finding the nearest e96 resistor value in python techoverflow. Resistor color code calculator 3, 4 and 5 band resistors. To determine values other than the base, multiply the base value by 1, 10, 100, 1k, or 10k. 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. As an example, a resistor with the value 4r7 would be 4.
A higher number correlates to a lower tolerance and a higher precision. Led resistor calculator resistor value for leds circuit. The standard e3, e6, e12, e24, e48 and e96 resistor values are listed below. Youll find the values for the e6, e12, e24, e48, e96 and e192 series or preferred resistor values in this table. In this article youll find an interactive table in which you can find the standard resistor values, as used in electronics, and defined by the iec. Constant application of a voltage above the rated voltage will degrade the performance and reliabillity of the resistor.
This quickly answers the question of whether you can use 573. Kitronik ltd how to calculate and understand resistor values resistors a resistor is a device that opposes the flow of electrical current. This specification may be changed at any time without prior notice. Resistor value and ratio calculator nightshade electronics. Since some values in the e24 series do not exist in the e48, e96 and e192 series, resistor manufacturers have added the missing e24 values to some of their 1%, 0. Using standard resistor values can greatly impact the accuracy and predictability of a circuit by eliminating rounding errors incurred at the end of the design. When resistor is to be exposed to a transient load excessive large load,such as pulse, mount the resistor on your product and check the condition and evaluate the result. Jan 02, 20 using standard resistor values can greatly impact the accuracy and predictability of a circuit by eliminating rounding errors incurred at the end of the design. For example some low value 1% resistors are available in e12 only. The rationale is simple select values for components based on the tolerances with which they are able to be manufactured.
The bigger the value of a resistor the more it opposes the current flow. If there is no tolerance band, then find the side that has. Eia standard resistor values by tolerance% move the decimal point to achieve the actual value desired. For standard values used in capacitors, inductors and resistors, click here. That is, resistors are not available for every possible ohmic roundnumber value. To manufacture resistors of every possible value would be impractical. Where resistance values less than ten ohms are used, the letter r is used to indicate the position of the decimal point. Using 10% tolerance devices as an example, suppose that the first preferred value is 100 ohms. Standard electronic decade value tables decade table vishay dale document number 31001 for technical questions, contact. It consists of the e3, e6, e12, e24, e48, e96 and e192 series, where the.
Mox500 series epoxy molded, metal glazemetal oxide resistors features meets milstd202 meets iec 645 up to 2kv molded construction available in e96 values dimensions in. Preferred resistor values the eia e series specify the preferred values for various tolerances. The number following the e specifies the number of logarithmic steps per decade. Each series denotes the number of different values. Two decades of e12 values, which would give resistor values of 1.
Resistor marking surface mount resistor marking vishay. Quantization errors in resistor values are inherent to javascript. When the resistor dissipates power, a temperature rise above the ambient temperature occurs, dependent on the thermal. The usage of a letter prevents the confusion with 3digit marking system.
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. Dcrcw e3 standard thick film chip resistors datasheet pdf. Vishay e96 series resistor kits are available at mouser electronics. So far, we have calculated resistor values and then picked the nearest preferred value. For example, for e12 has twelve steps between any power. These preferred values are derived from an exponential function, so they are known as e series e6, e12, e24 and e96, whose values are given in appendix a. These tiny chips are marked with three 3 or four 4 digit codes which is called smd resistor codes to indicate their resistance values. Use of standard values is encouraged because stocking progr ams are designed around them. Also, the 3rd color for 4band resistors will be blue 10 6 or less and the 4th color for 5 band resistors will be green 10 5 or less, as basic resistor values range from 0. Standard series values in a decade for resistances and. Select the number of bands, then their colors to determine the value and tolerance of the resistors or view all resistors digikey has to offer. All e24 values available in 1% tolerance are also marked with 3. Standard series values in a decade for resistances and capacitances e3 to e192 according to iec 60063 e192 e96 e48 e192 e96 e48 e192 e96 e48 e192 e96 e48 e24 e12 e6 e3 100 100 100 178 178 178 316 316 316 562 562 562 10 10 10 10 101 180 320 569 11 102 102 182 182 324 324 576 576 12 12.
This is a simple online calculator for color band resistor marking, inductor color band marking, ceramic or tantalum capacitor 3 digit marking and smd resistor 3digit, 4digit, 10%, 5%, 2% and eia96 e96 1% tolerance code marking. Standard resistance value is obtained from the above chart by multiplying by powers of 10. Following this logic, the preferred values for 10% tolerance resistors between 100 and 1,000 ohms would be 100, 120, 150, 180, 220, 270, 330 and so on rounded appropriately. There are four more or less commonly used resistor series, with 12, 24, 48, and 96 values per decade, respectively. This table shows all possible values for the 4 most common e ranges on a range from 1 00 to. For example some lowvalue 1% resistors are available in e12 only. 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. They are the standard e3, e6, e12, e24, e48 and e96 resistor values. Crsa series high power antisurge resistor rohs directive 2015863, mar 31, 2015 and annex.
It is a good practise to specify resistors from a low series when tolerance requirements are not high. E96 marking for crs0603a, 1 % code r value code r value code r value code r value code r value code r value code r value code. These are referred to as preferred values or eseries, and they are published in standard iec 60063. 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.
General resistor information resistive product solutions for shared e24 e96 values, 1% tolerance products may be marked with 3digit marking instead of the standard 4digit marking for all other e96 values. Below are the rules to follow for reading the value of eia96 smd resistors. If you are not able to find the exact value of resistor that you have calculated, then select the next coming value of resistor that you have calculated, for example, if the calculated value is 3. Type or electronically paste the text below into any cell other than a1. Eseries values standard series values in a decade for. In the table below the values for each code is given, which are basically the values from the e96 series. Standard eia decade resistor values table e6 e12 e24. Selecting resistor values traditionally has been a manual process where the calculated value is matched to a real value in a printed lookup table.
Generally, 5% tolerance resistors are available in e24 and 1% resistors in e96, but this is not a hard and fast rule. The e series consists of the e3, e6, e12, e24, e48, e96 and e192 series. 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. These standard resistor values have a logarithmically based sequence and this enables the different values to be spaced in such a way that they relate to the component tolerance or accuracy. The values of the e24 e96 series are, cl e96 series. You want to find the e24e48 e96 resistor value that is closest to a given exact value programmatically using python. E192 datasheet, cross reference, circuit and application notes in pdf format. Standard eia decade resistor values table pc control. Resistors from the e96 series are either marked with a. Its nice to know the range of possible resistor values when you are designing circuits. Find similar products choose and modify the attributes above to find similar products. All standard resistor values can be found in the table below.
Excel formula calculates standard 1%resistor values. The first band cant be silver or gold, so if you hold such a resistor youll know instantly where to start. Surface mount resistor marking vishay intertechnology. The values are from e96 series 96 values per decade. The 120 ohm resistor has a value ranging between 110 and ohms. Standard eia decade values table e6 e12 e24 e48 e96 e192. Instead resistors are made in a restricted range of values and each value is quoted as a specific number of ohms plus or minus a percentage of the quoted value, this range of possible values is called the tolerance of the resistor. Resistors are manufactured in series of standard resistance values.
1074 550 1311 194 1308 1432 116 1022 775 1619 224 921 1558 1468 302 257 545 1027 641 614 234 1142 63 795 199 23 217 732 836 146 1093 639 1121 869 625 24 18 301 262 1294 631