Resistor calculator series and parallel if you need a nonstandard resistor value you could probably realize a close match using two resistor. The table below shows the standard values for the decade between 100 and 1,000. 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. 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. If you use two resistor in series it is quite easy to figure out which values give the best match. The 120 ohm resistor has a value ranging between 110 and ohms. The following table lists four established number series which are used as preferred values in electronic design. 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. The rationale is simple select values for components based on the tolerances with which they are able to be manufactured. This refers to eia standard resistor values listed here. Standard eia decade resistor values table e6 e12 e24. The standard e3, e6, e12, e24, e48 and e96 resistor values are listed below.
There are four more or less commonly used resistor series, with 12, 24, 48, and 96 values per decade, respectively. Resistor kits are available at mouser electronics from industry leading manufacturers. Generally, 5% tolerance resistors are available in e24 and 1% resistors in e96, but this is not a hard and fast rule. You want to find the e24e48 e96 resistor value that is closest to a given exact value programmatically using python. Values in this group are rounded to 2 trailing digits.
E6 series tolerance 20% e12 series tolerance 10% e24 series tolerance 5% and 1% e48 series tolerance 2% e96 series tolerance 1% e192 series tolerance 0. The electronic industries association eia, and other authorities, specify standard values for resistors, sometimes referred to as the preferred value system. In most cases this will specify the standard value series, often e24 or e96. Low ohmic value products are often additionally available in integer values up to 10 milliohms and in multiples of 5 milliohms. 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. Please refer to standard resistance values shown on this catalog. To find standard values in other decades, multiply or divide the table value by powers of 10. Aug 18, 2019 the e series preferred or standard resistor value ranges are internationally accepted and have been adopted by international standards organisations. Standard resistance values are obtained from the decade table by multiplying by powers of 10. But i remember the most common values simply through constant exposure.
These are referred to as preferred values or eseries, and they are published in standard iec 60063. Resistors are manufactured in series of standard resistance values. If there is no tolerance band, then find the side that has. Standard series values in a decade for resistances and. The preferred value system has its origins in the early years of the last century at a time when most resistors were carbongraphite with relatively poor. The e96 and e rsihe of standard resistor values also exist, but their use is much smaller than reihhe in the other ranges given above. All e24 values available in 1% tolerance are also marked with 3. 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.
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. Standard test methods for water vapor transmission of. Standard resistor values are calculated using the simple formula given below. Use of standard values is encouraged because stocking progr ams are designed around them. The fact that a value is preferred is no guarantee that it is actually manufactured in some particular or any configuration. They are the standard e3, e6, e12, e24, e48 and e96 resistor values. For other values, multiply these by 110, 10, 100, 1,000, etc. The e series is a system of preferred numbers also called preferred values derived for use in electronic components. Standard eia decade values table e6 e12 e24 e48 e96 e192. The different values are spaced such that the top of the tolerance band of one value and the bottom of the tolerance band of the next one do not overlap. The e192 series of standard resistor values also exist, but their use is much smaller than those in the other ranges given above. A value of 105 ohm resistor falls within the 10% tolerance range of the 100 ohm resistor, so the next value outside the range. Eia standard resistor values by tolerance% move the decimal point to achieve the actual value desired.
Type or electronically paste the text below into any cell other than a1. Resistor e series tables of values below are the common resistor values. The e24 series is for resistors with a 5% tolerance precision. 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. It consists of the e3, e6, e12, e24, e48, e96 and e192 series, where the. The excel cell formula below calculates the nearest standard 1% resistor value without using a lookup table or macro.
Venkel ltd subject \pdf\ eia values for surface mount resistors are displayed in an easy to read table provided by venkel. They are particularly useful for resistor values that are not in any way critical. When resistor is to be exposed to a transient load excessive large load,such as pulse, mount the resistor on your product. Although there are online tools available for this task, it is often useful to be able to integrate scriptable functions into custom software. Metric inchpound conversion factors for wvt, permeance, and permeability are stated in table 1. Subject \ pdf \ eia values for surface mount resistors are displayed in an easy to read. Preferred number series for resistors and capacitors specifies the preferred values in the e24 series, which is the most often used.
Some products are available only at a limited set of values listed on the datasheet. These older values were used to create the e6, e12, e24 series standard that was. Standard resistance value is obtained from the above chart by multiplying by powers of 10. Excel formula calculates standard 1%resistor values. Quantization errors in resistor values are inherent to javascript. Archived pdf from the rwihe on for analogue designs it is a little more flexibility is often needed, teihe even e6 or e12 standard resistor values can be used without difficulty in the design. This specification may be changed at any time without prior notice. Resistor value and ratio calculator nightshade electronics. Selecting resistor values traditionally has been a manual process where the calculated value is matched to a real value in a printed lookup table. Standard electronic decade table vishay dale digikey.
For example some lowvalue 1% resistors are available in e12 only. Where resistance values less than ten ohms are used, the letter r is used to indicate the position of the decimal point. To determine values other than the base, multiply the base value by 1, 10, 100, 1k, or 10k. Values in this group are rounded to 1 trailing digit. Instead of using advanced javascript functions that would make the script incompatible with older browsers, i elected to. Jul 03, 2019 often designs try to keep to the e3 or e6 standard resistor values, only using those in the e12, e24, e48 or e96 if absolutely necessary. Instead of using advanced javascript functions that would make the script incompatible with older browsers, i elected to leave the quantization errors. Also see resistor color code calculator, color code chart and components part number search. Standard resistor values 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. The four digit or four figure smt resistor marking.
The others values can be obtained by multiply these values for powers of 10. Finding the nearest e96 resistor value in python techoverflow. Eia standard resistor values stackpole electronics, inc. Optimum resistor ratio approximation using standard. 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.
The e3 series resistors are the most widely used and hence these values will be the most common resistor values used within the electronics industry. These standard resistor values are those which can be bought. All standard resistor values can be found in the table below. Youll find the values for the e6, e12, e24, e48, e96 and e192 series or preferred resistor values in this table. The resistance of resistors often follows the e series. E6 e12 e24 e48 e96 e this process is followed through for all the values in a decade, creating a set of standard resistor values for each tolerance. A higher number correlates to a lower tolerance and a higher precision. The excel cell formula below calculates the nearest standard 1%resistor value without using a lookup table or macro. 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. Standard eia decade values for e6, e12, e24, e96, e192. Standard electronic decade table vishay dale digikey standard electronic decade values table. As an example, a resistor with the value 4r7 would be 4. All conversions of mm hg to pa are made at a temperature of 0c.
The e series consists of the e3, e6, e12, e24, e48, e96 and e192 series. Also see resistor color code calculator, color code chart. 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. So far, we have calculated resistor values and then picked the nearest preferred value. Standard electronic decade value tables decade table digikey. Vishay e96 series resistor kits are available at mouser electronics.
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