IEC Edition INTERNATIONAL. STANDARD. NORME. INTERNATIONALE. Marking codes for resistors and capacitors. Codes de marquage. Fifth edition. Marking codes for resistors and capacitors. Reference number. IEC (E). This is a free 5 page sample. Access the full. IEC MARKING CODES FOR RESISTORS AND CAPACITORS.
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The significantly updated IEC Retrieved from ” https: This page was last edited on 21 Augustat For example, 8K2 indicates a resistor value of 8. iwc
CS1 German-language sources de Interlanguage link template link number CS1 Russian-language sources ru Articles to be expanded from December All articles to be expanded Articles with empty sections from December All articles with empty sections Articles using small message boxes. From Wikipedia, the free encyclopedia. Today, a lowercase 60062 m should be used for capacitances whenever possible to avoid confusion. It may therefore cause confusion in some contexts.
It stems from the fact, that R is used in symbolic names for resistors as well, and it is also used in a similar fashion but with incompatible meaning in other part marking codes. For example, 1R2 indicates 1. Similar, the standard prescribes the following lowercase letters for capacitances to be used instead of the decimal point: Archived PDF from the original on The letters G and T weren’t part of the first issue of the standard, which pre-dates the introduction of the SI system hence the name “RKM code”but were added after the adoption of the corresponding SI prefixes.
The RKM code[1] also referred to as “letter and digit code for resistance and capacitance values and tolerances” or “R notation”, is a notation to specify resistor and capacitor values defined in the international standard IEC formerly IEC 62 since K k [nb 4].
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This section is empty. The code letters are loosely related to the corresponding SI prefixbut there are several exceptions, where the capitalization differs or alternative letters are used. The standards also define a color code for fixed resistors. However, the letter E is conflictive with the similar looking but incompatible E notation in engineering, and it may therefore cause considerable confusion as well.
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R E [nb 3]. Additional zeros imply tighter tolerance, for example 15M0. Originally meant also 600662 part marking codethis shorthand notation is widely used in electrical engineering to denote the values of resistors and capacitors in circuit diagrams and in the production of electronic circuits for example in bills of material and in silk screens.
The letters p and n weren’t part of the first issue of the standard, but were added after the adoption of the corresponding SI prefixes. The introduction of the letter L in more recent issues of the standard instead of an SI prefix m for milli is justified to 60602 the rule of only using uppercase letters for resistances the otherwise resulting M was already in use for mega.
The notation also avoids using a decimal separator and replaces it by a letter associated with the prefix symbol for the particular value.
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This is not only for brevity for example when printed on the part or PCBbut also to ifc the problem that decimal separators tend to “disappear” when photocopying printed circuit diagrams.
Date codes for and are obviously wrong. For brevity, the notation omits to always specify the unit ohm or farad explicitly and instead relies on implicit knowledge raised from the usage of specific letters either only for resistors or for capacitors, [nb 1] the case used uppercase letters are typically used for resistors, lowercase letters for capacitors[nb 2] a part’s appearance, and the context.
This method avoids overlooking the decimal separatorwhich may not be rendered reliably on components or when duplicating documents. When the value can be expressed without the need for a prefix, an “R” is used instead of the decimal separator.
Archived from the original on