Resistor color code calculator

 

This resistor color code calculator will help you determine the value of axial resistors marked with color bands. It can be used for 3, 4, 5 and 6 band resistors. You can select the colors of the corresponding bands by clicking on them in the table. The resistor will visually show your band color choices and display the value of the resistor above. If the resistance value is part of a standard E-series value, this will be shown in brackets after the resistance value. How to use the color code calculator Select the amount of bands of the resistor on the top-left Choose the colors of the bands by clicking on the corresponding box in the chart The corresponding ohmic value and tolerance of the resistor is shown Bands: 3 4 5 6 10k&#8486 ±5% 1st digit 2nd digit 3rd digit multiply tolerance TCR(ppm/K) Bad Black 0 0 0 1 1% (F) 100 Beer Brown 1 1 1 10 2% (G) 50 Rots Red 2 2 2 100 15 Our Orange 3 3 3 1K 25 Young Yellow 4 4 4 10K Guts Green 5 5 5 100K 0.5% (D) But Blue 6 6 6 1M 0.25% (C) 10 Vodka Violet 7 7 7 10M 0.1% (B) 5 Goes Gray 8 8 8 100M 0.05% (A) Well White 9 9 9 1G Get Gold 0.1 5% (J) Some Silver 0.01 10% (K) Now None 20% (M) Special cases 6 band resistors In the case of 6 band resistors, this calculator assumes the 6th band is used to indicate the thermal coefficient. In some rare cases the 6th band can also indicate the reliability of the resistor. For more information visit the main page on the resistor color code. Disclaimer While we did our best to check all possibilities and remove [… read more]

Resistor symbols

 
Resistor symbols

All types of resistors have their own resistor symbols which are used when a circuit diagram is drawn. This page will explain the different standards which are used for resistor symbols and display the most common symbols. Standards for resistor symbols Several standards exist, which describe how the different components should be displayed. In the past a lot of countries or even industries used their own standards, which can be confusing. Nowadays the IEC 60617 standard is international standard for these electronic symbols. However the local standards are still used from time to time. In general, the ANSI standard is still common in the United States. Some examples of standards which describe resistor symbols: IEC 60617 (International) ANSI Y32 / IEEE 315 (US) – old DIN 40900 (Germany) – old AS 1102 (Australia) – old Sometimes the symbol for a particular device is different when it is used in another field of application. Other symbols are used in electronics then for example in architecture and buildings. On top of this, many local deviations from the international standards exist. The following table shows the most common resistor symbols for electronics design. Schematic symbols  Type Abbreviation IEC (International) ANSI (US) Fixed resistor R Heating resistor Variable resistors VR Potentiometer Trimming potentiometer Rheostat Preset resistor Dependent resistors Photo resistor orLight dependent resistor LDR     Varistor or Voltage dependent resistor  VDRRVMOV  NTC thermistor NTCRT PTC thermistor PTCRT Magneto resistor orMagnetic dependent resistor   MDR

Resistor values

 
Resistor values

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. These are referred to as preferred values or E-series, and they are published in standard IEC 60063:1963. These standard values are also valid for other components like capacitors, inductors and Zener diodes. The preferred values for resistors were established in 1952, but the concept of the geometric series was already introduced by army engineer Renard in the 1870s. 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. By using standard values, resistors of different manufacturers are compatible for the same design, which is favorable for the electrical engineer. Aside from the preferred values, many other standards related to resistors exist. An example is standard sizes for resistors, or the marking of resistors with color codes or numerical codes. Power ratings of resistors are not defined in a norm, therefore often is deviated from the above described series. Preferred values or E-series As basis the E12 has been developed. E12 means that every decade (0.1-1, 1-10, 10-100 etc) is divided in 12 steps. The size of every step is equal to:   One could also say every value is 21% or 1.21 times higher than the last, rounded to whole numbers. Because of this, all resistors with a tolerance of 10% overlap. The series looks as follows: 1– 1.2 – 1.5 – 1.8 – 2.2 – 2.7 – 3.3 – 3.9 – 4.7 – 5.6 – 6.8 – 8.2 – 10 etc. All these values [… read more]

Resistor SMD code

 
Resistor SMD code

What are SMD Resistors? SMD stands for Surface Mounted Device. An SMD is any electronic component that is made to use with SMT, or Surface Mount Technology. SMT was developed to meet the ongoing desire for printed circuit board manufacture to use smaller components and be faster, more efficient, and cheaper. SMDs are smaller than their traditional counterparts. They are often square, rectangular or oval in shape, with very low profiles. Instead of wire leads that go through the PCB, SMD’s have small leads or pins that are soldered to pads on the surface of the board. This eliminates the need for holes in the board, and lets both sides of the board be more fully used. The manufacture of PCBs using SMT is similar to that for components with leads. Small pads of silver or gold plate or tin-lead are placed on the board for attaching the components. Solder paste, a mixture of flux and small balls of solder, is then applied to the mounting pads by a machine similar to a computer printer. Once the PCB is prepared, SMDs are placed on it using a machine called a pick-and-place machine. The components are fed to the machine in long tubes, on rolls of tape or in trays. These machines can attach thousands of components per hour; one manufacturer advertises a rate as high as 60,000cph. The board is then sent through a reflow soldering oven. In this oven, the board is slowly brought up to a temperature that will melt the solder. Once cooled, the board is cleaned to remove solder flux residue and stray solder particles. A visual inspection checks for missing or out-of-position parts and that the board is clean. SMD resistor calculator This calculator helps you to find the resistance value of surface mount resistors. [… read more]

Resistor color code

 
Resistor color code

How does the resistor color code work? Resistor values are often indicated with color codes. Practically all leaded resistors with a power rating up to one watt are marked with color bands. The coding is defined in the international standard IEC 60062. This standard describes the marking codes for resistors and capacitors. It includes also numerical codes, as for example often used for SMD resistors. The color code is given by several bands. Together they specify the resistance value, the tolerance and sometimes the reliability or failure rate. The number of bands varies from three till six. As a minimum, two bands indicate the resistance value and one band serves as multiplier. The resistance values are standardized, these values are called preferred value. Resistor color code chart The chart below shows how to determine the resistance and tolerance for resistors. The table can also be used to specify the color of the bands when the values are known. An automatic resistor calculator can be used to quickly find the resistor values. Tips for reading resistor codes In the sections below examples are given for different numbers of bands, but first some tips are given to read the color code: The reading direction might not always be clear. Sometimes the increased space between band 3 and 4 give away the reading direction. Also, the first band is usually the closest to a lead. A gold or silver band (the tolerance) is always the last band. It is a good practice to check the manufacturer’s documentation to be sure about the used coding system. Even better is to measure the resistance with a multi-meter. In some cases this might even be the only way to figure out the resistance; for example when the color bands are burnt off. 4 band resistor The [… read more]

Resistor standards and codes

 
Resistor standards and codes

Standardization is a key element in the design of electronic components. A huge amount of effort and money is saved by having standards for resistor sizes, values, markings, symbols and measurement methods. Although international standards like the IEC (International Electrical Commission) and national standards such as ANSI (American National Standards Institute) are widely accepted, resistor manufacturers often use their own definitions. Therefore it is always important to carefully check the manufacturers’ documentation. Resistor color code Practically all leaded axial resistors up to one watt are marked with the electronic color code (international standard IEC 60062). The resistor color code is a marking system with colored bands that are painted on the resistor body. Together they indicate the resistor value and tolerance. Resistors can have 3, 4, 5 and 6 bands. The resistor color code chart is a handy table to decipher the coding system. Resistor color code calculator This interactive tool let’s you adjust a resistor within seconds and returns the resistance value, tolerance and temperature coefficient. It even indicates if the resistor belongs to an E-series (preferred values). Resistor SMD code SMD (Surface Mount Device) resistors are marked with a (alpha)-numerical code to indicate the resistor value and tolerance. Often these resistors are too small for the resistor color code. Two popular marking systems exist: the 3 and 4 digit code and the EIA-96 code. Resistor values Soon after resistors became mass produced, a system with preferred values was developed to minimize the number of different sizes that had to be produced. Now preferred values for resistors and other electronic components are defined in the international standard IEC 60063. The preferred values for electronics are defined in E-series. Resistors are manufactured with a certain tolerance. The preferred value system is set up that each the tolerance of each resistor [… read more]