Resistor Colour Code: Calculation, Colour code, Chart Explained

resistor colour code

resistor colour code

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Resistor values are sometimes indicated with color codes. Virtually all leaded resistors with an influence score as much as one watt are marked with color bands. The coding is outlined within the worldwide commonplace IEC 60062.

This commonplace describes the resistor color code rhyme” marking codes for resistors and capacitors. It contains additionally numerical codes, as for instance usually used for SMD resistors. The color code is given by a number of bands.

resistor color code Collectively they specify the resistance worth, the tolerance, and typically the reliability or failure charge. The variety of bands varies from three to 6. At least, two bands point out the resistance worth and one band serves as a multiplier. The resistance values are standardized; these values are known as most popular worth.

resistor colour code chart

The chart under reveals the way to decide the resistance and tolerance for resistors. The desk may also be used to specify the colour of the bands when the values are recognized.

Color Signficant figuresMultiply Tolerance
 Temp. Coeff.
 Fail Rate
black 000x 1  250 (U) 
brown 111x 10 1 (F) 100 (S) 1
red 222x 100 2 (G) 50 (R) 0.1
orange 333x 1K  15 (P) 0.01
yellow 444x 10K  25 (Q) 0.001
green 555x 100K 0.5 (D) 20 (Z) 
blue 666x 1M 0.25 (C) 10 (Z) 
gray 777x 10M 0.1 (B) 5 (M) 
white 888x 100M 0.05 (A) 1(K) 
gold 999x 1G   
silver 3th digit
only for 5
and 6 bands
x 0.1 5 (J)  
none x 0.01 10 (K)  
  20 (M)  


TIPS FOR READING resistor colour code

  • Within the sections under examples are given for various numbers of bands, however, first some ideas are given to learn the color code The studying route may not at all times be clear. Typically the elevated house between band 3 and 4 give away the studying route. Additionally, the primary band is often the closest to a lead.
  • A gold or silver band (the tolerance) is at all times the final band. It’s a good observation to test the producer’s documentation resistor color code to make certain in regards to the used coding system. Even higher is to measure the resistance with a multi-meter. In some circumstances this may even be the one manner to determine the resistance; for instance when the color bands are burnt off.



The 4 band color code is the most typical variation. These resistors have two bands for the resistance worth, one multiplier, and one tolerance band. Within the instance resistor colour code on the left, these bands are inexperienced, blue, purple, and gold. resistor color code Through the use of the colour code chart, one finds that inexperienced stands for five and blue for six. The worth is thus 56·100 =5600 Ω.

The golden band implies that the resistor has a tolerance of 5%. The resistance worth lies subsequently resistor colour code between 5320 and 5880 Ω. resistor color code If the tolerance band could be left clean, the result’s a 3 band resistor. Which means that the resistance worth stays the identical, however the tolerance is 20%.



Resistors with excessive precision have an additional band to point a 3rd important digit.

  • resistor color code Due to this fact, the primary three bands point out the numerous digits, the fourth band is the multiplying issue and the fifth band represents the tolerance.
  • There are exceptions to this. For instance, typically the additional band signifies failure charge (navy specification) or resistor color code temperature coefficient (older or specialized resistors).
  • Please learn the part “Color code exceptions” for extra info. Proven instance: brown (1), yellow (4), purple (7), black (x1), inexperienced (0.5%): 147 Ω 0.5%.


  • Resistors with 6 bands are often for prime precision resistors which have a further band to specify the temperature coefficient (ppm/Okay). The most typical resistor colour code coloration for the sixth band is brown (100 ppm/Okay). Which means that for a temperature change of 10 ˚C, the resistance worth can change 0.1%.
  • For particular purposes the place temperature coefficient is vital different colours Proven instance: orange (3), purple (2), brown (1), inexperienced (x10), brown (1%), purple (50 ppm/Okay): 3.21 ok Ω 1% 50 ppm/Okay.



  • Reliability band

Resistors which might be produced in accordance with navy specs, typically embody an additional band to point reliability. That is laid out in failure charge (%) per 1000 hours of service. That is hardly ever utilized resistor colour code in industrial electronics. Principally the reliability band might be discovered on 4 band resistors. Extra details about the reliability might be discovered within the US navy handbook MIL-HDBK-199.

  • Single black band or zero-ohm resistor

A resistor with a single black band known as a zero-ohm resistor. Principally it’s a wire hyperlink with solely operate of connecting traces on a PCB. resistor colour code Utilizing the resistor bundle has the benefit of with the ability to use the identical automated machines to position parts on a circuit board.

  • 5 band resistor with a 4th band of gold or silver

5 band resistors with a fourth band of gold or silver type an exception, and are used on specialised and older resistors. resistor colour code The primary two bands signify the numerous digits, the 3th the multiply issue, the 4th the tolerance and the fifth the temperature coefficient (ppm/Okay).

  • Deviating colors

5 band resistors with a fourth band of gold or silver type an exception, and are used on specialised and older resistors. resistor colour code The primary two bands signify the numerous digits, the 3th the multiply issue, the 4th the tolerance and the fifth the temperature coefficient (ppm/Okay).


In 1952 the IEC (Worldwide Electrotechnical Fee) determined to outline the resistance and tolerance values right into a norm, to ease the mass manufacturing of resistors. These are known as most popular values or E-series, and they’re printed in commonplace IEC 60063:1963. These commonplace values resistor colour code are additionally legitimate for different parts like capacitors, inductors and Zener diodes. Thepreferred values for resistors have been established in 1952, however the idea of the geometric collection was already launched by military engineer Renard within the 1870s.


The standardization of resistor values serves a number of necessary functions. When producers produce resistors with totally different resistance values, these find yourself roughly equally spaced on a logarithmic scale. resistor colour code This helps the provider to restrict the variety of totally different values that must be produced or stored in inventory.

Through the use of commonplace values, resistors of various producers are suitable for a similar design, which is favorable for {the electrical} engineer. Other than the popular values, many different requirements associated to resistors exist. An instance is commonplace sizes for resistors, or the marking of resistors with coloration codes or numerical codes. resistor colour code Energy rankings of resistors usually are not outlined in a norm, subsequently usually is deviated from the above described collection.


As foundation the E12 has been developed. E12 implies that each decade (0.1-1, 1-10, 10-100 and many others.) is split in 12 steps. The scale of each step is the same as

resistor colour code

One may additionally say each worth is 120% larger than the final, rounded to complete numbers. Due to this, all resistors with a tolerance of 10% overlap. resistor colour code The collection appears to be like 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 and many others. All these values might be powers of ten (1.2– 12 – 120 and many others.).

resistor colour code

Subsequent to the E12 collection, different collection are present. resistor colour code It’s a good observe to specify resistors from a low collection when tolerance necessities usually are not excessive. The most typical collection are

  • E6 20%
  • E12 10%
  • E24 5% (additionally out there with 1%)
  • E48 2%
  • E96 1%
  • E192 0.5% (additionally used for resistors with 0.25% and 0.1%)


SMD stands for Floor Mounted System. An SMD is any digital element that’s made to make use of with SMT, or Floor Mount Expertise. resistor colour code SMT was developed to satisfy the continuing want for printed circuit board manufacture to make use of smaller parts and be quicker, extra environment friendly, and cheaper. SMDs are smaller than their conventional counterparts. They’re usually sq., rectangular or oval in form, with very low profiles.

SMD resistors on a
circuit board from a
USB reminiscence stick
  • As an alternative to wire leads that undergo the PCB, SMD’s have small leads or pins which might be soldered to pads on the floor of the board. resistor color code This eliminates the necessity for holes within the board and lets each side of the board be extra totally used.
  • The manufacture of PCBs utilizing SMT is much like that for parts with leads. Small pads of silver or gold plate or tin-lead are positioned on the board for attaching the parts. Solder paste, a combination of flux and small balls of solder, is then utilized to the mounting pads by a machine much like a pc printer.
  • As soon as the PCB is ready, SMDs are positioned on it utilizing a machine known as a pick-and-place machine. The parts are fed to the machine in lengthy tubes, on rolls of tape, or in trays. resistor color code These machines can connect hundreds of parts per hour; one producer advertises a charge as excessive as 60,000cph. The board is then despatched by way of a reflow soldering oven.
  • On this oven, the board is slowly introduced as much as a temperature that can soften the solder. As soon as cooled, the board is cleaned to take away solder flux residue and stray solder particles. A visible inspection checks for lacking or out-of-position components and that the board is clear.


  • The time period bundle refers back to the dimension, form, and/or lead configuration of a digital element. resistor color code As an example, an IC chip that’s has led in two rows down reverse sides of the chip known as a Twin Inline Bundle (DIP) chip. In SMD resistors, resistor bundle designators inform the size and width of the resistor. SMD packages could also be given in inches in addition to in millimeters.
  • It’s subsequently necessary to test the producer’s documentation. Within the desk under the most typical packages are given in imperial items with the metric equal. Moreover, an approximation is given for the everyday energy rankings.


Due to the small dimension of SMD resistors, there may be usually not room for the normal coloration band code to be printed on them. resistor colour code Due to this fact, new resistor SMD codes have been developed. Probably the most generally seen codes are the three and 4 digit system and an Digital Industries Alliance (EIA) system known as EIA-96.


On this system the primary two or three digits point out the numerical resistance worth of the resistor and the final digit offers a multiplier. resistor colour code The variety of the final digit signifies the ability of ten by which to multiply the given resistor worth. Listed below are some examples of values beneath this method

  • 450 = 45Ω x 100 is 45Ω
  • 273 = 27Ω x 103 is 27,000Ω (27kΩ)
  • 7992 = 799Ω x 102 is 79,900Ω (79.9kΩ)
  • 1733 = 173Ω x 103 is 173,000Ω (173kΩ)

The letter “R” is used to point the place of a decimal level for resistance values decrease than 10 ohms. Thus, 0R5 could be 0.5Ω and 0R01 could be 0.01Ω.


Increased precision resistors, mixed with the reducing sizes of resistors, have created the necessity to have a brand new, extra compact marking for SMD resistors. resistor colour code Due to this fact the EIA-96 marking system has been created. It’s based mostly on the E96-series, thus geared toward resistors with 1% tolerance. On this system, the marking exists out of three digits.

2 numbers to point the resistor worth and 1 letter for the multiplier. The 2 first numbers signify a code that signifies a resistance worth with three important digits. Within the desk under the values for every code is given, that are mainly the values from the E96 collection. For instance, the code 04 means 107 ohms, and 60 means 412 ohms. The multiplying issue offers the ultimate worth of the resistor, for instance

  • 01A = 100 Ω ±1%
  • 38C = 24300 Ω ±1%

The utilization of a letter prevents the confusion with different marking programs. Nevertheless, listen as a result of the letter R is utilized in each programs. resistor colour code For resistors with tolerances aside from 1%, totally different letter tables exist.

As with bundle codes, resistor colour code these resistance worth codes are widespread, however a producer might use a variation on these and even one thing utterly totally different. It’s subsequently at all times necessary to confirm the producer’s marking system.

CodeMultiply factor


Resistors can be found in a considerable amount of totally different packages. These days probably the most used are the oblong floor mount resistors, but in addition the great previous axial resistor remains to be used extensively resistor colour code in through-hole designs. This web page will inform you in regards to the dimensions of SMD, axial and MELF packages and in regards to the required land patterns for SMD parts.


  • The form and dimension of floor mount resistors are standardized; most producers use the JEDEC requirements. The scale of SMD resistors is indicated by a numerical code, reminiscent of 0603.
  • This code comprises the width and top of the bundle. resistor color code So within the instance of 0603 Imperial code, this means a size of 0.060″ and a width of 0.030″. This code might be given in Imperial or Metric items, basically, the Imperial code is used extra usually to point to the bundle dimension.
  • Quite the opposite in fashionable PCB design metric items (mm) are extra usually used, this may be complicated. Usually, you may assume the code is in imperial items, however, the dimensions used are in mm. The SMD resistor dimension relies primarily on the required energy score. The next desk lists the scale and specs of generally used floor mount packages.



When designing with floor mount parts the appropriate solder pad dimension and land sample needs to be used. The next desk reveals a sign of the land sample for widespread floor mount packages. (resistor colour code)The desk lists the scale for reflow soldering, for wave soldering smaller pads are used.

resistor colour code


“resistor colour code calculator online”


The scale of axial resistors shouldn’t be as standardized because the SMD resistors and totally different producers usually use barely totally different dimensions. Moreover the scale of an axial resistor relies on the ability score and the kind of resistor reminiscent of carbon composition, wirewound, carbon or steel film. The next drawing and desk give a sign of the scale of widespread carbon film and steel film axial resistors. Every time the precise dimension must be recognized, at all times test the producer datasheet of the element.


  • Typically floor mount resistors are additionally used as MELF packages (Steel Electrode Leadless Face). The primary benefit of utilizing MELF as an alternative of normal SMD packages is the decrease thermal coefficient and higher stability.
  • The TCR of skinny film MELF resistors is commonly between 25-50 ppm/Okay whereas commonplace thick film SMD resistors usually have a TCR of > 200 ppm/Okay. That is potential because of the cylindrical development of MELF resistors.
  • This cylindrical development additionally offers the bundle distinct disadvantages, primarily when the parts must be positioned utilizing choose and place machines. Due to their spherical form a particular suction cup and extra vacuum is required. There are three widespread MELF bundle sizes: MicroMELF, MiniMELF and MELF. The next desk lists the traits of those varieties.


“resistor color code saying”

A number of requirements exist, which describe how the totally different parts needs to be displayed. Previously lots of international locations and even industries used their very own requirements, which might be complicated. These days the IEC 60617 commonplace is worldwide commonplace for these digital symbols.

Nevertheless the native requirements are nonetheless used once in a while. Usually, the ANSI commonplace remains to be widespread in the US. Some examples of requirements which describe resistor symbols.

  • IEC 60617 (Worldwide)
  • ANSI Y32 / IEEE 315 (US) – previous
  • DIN 40900 (Germany) – previous
  • AS 1102 (Australia) – previous

Typically the image for a selected system is totally different when it’s utilized in one other discipline of software. Different symbols are utilized in electronics then for instance in structure and buildings. On high of this, many native deviations from the worldwide requirements exist. The next desk reveals the most typical resistor symbols for electronics design.

“inductor colour code”

“resistor parameters”

SortAbbr.IEC (International)ANSI (US)
Fixed resistorRFixed resistorFixed resistor R
Heating resistorHeating resistor
Trimming potentiometerTrimming potentiometerTrimming potentiometer
Preset resistorPreset resistorPreset resistor
Photo resistor
Light dependent resistor
LDRPhoto resistor or Light dependent resistorPhoto resistor or Light dependent resistor
Voltage dependent resistor
Varistor or Voltage dependent resistorVaristor or Voltage dependent resistor
NTC thermistorNTC
NTC thermistorNTC thermistor
PTC thermistorPTC
PTC thermistor PTCPTC thermistor PTC
Magneto resistor
Magnetic dependent resistor
MDRMagneto resistor or Magnetic dependent resistorMagneto resistor or Magnetic dependent resistor


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