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The '''resistor color code''' is used to indicate the value of through hole resistors below 1 Watt. [[Surface mount resistor markings]] are generally an alphanumeric code. On large [[power resistor]]s and [[potentiometer]]s the value is usually given explicitly. The codes are defined in IEC 60062.
The '''resistor color code''' is used to indicate the value of through hole resistors below 1 Watt. [[SMD resistor markings|Surface mount resistor markings]] are generally an alphanumeric code. On large [[power resistor]]s and [[potentiometer]]s the value is usually given explicitly. The codes are defined in IEC 60062.


== Preferred values ==
== Preferred values ==
Resistors are available mainly in two series of preferred values, [[E12]] (12 values per decade) and [[E24]] (24 values per decade). Carbon resistors with a tolerance 5% and less are available in the E12 series while metal film resistors with 2% and better tolerance are available in the E24 series.<!-- fix this -->
Resistors are available mainly in two series of preferred values, [[E12]] (12 values per decade) and [[E24]] (24 values per decade). Carbon resistors with a [[tolerance]] 5% and less are available in the E12 series while metal film resistors with 2% and better tolerance are available in the E24 series.<!-- fix this -->


== Help to remember ==
== Help to remember ==
Without a [https://www.google.co.uk/search?&q=resistor+colour+code+mnemonic mnemonic]: Black is darkest, brown is a dark shade of red, then the color spectrum ROY G. BIV, then grey as colour is lost, and white is brightest. Gold has a better value than silver.
Without a [https://www.google.co.uk/search?&q=resistor+colour+code+mnemonic mnemonic]: '''Black''' is darkest, '''brown''' is a dark shade of red, then the color spectrum '''ROY G. BV''', then '''grey''' as colour is lost, and '''white''' is brightest. '''Gold''' has a better value than '''silver'''.


== How to read ==
== How to read ==
The first band is closest to a lead. If there is a gap between bands 3 and 4, band 4 is the tolerance. Gold or silver gives the tolerance and the tolerance is usually the last band. Pink for the tolerance band shows it's ±20%.
The first band is closest to one end. If there is a gap between bands 3 and 4, band 4 is the tolerance. Gold or silver gives the tolerance and the tolerance is usually the last band. Pink for the tolerance band shows it's ±20%.


A resistor with a single black band is a zero-ohm resistor and can be replaced by a wire link.
A resistor with a single black band is a zero-ohm resistor and can be replaced by a wire link.


[[File:resistorcolourv4.svg|center|500px|Colour chart for 4, 5 and 6 bands resistors]]
⚫
=== Four bands ===
With four band resistors the first two bands give the first two digits of the resistance, the third band the multiplier and the fourth gives the tolerance.


== Approximate power rating of through hole resistor sizes ==
There is no standard specification for power rating of particular through hole resistor sizes. Only the seller or data sheet for a specific resistor can confirm its power rating.
[[File:resistor dimensions.svg|left|350px|Key resistor dimensions]]<br clear=all>
⚫
=== Carbon film ===
{| class="wikitable"
{| class="wikitable"
!Watts||Length (mm)!!Diameter (mm)
! colspan="2" |Band 1 & 2!!Band 3!!Band 4
|-
|-
|{{sfrac|1|8}}||3.5||1.85
!Color!!Digit!!Multiplier!!Tolerance %±
|-
|-
|{{sfrac|1|4}}||6.8||2.5
|style="background:black;color:white"|black<ref name="bk" group="note">Black isn't used for band 1.</ref>||0||1||
|-
|-
|{{sfrac|1|2}}||10.0||3.5
|style="background:brown;color:white"|brown||1||10||1
|-
|-
|1W||16.0||5.5
|style="background:red;color:white"|red||2||100||2
|-
|-
|2W||17.5||6.5
|style="background:orange;color:white"|orange||3||1k||3
|-
|style="background:yellow"|yellow||4||10k||4
|-
|style="background:green;color:white"|green||5||100k||0.5
|-
|style="background:blue;color:white"|blue||6||1M||0.25
|-
|style="background:purple;color:white"|violet||7||10M||0.1
|-
|style="background:grey;color:white"|grey||8||100M||0.05
|-
|style="background:white"|white||9||1G||
|-
|style="background:gold"|gold||||0.1||5
|-
|style="background:silver"|silver||||0.01||10
|}
|}
<ref>[https://taydaelectronics.com/datasheets/files/royalohmcarbonfilm.pdf Carbon film fixed resistors], Royal Ohm, 18 Aug 2018</ref>


=== Five bands ===
=== Metal film ===
With five band resistors, the first three bands give the first three digits of the resistance, the fourth band the multiplier, and the fifth band the tolerance. If there is a sixth band, it indicates the [[temperature coefficient]].

{| class="wikitable"
{| class="wikitable"
!Watts!!Length (mm)!!Diameter (mm)
! colspan="2" |Band 1,2 & 3!!Band 4!!Band 5!!Band 6
|-
!Color!!Digit!!Multiplier!!Tolerance %±!!Tempco (ppm/°C)
|-
|style="background:black;color:white"|black<ref name="bk" group="note"/>||0||1||||
|-
|style="background:brown;color:white"|brown||1||10||1||100
|-
|style="background:red;color:white"|red||2||100||2||50
|-
|style="background:orange;color:white"|orange||3||1k||3||15
|-
|style="background:yellow"|yellow||4||10k||4||25
|-
|style="background:green;color:white"|green||5||100k||0.5||
|-
|style="background:blue;color:white"|blue||6||1M||0.25||10
|-
|style="background:purple;color:white"|violet||7||10M||0.1||5
|-
|style="background:grey;color:white"|grey||8||100M||0.05||
|-
|style="background:white"|white||9||1G||||
|-
|style="background:gold"|gold||||0.1||5||
|-
|style="background:silver"|silver||||0.01||10||
|}

=== Three bands ===
Resistors with only three bands have a 20% tolerance.

{| class="wikitable"
! colspan="2" |Band 1 & 2!!Band 3
|-
!Color!!Digit!!Multiplier
|-
|style="background:black;color:white"|black<ref name="bk" group="note"/>||0||1
|-
|style="background:brown;color:white"|brown||1||10
|-
|style="background:red;color:white"|red||2||100
|-
|style="background:orange;color:white"|orange||3||1k
|-
|-
|{{sfrac|1|8}}||3.5||1.85
|style="background:yellow"|yellow||4||10k
|-
|-
|{{sfrac|1|4}}||6.8||2.5
|style="background:green;color:white"|green||5||100k
|-
|-
|{{sfrac|1|2}}||10.0||3.5
|style="background:blue;color:white"|blue||6||1M
|-
|-
|1||12.0||5,0
|style="background:purple;color:white"|violet||7||10M
|-
|-
|2||16.0||5.5
|style="background:grey;color:white"|grey||8||100M
|-
|-
|3||17.5||6.5
|style="background:white"|white||9||1G
|}
|}
<ref>[https://taydaelectronics.com/datasheets/files/royalohmprecisionmetalmf.pdf Precision metal film fixed resistors], Royal Ohm, 18 Aug 2018</ref>


== See also ==
== See also ==
Line 116: Line 60:
{{reflist}}
{{reflist}}
== Further reading ==
== Further reading ==
* ''A Users Guide to Selecting Electronic Components'' by Gerald L Ginsberg, John Wiley & Sons Inc, 1981, ISBN 0471083089
* ''A Users Guide to Selecting Electronic Components'' by Gerald L Ginsberg, John Wiley & Sons Inc, 1981, {{ISBN|0-471-08308-9}}
* ''Passive Components: a user's guide'' by Ian Robertson Sinclair, Butterworth-Heinemann Ltd, 1991, ISBN 0750602295
* ''Passive Components: a user's guide'' by Ian Robertson Sinclair, Butterworth-Heinemann Ltd, 1991, {{ISBN|0-7506-0229-5}}
== External links ==
== External links ==
* [https://www.mouser.co.uk/technical-resources/conversion-calculators/resistor-color-code-calculator Resistor colour code calculator], mouser
* Wikipedia:[https://en.wikipedia.org/wiki/Electronic_color_code Electronic color code]
* Wikipedia:[https://en.wikipedia.org/wiki/Electronic_color_code Electronic color code]
* Wikibooks, Electronics:[https://en.wikibooks.org/wiki/Electronics/Component_Identification Component Identification]
* Wikibooks, Electronics:[https://en.wikibooks.org/wiki/Electronics/Component_Identification Component Identification]

Latest revision as of 23:12, 26 March 2023

The resistor color code is used to indicate the value of through hole resistors below 1 Watt. Surface mount resistor markings are generally an alphanumeric code. On large power resistors and potentiometers the value is usually given explicitly. The codes are defined in IEC 60062.

Preferred values

Resistors are available mainly in two series of preferred values, E12 (12 values per decade) and E24 (24 values per decade). Carbon resistors with a tolerance 5% and less are available in the E12 series while metal film resistors with 2% and better tolerance are available in the E24 series.

Help to remember

Without a mnemonic: Black is darkest, brown is a dark shade of red, then the color spectrum ROY G. BV, then grey as colour is lost, and white is brightest. Gold has a better value than silver.

How to read

The first band is closest to one end. If there is a gap between bands 3 and 4, band 4 is the tolerance. Gold or silver gives the tolerance and the tolerance is usually the last band. Pink for the tolerance band shows it's ±20%.

A resistor with a single black band is a zero-ohm resistor and can be replaced by a wire link.

Colour chart for 4, 5 and 6 bands resistors
Colour chart for 4, 5 and 6 bands resistors

Approximate power rating of through hole resistor sizes

There is no standard specification for power rating of particular through hole resistor sizes. Only the seller or data sheet for a specific resistor can confirm its power rating.

Key resistor dimensions
Key resistor dimensions


Carbon film

Watts Length (mm) Diameter (mm)
1/8 3.5 1.85
1/4 6.8 2.5
1/2 10.0 3.5
1W 16.0 5.5
2W 17.5 6.5

[1]

Metal film

Watts Length (mm) Diameter (mm)
1/8 3.5 1.85
1/4 6.8 2.5
1/2 10.0 3.5
1 12.0 5,0
2 16.0 5.5
3 17.5 6.5

[2]

See also

Notes

References

  1. ^ Carbon film fixed resistors, Royal Ohm, 18 Aug 2018
  2. ^ Precision metal film fixed resistors, Royal Ohm, 18 Aug 2018

Further reading

  • A Users Guide to Selecting Electronic Components by Gerald L Ginsberg, John Wiley & Sons Inc, 1981, ISBN 0-471-08308-9
  • Passive Components: a user's guide by Ian Robertson Sinclair, Butterworth-Heinemann Ltd, 1991, ISBN 0-7506-0229-5

External links

Retrieved from "https://sdiy.info/wiki/Resistor_color_codes?oldid=21677"