# ~ Electronic Component Letter and Colour Codes ~

 Typographic or letter codes for ERIE and older tubular ceramic capacitors These are marked with 1 to 3 numbers and a decimal point to indicate the value in pF with 2 letters to indicate the tolerance and temperature coefficient or 3 letters to indicate the tolerance and dielectric material used for high permittivity types (Hi-k dielectric) For values between 1000pF and 9900pF K is used as the 1000s marker i.e. 1K = 1,000pF and 3K3 = 3,300pF ~ For values 10,000pF and over the value is marked in µF where .01 = 10,000pF or 10nF nowadays Note that a value of 470 is actually 470pF whereas modern letter codes would make the value 47pF i.e. 47 multiplied by 100 pF ~ Before the 1970s things were simpler ? ~ 470JN = 470pF ±5% -750ppm/°C Emphasis was given to the temperature coefficient because ceramic capacitors were often used to compensate for the temperature effects of inductors in tuned circuits and filters ~ In the days before naked bungee jumping one of the biggest thrills you could get was making a precise odd value of capacitance with a specific temperature coefficient from a minimum of standard values The working voltage for the 11mm and 14mm long white tube versions shown below is 750Vdc ~ 500Vac or 175VA @ 0.5Arms for RF ~ This form of coding was also applied to ceramic disc capacitors until the 1960s and can be confused with markings on later disc capacitors so beware First letter Tolerance Second letter Temperature coefficient /°C or Second letter pair Dielectric type for Hi-K B ±0.1pF W P470 (+470ppm) AA K060011 C ±0.25pF A P100 (+100ppm) AC K120051 D ±0.5pF B P030 (+30ppm) AD K120061 F ±1% C NPO (±0ppm) AE K120071 G ±2% D N030 (-30ppm) AF K120081 H ±2.5% E N050 (-50ppm) AG K170041 J ±5% F N080 (-80ppm) AH K170051 K ±10% G N150 (-150ppm) AJ K170061 M ±20% H N220 (-220ppm) AK K250011 N -20% +40% J N330 (-330ppm) AL K2600 P -20% +80% K N470 (-470ppm) AM K3000 R 0 +100% L N560 (-560ppm) AN K350011 S ±25% M N650 (-650ppm) AO K350081 T -20% +100% N N750 (-750ppm) AP K4000 U -20% +50% P N1500 (-1500ppm) AR K4007 V ±50% R N2200 (-2200ppm) AS K400011 S N3300 (-3300ppm) AV K7000 6.8pF ±0.25pF -30ppm T N4200 (-4200ppm) AW K7001 U N4700 (-4700ppm) AX K7004 V N5600 (-5600ppm) AY K750012 AZ K800011 6.8pF 10%+100ppm BA K4500 BB K6994 BC K6998 BD K7002

 4 or 5 coloured dots or bands for tubular Ceramic Capacitor colour code For only 4 colours ignore the 1st or end colour ~ If you have a colour that does not fit like Blue for dot 4 or 5 then you are reading the wrong way or this is the wrong table for the component 1st or end colour Temperature coefficient (ppm/°C) 2nd & 3rd colours C Value Significant figures 4th colour C Value Multiplier 5th colour Tolerance C > 10pF 5th colour ToleranceC < 10pF NPO (0) 0 x1pF ±20% ±2pF N030 (-30) 1 x10pF ±1% N080 (-80) 2 x100pF ±2% N150 (-150) 3 x1nF ±2.5% ±0.25pF N220 (-220) 4 x10nF N330 (-330) 5 6.8pF ±1pF 0ppm ±5% ±0.5pF N470 (-470) 6 6.8pF ±0.5pF -30ppm N750 (-750) 7 P030 (+30) 8 x0.01pF P100 (+100) 9 x0.1pF ±10% ±1pF

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 6 Colour dots or bands tubular Ceramic Capacitor colour code If you have a colour that does not fit like Yellow for dot 6 or Blue for dot 2 then you are reading the wrong way or this is the wrong table for the component you have 1st or end colour Temperature coefficient ppm/°C 2nd colour temperature coefficient Multiplier 3rd & 4th colours C Value Significant figures 5th colourC Value Multiplier 6th colour ToleranceC > 10pF 6th colour ToleranceC < 10pF 0 x1 0 x1pF ±20% ±2pF -3 x10 1 x10pF ±1% -8 x100 2 x100pF ±2% -1.5 x1000 3 x1nF ±2.5% ±0.25pF -2.2 x10,000 4 x10nF -3.3 5 100pF ±10% -3300ppm ±5% ±0.5pF -4.7 6 270pF ±10% -470ppm -7.5 7 +3 x0.01 8 x0.01pF +1 x0.1 9 x0.1pF ±10% ±1pF

 6 Coloured dot moulded Mica Capacitor colour code Look for an Arrow in the moulding and with the arrow facing left to right start reading from top left clockwise finishing at Red Green or White at bottom left ~ Top left colour indicates the construction type which is sometimes left blank when a colour fleck is introduced to the moulding ~ Any colours not in the table positions below indicates you are reading the wrong way or wrong component for this table Top Left colour Construction type Next 2 colours Significant figures next colour Multiplier 5th colour Tolerance 6th colour Working voltage 0 x1pF ±20% 1 x10pF ±1% Metalised 2 x100pF ±2% 350Vdc 3 x1nF 4 47pF ±2% 750Vdc Metalised Mica Foil 5 750Vdc 6 7 8 x0.01pF 9 x0.1pF 2000Vdc GOLD 0.1pF ±5% SILVER 0.01pF ±10% NONE ±20%

 Metalised Polyester ~ Philips Mullard C280 ~ Capacitor colour code Read colours from top to bottom ~ If there are less than 5 colour bands then consider two adjacent colours are the same e.g. 22nF or 330nF or 1µF 5% with 4 bands and 3.3µF 5% or 2.2µF 5% only 3 bands Top & 2nd colour Significant figures 3rd colour Multiplier 4th colour Tolerance 5th colour Working Voltage 0 0 ±20% 1 1 100nF (10x0.01µF) ±20% 400Vd.c. 100Vdc 2 2 250Vdc 3 3 x0.001µF 4 4 x0.01µF 400Vdc 5 5 x0.1µF ±5% 6 6 220nF (22x0.01µF) ±10% 400V d.c. 630Vdc 7 7 8 8 9 9 ±10% 1000Vdc

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 Vintage Solid Carbon Rod Resistor colour code Body colour 1st Significant Figure End colour 2nd Significant Figure Centre Dot colour Multiplier End (Dot) colour Tolerance 0 0 x1Ω 1 1 x10Ω 2 2 x100Ω 33kΩ ±10% 3 3 x1kΩ 4 4 x10kΩ 5 5 x100kΩ 6 6 x1MΩ 7 7 47kΩ ±20% 8 8 9 9 NONE ±20% SILVER x0.01Ω SILVER ±10% GOLD x0.1Ω GOLD ±5%

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 3 & 4 Band Carbon Composition Resistor colour code 1st colour band1st Significant Figure 2nd colour band 2nd Significant Figure 3rd colour band Multiplier 4th colour band Tolerance 0 0 x1Ω 1 1 x10Ω ±1% 2 2 x100Ω ±2% 3 3 x1kΩ 4 4 x10kΩ ±5% see note below 5 5 x100kΩ 4.7MΩ 5% 6 6 x1MΩ 7 7 47kΩ ±10% 8 8 9 9 330Ω ±2% GOLD x0.1Ω GOLD ±5% SILVER x0.01Ω SILVER ±10% NONE ±20% Sometimes a 5th Salmon Pink colour band is added to indicate a high stability carbon composition is used as shown above ~ 330Ω ±2%. This should not to be confused with modern 5 band resistors as outlined in the next table below ~ Philips VR series of high ohmic resistors and some others use Yellow in place of gold for tolerance ~ 4.7MΩ 5% above

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 5 & 6 Band Resistor colour code Unlike older resistors the widest band is often the last of 6 ~ If only 5 bands ignore last column in table 1st 3 colour bands Significant Figures 4th colour band R Multiplier 5th colour band Tolerance 6th Colour band ppm / °C 0 x1Ω 1 x10Ω ±1% +100 2 x100Ω ±2% +50 3 x1kΩ 68kΩ 1% 50 ppm/°C +15 4 x10kΩ 55 5 x100kΩ 6 x1MΩ ±0.25% +10 7 47kΩ 1% 50 ppm/°C ±0.1% +5 8 9 +1 GOLD x0.1Ω GOLD ±5% SILVER x0.01Ω SILVER ±10%

 Cartridge Fuse paint dot or float transfer colour code 150mA 500mA SALMON-PINK 50mA VIOLET 2A BLACK 60mA WHITE 3A GREY 100mA BLACK WHITE 5A RED 150mA ORANGE 7A BROWN 250mA ORANGE BLACK 10A YELLOW 500mA ORANGE GREY 12A GREEN 750mA ORANGE GREEN 15A BLUE 1A ORANGE VIOLET 20A SKY-BLUE 1.5A ORANGE WHITE 25A

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