DVD-164C Component Color Codes - IPC Training Home Page

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DVD-164C TranscriptNext, let’s see how we do with a five band resistor. The answer is six million ohms, plus orminus 0.5%. We can also abbreviate the value by converting it to 6 meg-ohms. Again, M isshort for one million. Let’s examine how we determined the answer. Our first color band is blue– which gives us a 6. The next two value bands are black – giving us two zeros for a total of 600for the three value bands of this five band resistor. The multiplier band is yellow – which meanswe add four more zeros. That makes the total value six million ohms. Finally, the tolerance bandis green – which tells us the tolerance is plus or minus 0.5%.Now, let’s try another type of five band resistor. The answer is 480 ohms, plus or minus 5%.Remember that the white band is a military identifier, and the resistor should be read as havingfour bands. Let’s see how we got this answer. The two value bands are yellow and gray – whichgives us 48. The multiplier band is brown – which means we add one zero – giving us a total of480 ohms. And the tolerance band is gold – which is plus or minus 5% tolerance. Again, thewhite band is a military identifier and is not used for determining the value or tolerance of theresistor.Let’s try a six band resistor. The answer is 263 ohms, with a 2% tolerance and a TCR of 100parts per million per degree C. Again, let’s see how we got the answer. Remember, six bands arethe same as five bands – with the addition of the TCR band. The red, blue and orange bands arevalue bands – which gives us 263. The black band is the multiplier – and since black is zero, nozeros are added. That leaves us with 263 ohms. The tolerance band is red – specifying plus orminus 2%. The sixth band is the TCR. As you can see, brown on the color chart equals 100 partsper million per degree Celsius. Therefore, the value of this six band resistor is 263 ohms, plus orminus 2% with a TCR of 100 parts per million per degree C.Capacitor and Inductor Color Band CodesWhen other types of components, such as capacitors and inductors, have color bands, they areread in the same manner as resistors – with the bands representing number values, a multiplierand tolerance. The only thing that changes is the unit of measure. Capacitors are measured inFarads and inductors are measured in Henrys. Inductors and resistors both use the same colorcodes for tolerance – but capacitors have twelve codes for tolerance.We’ll start with capacitors. As we just mentioned, the value of a capacitor is expressed in a unitof electrical capacitance called farads. The three most common units of measurement usingfarads are microfarads, nanofarads and picofarads. The picofarad has the smallest capacitancevalue. For example, one million picofarads is equal to one thousand nanofarads, or onemicrofarad.Let’s look at the color chart for a four band capacitor. As you can see, it is similar to the resistorcolor chart. The first two value bands are identical. The multiplier band is slightly different withviolet added to indicate seven zeros and grey and white replacing gold and silver to indicate eightand nine zeros, respectively. The big change is in the tolerance band – where we go from seventolerance designations for resistors to twelve for capacitors.4
DVD-164C TranscriptWhen capacitors have color bands, they will always be the four band variety. Let’s calculate thisfour band capacitor. The first two bands are blue and violet – which gives us a six and a seven, or67. Notice that the multiplier band is orange. Orange indicates three zeros. The value of thiscapacitor is sixty seven thousand picofarads. All calculations for capacitor color bands will be inpicofarads. 67,000 picofarads can be converted to 67 nanofarads, or point zero six sevenmicrofarads. The fourth tolerance band is yellow – indicating a tolerance of 4%..Let’s see if you can determine the value and tolerance of this capacitor. The answer is twohundred thousand picofarads, plus or minus 5%. Let’s look at how we made the calculation. Thefirst value band is red, or two – and the second value band is black, or zero. That gives us 20.The multiplier band is yellow – which means we add four zeros. That results in 200,000picofarads. The tolerance band is green – which gives us a 5% tolerance.Now, let’s turn our attention to inductors. Inductors are measured in henries and micro divisionsof henries. nH stands for nano-henry, micro H or uH stands for micro-henry – and mHrepresents milli-henries. Axial inductors with color bands are always decoded in micro-henries.Like capacitors, inductors typically have four color bands. Sometimes there will be a silver bandto the left of the first band. This silver band has wider spacing than the other bands and tells usthat this inductor was manufactured for the military. Let’s calculate this four band inductor. Thefirst two bands are both red – which gives us two 2s, or 22. Notice that the multiplier band isorange. Orange indicates three zeros. The value of this inductor is twenty two thousandmicrohenries. The fourth tolerance band is gold – indicating a tolerance of 5%.Occasionally, inductors will only have three color bands. When this occurs, the first two bandsare value bands – and the third band is for tolerance. Notice that there is no multiplier band.Let’s see how that works. In this example, the value bands are violet and white – giving usseventy nine microhenries. The tolerance band is brown, or plus or minus one percent tolerance.Now, let’s see if you can determine the value and tolerance of this four band inductor. Theanswer is 700 microhenries, plus or minus 2%. Let’s see how we made the calculation. The firstvalue band is violet, or seven – and the second value band is black, or zero. That gives us 70.The multiplier band is brown – which means we add one zero. That results in 700 microhenries.The tolerance band is red – which gives us a 2% tolerance.Some surface mount inductors also have color codes – indicated by three dots or stripes. With themiddle dot oriented at the top, the colors are read left to right. In this example, our surface mountinductor has three dots – green, red and yellow. The first two dots represent the value numbers.As you can see on the color chart, green is a five and red is a two. The third dot is yellow whichis the multiplier – giving us four zeros. Surface mount inductors are always calculated innanohenries – so our total value is 520,000 nanohenries. Since there is no color dot fortolerance, tolerance is assumed to be plus or minus 20% -- which is the default percentage for anyinductor or capacitor where tolerance is not specified.5
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