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Capacitor Codes

Printed Values

Large capacitors will usually have their value printed on them. For instance,

you may see 47F printed on the capacitor. In this case, youhave a 47 microfarad capacitor. It could also be written as

47mF. Picofarad capacitors will often have pFwritten on

them, but in some rare cases you may find F. Also watchout for the decimal point. The capacitor may have .47F

printed on it not 47F.

The voltage rating of the capacitor will often be printed.

You could see anything from 5V to several hundred volts and

over 1000 volts for larger capacitors.

On polarized capacitors, you will also find a minus (-) sign

or some other visual indicator to show you which is the

negative terminal of the capacitor.

Numeric Codes

To save space, some capacitors use a numeric code to represent the actual

capacitor value. This capacitor code works similarly to the resistor color

code. You may have a capacitor that has 14! printed on it. "#ten it will

also have 1$ printed %elow it. The 14 represents the capacitor value, the

! represents the tolerance, and the 1$ tells us it is rated #or 1 volts.

To read the capacitor value, take the #irst two digits as the #irst and second

signi#icant digits. The third digit is a multiplier. &sually, this multiplier isthe num%er o# 'eros to add a#ter the #irst two digits. (owever ta%le 1 shows

a couple o# e)ceptions. The resulting value you get is in pico#arads which

you can then convert to micro#arads i# necessary.

&sing ta%le 1, the 14! capacitor decodes to 1,pF, or a .1F capacitor

*1,, pF + 1uF. -e#er to ta%le and you will see that the ! tells us the

tolerance is /0. This means the actual capacitor value can vary 23/0 #rom

its value o# .1F.

Table 1: Multiplier Code

Capacitor LabelsmF=1 microfaradF=1 microfaradpF=1 picofaradF=1 picofarad

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Third DigitMultiplier (multiply the first digits by this

number!

1

1 1

1

1

4 1

/ 1

5 or 7 6ot used

.1

8 .1

Table : Tolerance Code

Letter Tolerance

9 23 .10

: 23 ./0

; 23 ./0

< 23 ./0

F 23 10

= 23 0

( 23 0

! 23 /0

> 23 10

? 23 0

6 23 ./0

@ 10 ,30

A 0, 30

Color Codes

Bome capacitors use a color code system similar to the resistor color codes to

represent the capacitor value, tolerance, temperature range, etc. Bince these

capacitors are relatively rare, C wonDt cover it at this time. (owever CDll

consider adding the details here at a #uture date.

Written by Sean Moniz

June, 2001


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Copyright 2001 by Montek Electronics

capacitores codigo

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