Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


l atch

#14081

resistor and capacitor naming codes for smt. | 27 September, 1998

I'm looking for a chart that will help me identify smt resistors and capacitors. I have figured out a few on my own. a resistor with the numbers 510 printed on it was a 51 ohm resistor. numbers 221 was a 220 ohm resistor. numbers 102 was a 1k resistor. numbers 1002 was a 10k resistor. numbers and letters of 1A4 was a .01 microfarad capacitor. (I think, I can't be for sure.) Any help will be much appreciated.

reply »

Ben Wilmot

#14082

Re: resistor and capacitor naming codes for smt. | 28 September, 1998

The majority of SMT resistors use the following notation. 10 X eg 153 represents 1k5 resistor The third digit in the sequence denotes the number of zeros to add after the first two digits giving the value in ohms. Many Caps will follow the same notation using the last number in the sequence to denote the number of zeros to add and hence you can work out the correct number of Farads. Most reels will have an alpha-numeric manufacturers code on the label denoting ,value tolerence, package type and sometimes temperture co-efficient. The best way to get informatin on these marking is dirrectly form the manufacturer (most are now availble on the net or on CD Rom).

reply »

StikNPeel™ Rework Stencils

SMT Services - STI Electronics