smd resistors

[raym]

does any one know what the last digit is on a smd resistor is? This is the layout 1913 I know that the 191 is 190k but what is the 3 on the end . does it mean the wattage, or tolerance or other
Thanks Ray

[L. Daniel Rosa]

I would guess the last digit to be the multiplier. So 1913 would be 191k. If the fourth digit means something else then the resistonce would read as 190 ohms, not a standard value for three digit resistors. If you measure it with a DMM, that will tell you. Note that this may be a 1% or better resistor and most DMMs are not rated any tighter than this, so if it reads 190k it's within spec for a four digit code.

[raym]

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by L. Daniel Rosa:
I would guess the last digit to be the multiplier. So 1913 would be 191k. If the fourth digit means something else then the resistonce would read as 190 ohms, not a standard value for three digit resistors. If you measure it with a DMM, that will tell you. Note that this may be a 1% or better resistor and most DMMs are not rated any tighter than this, so if it reads 190k it's within spec for a four digit code.<hr></blockquote>

[Dean Huster]

I had always assumed that 3-significant-figure resistors were 1% or better, but things seem to be changing. I'm finding a lot of 3-significant-figure thru-hole resistors with 5% tolerances. So far, the color codes have always followed the standard 5% values (that is, no 1% values with a 5% tolerance).<p>SMT 1% resistors, aside from the 4-digit value markings (3 significant figures + number of zeros) are usually printed on a blue background while the 5% values are on a black background. Anybody find any variances on this?