SMD Resistor Values

Thread Starter

Lee Chris

Joined Oct 12, 2015
9
I have a simple question:

Is there specific resistor values for SMD resistors similar to those values on normal carbon resistors?
Where can I find this list of values?
 

Thread Starter

Lee Chris

Joined Oct 12, 2015
9
Thanks!

I'm seeing values as granular as these. Are they normal for SMD?

4.7
5.1
5.6
6.2
6.8
7.5
8.2
9.1
10
10.2
10.5
10.7
11
11.3
11.5
11.8
12
12.1
12.4
12.7
13
13.3
13.7
14
14.3
14.7
15
15.4
15.8
16
16.2
16.5
16.9
17.4
17.8
18
18.2
18.7
19.1
19.6
20
20.5
 

shiva007nand

Joined Sep 25, 2015
38
make sure tolerance for SMD components value,
example 104 means 100 K Ohm with +-5% of tolerance
and 1004 means 100 k ohm with +-1% of tolerance.
 

Roderick Young

Joined Feb 22, 2015
408
It costs about the same to make a 1% SMD resistor as a 5% one, so generally, what we would do for product design is specify 1% resistors, but if possible, choose from a preferred set, so that less resistors needed to be stocked. You can look up E96 resistor values here http://www.radio-electronics.com/info/data/resistor/e-series-e3-e6-e12-e24-e48-e96.php to see the standard ones. 6.81k, for example, was a preferred value, because it closely matched the old 6.8k of 5% and 10% resistors. If a design needed 6.5k, we would try to see if it would tolerate 6.81k, before using 6.49k, even though 6.49 was technically a standard value.

If you're ordering individual resistors from (say) Mouser, you'll see that the 1% ones do not cost more, and moreover, that it costs almost the same to buy 10 resistors as 1 (because it's all handling charge for something so cheap).
 

crutschow

Joined Mar 14, 2008
24,362
The available resistor values depend upon the tolerance of the resistor.
±1% resistors have many more values that ±5% types.
The list you posted is for ±5% resistors.
 

OBW0549

Joined Mar 2, 2015
3,207
It costs about the same to make a 1% SMD resistor as a 5% one, so generally, what we would do for product design is specify 1% resistors, but if possible, choose from a preferred set, so that less resistors needed to be stocked.
Good point. And sometimes, in cases where using a 1% resistor instead of 5% can eliminate a trimming operation or a calibration step, they actually can be cheaper than the 5% part. The same goes for 0.1% resistors, which are not terribly expensive anymore.
 
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