SMD Resistor Values

Discussion in 'General Electronics Chat' started by Lee Chris, Oct 13, 2015.

  1. Lee Chris

    Thread Starter New Member

    Oct 12, 2015
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    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?
     
  2. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    1,466
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    Google "SMD resistor values".
     
  3. Lee Chris

    Thread Starter New Member

    Oct 12, 2015
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    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
     
  4. OBW0549

    Well-Known Member

    Mar 2, 2015
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  5. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Or go to DigiKey.com or other industrial supplier.
     
  6. shiva007nand

    Member

    Sep 25, 2015
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    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.
     
  7. Papabravo

    Expert

    Feb 24, 2006
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  8. Roderick Young

    Member

    Feb 22, 2015
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    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).
     
  9. crutschow

    Expert

    Mar 14, 2008
    13,901
    3,518
    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.
     
  10. bertus

    Administrator

    Apr 5, 2008
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    InspectorGadget likes this.
  11. OBW0549

    Well-Known Member

    Mar 2, 2015
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    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.
     
  12. RichardO

    Well-Known Member

    May 4, 2013
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  13. kubeek

    AAC Fanatic!

    Sep 20, 2005
    4,720
    810
    They will not match because many of the values are rounded off.
     
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