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Choice of resistors

Discussion in 'Electronic Basics' started by aman, Mar 8, 2005.

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  1. aman

    aman Guest

    Does anybody have ideas as to when choosing resistors what should be
    the criteria ? Right now for my design I am using all surface mount
    chip resistors.
    Axial resistors come in metal film, carbon film, wirewound and other
    forms. Is there any rule as to when to use what ? I think like a
    wirewound resistance is accurate but has high inductance. Is it right ?
    Are there any other concerns to be taken into account for the choice of
    resistors ?
  2. aman

    aman Guest

    Also I was recommended by someone in my earlier design about 2 years
    ago to use metal film resistors of 100ppm/C for my temperature sensing
    circuitry. But now I want to change by design to surface mounts. If I
    use chip resistors for the same circuit, are they as much temperature
    stable as metal film of 100 ppm/C ?
  3. In some applications, the inductance of a wire-wound
    resistor can matter. This is not common.
    Here are some criteria I have had to use while
    selecting resistors:
    cost to procure
    cost to mount
    stability versus temperature
    stability over time
    established reliability
    frequency response
    tendency to trap contaminants
    vibration and shock resistance
    equipment required to mount
    steady state power rating
    pulse power rating
    Take your pick of what is relevant to your application.

  4. The two attributes, "surface mount" and "metal film"
    are orthogonal. While the most ubiquitous SMD
    resistors are thick film, metal film parts are available.
  5. aman

    aman Guest

    My application of temperature sensing needs voltage gains to be fairly
    accurate. My present design uses metal films. If I am changing it by
    SMT isn't it better in general to use thin film and not thick film
    resistors ?

  6. I would agree that is the safest course in the
    absence of more information, and assuming
    the other requirements are ordinary.

    Your concern about inductance is likely to
    be misplaced in a temperature sensing circuit.
  7. aman

    aman Guest

    Thanks Larry
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