Choice of resistors

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 ?

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: size cost to procure cost to mount stability versus temperature stability over time accuracy linearity 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.

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

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 ?

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.

Thanks Larry