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Performance differences between large and small caps/resistors

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shadewind:
Are there any differences in the performance of, let's say, a 0402 resistor and an 0805 resistor with all things being equal such as tolerance with the exception of power handling? I'm wondering the same about caps. To sum it up, is there any drawback in going down in size except for assembly and perhaps reliability issues?

alm:
Voltage rating will be lower for smaller parts. With capacitors, the dielectric may also be inferior (eg. high K) to achieve the same capacitance in a smaller package.

w2aew:

--- Quote from: shadewind on November 07, 2011, 05:21:05 pm ---Are there any differences in the performance of, let's say, a 0402 resistor and an 0805 resistor with all things being equal such as tolerance with the exception of power handling? I'm wondering the same about caps. To sum it up, is there any drawback in going down in size except for assembly and perhaps reliability issues?

--- End quote ---

The parasitics will differ, thus the high frequency behavior will differ between them.  You'll have to consider things like equivalent series inductance, shunt capacitance, self-resonant frequency (for caps), etc. if you are operating at high frequencies.

For caps, larger values aren't going to be as available in the smaller size.  For example, a given value of capacitance might be available with an X7R dielectric type for a larger size, but only available with a Y5V or Z5U dielectric in a smaller size (higher dielectric constant, but poorer tempco). 

mobbarley:
The end of this is a great intro to the inductance of package sizes

http://www.intersil.com/data/an/an1325.pdf

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