Re: Questions about SMD passive components

Hello !

Kurt Harders wrote:

> Hallo Antti,
>
> Some simple rules: the value of esistors is printed for devices in the
> sizes 1206 and 0805. I prefer 1206 for prototyping. There are only
> little differences if you need resistors for digital purposes. Just
> take the cheap ones :-).
>

This isn't what I meant, exactly. You see, I know resistors come in specific
package sizes, such as the ones you listed above. It is the type of the
resistor, and technology, which puzzle me so greatly and make my strip my
hair out. Should I, for example, choose a thick film or a thin film resistor
to act as a serial resistor in an RC-circuit ? Or should it be a ceramic
resistor ? Can ceramic resistors be film-based at all ? What are metal film
resistors then ? Should I choose a similar type resistor to act as a signal
line terminator ?

>
> capacitors are a little more complex, but if you need pF there is not
> so much choice. Size again 1206, but there is no value printed on it,
> so keep it sorted. µF is a bigger problem. If it may be a polarized
> capacitor just choose an electrlytic one with sufficent valtage.
> If it comes to the 100nF for ICs i take ceramic ones.
>

Again, it's not the size or the capacitance which puzzle me, since
capacitance category (pF, nF, uF) mostly goes hand-in-hand with the size.
It's the same with non-SMD capacitors. But, there are tantalum capacitors,
aluminium ones, ceramic ones, multi-layer ones etc etc. Which one should I
choose as a bypass capacitor for an IC then ? Should I use a similar
capacitor to filter an audio signal that exists an IC and enters another ?
Is such "filter capacitor" even needed ?

The problem is that with the current knowledge I have, I cannot efficiently
browse the manufacturer pages for capacitors or resistors. I don't know
which technology options I should tick in order to be even able to select
the resistance/capacitance ranges :)

Greetings,
Antti Keskinen


.

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