I am new to pcb design and I have to choose an SMD resistor to use in a project.

Currently, I have a library available (I use Altium) with these resistors:

*RES_0201*...

*RES_0402*..

*RES_0306*and

*RES_1206*

I understand that the numbers indicate the size (length and width) .. but I have a couple of doubts when choosing.

I need a 10k resistor on which a maximum of 20mA will flow .. i.e. Pdiss(max) = 4 W.

So I need to find out if one of the resistors I mentioned above can handle that power without breaking and causing damage.

Following this document ... I notice that on page 2 in "MAXIMUM RESISTANCE CHANGE AT RATED DISSIPATION" the maximum power dissipated is 0.4W (performed by MCA 1206). Being less than 4W .. I suppose I can't rely on those 4 resistors I wrote at the top.

Is this correct?

Did I read the datasheet correctly?

If this is correct, then I should look up (for example on DigiKey) and use an SMD resistor that holds more than 4 W and import it into Altium. This is not a problem, but what I am interested in is if I have reasoned correctly or not.

In the meantime, I also take this opportunity to ask if 4W on an SMD resistor is too much or not... I have never designed a ppcb so I have no idea what high and low values are. In any case, there are SMD resistors avaiable on DigiKey that can handle much higher power than this .. so I think there should be no problem.

Thanks!