Guys
I like the response of NIKHILRAJ and Jnnewtom. Please sort out my concept. Please answer to my Qs. I really need that.
Thanks
There are many things that we need to know to answer your questions. For instance:
If there are no planes, why are thermals being considered? If there is to be a plane, is it significant enough to cause a large temp difference during reflow?
Why are you placing the resistor between the IC pin and +5V?
What is the resistance, and why have you chosen that?
How many layers is your board? If it is only two, this is probably a non-issue, if it is more with a connection through a via to an internal layer, you may want thermals.
Why 1206 SMD? Normally the size is chosen after the current draw is known.
What are the specifics of the input? Input impedance, protection, max V.
Is the resistor for current limiting for schottkies on a <5V device?
What are the max If of the diodes?
If all of these seem normal, you probably don't need any thermals.
These would be a start.
If you cannot answer these types of questions, then the answer to your questions are all "I am unable to determine an answer from the information given"