I have a couple of questions on the LT1529-5 thermal resistance.
Q1: In the datasheet package information section, we find the theta J-A = 30 degrees/W for Q package.
What is the conditions under which the measurements were taken to determine this ?
Was the tab on the package contacted or soldered to a copper layer with some area, or was the package made stood in the still air with no connection to any external metal layer?
Q2: This may not be very meaningful, but please let me ask.
Is a resistance value for thermal resistance from the junction to the on the package、assuming
the tab has no connection to any external metal layer?