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thermal issues: surface mounted on 1" x 1" FR4 board

kellogs

Jan 7, 2014
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Jan 7, 2014
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A number of parts are rated at certain thermal impedance with a note, something along the lines of
surface mounted on 1" x 1" FR4 board
like in this datasheet for instance - https://www.tme.eu/Document/8ae9fea82a7cb44d4c881a980e95a2fe/siss05dn.pdf

Does this mean that in order to achieve the stated thermal impedance (63C/W in this case) an 1 by 1 inches (exposed? free of any other parts?) copper square needs to be centered around the part, or more likely only around the biggest pad of the part ? Or something else ?

Also, how far apart would one place 4 of such parts in order to achieve the 63C/W ?
 
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