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Do we need thermal reliefs for TO247 diode in 1oz copper plane?

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cupoftea

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Hi,
How little thermal reliefing can you get away with with a to247 Diode?
The attached is a TO247 diode (three pics at different zoom in levels) connecting to a ground plane of 1oz copper as pointed out.
(PCB screen grid id 1mm)
Can we just use an 80W soldering iron and not even bother with the thermal relief?...this isnt for production..just single prototype.
 

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