What is the use of thermal reliefs on vias for a copper pour?

My EDA software (PCAD, but I guess others do this too) adds thermal reliefs on vias in a copper pour. What's the use? Vias aren't soldered.

November 24, 2023

Easier routing and fan-out of BGAs and other dense parts. Particularly when putting planes under the BGA.
Greater heat transfer to the planes on the PCB. You see this the most on QFNs and other packages with a ground pad on the bottom of the part in the center. This pad is intended to transfer heat to vias and then to the ground plane.
There is less chance for the via to get messed up due to plating, drill accuracy issues, or other PCB manufacturing problems (not a huge benefit, but a benefit nonetheless).

Lees verder: Zware koperen printplaat

#PCB manufacturing #PCB Materials

Olivier Smit

Oliver is een ervaren elektronica-ingenieur met kennis van PCB-ontwerp, analoge circuits, ingebedde systemen, en prototyping. Zijn diepgaande kennis omvat schematisch vastleggen, firmware-codering, simulatie, indeling, testen, en probleemoplossing. Oliver blinkt uit in het omzetten van projecten van concept naar massaproductie met behulp van zijn elektrische ontwerptalenten en mechanische vaardigheden.

What is the use of thermal reliefs on vias for a copper pour?

Olivier Smit

Olivier Smit

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