What are primary and secondary sides of PCB?

I am designing a 2 layer PCB with components on both side of it. SMT components are one one side of PCB, but TH (door gat) components are on both sides. I need to understanding something mentioned by the supplier called primary and secondary sides.

November 23, 2023

De primary side is the side that has most of the components, especially the ICs. The most common soldering technique these days is reflow soldering. It is simply easier to get precision temperature profiles on one side of the board only.

De secondary side can also support components, but

it’s harder to control the temperature precisely, en
gravity works against you as the solder paste begins to melt and the components on the underside of the board want to fall off.

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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.

Olivier Smit

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What are primary and secondary sides of PCB?

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