Although surface-mount technology is more common nowadays, many PCBs use mixed technology. Rather than using solder to secure components onto the surface of the board, through-hole mounting involves placing components into drilled plated holes on a bare PCB.
Through-hole plating is useful during the PCB prototyping and testing process, as components can easily be swapped out. Additionally, through-hole components are incredibly durable as they are soldered from both the top and bottom of the board — creating a strong physical bond. They also have a high environmental and power tolerance.
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