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Through-Hole Assembly

Through-Hole Assembly -- Components are mounted by inserting leads into holes which are then covered by solder. 
Automated Through-Hole Assembly Manual Through-Hole Assembly 

We had traditional through-hole circuitry, with leads being directly threaded through pre-made 
holes in the printed circuit board. This was simple enough to be done by hand, but Ball Grid 
Array (BGA) PCB extremely inefficient in terms of optimizing space usage. 

Through-hole mounting techniques are now usually reserved for bulkier or heavier components 
such as electrolytic capacitors or semiconductors in larger packages such as the TO220 that 
require the additional mounting strength, or for components such as plug connectors or
electromechanical relays that require great strength in support.


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