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Reference.org
Through-hole technology
open-in-new
<p>In <a href="/facts/Electronics/E4JhgISq">electronics</a>, through-hole technology (also spelled "thru-hole") is a manufacturing scheme in which <a href="/facts/Lead_(electronics)/nW8ICkYs">leads</a> on the <a href="/facts/Electronic_component/F3NBVv4Q">components</a> are inserted <a href="/facts/Through_hole/zkt0gnbV">through holes</a> drilled in <a href="/facts/Printed_circuit_board/muSR2p43">printed circuit boards</a> (PCB) and <a href="/facts/Soldering/fod6dLHD">soldered</a> to pads on the opposite side, either by manual assembly (hand placement) or by the use of automated <a href="/facts/Insertion_mount_machine/A9PEW4nv">insertion mount machines</a>. </p>