Through-hole technology (THT) is a method of mounting electronic components in which component leads are inserted through holes drilled in a printed circuit board (PCB) and then soldered to pads on the opposite side. It was a common method before surface-mount technology (SMT) became dominant, and it is still used for components that require strong mechanical connections or are not suitable for SMT due to size, power requirements, or heat dissipation needs. It is commonly used for larger components like electrolytic capacitors, connectors, and transformers.
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