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Throughhole components are electronic components that have leads or terminals that pass through a printed circuit board (PCB) and are soldered on both sides. These components are commonly used in through-hole technology (THT), which is one of the two main methods of mounting components onto a PCB. The other method is surface-mount technology (SMT), where components are soldered directly onto the surface of the PCB.

Throughhole components are characterized by their larger size and the fact that their leads or terminals are inserted into holes drilled in the PCB. This allows for easier manual assembly and rework, as components can be removed and replaced without damaging the PCB. However, throughhole components take up more space on the PCB compared to surface-mount components, which can be a limitation in designs requiring high component density.

Common types of throughhole components include resistors, capacitors, inductors, diodes, transistors, integrated circuits (ICs), and connectors. These components are widely used in various electronic devices, from simple circuits to complex systems, due to their reliability and ease of assembly.

The process of assembling throughhole components involves placing the components into the PCB, aligning their leads with the holes, and then soldering them in place. This can be done manually using a soldering iron or automatically using machinery in mass production. Once soldered, the components are securely attached to the PCB and can withstand the rigors of operation.

In summary, throughhole components are essential elements in electronic design, offering a balance between ease of assembly and component density. Their use continues to be prevalent in many applications, despite the rise of surface-mount technology.