Through-Hole PCB Assembly

PCB assembly is the process of attaching electronic components to a bare printed circuit board, like the one below. The electronic components that are attached and assembled onto the board interconnect and interact through the use of the conductive circuit board.

copper-core-pcb

Example of a Bare Copper Core PCB

 

Assembly onto a circuit board can be constructed in 2 ways: through-hole and surface-mount, each with their own advantages and uses.

Today we’ll look at through-hole PCB assembly.

 

Through-Hole History

With through-hole assembly the leads (sometimes also called pins) of the components are pushed through holes in the circuit board and soldered on to pads on the opposite side. The bare board PCB would have a hole for each lead wire of each component. The method of through-hole assembly is done with the use of mounting machines (wave solder or selective solder) but can also be done by hand (manual assembly).

This method was especially popular from the 1950s to the 1980s; in the 50s, through-hole construction replaced the more prevalent point-to-point construction. In the 1980s, surface-mount technology became more popular when small surface mount parts began to be used more increasingly, due to smaller board requirements and lower production costs.

The bonds formed by through hole technology are stronger than surface mount assembly, but current technologies require smaller geometries on the PCBs and more complicated electronic components that require SMD technologies.

Disadvantages of Through-Hole PCB Assembly

Through-hole PCB assembly limits the available area of the circuit board, reducing the ability to add signal traces on multi-layered boards and require larger PCB area.

It is , therefore, not the most elegant of assembly techniques and not as widely used currently, especially as electronic components and boards become smaller, more complex and more compact. Through-hole mounting is usually now done only on bulkier components and applications that require the additional strength that through-hole provides. It is also very common to see a combination of through-hole and surface mount technology in the same application.

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One comment on “Through-Hole PCB Assembly
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