Why does the Through Hole PCB play the most important role in PCB Design?

By Mer-Mar Electronics Date posted: Last updated: October 17, 2022
Through Hole PCB

The field of technology is so dynamic that you also have to grow to synchronize its steps. From personal use to industrial use, electric technology spreads its wings in every aspect of our life. As the acceptance of electronic material is almost all over the technology, it gets sophisticated gradually.

To make it elegant, the need to minimize the circuit size is a concern. But organizing all the parts of the circuit becomes challenging until the Through-hole PCB Assembly is found out. It is used in most tiny circuits, like a capacitor to the microchip. Getting curious about this incredible mounting process? Over this post, we discussed it thoroughly, so go through it.

What is Through Hole PCB assembly?

Through-hole PCB assembly is the most reliable PCB assembly process which can easily bear any kind of stress. In this process, the components of the soldering are drilled with the lead, not only at one point but all over the board.

Through-hole assembly is sometimes denoted as a TH assembly also. The through-hole assembly may be plated or non-plated based on layers of the material.

Components of Through-hole assembly:

There are several components present in an assembly board but the main components of the through-hole assembly are classified into two types, those are-

Axial Lead Components:

This applies in the multilayer PCB assembly. Here all mounting is done in a straight-line pattern where all the mounting wires are inserted through one side and then routed through the other side. The opening and ending are separate. In this process, all the components of the circuit are very closely placed.

This type of component is used mainly for lightweight devices like LED resistors because of their compactness.

Radial Lead Component:

In radial components, the differential part of it here leads are drilled on any one side of the board. Here the assembly component is not all time placed in the circuit, they may come out of the board. Very useful for tiny electronic devices which need high-density electronic boards to reduce space like capacitors.

Reasons behind Why does the Through Hole PCB assembly play the most important role in PCB Design:

There are other mounting processes available in the market like the SMT PCB assembly, but the experts are recommended the through-hole PCB for the best PCB design. The reasons for through-hole PCBs’ importance are numerous. But most prominent reasons are-

Simple Prototype:

The prototype of the through-hole PCB is very simple and easy to use. It also has a faster prototype than another mounting process. The soldering of this process is effortless because it can be pinned by wave soldering or by hand soldering. The prototype can manage according to the need of the circuit. The best part is to make a testing design, not even making the circuit board.

Resistance trait:

The through-hole assembly can successfully withstand any kind of mechanical and environmental stress. It’s a very good criterion for the electric devices which work in harsh conditions like in aerospace, in martial service, etc. In these fields, the device’s operating temperature is very high, and there is constant physical friction present. Still, the through-hole assembly can meet the services by its high working potential.

Power tolerance:

Not only environmental stress, but through the hole, the assembly can resist high electrical energy also. Some electronic gadgets require a great power supply for their functioning. But no ordinary PCB can tolerate such a high current. In this case, the through-hole assembly acts as a blessing for that area.

Good internal connection:

In through-hole assembly, the internal bond between the components of the circuit and board are very strong, which is very important for the coordination of the device. Coordination helps work in the highest possible efficiency by minimizing stressful situations, high-energy environments. For this reason, the success rate in the capacitor, semiconductor, and other detailed equipment is high.


Durability is important to work with a divide for the distant future. This is a very vital criterion for a lengthy time project like an aerospace mission, etc. Strong soldering, good physical bonds make the circuit run for a long time. Not only that other good quality of the through-hole, like the resistant power, makes the durability of it long.


The through-hole assembly is cost-effective for use. The long durability, stress tolerance is helping to make the circuit’s dysfunction rate less, which reduces the repair cost. On the other hand, you can test the prototype in advance, so the chance of error in designing also reduces, which saves money to some extent. Although at the initial level, through-hole seems costly, it is worth it because it reduces the repair cost, which ultimately decreases the overall expenditures of the circuit.


One of the hardest decisions for designing the PCB Assembly circuit board is to choose the right mounting process. One type of mounting can fulfill some criteria, and the other types can meet some. So, it’s totally your preference to choose the right according to your necessity on the board. But we can assure you Through-hole assembly is always a good choice if you pick it. And you can also see it on your own by reading the above article. So, consider the power of through-hole assembly before taking the major decision of choosing the layout of the PCB.

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