Through Hole Technology in PCB
                     Through Hole Technology in PCB
Sandra McCall
Writer at Top developments         
creates content to support 
https://top-developments.com/
The PCB technology to design PCB came to fulfill the need for a strong and 
effective circuit design. Throughout the evolution of the PCB until the 1980s, 
the electronic components that used to come contained metallic leads. These 
leads were used to fix and firm the components on the circuit by soldering them 
on the other side. For this purpose, blank space was left on the PCB circuit and 
holes were drilled. As a consequence, the technology came to be known as 
through hole technology. Though surface mount technology took over after 
1980s, the through hole technology has not lost its existence. This is because 
of some exclusive benefits of the through hole technology that surface mount 
technology cannot offer.
Features of through hole technology
The technology approach is simple. The electrical circuit is designed on a 
software and printed on a PCB. The PCB is then fabricated with 
conductive links etched on the PCB substrate that connects the electronic 
components to realize a circuit. Appropriate amount of spaces is left on the 
PCB to accommodate the components. Holes are drilled on the PCB so 
that the leads of the PCB are put in place and soldered. Soldering is done 
on other side of the board. As a result, the other side of the board is 
rendered fully or partially useless.
The through hole technology is particularly suited for leaded components. 
The leaded components then again used to come in two variants. One with 
axial leads and the other with radial leads. The axial leads are horizontal 
components with the leads at straight angle. These components lack the 
height factor but has considerable length. When used in a circuit, they 
result in a low height long length circuit. So, these components were 
particularly used when low heights were required.
Another variant of the components comes in radial form. Here, both the 
leads come out of the same side and are parallel to each other.
These components are generally vertical in nature. When used in a circuit, 
they increased the height of the circuit but reduced the height of the 
circuit. Therefore, if a circuit has to be small lengthwise as in case of a 
CFL, these are the components to be used. Alternately, the axial 
components are used as radial components by bending one of the legs in 
parallel to other leg. This way the horizontal configuration of the axial 
components can be changed to radial.
Advantages
This PCB is known for its strong soldering and firm contacts. They can 
bear good amount of shocks and jolts and other mechanical stresses.
The heat dissipation is good due to good amount of exposed conductive 
surfaces and large size of components.
The circuits can be given desirable dimensions bu employing the use of 
axial or radial components.
The testing of the circuits is easy as they are compatible with breadboard 
sockets.
Disadvantages
When compared to the surface mount technology, the size of the circuits is 
greater.
The data transfer speed is low in this kind of PCB.
The other side of the PCB is of little use due to lead soldering.
The cost of manufacturing is high due to drilling of holes in the board.
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