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    Why use Trough-hole technology in PCB design?

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    Pau Monfort

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    Tendentially the way of technology always tends to evolve and to abandon the most obsolete technologies in favor of the most recent and performing ones; The latest available technique is surface mount technology (SMT), ie surface mount technology; now the question arises: Why use through-hole technology in PCB design?

    Dispositivi Through-hole (THM)

    Through-hole components have two different types of terminals: radial and axial. The axial ones have the terminals arranged on the symmetry axis of the component itself, unlike the radial components which require a component parallel to the board.

    Dispositivi surface mount technology (SMT)

    In recent times, in the design in modern PCB circuit design, surface mount technology is by far the most used technology.

    The advantage on the positioning of the terminals is extremely useful, as they are extremely small in size and are soldered directly to the board.

    Comparison between Through-hole (THM) and Surface Mount (SMT) technology

    The slightly older technology (THM) has strengths and weaknesses. It benefits from simpler prototyping, stronger physical connections, greater heat tolerance and better power management skills; the disadvantages are the high cost higher due to the holes necessary for operation, it uses more spaces in the board, it has a greater complexity in the assembly and lower speeds.

    Now we will analyze the same parameters for the new technology (SMT)

    The advantages are: the smaller dimensions of the card thus allowing the use of cards with higher density, the high speeds, a fast and low-cost assembly, and the lack of holes on the card thus allowing its production at much lower prices.

    The downsides are: less resistant physical connections, lower heat resistance, lower power handling capacity and finally DFMs.

    It is easy to see the advantages of the surface mount technology, allowing the assembly with faster components and with a lower cost, it has rapidly spread on the market and axis is also preferable for applications related to IoT; therefore towards the future.

    The smaller size therefore allows you to create very small and applicable products even where space is limited and therefore can be installed in any environment.

    Trought-hole technology is also being replaced because speeds are noticeably slower, and these days the industry is geared towards immediacy and speed.

    Before carrying out the project it is possible to reproduce the circuit on a bradboard.

    The choice of Trought-hole technology is the most common in aerospace and military sectors because it is more resistant, better withstand heat and better manage powers. The greater strength is due to the double welding: that is, both on the upper and lower side. This technology is also preferable for billboards or stadiums and sports halls as they are better resistant to atmospheric agents.

    Many industrial machines still exploit this technology for the same reason, their endurance even in extreme conditions; this allows a still important use of the Trought-hole

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