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Why Consider Using Through Hole Printed Circuit Boards?

In the printed circuit board business, there are two primary ways to mount components onto the circuit board: through-hole mounting and surface mounting. Through-hole mounting is the older technology and requires the circuit board manufacturer to drill holes through the PCB and place leads into the holes. More recently, surface mounted technology has taken over the field.

Through-Hole Components

Through-hole components come in one of two types of leads, radial and axial. Axial through-hole components run along the axis of symmetry of the component while radial components protrude in parallel from the same surface on a board.

Components of Surface Mount Technology

When you look at any modern PCB design, you will see SMT technology in most instances. Surface mount technology (SMT) is the most commonly used technology today. These types of boards and components have very small or no leads at all as their primary purpose is to be soldered directly on the surface of a PCB during the design process. This method allows for components to be much smaller, allowing for greater density and better overall performance on a smaller circuit board.

With surface mounting offering so many benefits, why even consider through hole flex printed circuit boards?

The reason is that through hole mounting offers stronger mechanical bonds. This makes through hole flex printed circuit boards the better option for devices that are designed to undergo major stresses, like sudden accelerations, collisions, or extreme temperatures. This makes them worth considering for military, automotive, and extreme sports applications.

Yun Industrial Acme PCB Assembly is capable of two types of printed circuit board assembly services. They are full and partial turn-key services. Full turn-key covers all aspects of PCB fabrication and assembly, including manufacture of PCBs, parts procurement, quality inspections, and final PCB assembly.

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Before the 1960s, the through-hole assembly process for mounting components onto printed circuit boards was the only game in town. It was labor-intensive and required a lot of space, but it was the only option. That all changed with the rise of surface mount technology (SMT), which allows for components to be mounted directly onto a printed circuit board’s surface. Since SMT doesn’t require drilling holes through a PCB, its components are much smaller and can be mounted on each side of the board. The result is a denser, smaller PCB that can perform much better than a PCB using through-hole technology.

When SMT came on the scene, many engineers believed it would harken the death of through-hole PCBs. However, while SMT does reign supreme, through-hole is still with us today. In very specific circumstances, through-hole PCBs are a better choice than their SMT counterparts.

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Through-hole PCBs may be bigger and clunkier than SMT PCBs, but they do offer up one important advantage. Through-hole components are attached far more securely than SMT, which gives them a much stronger connection between layers. SMT connections are strong enough for the vast majority of products that people use in their day-to-day lives, but for machines that must operate in extreme environments, through-hole is the more reliable and stable option.

For example, through-hole PCBs can be commonly found in machines in the military and aerospace industries. Oftentimes, these machines must survive extreme temperatures, forceful collisions, and rapid accelerations. Through-hole is the ideal reliable and resilient mounting option for these types of products.

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The other area where you are most likely to find through-hole mounting is in product prototypes. Through-hole is often preferred in prototyping, because it is much easier to adjust and replace components as the prototype undergoes testing and design alterations. If you are dreaming up an exciting new product, you’ll want to reach out to a printed circuit board vendor that is adept at through-hole mounting. This will give you more flexibility as you put the prototype through its paces.

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No matter what your industry or product line, it is smart to look for a printed circuit board manufacturer with both SMT and through-hole experience. This will allow you more choice and more control over your final product. At ACME PCB Assembly, we offer extensive experience in both SMT assembly and through-hole assembly.

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