Circuit Board Assemblies

20 Jul, 2022

By ren

Techniques and benefits of Circuit board assemblies

What do you know about circuit boards?

In many cases, circuit boards work as passive platforms that support and link the various system components. There is a broad spectrum of circuit boards, from single plastic boards with conductive materials to more complex multilayer PCBs. Printed circuit boards are helpful for mechanical support. Single- or double-sided and even multilayered are all possible configurations. They may be either stiff or flexible, or a combination of both. Electrical components are attached to the printed circuit board during the assembly process. Several mechanical and hand-operated methods are involved in the circuit board assembly process. A board maker may manually or automatically complete each inquiry step during manufacturing. This article discusses the three fundamental technologies used in Printed circuit board assemblies

Circuit Board Assemblies
  • Thru-Hole Technology (THT) Assembly Process
  • Surface Mount Technology (SMT) Assembly Process
  • Mixed Technology

The explanation of each step that is involved in the process of printed circuit board assemblies is here:

Thru-Hole Technology (THT) Assembly Process:

Through-Hole Technology (THT) is a technique for constructing electronic circuit boards that involve inserting pin-through-hole (PTH) parts onto printed circuit assemblies through holes in the panels. The early methods of assembling the electronic device, such as step fabrication, were eventually overtaken by through-hole technology. Overviews of the three most important stages of the Through Hole Technology (THT) printed circuit assembly are here:

1. Component placement:

This process is carried out physically by experienced members of the electronics engineering department. The PCB assemblies design files provided by the customer need the engineers to install the other components in the appropriate part placement as soon and accurately as possible. For ensuring high quality, the element placing must be done in a manner that complies with the rules and operating criteria of the through-hole installation procedure.

Inspection and Correction of Errors:

The board moves to the transport frame after the installation of parts. Once in place, the board and its features will be inspected automatically to ensure proper installation. When problems with the positioning of components are discovered, it is simple to get them fixed immediately. After all, this phase of the printed circuit board assemblies process occurs before the soldering step. 

Wave Soldering:

After the components of the THT have indeed been thoroughly cleaned, you may now use the soldering iron to join them to the circuit board. During the wave soldering process, the circuit board is moved slowly and carefully over a wave of liquid solder that has been heated to a temperature of around 480 degrees Celsius.

Surface Mount Technology (SMT) Assembly Process in Circuit Board Assemblies:

Solder paste printing is used to attach electronic components directly onto the base of printed circuit board assemblies with a technique known as surface mounting technology (SMT). It is a way of building circuit board assemblies. 

Surface-mount devices are electronic devices manufactured in this manner (SMDs). A surface-mount technology (SMT) component is frequently more compact than its through-hole relative.

Paste, placing, and reflowing are the three most crucial procedures involved in surface mounting techniques. 

1. Solder paste printing:

A solder paste printer is used to apply solder paste to the circuit board. When you use a solder screen, a pattern, or a stencil, you ensure that solder paste will be accessible on the precise locations where the components are going to be put.

2. Component Mounting:

Due to the friction of the solder paste, the printed circuit board (PCB) will be automatically dispatched to the pick-and-place equipment as soon as it comes out of the solder paste printer. There, elements or ICs will be put on the pads that relate to them. Mount Components are attached to printed circuit boards (PCB) using component reels located inside the device. Parts are fed into the machine by rotating component spools that hold the other components. The device then swiftly adheres the elements to the board.

3. Reflow soldering:

Following the component placement, the circuit board travels through a reflow oven that is 23 feet long and maintains a range of approximately 500 degrees Fahrenheit. It is necessary to heat the solder paste until it melts to create solid and dependable junctions between the elements and the base of the circuit board. The key to achieving this goal is using a reflow oven, which first brings the solder to the appropriate temperature and then allows it to return to its solid state.

Mixed Technology:

It is unlikely that PCB assemblies that include one component would be able to do such complicated jobs successfully. As a result, to accomplish this goal, you will need to use a circuit board that combines surface-mount and through-hole components.

Because these boards contain both through-hole and surface mount components (SMD), the two kinds of component mounting technologies must work together. On the other hand, Soldier paste printing is a complex procedure often impacted by many factors. Therefore, properly organizing the sequence of thru-hole and surface mounting technology is of the utmost importance. 

In these situations, multi-technique PCB assembly is required:

1. Single Side Mixed Assembly:

A board with just one side exposed typically has three primary PCB layers that may be constructed on it. The first layer is the conducting substance, the second thin layer is a solder mask that protects the circuit from the circumstances of the outside surroundings, and the third thin layer is the silkscreen. As a result of its straightforward and fundamental PCB design, the manufacture and production of a single-sided board may be accomplished at a relatively low cost and with relative ease. 

2. One Side SMT & One Side THT:

Because chemicals will add to the overall cost of the PCBA and may cause soldering problems, this PCB assembly process is not advised. Even though the printed circuit board assemblies used for surface-mounted devices often have lower prices than those used for through-hole mounting, the initial capital expenditure required for the apparatus is frequently more. In addition, the PCB design, manufacturing, ability, and expertise generally required for surface mount technology (SMT) is often higher than that necessary for through-hole mounting.

Double-Sided Mixed Assembly:

In the instance of double-sided mixed printed circuit assembly procedures, there are two possible outcomes: PCBAs that have adhesives applied to them or PCBAs that do not have adhesives applied to them. The use of chemicals in PCB construction raises the overall price. In addition, throughout this printed circuit board assemblies process, heating must be carried out three times, which often results in inefficient use of resources. There is a wide variety of electronics and uses of double-sided printed circuit boards (PCBs), some examples of which include led lighting, coffee machines, amplifiers, and automotive consoles, amongst many more.

EuropePCB offers economical PCBA educational services and electronics engineering organizations needing PCB fabrication and prototyping PCB assembly.

Benefits of Professional Printed Circuit Board Assemblies:

  • It assembles printed circuit boards by a professional means. Using the finest substrate materials and construction equipment. If you're looking for a company that's been operating for a long and has good reviews, you'll find it. It's important to engage with a company that can provide key components and assembly services to ensure a high-quality product.
  • Even professionals developing printed circuit boards for many years may make mistakes. If an error occurs in constructing all of your firm's circuit boards, it might cost you a lot of cash. It's better to have a specialist handle this.
  • If you had to produce all of the PCBs at your plant, consider how much time you would be investing. You require more staff to maintain pace with the production and assembly requirements. 
  • In addition, consider the manufacturing costs that you would incur if you built the boards yourself instead of hiring someone else to do it for you.You will want a lot of free space for manufacturing a printed circuit board. So. You should hire a professional manufacturer.
  • After the printed circuit board assembly has been finished, the PCB manufacturers will be able to arrange for it to be delivered straight to your doorstep. The amount of time it takes to send your order might vary, but when you pick a reputable supplier like Superior Circuits, the process is often quick. It indicates that you will promptly deliver the circuit boards you need.

Read more: Communication Circuit Board


As you know, Printed circuit board assembly is a process of manufacturing circuit boards. You want to be confident that you are selecting just the finest components for the printed circuit board assemblies. You can contact EuropePCB for high-quality PCB assembly services.


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