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PCB/PCBA knowledge
Step-by-Step Guide to SMT PCB Assembly

Today, we’ll discuss a topic known as SMT PCB assembly. This might sound like a big and complicated topic but don’t worry. We’ll easily explain everything. 

Surface Mount Technology, or SMT, is a type of putting together circuit boards. PCB stands for Printed Circuit Board, which is the board that has all the electronic parts on it. 

Manufacturing electronic gadgets like smartphones, tablets, and PCs relies heavily on SMT PCB assembly. Special machines attach small parts like resistors, capacitors, and microchips to the PCB. This makes the devices work properly and look neat. 

We will learn more about SMT PCB assembly and its advantages and disadvantages in the rest of this guide. 

Are you ready to learn? Let’s get started!

Table of Contents

What is SMT PCB Assembly?

SMT PCB Assembly
SMT PCB Assembly

One method of creating printed circuit boards is SMT PCB assembly.

It stands for Surface Mount Technology, meaning tiny parts like resistors and capacitors are put onto the board without sticking through it. This makes the board smaller and faster!

It’s like building a puzzle with tiny pieces. SMT assembly is used in computers, phones, and toys!

What is SMT (Surface Mount Technology)- SMT Assembly Factory Tour

Features of SMT PCB Assembly

SMT PCB assembly is a great alternative for creating circuit boards because it offers some fascinating features.

Let’s check them out!

Small and Compact: 
Compared to conventional through-hole components, SMT components are significantly more compact and smaller. This means that more components can be fitted onto a smaller PCB.

Highly Automated: 
SMT assembly is more swift and effective than through-hole assembly since it is a highly automated process. This also reduces the risk of human error.

Low Profile: 
SMT components sit close to the PCB’s surface, making them low profile. As a result, they are better suited for portable electronics and take smaller amounts of space.

Less Solder Required: 
SMT components require less solder than through-hole components, meaning less waste and a lower chance of defects.

Lighter Weight: 
Since SMT components are smaller and require less solder, SMT PCBs are lighter than through-hole PCBs.

Advantages of SMT PCB Assembly

When it comes to creating circuit boards, SMT PCB assembly has several benefits. Here are some of the most important ones:

Greatest Flexibility in PCB Construction:
With SMT assembly, it is possible to place components on both sides of the board. This allows for more complex designs and greater flexibility when building circuits.

Improved Reliability and Performance:
SMT components are smaller than through-hole components. This is because they are mounted directly onto the surface of the board. This results in better heat dissipation, improved signal integrity, and higher reliability.

Smaller, Lighter Boards:
SMT PCBs are perfect for compact electrical devices without drilling holes since they are lighter and smaller.

Disadvantages of SMT PCB Assembly

SMT assembly has a lot of benefits, but there are also some drawbacks to take into account. Here are some things to keep in mind:

Generally, the Power Is Small:
Since SMT components are generally smaller than through-hole components, they often have lower power ratings. This means that they may not be suitable for high-power applications.

Small Volume:
SMT components are small and require precise assembly.

Easy to Broken:
Because SMT components are delicate, they can be easily damaged or broken if mishandled during assembly. This means extra care must be taken to install and soldered onto the PCB properly.

What is the Process of SMT PCB Assembly?

SMT PCB Assembly Process
SMT PCB Assembly Process

Here are the steps involved in SMT assembly!

  • The PCB is first printed with solder paste. Before being soldered onto the board, the components are held in place by a sticky substance called solder paste. The solder paste is then applied using a stencil printer, a specialized device.
  • Next, a pick-and-place machine places the components on the Board. Each component will be picked up by this machine, designed to position it in the appropriate location on the PCB. 
  • A device known as a reflow oven processes the PCB after all the components have been installed. The solder paste is heated in the oven until it melts and adheres the components to the PCB.
  • The solder hardens once the oven cools down and keeps everything in place.
  • The PCB then goes through a cleaning process to remove any excess solder or dirt. After cleaning, the board is inspected for any defects or issues. If there are any problems, they will be fixed in a process called rework.

Now you know how SMT assembly works! 

It’s amazing how all those tiny parts can be precisely placed onto a PCB.

How Much Does SMT PCB Assembly Cost?

SMT PCB Assembly costs range between $10 and $50.

How to Find an SMT PCB Assembly Supplier?

SMT PCB Assembly Supplier
SMT PCB Assembly Supplier

Consider these points while you search for a new supplier:

Ask Around:
Do you know anyone who has used an SMT assembly supplier before? They may have some recommendations for you.

Trade Shows:
If you attend trade shows related to your industry, SMT assembly suppliers may be present.

Industry Directories:
There are directories out there that list suppliers for various industries. You can find an SMT assembly supplier that way.

Considerations When Looking for SMT PCB Assembly Services

When seeking SMT PCB assembly services, there are certain factors to consider.

Make sure the company you choose has experience in SMT assembly. You can ask for examples of previous work.

Look for a company that has a reputation for quality work. You can check reviews or ask for references.

Consider the cost of the services. Some companies may be cheaper but may provide a different level of quality.

Make sure the company you choose is easy to communicate with. They should be able to answer any questions you have and keep you updated on the progress of your project.

Turnaround Time: 
Consider how long it will take the company to complete your project. You want to make sure they can deliver on time.


We just learned a lot about SMT PCB assembly. 

It’s a really cool process where tiny parts are placed on a circuit board. The cost can vary depending on how many parts and boards you need, but you can always find a supplier to help. When looking for SMT assembly services, check for quality and experience. 

Now you know how SMT PCB assembly works and how to find a supplier. So go out and make some awesome electronics!


SMT PCB assembly is a method of creating printed circuit boards. It stands for Surface Mount Technology, meaning tiny parts like resistors and capacitors are put onto the board without sticking through it. This makes the board smaller and faster!

  • Small and Compact
  • Highly Automated
  • Low Profile
  • Less Solder Required
  • Lighter Weight
  • Experience
  • Quality
  • Cost
  • Communication
  • Turnaround Time

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