What is a THT PCB?
A THT PCB is a printed circuit board that uses through-hole technology to mount components. This type of PCB is characterized by drilled holes that go all the way through the board. The leads of electronic components are then inserted into these holes and soldered in place.
THT vs. SMT vs. SMD
The main difference between THT PCB, SMT PCB, and SMD PCB mounting is the way in which components are mounted on the circuit board.
THT (Through-Hole Technology)
In THT PCB mounting, component leads are inserted into drilled holes and soldered in place. This type of mounting is typically used for more significant components that cannot be placed using SMT.
Advantages
– THT PCB mounting is a tried-and-tested technology that has been used for many years.
– It can accommodate more significant components that might not be able to fit using SMT.
– THT provides more mechanical support, which can be beneficial for specific applications.
Disadvantages
– THT PCB mounting is a more manual process and, therefore, can be more time-consuming and expensive.
– There is also a greater chance of human error.
SMT (Surface Mount Technology)
In SMT process, components are placed on the surface of the circuit board and soldered in place. This type of mounting is typically used for smaller components.
Advantages
– SMT is a more automated process and, therefore, can be faster and less expensive.
– There is less of a chance for human error.
– SMT leaves more room on the circuit board, which can be beneficial for specific applications.
Disadvantages
– SMT can be more difficult to work with for more significant components.
– The process of reworking SMT components can be more difficult and expensive.
SMD (Surface Mounted Devices)
An SMD or surface-mount device is an electronic device where the components are mounted directly onto the surface of a PCB. Surface-mount technology, or SMT, is the method used to produce an SMD. SMD components are smaller and lighter than through-hole components, making them ideal for use in miniature electronic devices and products where space is at a premium.
Advantages
– Reduced assembly time
– Increased reliability
– Reduced board size and weight
– Increased component density
– Automated placement and soldering
Disadvantages
– More difficult to hand solder
– Requires special equipment for assembly
– Can be more expensive than through-hole components
How to choose THT or SMT?
The answer to this question depends on several factors, including:
– The size and type of components being used
– The amount of space available on the circuit board
– The budget for the PCB assembly process
– The turnaround time for the project
For example, THT PCB mounting would be the best option if you are working on a project requiring large components. If you are working on a budget and need a fast turnaround time, SMT would be the best option.
It’s important to note that not all PCB assembly facilities offer both THT and SMT. This is something you will need to consider when choosing a facility to work with.
At the end of the day, the best way to determine which type of mounting technology is right for your project is to consult with a professional PCB assembly manufacturer. They will be able to help you choose the best option based on your specific needs.
Advantages and Disadvantages of THT PCB
The main advantage of THT PCB is that it provides more mechanical support. This can be beneficial for certain applications.
The main disadvantage of THT PCB is that it is a more manual process and, therefore, can be more time-consuming and expensive. There is also a greater chance for human error.
Where are through-hole PCBs used?
THT PCBs are typically used in applications where:
– Large components are required
– More mechanical support is needed
– A higher degree of precision is not necessary
Some examples of industries that use THT PCBs include:
– Aerospace
– Automotive
– Medical
What is the process of THT?
The process of THT typically involves the following steps:
1. Drilling holes in the circuit board
The first step is to drill holes in the circuit board. This is typically done using a CNC machine.
2. Inserting leads into the holes
The next step is inserting the components’ leads into the holes.
3. Soldering the leads in place
The third step is to solder the leads in place. This can be done using a soldering iron or a reflow oven.
4. Inspecting the solder joints for quality
The fourth step is to inspect the solder joints for quality. This is typically done using a microscope.
5. Cleaning the circuit board
The final step is PCB cleaning. This is generally done using a solvent such as an isopropyl alcohol.
Considerations for THT designs
When designing a circuit board that will be assembled using THT, there are a few things to keep in mind:
– Make sure the holes are the correct size for the leads.
– Use plated through holes to ensure good electrical contact between the lead and the circuit board.
– Avoid using vias underneath components to prevent solder shorts.
– Use a solder mask to protect the exposed copper and to help keep the solder joints clean.
– Use a silkscreen to identify the component values and locations.