A comprehensive introduction to THT through-hole technology
Through-hole or THT technology is drilling holes into a PCB and electronics components are supposed to solder in that hole to connect tracks on PCB. It is an older technique than surface mounting. Despite the fact that it is an older technology, thru-hole PCB assembly has advantages. Through hole mounting strengthens the bonding between a circuit board and its components, resulting in more robust, shock-resistant, and impact-resistant devices.
Why Through Hole PCBA technology:
PCB design evolved from single-sided boards to double-sided boards, and finally to multi-layer boards. To match the needs of contemporary electronics, through hole assembly is tough. In today’s PCB production, SMT technology has virtually overtaken through hole fabrication. However, through hole assembly is still required in some applications, such as electrolytic capacitors, connectors, and big transformers.
PCB DIP connectors have better mechanical strength than most SMD connections. In contrast, the bonding strength of PCB surface mount components does not surpass that of the multilayer PCB board surface. Process fixing components for through hole PCBA technology is best suited for high-reliability devices that require strong connections between different conductive layers of PCB in PCBA. The Surface Mount Device (SMD) is merely soldered to the circuit board’s surface through SMT assembly techniques, while the lead of the through hole fastening DIP component goes through the whole circuit board, allowing the part to endure greater environmental stress. If too much solder is used, it may go into other connections and produce a short circuit. If too little solder is used, then the joint may not be strong enough. Cold solder junctions can shatter, and getting the connection too hot might harm the components or the board.
As a result, the through hole PCBA assembly technique is typically employed for military, automotive, and aerospace goods with high acceleration, collisions, or temperatures. Through hole assembly technique is also appropriate for testing and prototyping applications that need manual device adjustment and replacement.
Characteristics of THT Technology
When using through hole assembly, one begins with a PCB and the PCB components. Then holes are drilled into the board that is just the right size to accommodate component leads. After the leads are inserted into the holes, they are soldered to the board, which secures them in place and forms a strong, long-lasting link. This is the distinguishing feature of through-hole assembly that makes it so dependable and allows it to continue servicing numerous sectors.
Through hole technology allows multiple components to be mounted on the PCBA,, and engineers employ two types of components throughout this procedure. These are some examples:
Axial leaded components
The most striking feature of an axially leaded component is its symmetrical form. This sort of DIP PCB component frequently has a cylinder-like form, with one or more leads extending from both ends. When each wire end is inserted through a hole, the axial component is low on the circuit board and might occupy a larger or smaller area depending on how the leads are positioned. These components may include resistors, inductors, and capacitors.
Radial leaded component
Radial leaded components are often cylindrical or rectangular box-shaped figures that incorporate various capacitors, resistors, and inductors. The fundamental distinction between these components and axial leaded components is that the former have leads that originate from one side rather than both ends. Attaching these parts to your PCB board takes significantly less space than utilizing axial leads, but also provides less placement freedom.
Advantages of Through Hole Technology
Strength of Bonds
Through hole assembly includes inserting necessary components through a circuit board and then connecting them with a metal solder, which strengthens the connection between the circuit and its components. When using electrical equipment, it is critical that all of the circuit’s components stay intact. Because of this, through hole assembly is a better choice for high-risk electrical equipment than alternative methods such as surface mount soldering.
Stronger linkages between circuit components imply greater durability and the ability to withstand tougher circumstances without significant wear and tear or damage. If there is need of an assembly that is suitable for aerospace industries or the usage of heavy machinery, through hole assembly technology is the best option and will last longer than others. A long-lasting electrical circuit will save money on replacement costs in the long run.
The last thing is to utilize time wondering about whether PCBA will hold up every time employed to machine. Because of the reliability of drilling and soldering technologies, using through hole PCBA assembly solutions eliminates this uncertainty. A reliable product may relieve your worries and help you maintain a high level of efficiency in your operations, which is essential in a tough or fast-paced environment.
PCBA Through-Hole Soldering Machine
Nowadays, there are a number of through-hole soldering machines available and all of them have different salient features. Sometimes, these machines are also known as Soldering Robots. The main usage of these robots is soldering the electronic through hole components to PCB. Mostly Soldering machines work on following two principles:
Wave Soldering: Wave soldering, as the name indicates, is used to join PCBs and parts using a liquid “wave” created by motor motion. Tin has been melted in the liquid. It is done in a wave soldering machine.
Selective Soldering: Selective Soldering is the use of a solder fountain to solder specific through hole DIP components on a PCB. A flux spray, preheater, and a soldering pot that feeds a solder fountain are all part of the machine. The solder fountain or head moves to the soldering position from beneath.
Let’s have a quick overview of both techniques in the following caparison table:
Following are some noticeable features of Selective soldering robots as follows
- Some robots have a very advanced design, and solid structure and are beautiful physically while remaining practical and more reasonable.
- Among all available robots, 5D and 6D are mostly used with X, Y1, Y2, Z, R, and feeding systems for soldering wire. All five or six-axis motions are controlled actions and can be performed by stepper motors to make 6D motion more precise and smooth.
- In robots, there is a mechanism of self-cleaning soldering tip, which enhance the quality of soldering.
- Mostly all robots have a 400W of heating recovery system, which helps in quick temperature of the robot’s tip.
- Such robots provides user vast variety of soldering tips to fulfill different requirements.
- When feeding solder wire, a break tin solder wire feeding system may punch holes and decrease burst tin, which causes the flux to remain on the PCB when soldering at high temperatures, hence improving soldering quality.
- These robots have a tip cleaning system, using a high-efficiency electric steel brush to clean the soldering tip. It effectively removes leftover tin from the soldering point.
This is the end of the introduction of through-hole technology. If you have different opinions or find wrong content on the website, you can contact us by email. FS Technology not only provides high-quality PCBA services, but also is committed to spreading more technology-related content.