IC and PCB connection
Integrated circuit (IC), how to install it to the PCB? According to different methods, it can be roughly classified into THT (through-hole technology), that is, through-hole insertion technology, and SMT (surface mounting technology), that is, surface mounting technology.
The THT method is: Insert the IC's pin into the mounting hole of the PCB, and then solder it. SMT does not need to insert the pin of IC into the hole of PCB, but weld directly on its surface, namely weld on the surface. Now that SMT is the mainstream, electronic products, especially consumer electronics, basically use SMT technology. So, what are the advantages of SMT? Kim Bazaar shares with you:
THT-type ICs have higher area and mass coefficients, while SMT types are significantly reduced, which can reduce the volume of electronic products by 60% and the quality by 75%, which can greatly increase the PCB assembly density. SMT components are small in size, light in weight, and strong in anti-vibration capability, so they are highly reliable, and their mounting is also more robust. No leads or short leads reduce the influence of parasitic inductance and parasitic capacitance, and improve the high-frequency characteristics of the circuit. Because it can be mounted on the surface, this operation is called convenient, easy to automate production, improve the efficiency of the entire process.
Since SMT has so many advantages, it has now become mainstream. So is THT outdated? Is it not used anymore? This is not the case. Many PCBs still use THT. Although SMT is convenient for automated production, its overall process is not as simple as THT, and the cost of THT basic materials is low and investment is relatively small. For products that are not demanding, and some SMT cannot be implemented, THT must be used, and more applicable product types.
In short, THT and SMT have their own advantages. In the current factory, ICs are connected to PCBs. These two processes are used together.