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1. Insert the installation technology (THT)
The components placed in the board side, and on the other side of the welding pin, a technique known as "plug-in (Through Hole Technology, THT)" installed.

This installation, components take up a lot of space, and you want to drill a hole in each pin, take their feet off the sides have the space, but also relatively large joints.

But on the other hand, THT components and SMT (Surface Mount Technology) components than up, structure and PCB connection is better, like a cable outlet, you need the ability pressure, so they are usually THT package.

2. Surface Mount Technology (SMT)
Using surface mount technology (SMT: Surface Mounted Technology) components, pins are welded together with the components side.

This installation technique that avoids the need for soldering THT each pin on the PCB drill holes have trouble. On the other hand, surface mount components, you can also be installed on both sides of the PCB, which greatly improves the utilization of PCB area.

THT SMT components are smaller than, and the use of PCB compared THT components, PCB board using SMT technology components to many intensive. In comparison, SMT package components to be cheaper than THT, so most are on today's PCB SMT.

Because the current PCB production process fully automated techniques are used, although the solder joints and components mounting pin SMT components is very small, but will not increase the production difficult, but, if the fault repair when there is need to replace the element device, then a higher welding technology requirements.