Printed Circuit Board (PCB), is the integral part of all electronic devices. This PCB has electronics components soldered upon it. These electronic components can be SMT and THT. SMT means Surface Mount Technology and THT means Through Hole Technology. The process of soldering components on PCB is known as “Assembly” in simplest terms. Thus a PCBA is the combination of PCB and components together.
Assembly Types of PCBA
There are numerous ways one can assemble electronic components on PCB. The major types of PCB assembly are mentioned in the table given below:
| Assembly Type | Diagram | PCB Design Feature |
| Single-Sided SMD |  |
The SMD component is soldered on only single side of PCB |
| Double Sided SMD |  |
SMD is assembled on upper and lower both sides of PCB |
| Single Sided Mix Assembly |  |
Both THT and SMD are assembled on single side |
| Mix Assembly on top and only SMD on bottom |  |
Both THT and SMD are assembled on top side while only SMD on bottom |
| THT on top and SMD on bottom |  |
THT on one side while SMD on other |
Examples of PCB Types:
There are many applications where only SMD electronic components are assembled on single of PCB like DC-DC converter circuits, we can easily found them in electronic hardware stores.
1- These are the small modular circuits with SMD switching components like inductors, switching regulator ICs and SMD resistors and capacitors.
2- The double sided prototype PCB assembly containing only SMD are for example cell phone circuits, RAM for laptops and PC, wearable electronics, smart watches etc.
3- The single sided assembly having mix components THT and SMD examples are telecommunication circuits and graphic cards.
4- The double sided pcb assembly china having THT and SMD on both sides examples are mother board, switching Power supply circuits, Computer Power Supply.
5- PCB having THT on single sided while SMD on other sided examples are LED lights electronic circuits, energy saver circuits
