1, functional differences
The function of PCB is to make a program (including data) that cannot run independently in a multi-program environment become a basic unit that can run independently and a process that can be executed concurrently with other processes; It is a program code segment that can be executed by the process scheduler on the CPU.
Excellent circuit design in PCBA board can save production cost and achieve good circuit performance and heat dissipation performance.
2. Essential differences
PCB is the only symbol of the existence of a process, and the PCB process control block is the static description of the process. PCB is the support of electronic components and the provider of circuit connection of electronic components.
The essence of PCBA board belongs to the production process. PCB blank goes through the whole process of SMT loading or DIP plug-in.
As can be seen from the above introduction, PCBA generally refers to a processing flow, which can also be understood as a finished circuit board, that is, PCBA can only be counted after all the processes on the PCB are completed. PCB refers to a blank printed circuit board without any parts on it.
So, in general, PCBA is a finished board; PCB is bare board.
Extended data:
Main applications of PCB:
1, smartphone
In order to fit all the chips on the front and back of iPhone4 on a very small PCB area, AnyLayerHDI board can avoid the waste of space caused by drilling holes in the machine ring and achieve the purpose of conducting any layer.
2. Computer
Gartner analysts pointed out that notebook computers have been the growth engine of the personal computer market in the past five years, with an average annual growth rate of nearly 40%. It is expected that AnyLayerHDI will be used in more and more high-end mobile phones and tablets in the future.
3. E-books
The design trend of PCB board for e-books: first, it is required to increase the number of layers; Second, blind hole burying technology is needed; Thirdly, a PCB substrate suitable for high frequency signals is needed.
Baidu encyclopedia -PCB
Baidu encyclopedia -PCBA