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The difference between PCBA board and PCB board is as follows:
1. The difference in function
The role 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, a process that can be executed concurrently with other processes; it is a process that can be executed by the process scheduler in the process. The program code segment executed on the CPU. Excellent circuit design in PCBA board can save production cost and achieve good circuit performance and heat dissipation performance.

2. Essentially different
PCB is the only sign of the existence of a process, and the PCB process control block is a static description of the process. PCB is the support of electronic components and the provider of circuit connection of electronic components.
The PCBA board is essentially a production process, and the empty PCB board goes through the SMT assembly or the entire manufacturing process of the DIP plug-in.

From the above introduction, it can be seen that PCBA generally refers to a processing process, which can also be understood as a finished circuit board, which means that PCBA can only be counted after the processes on the PCB board are completed. The PCB refers to an empty printed circuit board with no parts on it.

So in general: PCBA is a finished board; PCB is a bare board.