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What is the differrence between PCB and PCBA?

What is a PCB

 PCB is the abbreviation of Printed Circuit Board. Translated into Chinese is called printed circuit board. Because it is made by electronic printing, it is called "printing" circuit board. PCB is an important electronic component in the electronics industry, a support for electronic components, and a carrier for electrical connection of electronic components. PCB has been widely used in the manufacture of electronic products, and its unique features are summarized as follows:
1. High wiring density, small size and light weight, which is conducive to miniaturization of electronic equipment.
2, due to the repeatability and consistency of the graphics, reducing wiring and assembly errors, saving equipment maintenance, debugging and inspection time.
3. Conducive to mechanization and automated production, increasing labor productivity and reducing the cost of electronic equipment.
4, the design can be standardized, which is conducive to interchange.
  PCB as a bare board requires the product designer to provide PCB files for PCB factory manufacturing. The traditional circuit board uses the method of printing etch resist to make circuit lines and drawings, so it is called printed circuit board. Or printed circuit boards. Due to the ever-increasing miniaturization and refinement of electronic products, most of the current circuit boards use an etch resist (film or coating), and after exposure and development, the circuit board is etched.
  There are many types of PCB boards, which can be divided according to the number of layers, such as single layer board, double layer board, 4 layer board, 6 layer board and 8 layer board, etc.; according to different materials, it can be divided into aluminum substrate, Fr4 board, etc. 

What is PCBA

  PCBA is the abbreviation of Printed Circuit Board +Assembly. PCBA is a finished product formed by SMT patch, DIP plug-in and PCBA test, quality inspection assembly and other processes, which is referred to as PCBA. Almost all electronic products, such as smart home, AR, VR, medical equipment, etc., are controlled by components in the PCBA motherboard. In other words, PCBA is the "heart" of all electronic products.

  Note: Both SMT and DIP are ways to integrate parts on the PCB. The main difference is that SMT does not need to drill holes in the PCB. In DIP, the PIN pin of the part needs to be inserted into the drilled hole.
SMT (Surface Mounted Technology) surface mount technology mainly uses the placement machine to mount some micro-miniature parts onto the PCB. The production process is: PCB board positioning, printing solder paste, placement machine placement, over-reflow Furnace and finished inspection.
DIP is a "plug-in" that inserts parts on a PCB version. These are integrated parts in the form of plug-ins that are large in size and not suitable for placement technology. Its main production processes are: adhesive backing, inserts, inspection, wave soldering, brushing and inspection.

What is the difference between PCBA and PCB ?

  Difference 1: PCB refers to an empty printed circuit board with no components on it. Made of epoxy glass resin material, it is divided into 4, 6 and 8 layers according to the number of signal layers. 4 and 6 layers are the most common.
  Difference 2: PCBA refers to a processing flow, which can also be understood as a finished circuit board. PCBA is the electronic element required for soldering and assembly on a PCB board by SMT or plug-in processing after obtaining the PCB as a raw material. Devices, such as ICs, resistors, capacitors, crystals, transformers and other electronic components, are heated at high temperatures in a reflow oven to form a mechanical connection between the components and the PCB. That is, after the processes on the PCB are completed, the PCBA is formed.
  In general, the PCB is a circuit board without components, and the PCBA is a circuit board for soldering electronic components.
Can be intuitively understood through the following pictures.

  With the high-speed, high-performance and ultra-small size of electronic machines, packaging technology has been greatly developed. Chip-size packages CSP and BGA packages are moving toward multi-lead ends and narrow lead pitches, and bare-area (Bare Chip) packages have also been put to practical use. Due to advances in these packaging technologies, new requirements have also been placed on printed circuit board PCBs (adapting to high-density packaging and high-speed requirements).

  Former electronic product manufacturers, to complete a complete circuit board production, usually need to purchase the PCB back, then contact the patch manufacturer, processing, the process is very troublesome, and the cost is also quite a lot. Nowadays, many manufacturers are willing to choose PCB manufacturers to process patches at the same time as PCB production, or let patch manufacturers replace PCBs. These two methods save a lot of trouble and speed up production efficiency. And PCBA manufacturers can achieve these two fast and efficient processing methods.
  PCB procurement and SMT processing are two different production methods. Many electronic manufacturers only use one of them. This requires electronic product manufacturers to consider the strength of the manufacturer when selecting PCBA processing manufacturers. The manufacturer who completed the entire process.