PCB Technical - The similarities and differences between PCB and PCBA

I believe that many people are not unfamiliar with PCB circuit boards, and may be heard often in daily life, but they may not know much about PCBA, and may even be confused with PCB. So what is a PCB? How did PCBA evolve?

About 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 "printed" 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 extremely widely used in the manufacture of electronic products. The unique characteristics of PCB are summarized as follows:

1. The wiring density is high, the volume is small, and the weight is light, which is conducive to the miniaturization of electronic equipment.

2. Due to the repeatability and consistency of the graphics, it reduces wiring and assembly errors and saves equipment maintenance, debugging and inspection time.

3. It is conducive to mechanization and automated production, which improves labor productivity and reduces the cost of electronic equipment.

4. The design can be standardized to facilitate interchangeability.

Note: SMT and DIP are both ways to integrate parts on the PCB. The main difference is that SMT does not need to drill holes on the PCB. In DIP, the PIN pins of the parts need to be inserted into the holes that have been drilled.

SMT (Surface Mounted Technology) surface mount technology mainly uses mounters to mount some tiny parts on the PCB. The production process is: PCB board positioning, solder paste printing, mounter mounting, and reflow Furnace and finished inspection.

DIP stands for "plug-in", that is, inserting parts on the PCB board. This is the integration of parts in the form of plug-ins when some parts are larger in size and are not suitable for placement technology. The main production process is: sticking adhesive, plug-in, inspection, wave soldering, printing and finished inspection.

The difference between PCB and PCBA

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

How to ensure the quality of PCBA design and processing?

At PCBA seminars, focusing on quality has become a habit. So how to ensure the quality of PCBA design and processing? Why can it be ensured that the pass rate of the product reaches more than 98%? The following is an introduction by the electronic technicians of PCBA manufacturing Komoron on how to ensure the quality of PCBA processing?

1. Make sure to purchase and accept raw materials.

Abundant supplier resources and cheaper bulk purchase prices. Through long-term cooperation with suppliers, a large number of products can be purchased and costs can be reduced.

2. Ensure effective process production quality and implementation process.

Excellent engineering skills: senior front-end engineers and test engineers to assist customers in analysis; PCB design and proofing, according to the test plan can effectively analyze the causality of reasonable orders for all products.

3. Focus on product quality inspection.

With advanced production equipment and testing equipment, BGA sticker fan 0. 18 mh-0.4. The smallest packaging material is 01005, MYDATA Sweden automatic MT production line, 3 million production points per day and top quality control and testing equipment.

Strictly control the quality control level of high-quality PCB circuit board suppliers, set up QC in front of the furnace for bad screening, PCBA 100% visual inspection after the furnace, PCBA 100% optical inspection, sampling rate up to 60,13 temperature zone reflow soldering each The product sets the temperature independently.

4. Do a good job in quality prevention and improvement.

Main pass rate: greater than or equal to 9%; delivery completion rate: 100%; customer satisfaction, greater than or equal to 80%.

Always adhere to the high standards of the supplier team, components, production, quality inspection team and process requirements, there is no shortcut to quality. Pay attention to the quality of PCBA products, establish a complete product quality assurance system, have advanced technology, sophisticated equipment, sophisticated testing instruments, strict scientific management, trustworthy products, sold at home and abroad, depending on "products are quality". The quality concept and good time use are well received by users at home and abroad.