What are the requirements of SMT processing on PCB board

SMT processing usually has many requirements for PCB board, and the boards that must meet the requirements can accept SMT processing. So, why does the SMT welding process require so many requirements on the circuit board? Next SMT manufacturers for you to introduce in detail.

It has been proved that in the process, there will be a lot of special processes, and the application of special processes will then bring SMT processing about the requirements for PCB board, if there are problems with PCB boards, it will increase the difficulty of PCBA welding process, and eventually may lead to welding defects, unqualified boards and other situations. Therefore, in order to ensure the smooth completion of the special process and facilitate SMT processing, the PCB board must meet the manufacturability requirements in terms of size and pad distance.

SMT processing requirements for PCB board have the following points:

1、PCB sizeThe width of the PCB (including the edge of the board) must be greater than 50mm and less than 460mm, and the length of the PCB (including the edge of the board) must be greater than 50mm. 

2、PCB edge widthPCBA board  width ： 5mm, board spacing : 8mm, distance between pad and edge : 5mm. 

3、PCB bending degreeUpward curvature: 1.2mm, downward curvature: 0.5mm, PCB deformation: maximum deformation height ÷ diagonal length 0.25. 

4、PCB board Mark point Mark shape: Standard circle, square, triangleMark size: 0.8~1.5mmMark material: Gold, tin, copper and platinum Mark surface requirements: The surface is flat, smooth, no oxidation, no dirt around the Mark requirements: there must be no obstacles such as green oil significantly different from the color of the Mark within 1mm around the mark position: more than 3mm from the edge of the board, no holes, test points and other marks within 5mm.

5、PCB pad patch components welding pad no through holes. If there is a through-hole, the solder paste will flow into the hole, resulting in less tin in the device, or the tin flow to the other side, resulting in uneven surface, unable to print the solder paste. When conducting PCB design and production, it is necessary to understand some PCB welding process knowledge in order to make the product suitable for production. Understanding the requirements of the processing plant first can make the subsequent manufacturing process smoother and avoid unnecessary trouble.

This is the SMT processing of PCB board requirements, in the production of PCB board is not slack, the production of high-quality compliance of the PCB board in order to let the board better accept other special processes, and give PCB board life, and inject the soul of the function. 

1. Maximum board: 310mm*410mm(SMT); 

2. Maximum plate thickness: 3mm; 

3. Minimum plate thickness: 0.5mm;

4. Minimum Chip parts: 0201 package 0.6mm*0.3mm or more parts; 

5. Maximum mounting parts weight: 150g;

6. Maximum part height: 25mm; 

7. Maximum part size: 150mm*150mm; 

8. Minimum pin part spacing: 0.3mm; 

9. Minimum ball parts (BGA) spacing: 0.3mm; 

10. Minimum ball parts (BGA) ball diameter: 0.3mm; 

11. Maximum parts mounting accuracy (100QFP) : 25um@IPC; 

12. Patch capacity: 3-4 million points/day. 

Strength guarantee 

SMT workshop: with imported SMT machines, optical inspection equipment, can produce 4 million points per day. Each process is equipped with QC personnel, who can keep an eye on product quality.

DIP production line: 

1. there are two wave soldering, of which there are more than 10 old employees who have worked for more than three years. The workers have high proficiency and can weld all kinds of plug-in materials. 

2. Quality assurance, cost-effective 

▪ High-end equipment can be attached to precision special-shaped parts, BGA, QFN, 0201 materials. Also can be template patch, loose material hand. 

▪ Sample and size batch can be produced, proofing from 800 yuan, batch 0.008 yuan/point, no start-up fee. 

3. Rich experience in SMT and welding of electronic products, stable delivery 

▪ Accumulated services for thousands of electronic enterprises, involving many types of automotive equipment and industrial control motherboard SMT processing services, products are often exported to Europe and the United States, quality can be affirmed by new and old customers. 

SMT processing，Punctual delivery, normal 3-5 days after complete materials, small batches can also be expedited on the same day.

4. Strong maintenance ability, perfect after-sales service

Experienced maintenance engineers can repair all kinds of patch welding caused by bad products, to ensure the connectivity of each PCB board.

24-hour customer service staff responds at any time to solve your order problems as quickly as possible.