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4 Layer Flex Board with Blind Vias

2024-04-08

4 Layer Flex Board with Blind Vias

Layers: 4

Surface treatment: immersion gold

Special process:vias in pad, blind vias

Material: PI Stiffener

Trace space:25um

Board thickness: 0.25mm

PI Stiffener total thickness: 0.25+/-0.1mm

Project challenge

1. The diameter of the PAD is too small, requiring 170um, but our engineers recommend making it more than 300um.

2. According to the customer's original Gerber production, the holes at BGA positions L1-L3 cannot be filled completely.

2. The client has a limited budget. Because it is a student project, the budget is limited. However, in order to support students, we apply for discounts from the leaders to support the client's project.

 How to Serve

(1)Due to the very high difficulty of this board, the original minimum spacing reached 25um. No room for optimization. The final product is controlled according to negative tolerance, and the line width is 50um±20um. Square welding 0.17MM±0.05mm control.

(2) Our engineers optimized the structure, changed the holes of L1-L3 into stacked holes of L1-L2 and L2-L4, and moved the lines on the L4 layer and added blocking points.

(3)Our engineers combined the customer's board structure with an optimized stacked structure.

 Results and Benefits

Ÿ Completed the customer's production on schedule, making her research project a complete success.

Ÿ The customer was very satisfied with the quality of our production and introduced other students from her school to us for production.

Ÿ Stable quality and experienced engineers save customers more time and money during project release. Let us gain more customers who trust us.

 

Our factory has manufactured flexible pcb over 18 years, all types fpcs can be manufactured. Please chat with me your flex boards at Cathy@beton-tech.com.

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