Ask a Question
Welcome to PCB Q2A. This is a Q&A community for PCB Q2A enthusiasts, providing professional Q&A on PCB assembly, PCB design, PCB testing, etc.


+1 vote
17 views

Why is the media thickness of HDI PCB less than 50um?

by (32.4k points)

2 Answers

+1 vote
 
Best answer

The media thickness of HDI PCB is less than 50um mainly because its media thickness will affect the signal quality and performance of the circuit board.

In high-speed circuits, the characteristic impedance of signal transmission changes with the dielectric thickness of the transmission line. If the medium thickness is too large, it will lead to unstable signal transmission and increased signal loss. Therefore, in order to ensure the stability and integrity of signal transmission, the media thickness needs to be controlled at a low level.

In addition, micropore technology is required in the production process of HDI PCB, and the diameter and depth of micropores are limited by the thickness of the medium. If the thickness of the medium is too large, the processing difficulty of micropores will increase, and it will also affect the mechanical properties and reliability of the circuit board.

Therefore, reducing the thickness of the medium to less than 50um can make HDI PCB have higher performance and reliability, while also helping to improve the manufacturing yield of the circuit board and reduce costs.

by (26.3k points)
selected by
0 votes

Ultra HDI PCB is defined as a product with conductor width, insulation spacing and dielectric thickness less than 50um, micropore diameter less than 75um, and characteristics exceeding the current IPC 2666 Class C standard.

by (26.6k points)

Related questions

+1 vote
2 answers 25 views
25 views asked Nov 4, 2023 by PCB European (26.3k points)
+1 vote
1 answer 30 views
30 views asked Oct 12, 2023 by anonymous
+1 vote
2 answers 26 views
26 views asked Oct 12, 2023 by anonymous
+1 vote
1 answer 24 views
+1 vote
2 answers 31 views
+1 vote
2 answers 37 views
+2 votes
4 answers 34 views
34 views asked Oct 11, 2023 by PCBManufactures (12.1k points)
+1 vote
2 answers 30 views
30 views asked Oct 11, 2023 by PCBManufactures (12.1k points)
+1 vote
2 answers 29 views
+1 vote
1 answer 33 views
+1 vote
1 answer 26 views
+2 votes
1 answer 27 views
+1 vote
1 answer 25 views
+1 vote
1 answer 27 views
+1 vote
1 answer 29 views
29 views asked Nov 10, 2023 by PCB European (26.3k points)
+1 vote
2 answers 24 views
24 views asked Nov 9, 2023 by PCBManufactures (12.1k points)
+1 vote
1 answer 21 views
+1 vote
2 answers 25 views
+1 vote
1 answer 28 views
28 views asked Nov 13, 2023 by PCB Design Company (26.6k points)
+1 vote
2 answers 35 views
35 views asked Oct 11, 2023 by PCBManufactures (12.1k points)
+1 vote
1 answer 22 views
+1 vote
1 answer 29 views
+1 vote
1 answer 35 views
...