The base material selection for High Speed PCB

One of our customers from Europe, they always design and purchase PCB from RCY PCB company. Last week I received an email from this customer, their engineer planed to design a High-speed project, but they don’t know how to choose the base material. This also no wonder, because they focus on some normal projects in the last several years, the High-speed design is a new thing for them.

This is a typical question that worth sharing with more people, maybe someone is in need. We usually select the high-speed material to depend on the Df value: The material Df 0.01 to 0.005 is suitable for 10GB/s digital circuits; The material Df 0.005 to 0.003 is suitable for 25GB/s digital circuits; The material Df under 0.0015 is suitable for 50GB/s or above digital circuits.

 

One of our customers from Europe, they always design and purchase PCB from RcyPCB company. Last week I received an email from this customer, their engineer planed to design a High-speed project, but they don’t know how to choose the base material. This also no wonder, because they focus on some normal projects in the last several years, the High-speed design is a new thing for them. I think this is a typical question that worth sharing with more people, maybe someone is in need.

We usually select the high-speed material to depend on the Df value:

The material Df 0.01 to 0.005 is suitable for 10GB/s digital circuits;
The material Df 0.005 to 0.003 is suitable for 25GB/s digital circuits;
The material Df under 0.0015 is suitable for 50GB/s or above digital circuits.

The common high-speed materials as below:

  1. Rogers: RO4003,RO3003,RO4350,RO5880…
  2. TUC: TU862,872SLK,883,933 …
  3. Panasonic: Megtron4,Megtron6,Megtron7…
  4. Isola: FR408HR,IS620,IS680 …
  5. Nelco: N4000-13,N4000-13EPSI …
  6. Nanya: NPG-170D, NPG-171 …
  7. ITEQ: IT-200LK,IT-150DA …
  8. Shengyi, Taizhou Wangling…

For example, transmitting 25GB/s, its fundamental frequency is 12.5GHz, the third resonance frequency is 37.5GHz, the fifth resonance frequency is 62.5GHz, so the high-speed transmission has achieved microwave grade.

The base material will be very important as the frequency≥10GHz, especially for the high density rigid and flex-rigid PCB. When it reaches radiofrequency or microwave, we could choose Rogers, Arlon, Taconic series material. But for the high-speed transmission is not necessary to use the H-F material(such as Rogers), as long as the material meets the value of Dk and Df.

RcyPCB is a trusted and responsible PCB manufacturer in China, we are willing to support and grew up together with our customers.