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data-rate-fpc-ffc for definition of supported data rate of FPC / FFC Connectors​

Regarding definition of supported data rate of FPC / FFC Connectors​

Measurement using the reference FFC (length 100/200/300mm) defines the following two points

Definition ①:

  • Determined from the S parameter at differential 100Ω, the lowest value among the following is the (recommended) transmission speed/Data Rate

  • Insertion loss = Sdd21 has sufficient linearity up to the Nyquist frequency​
  • Return loss = Sdd11/Sdd22
    1. Do not exceed -15dB up to the Nyquist frequency
    2. Do not exceed -10 dB up to 1.5 times the Nyquist frequency

Definition ②:

Satisfy the requirements by evaluating specific standards (However, Sdd21 is assumed to have sufficient linearity up to 1.5 times Nyquist)

Unless otherwise specified, the acquisition of S-parameters shall be obtained with those recommended in the product drawing, and shall include the mounting part (ex. pads on the substrate side for SMT, etc.)
(Additional to definition 2) If compatibility with or compliance with an interface standard, etc., is indicated, the requirements of that standard are met.

* Products without a GND must be grounded on the FPC/FFC side.

When defining the supported data rate of the FPC / FFC Connectors

In principle, it is consistent with the data rate definition of the Board to Board Connectors for the sake of consistency so as not to confuse customers. Please refer to "Definition of supported data rate for Board to Board Connectors" for our basic concept.

When defining the supported data rates for FPC / FFC Connectors, the following points were different from those for Board to Board Connectors, and it was necessary to deal with them.

  • Performance largely depends on the specifications of the FPC/FFC used
  • Performance depends on length
  • Occupying a higher proportion of the entire transmission path in many cases/close to Chip to Chip

Considering the above, we have removed the absolute value standard from Sdd21 and provided definition 2 as an example of matching various standards and compliance points (some Board to Board Connectors also have appropriate applied by adding trace minutes).

For examples of definition (2), please refer to "High-speed Transmission Solution" as well.

Supported data rate list for each product (recommended value)

Listed from those that have been evaluated/assessed (updated as necessary). In addition, it is implemented from the 0.5mm pitch connector.

Product Definition ① Definition ②
product type series Data rate Data rate Target standard
Flip type 2-point contact 12001S 1.0Gbps ― ―
12003S 1.0Gbps ― ―
slider cover 1-point contact 9631S 1.7Gbps ― ―
9632S 1.7Gbps ― ―
9685S 1.7Gbps ― ―
9686S 1.7Gbps ― ―
Flip type 1-point contact 9637S 1.7Gbps ― ―
9681S 5.0Gbps ― ―
Auto I-Lock structure 11501S 12.0Gbps 25.0Gbps CEI 28G-SR
11503S 12.0Gbps 25.0Gbps CEI 28G-SR
11600S 12.0Gbps 25.0Gbps CEI 28G-SR

Regarding use at a supported data rate (recommended value) or higher

As mentioned above, the transmission characteristics of FPC / FFC Connectors are highly dependent on the wire used, and the speed that can be supported also changes depending on the customer's actual equipment design. Our company's definition (2) refers to the standard, but our own definition (1) is a relatively strict assessment value. If you are considering using a higher data rate, please consult your sales representative or contact us via the web. Depending on the content, we may be able to propose additional evaluations and recommended FPC/FFC specifications that are closer to your company's consideration.

Below are reference waveforms for observing eye patterns up to 12Gbps (PBRS = 2^7-1, using a 300mm FFC). You can check the possibility of using each connector in areas that exceed the recommended data rate.

Reference waveform for eye pattern observation up to 12Gbps

When using a product without a GND

Impedance matching FPC/FFC has a shield layer. It is necessary to implement grounding processing on the FPC/FFC side, or use an FPC, etc. with the shield dropped on a specific pin.