High-speed core for thin and light devices - I-PEX connector application guide for high-frequency cable束

In smartphones, laptops, display modules, and other consumer electronics, ultra-fine coaxial cables (micro coaxial cable) paired with I-PEX connectors have become the mainstream solution for high-frequency signal transmission. The following lists several aspects that engineers need to focus on from a design perspective when applying them.

Connector selection: Matching wire diameter and spacing is crucial
In high-speed signal links, the contact spacing (Pitch) of the connectors must match the outer diameter of the cables accurately.
I-PEX common models such as CABLINE®-VS (0.5 mm pitch) and CABLINE®-CA (0.4 mm pitch) require the cable outer diameter to be no more than about 0.5 mm and 0.4 mm respectively.
A larger wire diameter can reduce transmission loss, but it will also increase the thickness of the cable bundle, posing higher requirements for the internal space of the device. Therefore, a balance needs to be achieved between electrical performance and structural space.

Impedance consistency: control signal reflection and loss
In high-speed system design, impedance matching is the key to signal integrity.
Most high-speed protocols (such as USB4) may use 42.5 Ω, while traditional standards are mostly 50 Ω.
Therefore, the cables, connectors, and PCB routing must maintain impedance continuity to effectively reduce reflections, lower insertion loss, and ensure the stability of signal transmission.

High-speed performance: supports the new generation interface standard
I-PEX's CABLINE® series meets the needs of ultra-high-speed transmission, compatible with various protocols such as USB4, Thunderbolt™ 3, eDP, PCIe, etc.
Some models support frequencies up to 16 GHz or data rates of 64 Gbps (PAM4), with channel rates reaching 32-40 Gbps/lane, providing ample margin for future higher bandwidth interfaces.

Four, EMC protection and structural stability
I-PEX's ZenShield® full-shielding structure provides 360° EMI protection, with multi-point grounding effectively reducing electromagnetic interference.
In addition, some models are equipped with a mechanical latch cover to prevent stress-induced loosening or accidental removal during vibration or in narrow spaces, thereby improving the reliability of the connection.

Five, structural form and spatial adaptation
I-PEX offers various interface types for different device layouts:
Horizontal connection (CABLINE®-VS / CA / CBL) and vertical right-angled connection (CABLINE®-UM / UY / UA II) and the like.
The overall height is controlled between 0.8-1.2 mm, and some models like CABLINE-UY have a height of only 0.82 mm, which is extremely suitable for thin and light devices with folding or hinge structures.

Six, Assembly and Production Efficiency
I-PEX innovative i-Fit® welding-free crimping technology significantly shortens assembly time, and in combination with automated processes, achieves high consistency production.
This not only improves manufacturing efficiency but also reduces the rate of manual errors, making large-scale harness production more reliable and stable.

In the design of extremely fine coaxial cable assemblies, engineers need to conduct an overall evaluation from multiple aspects, including the matching of spacing and wire diameter, impedance consistency, high-speed performance, EMC protection, spatial layout, and assembly technology.
Reasonable system design can improve the reliability and design freedom of the whole machine while ensuring signal integrity.
I am[Suzhou Hui Cheng Yuan Electronics], Focuses on the research and development and customization of high-speed signal cable assemblies and ultra-fine coaxial cable assemblies, providing customers with high-stability high-speed interconnection solutions. If you have relevant technical needs, please contact:Manager Zhang 18913228573 (WeChat same number)We will provide you with professional support and technical services.