I-PEX 82877-100B-02-D CABLINE®-CX II 46AWG/50Ω series ultra-thin coaxial cable replacement

Extremely thin coaxial cables can be used for USB 3.1 Gen 2, engineers need to check the "validation level" first.

In high-speed electronic device design, whether a very thin coaxial cable can transmit USB 3.1 Gen 2 cannot be determined solely by whether the cable is a coaxial structure; it requires a comprehensive judgment based on the connector, wire diameter, impedance, length, wiring method, and overall signal integrity. Taking the I-PEX 82877-100B-02-D corresponding to this article as an example, the product belongs to the CABLINE®-CX II With Cover 40Pin very thin coaxial cable assembly, using AWG46 Micro-Coax, 100mm in length, and 1-N wire definition. The connector model used at the wire end is 20974-040T-01. The配套 connectingor adopts a 0.25mm Pitch and horizontal insertion-extraction structure, with an interlock height of 0.83±0.17mm, maximum of about 1.00mm, suitable for internal connections of high-speed devices with limited space. The transmission speed reference value provided by I-PEX is 5 Gbps/lane NRZ, and it explicitly lists **USB 3.1 Gen 1 (5 Gbps/lane)** as an Applicable Standards reference standard.

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USB 3.1 Gen 2 is 10Gbps, it cannot be claimed to support just because of "extremely thin coaxial"

For procurement and R&D personnel, there is an easily confused concept here: although both USB 3.1 Gen 1 and USB 3.1 Gen 2 can adopt high-speed differential signals, the former usually corresponds to a 5Gbps level, while the latter reaches a 10Gbps level. I-PEX currently lists the reference application standards for CABLINE®-CX II With Cover on its official page as USB 3.1 Gen 1, V-by-One HS 1.4, HDMI 1.3, eDP, and MIPI, among which USB 3.1 Gen 2 is not listed as an official Applicable Standard, and the transmission speed given on the product page is also "5 Gbps/lane Reference Only". Therefore, for 82877-100B-02-D, a more rigorous engineering statement should be: the official documentation supports reference applications at the 5Gbps/lane level, and it is not advisable to directly promote the standardized cable as an officially verified USB 3.1 Gen 2 (10Gbps) cable. If the customer project indeed requires USB 3.1 Gen 2, further verification should be carried out for actual cable length, ultra-fine coaxial cable structure, impedance, connector combination, PCB routing, and system SI testing.

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Why is 82877-100B-02-D still suitable for high-speed, miniaturized devices

From the perspective of engineering design, the advantage of 82877-100B-02-D is not just "how fast it can transmit," but rather the combination of miniaturization, high density, flexible wiring, and EMI control. CABLINE®-CX II With Cover uses a 0.25mm contact spacing, 40 Signal Pins, and is equipped with mechanical latches and shielded housing structures; the official materials also show the grounding path from the wire end shielding, grounding rod, male connector housing, shielded housing housing, to the female connector housing and PCB, which is beneficial for EMI control in high-speed signal applications. For notebook computers, display modules, industrial vision equipment, and internal high-speed connection scenarios with limited space, engineers should pay attention to both "whether the cable can meet the protocol rate" and "whether the entire interconnection structure can maintain signal integrity" when selecting, rather than just comparing the AWG wire diameter.

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Selection and compatibility as well as alternative solution references and suggestions

If the original design of the customer uses I-PEX 82877-100B-02-D, it is recommended to use the complete specifications as the matching basis when procuring substitutes, rather than only purchasing based on "40Pin ultra-fine coaxial cable". Pay special attention to the 40Pin, 0.25mm Pitch, AWG46, 100mm, 1-N wire position definition, and the wire material connector 20974-040T-01, while also confirming the actual equipment's requirements for impedance, EMI, bend radius, installation space, and high-speed signal performance. The I-PEX official also lists 82877-100B-02-D as an evaluation cable model with 40Pin, 46AWG, 100mm, 1-N. Our company can provide I-PEX 82877-100B-02-D compatible substitute cable solutions and can produce ultra-fine coaxial cable bundles according to the customer's actual length, wire position definition, and connector matching requirements, providing substitute options for R&D verification, sample testing, and bulk purchasing. For USB 3.1 Gen 2 projects, it is recommended to perform SI testing at the sample stage and use the actual test results as the final selection basis.

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The key to determining whether a very fine coaxial cable can transmit 10Gbps is "system verification."
The ultra-thin coaxial cable itself does not have a simple "supports/does not support USB 3.1 Gen 2" answer. What truly determines the 10Gbps transmission capability is the comprehensive performance of the cable, connector, impedance control, length, PCB, and the entire high-speed link. For the I-PEX 82877-100B-02-D, the official documentation currently provides a reference transmission capability of 5 Gbps/lane, corresponding to reference applications such as USB 3.1 Gen 1. Therefore, engineers and procurement personnel should not define it as a USB 3.1 Gen 2 cable without SI verification. I am【3W Electronic Components Network】We provide mature alternative solutions and engineering, product support for high-speed ultra-fine coaxial cable assemblies and connectors to professional customers. If you have any needs, please contact:Manager Zhang 18913228573 (WeChat same number)For projects requiring replacement of the original I-PEX cables, a one-to-one match should be made based on specific part numbers, connectors, wire positions, and sizes, followed by actual high-speed signal testing to confirm performance.