Categorization：Harness Component
Inside laptops, high-resolution display devices, industrial equipment, and other high-speed electronic devices, engineers often face the design challenges of "increasing signal rates, decreasing internal space, and stricter EMI control requirements." The I-PEX CABLINE®-VS II series is a 0.5mm Pitch horizontal insertion ultra-fine coaxial connection solution specifically designed for such applications. Among them, the I-PEX 82661-100B-02-D, which is introduced in this issue, belongs to the 40Pin Micro-Coaxial ultra-fine coaxial cable assembly. The standard specifications are 40AWG, 300mm, 1-N pin definition, using the CABLINE-VS II series connection structure, and the connector model used with the cable end is 20847-040T-01. With its 0.5mm ultra-fine pitch, approximately 0.95±0.25mm mating height, and high-density 40Pin structure, it is particularly suitable for devices that have high requirements for connector footprint, cable assembly space, and high-speed signal transmission. For engineers, the value of such cable assemblies is not only in "connecting 40 signal paths" but also in achieving stable high-speed signal interconnection within limited space through ultra-fine coaxial structures, precise termination, and high-density connector design. For purchasers, it is necessary to pay close attention to the pin count, wire diameter, length, pin definition, connector model, and overall termination process to ensure they match the original design. Relevant connector data sheets show that the CABLINE-VS II uses a 0.5mm pitch, horizontal insertion, mechanical lock, and ZenShield® full shielding design, and is suitable for high-speed applications such as PCIe Gen5, USB4, and DisplayPort.
The core working principle of extremely fine coaxial cable束 can be understood as utilizing the coaxial structure to "confine, transmit, and shield" high-speed electrical signals: the central conductor is responsible for transmitting the electrical signal, the surrounding insulating medium maintains the electrical spacing between conductors, and the outer shielding structure is responsible for electromagnetic shielding and reference circuit related functions; when high-speed signals enter the cable, the signals propagate along the relatively stable transmission structure towards the connector end, rather than simply focusing on "conduction" as in ordinary low-speed wires. Therefore, in high-speed applications, engineers need to consider not only whether the cable can conduct, but also to comprehensively consider factors such as characteristic impedance, insertion loss, return loss, crosstalk, signal delay, and shielding performance. The official documentation of CABLINE-VS II uses a 40Pin connector, AWG40 Micro-Coaxial Cable, 45Ω impedance, 100mm cable length, and GSSGSSG pin arrangement for the high-speed evaluation conditions, and provides reference transmission performance up to PCIe Gen5's highest 32 GT/s/lane NRZ; at the same time, this series adopts ZenShield® full shielding structure and multi-point grounding design to improve the EMI/EMC performance under high-speed transmission conditions. From this perspective, extremely fine coaxial cable束 is not just a simple "ultra-thin wire", but a precision interconnection component that combines conductors, insulation, shielding, impedance control, precise termination, and high-speed connectors.
For compatibility development or alternative procurement of I-PEX 82661-100B-02-D, engineers are advised to first confirm the original device's interface structure and electrical requirements, and then check each item of the cable model and critical dimensions. This model corresponds to a 40Pin Micro-Coaxial 40AWG, 300mm, 1-N structure, therefore, it cannot be replaced solely based on "40Pin ultra-thin coaxial cable." Instead, it is necessary to confirm the wire length, wire position definition, connector structure, Pin Assignment, wire exit direction, and internal routing space of the device. Among them, 20847-040T-01 is the model of the 40Pin CABLINE-VS II Plug Housing (plastic connector body) used at the end of this product line. When purchasing, it is particularly important to confirm the matching relationship between the connector body, lock, and shielding components. I-PEX official data shows that CABLINE-VS II supports 20/30/40Pin configurations and supports AWG36～AWG44 Micro-Coaxial Cable; the width of the 40Pin structure can be understood as "6.85 + 0.5×Pin quantity," with a mating height of about 0.95±0.25mm and a working temperature range of -40℃～+105℃. For purchasers, it is recommended to directly provide key conditions such as "I-PEX 82661-100B-02-D, 40Pin, 40AWG, 300mm, 1-N, connector 20847-040T-01" when inquiring to reduce supplier misunderstandings; for engineers, if the product involves PCIe, USB4, eDP, DisplayPort, and other high-speed signals, further impedance, SI, and EMI/EMC verification should be conducted, rather than just mechanical size and conduction tests.
If the original equipment is using I-PEX 82661-100B-02-D, it is recommended to adopt the "mechanical compatibility + electrical compatibility + harness process compatibility" approach for alternative evaluation during localization, supply chain optimization, second supplier introduction, or cost control. Firstly, the mechanical end should confirm the 40Pin, 0.5mm pitch, horizontal insertion structure, connector size, insertion height, and wire exit direction; secondly, the harness end should confirm the 40AWG Micro-Coaxial Cable, 300mm length, and 1-N wire position definition, and focus on checking the pin correspondence of each wire; finally, for high-speed signal applications, impedance, insertion loss, return loss, crosstalk, and shielding performance should be verified according to the actual system requirements. I-PEX data shows that in the CABLINE-VS II 40Pin Micro-Coaxial 40AWG 1-N sample harness, 100mm, 200mm, and 300mm correspond to the 82660, 81458, and 82661 series respectively. Therefore, when selecting an alternative solution, different lengths or 1-1 structure models should not be directly considered as completely equivalent products. Our company can provide: I-PEX 82661-100B-02-D compatible alternative harness solutions, which can be customized for development and production of extremely thin coaxial harnesses according to customer equipment connector configurations, 40Pin/40AWG/300mm specifications, and 1-N wire position definition, and can further match wire materials, termination methods, length, wire exit forms, and high-speed signal transmission requirements according to specific project requirements. For customers with domestic substitution, second supplier verification, or bulk purchasing needs, it is recommended to provide original harness or complete interface specifications at the sample stage to facilitate targeted verification of size, pin position, wire sequence, and electrical performance.
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