Categorization：Harness Component
In notebook computers, high-speed display modules, industrial vision, AI terminals, and other high-density electronic devices, the internal connection space is becoming increasingly limited. At the same time, interfaces such as USB4, Thunderbolt, and high-speed display are constantly raising the requirements for signal integrity, making traditional ribbon cables difficult to balance space, transmission performance, and anti-interference capabilities. The I-PEX CABLINE®-UM series is a high-speed ultra-thin coaxial connection solution developed for such applications. Its connectors feature a 0.4mm contact spacing and a Vertical Right Angle vertical right-angle outlet structure, with a height of approximately 2.2±0.15mm, and support 30Pin, 40Pin, 50Pin, 60Pin, and other specifications. This article focuses on the I-PEX 81465-100B-02-D, which belongs to the CABLINE®-UM series 30Pin, 40AWG Micro-Coaxial Cable ultra-thin coaxial cable assembly. The standard sample length is 200mm, using the 1-N wire position definition, and the connector model used at the cable end is 20878-030T-01. For engineers, such cable assemblies can complete multi-channel high-speed signal transmission within limited space; for purchasers, clearly defining material numbers, connectors, wire position definitions, and length specifications is an important foundation for compatibility replacement and bulk procurement.
"How long can a very thin coaxial cable bundle be?" is a question frequently encountered by engineers when designing internal connections for high-speed equipment. In fact, there is no unified "maximum length" for extremely thin coaxial cables that is independent of specific applications. The achievable length ultimately needs to be determined by a comprehensive consideration of factors such as wire diameter, conductor structure, characteristic impedance, transmission speed, attenuation, insertion loss, return loss, crosstalk, and the overall system signal integrity requirements. Taking I-PEX 81465-100B-02-D as an example, the official evaluation samples of I-PEX CABLINE®-UM provide different length options with 30Pin, 40AWG Micro-Coaxial, and 1-N wire position definitions, including 100mm, 200mm, and 300mm specifications, so the 81465-100B-02-D corresponds to the 200mm length option. For engineering design, if the internal wiring distance of the equipment is short, it is advisable to use an appropriate length that meets the structural requirements, avoiding unnecessary extra wires and bends; if a longer distance is needed, it cannot be simply assumed that "adding 200mm will suffice," but rather a reevaluation of high-speed signal attenuation and impedance continuity is necessary. Especially in applications such as USB4, Thunderbolt 5, high-speed display, and industrial vision, the cable length directly affects the margin of high-speed signal transmission, so it is recommended to determine the final length based on the actual transmission speed and system SI test results, rather than simply pursuing a longer cable bundle.
When performing alternative design for engineers, it is recommended not to check only the "30Pin" parameter, but also to confirm the correspondence between I-PEX 81465-100B-02-D, 40AWG ultra-fine coaxial cable, 200mm length, 1-N line position definition, and 20878-030T-01 connector. The CABLINE®-UM connector system uses a 0.4mm pitch design and has features such as ZenShield® full shielding and mechanical locking, which is suitable for high-speed signal and high-density internal interconnection of equipment. Therefore, when looking for compatible alternative cables, it is important to focus on key items such as connector matching dimensions, Pin count, Pin assignment, wire diameter, wire length, wire exit direction, end stripping size, shielding structure, and impedance control. For purchasers, it is also necessary to further confirm the stability of raw materials, batch consistency, terminal crimping quality, shielding layer processing technology, and delivery capability. Our company can provide I-PEX 81465-100B-02-D compatible alternative cable solutions, which can be matched according to the actual equipment structure and electrical requirements of customers, for ultra-fine coaxial cable length, line position definition, connector configuration, and processing methods, providing corresponding alternative solutions for engineering verification, sample production, and mass production.
For projects that need to replace the I-PEX 81465-100B-02-D, it is recommended to first determine the actual wiring distance inside the device, and then determine the cable length in combination with the bend radius, assembly tolerance, and connector position. In the CABLINE®-UM evaluation samples, the 30Pin 40AWG Micro-Coaxial 1-N line-up scheme covers lengths of 100mm, 200mm, 300mm, etc. Therefore, engineers can use the 200mm 81465-100B-02-D as a reference benchmark and then adjust the length according to the internal space of the device. It should be especially noted that length changes do not necessarily mean only mechanical size changes: when the transmission distance of high-speed signals changes, cable attenuation, impedance consistency, and signal integrity may also change, so it is best to conduct actual high-speed signal tests for alternative products. At the same time, the alternative cable harness must ensure correct fit with the 20878-030T-01 connector and corresponding PCB end connector, and the 1-N line-up definition must not result in signal sequence errors. For procurement alternatives, it is recommended to conduct sample verification first and then determine the formal BOM and bulk specifications based on the verification results to reduce the risk of introduction.
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