In today's era of high-speed data transmission, high-definition display, and widespread application of miniaturized devices, the ultra-thin coaxial cable (Micro Coaxial Cable) is being widely used in consumer electronics, medical equipment, and automotive systems due to its excellent signal performance and flexibility. However, during the selection and connector matching process, many engineers and purchasing personnel often fall into some "seemingly reasonable" traps. This article takes the JAE FI-RE41CL connector as an example to analyze the three most common problems in the application of ultra-thin coaxial cable bundles and professional suggestions.
Misconception 1: Believing that all ultra-fine coaxial cables have the same performance
Many people mistakenly believe that as long as it is a micro coaxial cable, its performance and specifications are roughly the same, and they can be used at will.
In fact, ultra-fine coaxial cables are differentiated in terms of outer diameter (usually 0.3 mm ~ 1.37 mm), characteristic impedance (commonly 50 Ω), shielding structure, and conductor material. These parameters directly determine signal integrity and transmission stability.
Professional advice:
When selecting wire materials, they should be matched according to the application scenario, signal frequency, bending performance, and durability requirements, and avoid a "one-size-fits-all" approach.
Misconception two: Neglecting the matching specifications of connectors
In the early stage of project design, many teams only focus on wire parameters, but ignore the compatibility of connectors.
For example, JAE FI-RE41CL is a high-density, fine-pitch (0.5 mm pitch) connector specifically designed for micro coaxial cables, widely used in liquid crystal displays, industrial cameras, and medical imaging equipment. This model supports 41 Pin high-density wiring and has excellent vibration resistance and signal integrity, with strict specifications for wire diameter, welding method, and insertion/removal times. If non-matching cables are used, it is easy to cause signal attenuation, cold solder joints, or even connector damage.
Professional advice:
Choose micro coaxial cable materials that are officially certified or recommended by JAE FI-RE41CL to ensure reliable and long-term stability of the connection.
Three,误区三：Underestimating the importance of processing technology
The processing process of extremely thin coaxial cable bundles is complex, involving multiple key steps such as stripping, welding, shielding treatment, and sheath fixation.
Any detail error may affect the performance of the entire harness. Especially the 41-pin high-density structure of FI-RE41CL, which requires extremely high welding accuracy; slight deviation may lead to short-circuit or poor welding.
Professional advice:
Select suppliers with rich experience in micro coaxial processing and those who have passed the official process verification by JAE to ensure process quality.
Four, JAE FI-RE41CL Connector Introduction
Basic parameters
• Model: FI-RE41CL (Made by Japan Aviation Electronics JAE)
Series: FI-R Series Welded Plugs (Plug, Solder Type)
Extremum: 41 Pins
Space: 0.5 mm
Matching wire diameter: 36 AWG and above ultra-fine miniature coaxial cable
Structure and Characteristics
属于 0.5 mm pitch welding-type connector with spring clamp mechanical lock (Shell Cover optional model: FI-RE41CL-SH2-3000)
• The plug and socket (Receptacle) are universal for the FI-RE41 series, supporting crimp, welding, FFC, and other connection methods.
Compliant with VESA LCD interface standards, supporting LVDS, TMDS/HDMI, PCIe and other high-speed signal transmission
Application scenarios
Widely used in vehicle image systems, industrial/medical image equipment, laptops, monitors, and high-speed data transmission equipment.
Extremely thin coaxial cable bundles may be small, but they contain many key details. Do not lightly believe the saying "as long as the specifications are similar, it can be used"—only by reasonably matching connectors, selecting materials accurately, and ensuring the quality of processing, such as high-density connection solutions like JAE FI-RE41CL, can the long-term stability and high-performance operation of the project be guaranteed.
We have been focusing on the design and customization of high-speed signal cable harnesses and ultra-thin coaxial cable harnesses for a long time, committed to providing stable and reliable high-speed interconnect solutions. If you have any related needs or want to learn more, please contact: Manager Yin.
18913280527 (WeChat same number). 
