Micro coaxial cable (or micro-coax) is a type of coaxial cable with an extremely small diameter, designed to carry high-frequency or high-speed signals in space-constrained applications. It is widely used in smartphones, tablets, high-definition cameras, automotive electronics, 5G communications, and medical devices, where both size and signal integrity are critical.
🔬 Structure and Key Parameters
A micro coaxial cable consists of four main layers:
Center Conductor: A thin wire, often made of silver-plated copper or copper-clad steel.
Dielectric Insulation: A low-loss material like PTFE or FEP that separates the center conductor from the shield.
Shielding: A braided or foil shield, typically >90% coverage, to minimize electromagnetic interference (EMI).
Outer Jacket: A protective layer, usually made of PFA or FEP, which provides mechanical strength and chemical resistance.
Typical Datasheet Specifications:
Datasheets for cables like Molex Temp-Flex 50MCX-37 or Alpha Wire 9444 WH033 provide detailed parameters:
Parameter
Example Value (50MCX-37)
Example Value (9444 WH033)
Impedance
50 Ω
50 Ω
Outer Diameter
~0.30 mm
0.25 mm
Conductor
42 AWG stranded, silver-plated copper
7/0.020 mm stranded, silver-plated copper
Insulation
PFA
PFA
Shielding
Braided shield
Tinned copper braid
Jacket
PFA, blue
PFA, white
Capacitance
Not specified
~110 pF/m
Operating Temp
Not specified
-70 °C to +150 °C
📥 How to Download Micro Coaxial Cable Datasheets
Here are the most effective ways to find and download datasheets for specific micro-coax models.
1. Manufacturer Websites (Most Reliable)
This is the most direct and reliable method.
Identify the Manufacturer: Look for the brand name on the cable, reel, or connector (e.g., Molex/Temp-Flex, Alpha Wire, Heatsense, Hirose, Mini-Circuits).
Navigate to the Product Page: Go to the “Products” or “Cables” section of the manufacturer’s website.
Search for the Part Number: Enter the exact part number (e.g., 50MCX-37, 9444 WH033, 141-9SMRSM+) into the search bar.
Locate and Download: Find the datasheet link on the product page and download the PDF.
2. Global Datasheet Databases
These sites aggregate datasheets from many manufacturers.
ALLDATASHEET.COM: A massive library where you can search by part number (e.g., MMCX-SR-PC, CM-105C) or keywords like “micro coaxial cable”.
DatasheetArchive.com: Another comprehensive archive. Use advanced search with filters for “Document Tags: PDF” and “Context: micro coaxial cable” to find relevant PDFs and connector information.
3. Electronic Component Distributors
Distributors like Digi-Key, Mouser, and RS Components provide datasheets for the products they sell.
Search for the Part: Use the exact part number on the distributor’s website.
Access the Datasheet: On the product detail page, click the “Download Datasheet (PDF)” link, usually found near the specifications.
4. Specialized Component Suppliers
For specific regions or niche products, searching for the manufacturer’s name plus “micro coax datasheet” on Google can lead to their official PDF downloads or pages listing multiple datasheet links.
💡 Quick Example Downloads
Here are direct links to datasheets for some common micro-coax cables and assemblies:
MMCX-SR-PC (DDK): A micro-miniature coaxial connector. Search for “MMCX-SR-PC datasheet” on ALLDATASHEET.COM to find the 5-page PDF from DDK.
50MCX-37 (Molex/Temp-Flex): A 42 AWG, 50 Ω micro-coax. Search for “50MCX-37 datasheet” on 21icsearch.com or “100065-0023 datasheet” on买卖IC网 to find the PDF with detailed specs.
9444 WH033 (Alpha Wire): A 0.25 mm, 50 Ω micro-coax. Search for “9444 WH033 datasheet” on the RS Components website to access the full specifications.
141-9SMRSM+ (Mini-Circuits): A high-frequency coaxial cable assembly (DC–18 GHz). Search for “141-9SMRSM+ datasheet” on ALLDATASHEET.COM or minicircuits.com to get the 3-page PDF.
✅ How to Read a Micro Coax Datasheet
Datasheets can be dense. Here’s a guide to the most important sections:
General Description: Confirms the product type, impedance (usually 50 Ω), and key applications.
Mechanical Dimensions: Details the cable’s outer diameter, conductor size (AWG), and minimum bend radius.
Electrical Characteristics: The most critical section, including impedance, frequency range, attenuation vs. frequency, voltage rating, and shielding effectiveness. Pay close attention to the attenuation table to ensure the cable is suitable for your required length and frequency.
Material and Environmental: Lists materials for each layer and specifies operating and storage temperatures.
Compliance and Ordering Information: Includes RoHS/REACH status and how to order the cable (e.g., by reel length).
🎯 Common Applications
Micro coaxial cables are chosen for their ability to maintain signal integrity in tight spaces.
Mobile Devices: Connectors for cameras, displays, antennas, and high-speed digital lines (LVDS, MIPI).
High-Speed Data Links: Used in test equipment and communication systems for their low-loss properties at GHz frequencies.
Medical & Industrial Imaging: Ideal for endoscopes and probes where the cable must be thin, flexible, and reliable.
Aerospace & Harsh Environments: Used in specialized cables from manufacturers like Heatsense, which offer extreme temperature ranges and custom designs.
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I-PEX is a global leader in micro coaxial cable solutions, specializing in high-performance IPEX micro coax connectors and micro coaxial cable assemblies. These products are designed for.
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