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The SR-034C-25 is a 25 Ohm semi-rigid coaxial cable designed for RF and microwave applications that require low-impedance transmission and compact routing. With a 0.034 inch (0.86 mm) outer diameter, it follows the UT-034 size format while providing a 25 Ω configuration suitable for specialized RF circuits and power applications. The cable features a seamless copper tube outer conductor for complete RF shielding and minimal signal leakage, along with a silver-plated copper center conductor that offers high conductivity and non-magnetic performance for sensitive measurement environments. A PTFE dielectric ensures stable electrical characteristics across a wide temperature range, while the formable semi-rigid copper shield allows precise shaping during installation, making it ideal for RF test fixtures, microwave modules, laboratory instruments, and compact electronic assemblies where reliable signal integrity is required.
Key Features
25 Ohm impedance configuration - Optimized for specialized RF circuits, power-handling applications, and systems requiring lower characteristic impedance than standard 50 Ω cables.
0.034 inch semi-rigid form factor - Compact copper tube construction compatible with UT-034-size routing requirements in miniature microwave assemblies.
Non-magnetic conductor system - Silver-plated copper center conductor combined with a copper outer tube eliminates ferromagnetic materials for sensitive measurement environments.
Seamless copper outer conductor - Continuous metal shield provides extremely high RF isolation and prevents electromagnetic leakage in dense electronic systems.
High-frequency microwave capability - Suitable for RF and microwave transmission across a broad frequency range used in laboratory instruments and test equipment.
PTFE dielectric insulation - Maintains stable electrical performance, low dielectric loss, and reliable operation from −55 °C to +150 °C.
Formable semi-rigid structure - The copper tube can be shaped during installation, allowing precise routing inside enclosures, fixtures, and RF modules.
1200 VRMS High voltage tolerance - Designed to withstand high RF voltage levels in demanding microwave applications.
Custom cable preparation available - Supplied in bulk lengths or cut to specified dimensions for prototypes and production assemblies.
Connector integration options - Compatible with SMA, 2.92 mm, and other microwave connectors depending on required frequency performance.
Specifications
Construction
Item
Material
Diameter (in)
Diameter (mm)
Centre Conductor
Silver Plated Copper
0.0126
0.320
Dielectric
PTFE
0.0230
0.584
Outer Conductor
Copper Tube
0.034 +/- 0.001
0.864 +/- 0.025
Electrical Data
Capacitance (pF/m)
190.4
Impedance (Ohms)
25.0 +/- 2.0
Velocity of Propagation (%)
70.0
Max. Frequency (GHz)
148
Max. Voltage @60Hz (V RMS)
1200
Mechanical Data
Min. Bend Radius (mm)
1.27
Weight (kg/100m)
0.42
Environmental Data
Temperature Range (℃)
-55~+150
RoHS
Compliant
Attenuation and Power
Frequency (GHz)
Attenuation (dB/m)
Power (Watts cW@20℃)
0.50
1.10
30.0
1.00
1.60
21.2
5.00
3.60
9.4
10.00
5.20
6.6
18.00
7.10
4.8
26.5
8.70
4.0
40.00
10.9
3.2
50.00
12.4
2.8
65.00
14.3
2.5
90.00
17.2
2.1
Applications
RF power distribution networks - Low-impedance microwave interconnects used in power splitters, amplifiers, and RF distribution assemblies.
Microwave test equipment - Internal cabling for spectrum analyzers, signal generators, and RF measurement instruments.
Laboratory RF setups - Compact interconnects in experimental microwave circuits and research test benches.
Medical and diagnostic electronics - Non-magnetic RF wiring in sensitive medical instrumentation and imaging-related electronics.
Microwave modules and subsystems - Signal routing inside compact RF modules where stable impedance and strong shielding are required.
Custom RF assemblies - Semi-rigid cable used as the internal transmission line for microwave components and prototype circuits.
FAQ
Q: Why choose a 25 Ohm RF coax cable instead of the common 50 Ohm type?
A: Lower impedance cables can support higher current levels and are sometimes used in RF power circuits, impedance transformation networks, or specialized microwave designs where 50 Ω is not optimal.
Q: Is SR-034C-25 mechanically compatible with UT-034 type cables?
A: Yes. The cable maintains the same 0.034″ outer diameter format used by UT-034 size semi-rigid cables, making it suitable for similar routing spaces and connector tooling.
Q: What connectors can be used with this cable?
A: Depending on the required operating frequency, the cable can be terminated with SMA, 2.92 mm (K), or other microwave connectors designed for 0.034″ semi-rigid cables.
Q: Can the cable be pre-formed for assemblies?
A: Yes. Semi-rigid coax can be supplied straight or pre-bent according to mechanical drawings for production assemblies or test fixtures.
Q: What is the advantage of the copper tube outer conductor?
A: The seamless copper shield provides extremely high electromagnetic isolation and maintains consistent impedance along the cable length.
Q: What is the minimum order quantity?
A: Typical MOQ for 0.034″ semi-rigid cable is 10 meters, suitable for prototype and engineering applications.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Trading Company
Year Established:
2005
Total Annual:
12100000- 18600000
Employee Number:
11~50
Ecer Certification：
Verified Supplier
About Us—Shanghai Baiyin Cable Co., Ltd.
Since 2005, Shanghai Baiyin Cable Co., Ltd. has specialized in designing and manufacturing high-performance cables for demanding environments. Headquartered in Shanghai, we serve global industries with tailored solutions engineered for reliability, prec... About Us—Shanghai Baiyin Cable Co., Ltd.
Since 2005, Shanghai Baiyin Cable Co., Ltd. has specialized in designing and manufacturing high-performance cables for demanding environments. Headquartered in Shanghai, we serve global industries with tailored solutions engineered for reliability, prec...
