MWA-SR-025A-LL Low Loss 50Ω Semi-Rigid Coax for Microwave Ablation Needle

The MWA-SR-025A-LL is a 50Ω semi-rigid coaxial cable engineered for microwave ablation and compact medical RF applications where conductor breakage and transmission loss are persistent problems.

The 0.175mm silver-plated copper alloy center conductor provides roughly 90% more cross-sectional area than conventional 0.127mm designs — while maintaining the same 0.635mm outer diameter. The LD-PTFE dielectric and seamless copper tube outer conductor deliver 2.9 dB/m attenuation at 2.45GHz and 17W CW power handling.

Medical device engineers specify this cable when they need to deliver more power to the ablation tip, reduce assembly scrap from conductor breakage, and upgrade reliability without redesigning needle lumens or connector interfaces.

• 90% larger conductor cross-section
  0.175mm vs 0.127mm. Higher tensile strength, lower DC resistance, less ohmic heating. Fewer scrapped assemblies during stripping and welding.
• 2.9 dB/m at 2.45GHz
  LD-PTFE dielectric and silver-plated copper alloy minimize transmission loss. More energy reaches the ablation tip for predictable lesions.
• 17W CW power handling
  Larger cross-section and higher conductivity enable continuous power well beyond 0.127mm designs.
• 0.635mm OD — drop-in compatible
  Same outer diameter as standard 0.127mm cables. No changes to connectors, strain reliefs, or needle lumens.
• -55°C to +200°C
  Withstands autoclave sterilization and extended high-power operation.
• Non-magnetic, RoHS compliant
  All non-ferromagnetic materials. Safe for MRI-guided procedures. Full RoHS documentation available.
• Custom lengths
  cut to exact specifications for prototype and production quantities
• Connector options
  bare ends, SMA, 2.4mm, 1.85mm pigtails, or fully connectorized assemblies

• Microwave ablation needles — Manufacturers report 60% fewer conductor breakages during assembly after switching from 0.127mm cables, while delivering more consistent power to the tip.
• Minimally invasive applicators — Semi-rigid construction provides pushability through narrow introducers with stable RF performance during manipulation.
• Compact medical RF assemblies — 0.635mm OD allows multiple channels in tight instrument housings without compromising power handling.
• MRI-compatible probes — Non-magnetic construction eliminates image artifacts during MRI-guided procedures.
• High-temperature components — Withstands aggressive sterilization cycles with no attenuation drift.
• R&D prototyping — Electrical performance matches production intent from bench to final device.

Q: What makes MWA-SR-025A-LL different from standard 0.127mm semi-rigid cables?
A: The 0.175mm center conductor provides roughly 90% larger cross-section area compared to 0.127mm designs. Combined with silver-plated copper alloy (instead of copper-clad steel), this delivers significantly higher mechanical strength, lower attenuation, and better power handling — all in the same 0.635mm outer diameter. At 2.45GHz, attenuation is 2.9 dB/m versus 3.5-4.5 dB/m typical for 0.127mm designs.

Q: Can I directly replace my existing 0.127mm cable with this?
A: Yes. Outer diameter is identical at 0.635 ± 0.025mm. Impedance is 50 ± 2Ω. Connectors and termination methods are the same. Your stripping tools may need minor adjustment for the thicker 0.175mm conductor, but no mechanical design changes are required for the cable path, strain relief, or needle lumen.

Q: What is the maximum power the cable can handle?
A: 17W continuous wave at 20°C ambient. Power handling must be derated at elevated temperatures — consult the attenuation/power table in the datasheet for derating curves. This is substantially higher than 0.127mm designs with copper-clad steel conductors.

Q: Is the cable suitable for MRI-guided ablation procedures?
A: Yes. The cable is fully non-magnetic — all materials are non-ferromagnetic. It can be used in MRI environments without image artifacts or safety concerns.

Q: What is the minimum bend radius?
A: 1.27mm (0.050 inches) for static applications. The semi-rigid copper tube holds its formed shape without spring-back, allowing precise routing inside instrument housings.

Q: What documentation is available for regulatory submissions?
A: RoHS compliance declaration is standard. For ISO 9001 biocompatibility, material declarations and test reports are available upon request. Full mechanical and electrical test data can be provided for your device regulatory filings.

Q: Can I get samples for evaluation?
A: Yes. Sample lengths are available from stock. We can pre-strip ends or cut to your specified lengths for direct testing in your assembly process. Samples include attenuation and impedance test data.

Q: What is the typical lead time?
A: Standard lengths: 2-3 weeks from order confirmation. Custom lengths or pre-stripped ends: 3-4 weeks. Production volume pricing available.

Q: Can you provide custom stripping or pre-formed shapes?
A: Yes. We accept custom stripping specifications and can form cables to your mechanical drawings. Send a dimensioned sketch or 3D model with bend radii and locations — we deliver formed assemblies with continuity testing.