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Product

Medical Micro-Coaxial & Ultra-High-Vacuum Cables36–46 AWG Micro-Coax50 Ω & 75 Ω · ≤ 40 pF/m48–256 Ch Probe Bundles

Micro-Coaxial Cable for Medical and Precision EquipmentIEC 61196-1 · 50 Ω & 75 Ω · 36 to 46 AWG · Ag-Cu alloy · Solid/Foam PFA (≤ 40–65 pF/m) ·

Micro-Coaxial Cable for Medical and Precision Equipment is an ultra-miniature 50 Ω or 75 Ω coaxial cable (single-core OD 0.22 mm to 0.55 mm, 36 AWG to 46 AWG) engineered with a high-tensile silver-plated copper-alloy conductor, thin-wall solid or foamed

EMC screen
Low-EMC design
Flame-retardant
Water-resistant
Order designation
38 AWG 50 Ω Solid PFA Micro-Coax
Outer Ø ≈
0.44 mm
Metal weight
0.4 kg/km
Total weight ≈
0.7 kg/km
Min. bend R (fixed)
2 mm
All sizes (4)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Impedance Z₀
50 Ω or 75 Ω ±
Custom 60–90 Ω probe matching
Conductor gauge
36 to 46 AWG
7-strand high-flex Ag-Cu alloy
Single coax OD
0.22 to 0.55 mm
Ultra-thin PFA jacket (0.025 mm wall)
Capacitance
40 to 65 pF/m
Foamed PFA (78 % VoP) or solid PFA
Flex endurance
> 1,000,000
± 90° probe strain-relief flex test
Bundle counts
16 to 256 chann
Biocompatible medical PVC/TPU sheath

Typical values for this cable type, based on IEC 61196-1 / ISO 10993 / UL Style 1354 — confirmed in the datasheet and quotation for your order.

Application fit

Is Micro-Coaxial Cable for Medical and Precision Equipment right for your machine?

Purpose-engineered for diagnostic ultrasound probes (phased-array, linear, convex, 3D/4D TEE, ICE catheters), HD CMOS/CCD surgical endoscopes, micro-gimbal drone payloads, and Automated Test

Trailing & towing

Suitable

7-strand silver-plated copper-tin/silver alloy conductors survive > 1,000,000 handheld ultrasound probe flex cycles.

Self-supporting pendant & push-button drop

Suitable

Precision helically served spiral shield and PTFE/ePTFE binder tape allow effortless multi-axis wrist articulation.

Switchgear & control cabinet wiring

Suitable

Sub-half-millimetre single coax OD routes through miniature hinges, AR/VR headsets, and wafer-probe cards.

Fixed installation

Suitable

Laser-strippable thin-wall PFA insulation enables automated hot-bar mass termination on 0.25–0.50 mm pitch PCBs.

Typical machinesDiagnostic Ultrasound Transducer Probes4K Surgical Endoscopes & LaparoscopesIntravascular (IVUS / ICE) CathetersSemiconductor ATE & Wafer Probe CardsMicro-Gimbal UAV & Robotics Vision

Construction

Layer by layer

7-strand 36–46 AWG silver-plated high-strength copper alloy center, thin-wall solid or cellular PFA dielectric, 0.025–0.030 mm

1234
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Ultra-fine 7-strand Ag-Cu alloy7 × 0.016 mm (46 AWG) to 7 × 0.050 mm (36 AWG) silver-plated high-tensile Cu-Sn/Cu-AgASTM B298 / Custom
2Thin-wall solid or cellular foamed PFAPrecision micro-extruded perfluoroalkoxy (PFA, 70 % VoP) or low-capacitance foamed PFAUL 1354 / IEC 61196
3Micro-served spiral or braided shield0.025–0.030 mm (50–48 AWG) silver-plated copper alloy spiral serve (≥ 92 % coverage) forIEC 61196-1
4Laser-strippable PFA micro-jacket (+0.020–0.030 mm colour-coded PFA jacket on each coax; 16–256 coax assemblies over-braidedISO 10993-5/-10

40 AWG 50 Ω / 75 Ω Micro-Coax (OD 0.32–0.38 mm)

Workhorse gauge for 64, 128, and 192-channel cart-based diagnostic ultrasound transducer assemblies.

42–44 AWG Low-Cap 75 Ω Foamed PFA (≤ 45 pF/m)

Minimizes capacitive loading on piezoelectric crystal elements to maximize transducer sensitivity and

46 AWG Sub-Miniature Catheter Coax (OD 0.22 mm)

Ultra-fine micro-coax for intracardiac echocardiography (ICE), IVUS catheters, and flexible video

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on IEC 61196-1 / ISO 10993 / UL Style 1354. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance Z₀
50 Ω ± 3 Ω or 75 Ω ± 3 Ω (custom 60–85 Ω)
Nominal capacitance (50 Ω / 75 Ω)
95 pF/m (50 Ω) / 40–65 pF/m (75 Ω Foam/PFA)
Velocity of propagation (VoP)
70 % (Solid PFA) / 78–82 % (Foamed PFA)
Conductor DC resistance (40 / 42
≤ 3.6 / ≤ 5.8 / ≤ 9.2 Ω/m at 20 °C
Max. operating pulse voltage
100–200 V peak-to-peak (piezo transmit)
Dielectric withstand test
500 V rms at 60 Hz

Thermal

Single micro-coax temperature range
-40 °C to +200 °C (PFA fluoropolymer)
Medical bundle outer sheath range
-20 °C to +80 °C (medical PVC/TPU) / +150
Hot-bar & laser termination heat
Withstands +260 °C soldering without
Sterilization compatibility
EtO, STERRAD H₂O₂ plasma & wipe disinfectants
Autoclave steam option
+134 °C steam autoclave (silicone outer
Flammability rating
UL 1354 / UL VW-1

Mechanical

Conductor gauge range
36, 38, 40, 42, 44, and 46 AWG (7-strand)
Single micro-coax outer diameter
0.22 mm (46 AWG) to 0.55 mm (36 AWG)
Complete 128-ch bundle diameter
7.2 mm to 9.2 mm (ultra-limp medical trunk)
Min. bend radius (single / bundle)
4 × D (single coax) / 6 × D (probe trunk)
Flex fatigue life (± 90° bend test)
> 1,000,000 cycles (200 g load)
Mass termination pitch
Compatible with 0.25–0.50 mm hot-bar PCBs

Resistance

Biocompatibility (outer sheath)
ISO 10993-5 (cytotoxicity) & -10 (irritation)
Hospital disinfectant resistance
Resistant to IPA, Cidex, bleach &
Acoustic / triboelectric noise
Low-noise lubricated PTFE binder & shield
Inter-channel RF crosstalk
< -65 dB between adjacent bundle channels
Tensile break strength (alloy core)
> 650 MPa high-strength Cu-Sn/Ag alloy
RoHS / REACH / MDR status
RoHS 3 & EU MDR phthalate-free

Reference standards

Coaxial transmission standard
IEC 61196-1
UL appliance wiring style
UL Style 1354 / 1577 / 1911 (30 V, +200 °C)
Biocompatibility standard
ISO 10993-1 / -5 / -10 (USP Class VI)
Medical electrical safety
IEC 60601-1 patient-applied part isolation
Conductor standard
ASTM B298 silver-plated copper alloy
Quality certification
EN 10204 3.1 + 100 % TDR & capacitance report

Identification

Single micro-coax PFA colours
10 EIA colours (translucent/solid PFA)
Sub-bundle group binders
Colour-coded ePTFE threads (8/16-ch groups)
Medical trunk outer sheath
Medical grey (RAL 7035/7047), white, or black
Surface legend
Unprinted hospital wipe-clean or custom OEM
Delivery format
Precision bobbins (single coax) or 16–256
Batch traceability
Medical device lot traceability

Sizes

4 standard configurations (Micro-Coaxial Cable for Medical and Precision Equipment)

Dimensional, physical and high-frequency electrical parameters for Micro-Coaxial Cable for Medical and Precision Equipment per IEC 61196-1 / ISO 10993 / UL

Dimensions & construction
Order designationConstruction / VariantConductorOuter Ø ≈
mm		Metal
kg/km		Weight ≈
kg/km		Min. bend R
fixed mm		Enquiry
Standard Micro-Coaxial Cable for Medical and Precision Equipment variants
38 AWG 50 Ω Solid PFA Micro-Coax50 Ω Spiral Ag-Cu Shield (PFA)38 AWG (7×0.040)0.440.40.72
40 AWG 75 Ω Low-Cap Foamed PFA (48 pF/m)75 Ω Spiral Ag-Cu Shield (PFA)40 AWG (7×0.032)0.360.30.51
42 AWG 75 Ω Low-Cap Foamed PFA (45 pF/m)75 Ω Spiral Ag-Cu Shield (PFA)42 AWG (7×0.025)0.300.20.31
128-Channel 40 AWG Ultrasound Probe Bundle128× 40 AWG Coax + Overall Braid128 × 40 AWG8.2046.088.033
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Dimensions and weights are nominal production values subject to manufacturing tolerances per IEC 61196-1 / ISO 10993 / UL Style 1354.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % capacitance, TDR impedance & spark test50/75 Ω ± 3 Ω; capacitance within ± 2 pF/m across all channelsEvery bobbin / bundle
500 V AC dielectric & channel-to-channel shortsZero breakdown or open/short across 100 % of bundled coresEvery bundle
Sample tests
Laser-strip cleanliness & hot-bar solderabilityClean UV/CO₂ laser window stripping without shield nickingPer production lot
1,000,000-cycle ± 90° probe flex & ISO 10993< 5 % resistance shift after 1M flexes; passes biocompatibilityQualification

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

UL Style 1354 / IEC 61196ISO 10993-5 / -10RoHS 3 / EU MDR

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

TEBAOFLEX MEDICAL MICRO-COAXIAL [36-46 AWG]
Delivery form
Spools, reels or export wooden drums
Standard reel lengths
100 m · 305 m (1000 ft) · 500 m · 1000 m
MOQ
100 m (stock) · 305–500 m (production)
Lead time
1–3 weeks ex-works
Incoterms
EXW, FCA, FOB, CIF, DAP

Technical documents

Downloads

PDFMicro-Coaxial Cable for Medical and Precision Equipment – technical datasheet4 sizes · construction, technical data, approvalsXLSXMicro-Coaxial Cable for Medical and Precision Equipment spec data (Excel)All 4 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why is low capacitance (≤ 40–50 pF/m) so important in medical ultrasound probe cables?
Piezoelectric ultrasound transducer elements have a tiny intrinsic capacitance (often 10–30 pF); a cable with high capacitance forms a capacitive voltage divider that attenuates weak return echoes, so our foamed-PFA 75 Ω micro-coax lowers capacitance to 40–48 pF/m to boost signal-to-noise ratio and penetration depth.
Why do medical micro-coaxial cables use a spiral (served) shield instead of a woven braid?
On a 0.25–0.40 mm coaxial core, a helically served 0.025 mm silver-plated copper-alloy spiral shield eliminates braid crossover bumps, reduces outer diameter by 15 %, increases flexibility for a draper-like hand feel, and can be rapidly stripped and combed for mass hot-bar PCB soldering.
How do 40–46 AWG conductors survive over 1,000,000 flexing cycles without breaking?
Instead of soft annealed copper, we use a 7-strand precipitation-hardened silver-plated copper-tin or copper-silver alloy with > 650 MPa tensile strength, stranded with ultra-short lay lengths. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.
Can you supply both single micro-coaxial bobbins and complete 48–256 channel ultrasound trunks?
Yes, we supply both colour-coded single micro-coaxial spools for in-house bundling and finished 16 to 256-channel medical trunks complete with ePTFE sub-binders, overall tinned/silver copper braid, and an ISO 10993-certified limp PVC, TPU, or silicone outer jacket. Each production reel undergoes sweep-frequency impedance and return-loss verification, dielectric spark testing, and dimensional inspection before dispatch with an EN 10204 3.1 test certificate.

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