46 AWG Micro Coaxial Cable

46 AWG micro coaxial cable is the transition point between standard medical micro coax (42–44 AWG) and ultra-fine specialty constructions (48–50 AWG). At 46 AWG, the silver-plated conductor measures 0.040 mm — approximately half a human hair — achieving 0.30 mm finished cable OD with ePTFE dielectric and dual-layer shielding.

This 0.30 mm OD enables Applications where 42–44 AWG is physically too large: coronary IVUS catheters in sub-3 French shafts, capsule endoscopy modules, intracardiac echocardiography (ICE) arrays, and ultra-compact 512-channel transducer probes. At 46 AWG, engineers gain the miniaturization needed for catheter-scale devices while retaining volume-production yield rates that 48–50 AWG cannot match.

Complete Specifications — 46 AWG Micro Coaxial Cable

Solid vs. 19-Strand Construction

46 AWG is available in two conductor constructions. The choice directly impacts flex life, cost, and lead time:

Recommendation: Use solid conductor for single-use devices (1–10 procedures) or fixed installations. Use 19-strand for reusable catheters, robotic instruments, or any application exceeding 100,000 flex cycles at bend radius ≤ 15 mm.

When to Choose 46 AWG — Decision Guide

Key insight: 46 AWG costs 2–3× more than 42 AWG per meter, but enables catheter-scale devices that are physically impossible at 42–44 AWG. The cost premium is justified when miniaturization is the binding constraint.

Bundle OD at 46 AWG — Core Count Reference

At every core count, 46 AWG delivers approximately 35–39% smaller bundle OD versus 42 AWG — the difference between a device that fits inside a catheter shaft and one that does not.

Applications — Where 46 AWG Is the Right Choice

IVUS Catheters (Intravascular Ultrasound)
Coronary IVUS operates at 20–60 MHz with 1–64 transducer elements inside a 3.2–5.5 French catheter shaft. A 16-element bundle using 46 AWG achieves 1.4 mm bundle OD — fitting within a 5.5 Fr shaft (1.83 mm ID) alongside the guidewire lumen. The same 16 elements at 42 AWG would require 2.3 mm — physically impossible in a 5.5 Fr catheter. This dimensional constraint is why IVUS Catheter Cable s are exclusively 46–50 AWG.

Capsule Endoscopy
Wireless capsule endoscopes (11 mm × 26 mm) contain a CMOS image sensor (e.g., OV6946), LEDs, RF transmitter, and battery. Signal cables connecting the CMOS sensor to the processing ASIC must stay below 0.40 mm OD to fit alongside these components. 46 AWG at 0.30 mm OD provides the necessary miniaturization while maintaining 50 Ω impedance for clean video signal integrity.

Intracardiac Echocardiography (ICE)
ICE catheters place a 64-element phased-array ultrasound transducer inside a steerable 8–10 French catheter for real-time cardiac chamber imaging during structural heart procedures. A 64-channel bundle at 46 AWG achieves 3.4 mm OD — fitting within a 10 Fr catheter (3.3 mm ID) with steering wires. At 42 AWG, the same bundle would be 5.4 mm — requiring a 16+ Fr catheter, which is clinically unacceptable.

512-Channel Dense Ultrasound Arrays
Next-generation matrix array probes target 512 channels for volumetric real-time 3D imaging. At 42 AWG, a 512-channel bundle measures 13.7 mm OD — too large for an ergonomic handheld probe. At 46 AWG, the same 512 channels fit within 8.8 mm OD — enabling a probe form factor that clinicians can hold comfortably during extended examinations.

Electrophysiology (EP) Mapping Catheters
High-density EP mapping catheters (e.g., 64-electrode basket catheters) require individual shielded signal paths for each electrode to reject RF noise from adjacent ablation energy. 46 AWG coaxial elements provide per-channel shielding at catheter-compatible dimensions.

Attenuation and Signal Integrity at 46 AWG

Higher AWG means smaller conductor cross-section, which means higher DC resistance and higher signal attenuation per meter. This is the fundamental tradeoff of miniaturization.

At IVUS frequencies (20–60 MHz) over typical catheter cable lengths (1.0–1.5 m), 46 AWG attenuation is 2.7–6.75 dB — within the dynamic range of modern IVUS receivers (typically 40–60 dB). The additional loss versus 42 AWG (approximately 1.5–3.0 dB at 1.5 m) is compensated by receiver gain adjustment.

For frequencies below 15 MHz at cable runs under 2 m, the attenuation difference between 42 AWG and 46 AWG is clinically insignificant (< 2 dB total).

Comparison — 46 AWG vs. Junkosha MCT-300 Series

Key advantage: Equivalent electrical and mechanical specification with 4–6 week lead time versus 12–20 weeks, lower MOQ (500 m vs. 5,000 m), and 30–45% lower unit cost. For IVUS and catheter programs in development phase, this means faster design iteration with lower inventory commitment.

Ordering Information — 46 AWG

Standard configurations (4–6 week lead time):
- 46 AWG solid conductor, ePTFE, 50 Ω, FEP jacket, 0.30 mm OD — 500 m reel
- 46 AWG 19-strand rope-lay, ePTFE, 50 Ω, PFA jacket, 0.30 mm OD — 1,000 m reel
- 46 AWG phase-matched bundle (8/16/32/64 cores) — per specification

Custom options:
- 75 Ω impedance (for specific imaging protocols)
- Color-coded jacket for element identification within bundles
- Connector termination: Microdot, LEMO 00, custom crimp
- ISO 10993-5/10 biocompatibility testing (add 2–3 weeks for test report)
- Sterilization compatibility validation (EtO, gamma, autoclave)

Frequently Asked Questions

Is 46 AWG the finest micro coaxial cable available?

No — we produce 48 AWG (0.24 mm OD) and 50 AWG (0.19 mm OD). However, 46 AWG is the finest practical gauge for volume production with consistent yield rates (92–96%). At 48 AWG, yield drops to 85–90%; at 50 AWG, to 75–85%. For most IVUS and catheter designs, 46 AWG provides optimal balance of miniaturization and manufacturing economics.

How does 46 AWG compare to Junkosha MCT-300?

Our 46 AWG matches Junkosha MCT-300 on all published electrical and mechanical parameters: conductor diameter, cable OD, impedance, dielectric material, VoP, and flex life. Key differences: our lead time is 4–6 weeks (vs. 12–20 weeks), MOQ is 500 m (vs. typically 5,000 m), and pricing is 30–45% lower at equivalent specification.

Can 46 AWG be phase-matched in bundles?

Yes. Same TDR-based process as our 42–44 AWG phase matching: measure every cable, sort into ±0.25% bins, assemble and verify to ±1.0% or ±0.5%. Phase matching at 46 AWG requires more precise dielectric control due to higher sensitivity to wall thickness variation, but is a standard production capability.

What is the maximum cable length for IVUS at 40 MHz?

At 40 MHz with 46 AWG, attenuation is approximately 3.2 dB/m. At 1.5 m (standard IVUS catheter length), total loss is 4.8 dB — well within IVUS receiver dynamic range (40–60 dB typical). Maximum practical length at 40 MHz: approximately 3 m before signal-to-noise becomes limiting. At 60 MHz: approximately 2 m.

Solid or 19-strand for a disposable IVUS catheter?

Solid conductor. A disposable IVUS catheter sees 1–5 procedures (10–50 total insertions). Solid conductor flex life of 100,000+ cycles at 8 mm radius far exceeds this requirement. Solid costs 40–60% less than 19-strand and has tighter impedance tolerance (±1.5 Ω vs. ±2.0 Ω). Reserve 19-strand for reusable devices exceeding 100,000 flex cycles.

Does 46 AWG require special termination equipment?

Yes. At 0.040 mm conductor diameter, manual soldering is impractical. We use laser-assisted or resistance micro-welding for conductor termination and automated wire stripping with optical verification. Connector termination is included in our cable assembly service — customers do not need to invest in specialized equipment.

Need 46 AWG for IVUS, capsule endoscopy, or ICE catheter? Share catheter French size, channel count, and operating frequency — engineering quote within 48 hours.

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