Litz Wire – Stranded Enameled Copper Wires for High-Frequency Applications
| Base Wire: QA-1/155 | Thermal Class: 155°C (F) | Strands: 2 to multi-strand | Solderable: Directly (no stripping) |
Litz wire, derived from the German word Litzendraht meaning “stranded wire,” is constructed by twisting multiple individually insulated enameled copper strands together in a specific pattern. This unique construction effectively reduces AC resistance caused by the skin effect and proximity effect at high frequencies, making it an ideal choice for high-efficiency transformers, inductors, and wireless power transfer systems.
CHINGCUNG offers high-quality litz wires manufactured from QA-1/155 polyurethane enameled copper round wires, available in strand counts ranging from 2 to multiple strands, with customizable stranding patterns to meet your specific application requirements.
1. Product Overview
| Base Wire Model | QA-1/155 (Polyurethane Enameled Copper Wire) |
| Thermal Class | 155°C (Class F) |
| Conductor Material | Annealed Copper |
| Strand Count | 2 strands to multiple strands (customizable) |
| Insulation Type | Polyurethane (solderable directly) |
| Film Grade | Grade 1 |
| Key Feature | Solderable without prior insulation removal |
Key Advantage: The use of QA-1/155 polyurethane enameled wire allows direct soldering of the litz wire terminations without the need to strip the insulation, significantly simplifying the termination process.
2. Why Litz Wire?
At high frequencies, conventional solid conductors suffer from increased AC resistance due to:
· Skin effect – current concentrates on the conductor surface
· Proximity effect – current distribution is distorted by adjacent conductors
Litz wire mitigates these effects by:
· Reducing eddy current losses
· Improving current distribution across the conductor cross-section
· Enhancing overall efficiency of high-frequency components
3. Construction & Stranding Patterns
| Strand Count | Typical Construction | Common Applications |
| 2 – 5 strands | Simple twist | Small inductors, RF coils |
| 6 – 20 strands | Concentric stranding | Medium-power transformers |
| 21 – 60 strands | Compound stranding | High-power inductors, wireless charging |
| 60+ strands | Custom stranding | High-frequency high-power applications |
Standard stranding patterns available:
· Concentric stranding – uniform lay length for consistent electrical performance
· Unidirectional stranding – all strands twisted in the same direction
· Bunched stranding – multiple strands twisted together without a central core
4. Specifications (Reference Table)
| No. | Strand Count | Conductor Dia. per Strand (mm) | Stranding Type | Approx. Overall Dia. (mm) | Typical Resistance (Ω/km) |
| 1 | 2 | 0.10 | Simple twist | ~0.24 | ~4,400 |
| 2 | 5 | 0.10 | Concentric | ~0.38 | ~1,760 |
| 3 | 10 | 0.10 | Concentric | ~0.55 | ~880 |
| 4 | 20 | 0.08 | Compound | ~0.60 | ~1,100 |
| 5 | 30 | 0.08 | Compound | ~0.74 | ~733 |
| 6 | 50 | 0.07 | Compound | ~0.85 | ~592 |
Custom strand counts, diameters, and stranding patterns are available upon request.
5. Performance Characteristics
| Thermal Class | 155°C (continuous) |
| Solderability | Directly solderable (polyurethane insulation – no stripping required) |
| AC Resistance Reduction | Significant reduction vs. solid conductor at high frequencies |
| Operating Frequency Range | Optimized for 10 kHz – 1 MHz |
| Insulation Voltage Rating | Basic insulation, suitable for low to medium voltage applications |
| Flexibility | Excellent – suitable for tight bending and dynamic applications |
| RoHS Compliance | Compliant |
6. Typical Applications
| Application | Description |
| High-Frequency Transformers | SMPS, resonant converters, and flyback transformers |
| Inductors & Chokes | PFC chokes, differential mode chokes, and common mode chokes |
| Wireless Power Transfer | Qi-compatible charging coils and resonant coupling systems |
| RF Coils & Antennas | Low-loss coils for RF identification and communication |
| Medical Equipment | MRI coils and precision diagnostic instruments |
| Electric Vehicles | On-board chargers and wireless charging systems |
7. Quality Standards
| GB/T 6109.10-2008 | Enamelled round winding wires – Class 155 polyurethane |
| IEC 60317-20: 2000 | Enamelled round copper wire – Class 155 polyurethane |
| RoHS | Compliant – free from restricted hazardous substances |
All CHINGCUNG litz wires are manufactured in ISO 9001 certified facilities with full traceability.
8. Why Choose CHINGCUNG?
· Material expertise – QA-1/155 polyurethane enameled wire with proven solderability
· Flexible production – from 2 strands to multi-strand configurations
· Customizable – strand count, diameter, and stranding pattern tailored to your needs
· Quality assurance – strict process control from raw material to finished litz wire
· Global service – serving customers in North America, Europe, and Asia
9. Ordering Information
| Model Format | QA-1/155-5/0.10 (example: 5 strands, 0.10mm dia.) |
| Minimum Order Quantity | Sample orders accepted |
| Lead Time | 1–2 weeks depending on quantity and complexity |
| Packaging | Spool or coil packaging available |
Need a litz wire sample or technical datasheet?
Contact our team for free samples, detailed specifications, or engineering consultation.
Request a Sample View Products
Tel: +86-13621982708 | www.evmagnetwire.com
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Litz Wire QA155– Stranded Enameled Copper Wires for High-Frequency Applications Images
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