Air core coil WL4520

high-frequencyRFthrough-hole type

Product Overview
The WL4520 air-core multi-layer coil is a compact electromagnetic inductor designed for stable inductance, low loss and high-frequency performance in sensor and RF systems. Its air-core, multi-layer winding provides elevated inductance density while avoiding core saturation and ferromagnetic losses, making it suitable for precision signal processing and wireless modules.

Design & Customization
The WL4520 features a multi-layer enameled-copper winding arranged to maximize Q factor and thermal stability under continuous operation. Standard and custom options include wire diameter, number of turns, coil dimensions, bobbin material and mounting style to match OEM requirements.

Key Characteristics

• Air-core (no magnetic core) — eliminates saturation
• High Q factor optimized for RF/high-frequency ranges
• Linear inductance with low signal distortion
• Stable inductance over typical operating temperatures
• Compact multi-layer construction for increased inductance per volume

Applications

• Wireless charging coils and wireless power modules
• Sensor signal conditioning (proximity sensors, filtering)
• Robotics control and high-speed control electronics
• PLC boards, RF communication, filtering and timing circuits
• Motor drivers, conveyors and sorting systems in automation
• Industrial test and measurement equipment requiring low distortion

Advantages & Disadvantages

• Advantages: linear inductance without core saturation, absence of ferromagnetic core losses, improved Q and efficiency at higher frequencies, compact high-density multi-layer design; suitable designs can operate up to ~1 GHz.
• Disadvantages: achieving high inductance without a permeable core may require more turns or larger size (increasing interwinding capacitance and copper loss); higher stray-field radiation compared with cored inductors may require screening or strategic placement.

Product Datasheet (construction)
Item: Winding wire — Enameled copper wire
Wire diameter: Custom (AWG options available)
Winding type: Multi-layer round or sectional winding
Core material: Air (non-magnetic)
Bobbin: Optional plastic or ceramic
Encapsulation: Optional varnish, epoxy or coating
Mounting: Through-hole / Custom

Electrical Specifications (typical)
Inductance range: 0.1 µH – 100 µH (customizable)
Inductance tolerance: ±2%, ±5%, ±10%
DC resistance (DCR): Depends on wire diameter and turns (customizable)
Q factor: High, optimized for the target frequency range
Self-resonant frequency: High, application dependent
Operating frequency: kHz to MHz range (design dependent)
Rated current: Custom per design
Insulation resistance: ≥100 MΩ

How to Choose

• Define electrical targets: required inductance, tolerance, DCR, rated current and operating frequency.
• Specify mechanical constraints: outer diameter, height, mounting type and available PCB space.
• Assess performance needs: target Q factor, thermal dissipation, EMI/EMC requirements and signal linearity.
• Consider environment: operating temperature, vibration, humidity and duty cycle.
• Confirm customization: bobbin material, lead wire type, encapsulation and engineering support.

Characteristics / Technical specifications

• Model: WL4520
• Core: Air (non-magnetic)
• Winding: Enameled copper wire, multi-layer
• Inductance (typical range): 0.1 µH — 100 µH (customizable)
• Inductance tolerance options: ±2%, ±5%, ±10%
• Operating frequency: kHz — MHz range (suitable for RF/high-frequency circuits)
• Q factor: High, optimized per frequency range
• DC resistance: Depends on wire gauge and turns (customizable)
• Rated current: Custom per design
• Insulation resistance: ≥100 MΩ
• Mounting: Through-hole or custom
• Optional features: bobbin (plastic/ceramic), encapsulation (varnish/epoxy/coating), custom wire diameter and turns