RF inductor WL610

wire-woundairair core

Product Overview
An SMD air inductor coil is a surface-mount wire-wound inductor using air as the magnetic medium instead of a ferrite or iron core. The absence of a magnetic core eliminates magnetic saturation and core losses, providing superior high-frequency behaviour and a high Q-factor. These compact SMT components are suitable for RF circuit design, wireless communication, antenna matching and signal filtering in consumer electronics, automotive, industrial and medical applications.

Compact SMD Air Inductor Coil - Key Points
Air-core SMD inductors offer low loss at high frequency, high self-resonant frequency, no saturation and improved linearity. They come in multiple inductance values and package sizes, and can be tailored for OEM applications and automated SMT assembly.

Datasheet Summary (selected items)
Description: SMD air inductor coil — enameled copper wire
Wire diameter: 0.1 mm (AWG options available)
Winding type: Single-layer round or sectional winding
Core material: Air (non-magnetic) — copper wire conductor
Footprint length: 10–15 mm
Encapsulation: Optional varnish, epoxy or coating
Mounting: SMT / custom options

Electrical Specifications (typical)
Inductance range: 0.1 µH – 100 µH (customizable)
Inductance tolerance: ±2%, ±5%, ±10%
DC resistance (DCR): Custom (per design)
Q factor: High, optimized per frequency range
Self-resonant frequency: High, application dependent
Operating frequency: kHz to MHz range
Rated current: Defined per design (thermal-limited)
Insulation resistance: ≥100 MΩ

How it works
Current through the copper windings generates a magnetic field; because the magnetic path is air, there are no hysteresis losses or magnetic saturation associated with ferromagnetic cores. Inductive reactance increases with frequency, making these coils effective as filters, noise suppressors and impedance matching elements in RF circuits and wireless systems.

Industrial and Typical Applications
Typical applications include:

• Antenna matching networks
• Wireless modules (Bluetooth, Wi‑Fi, GPS)
• RF amplifiers, oscillators and filters
• RF transceivers and antenna systems
• Medical electronics requiring stable inductance and low distortion
• Automotive telematics and navigation units
• Industrial control systems, measuring instruments and test equipment
• Consumer electronics and IoT devices (compact SMT packaging)

Advantages

• No magnetic saturation
• No core losses — low loss at high frequency
• High Q-factor and improved linearity
• High self-resonant frequency
• Low signal distortion and good temperature stability
• Surface-mount compatibility for automated assembly

Disadvantages

• Lower inductance per volume compared with ferrite-core parts
• Larger size needed to reach equivalent inductance
• Lower energy storage — not ideal for power-storage applications
• More susceptible to external EMI if PCB layout is not optimized
• May be more costly for high-precision or high-inductance requirements

Troubleshooting — Common Issues & Remedies

• Inductance drift — Cause: mechanical deformation or temperature change. Remedy: choose parts with tighter tolerances and better temperature stability.
• Overheat — Cause: operating current above rating. Remedy: reduce current, choose lower DCR winding or higher-rated design and ensure thermal management.
• Poor signal quality — Cause: low Q or unsuitable SRF. Remedy: select higher-Q air inductors with appropriate self-resonant frequency.
• EMI interference — Cause: poor PCB layout or proximity to noisy components. Remedy: increase spacing, improve grounding and PCB layout.
• Frequency shift — Cause: parasitic capacitance or tolerance issues. Remedy: review resonance calculations and tolerances.
• Soldering defects / open circuit — Cause: improper reflow or mechanical damage. Remedy: inspect solder joints and follow recommended SMT reflow profiles; handle parts carefully.

Technical Specifications

• Model / Series: WL610
• Description: SMD air inductor coil (enameled copper wire)
• Wire diameter: 0.1 mm (AWG options available)
• Winding: Single-layer round or sectional winding
• Core: Air (non-magnetic)
• Footprint length: 10–15 mm
• Encapsulation options: Varnish, epoxy or coating (optional)
• Mounting: SMT / custom options
• Inductance range: 0.1 µH – 100 µH (customizable)
• Tolerances: ±2%, ±5%, ±10%
• Operating frequency: kHz to MHz (RF applications)
• Q factor: High (optimized per frequency)
• Self-resonant frequency: High (application dependent)
• DC resistance (DCR): Custom per design
• Rated current: Defined per design (thermal limit)
• Insulation resistance: ≥100 MΩ