Air inductor WL 1308

air corehigh-frequencyHF

Product overview
SMD air core coil WL 1308 is a surface-mount inductor that uses air (no magnetic core) and fine enameled copper windings. Designed for high-frequency applications, it offers stable inductance, high Q-factor and minimal core-related losses. Typical uses include RF front-ends, wireless modules, IoT devices, wireless charging systems and precision medical electronics.

Main features

• Air-core design: no magnetic saturation or core-loss distortion
• High Q-factor and low DC resistance for RF/high-frequency operation
• Stable inductance values with good thermal stability
• Fine copper winding technology with selectable wire diameters and inductance values
• Compact SMD footprint compatible with automated SMT assembly
• Fast signal response and good linearity for precision RF circuits
• Customizable for OEM/ODM requirements

Compact SMD air core coil — product detail
Manufactured with precision winding techniques, WL 1308 provides low-loss performance in a small surface-mount package. The air-core magnetic path prevents saturation and improves behavior at high frequencies. Available options include multiple inductance values, wire gauges, encapsulation and package dimensions to fit PCB integration and automated placement.

Datasheet (component / mechanical)
Item — Description
SMD Air Core 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)
Footprint length — 10–15 mm
Encapsulation — Optional varnish, epoxy or coating
Mounting — Surface-mount (SMT) with custom options or through-hole as specified

Electrical specifications (typical)
Parameter — Description
Inductance range — 0.1 µH – 100 µH (customizable)
Inductance tolerance — ±2%, ±5%, ±10%
DC resistance (DCR) — Design dependent (customizable)
Q factor — High, optimized for specified frequency band
Self-resonant frequency — High, application dependent
Operating frequency — kHz to MHz range
Rated current — Specified per design
Insulation resistance — ≥100 MΩ

How it works
The coil operates by electromagnetic induction: alternating current through the copper windings generates a magnetic field in air. Without a magnetic core, the component avoids core saturation and core-losses, enabling reliable performance at higher frequencies. Inductance filters signals, assists impedance matching and stores small amounts of energy in RF circuits.

Industrial applications

• RF communication modules, antennas and RF amplifiers
• Wireless charging pads and energy transfer systems
• IoT modules, Bluetooth/Wi‑Fi/GPS and wearable electronics
• High-frequency filters, impedance matching and RF front-ends
• Medical electronics and precision sensors
• Aerospace and automotive HF subsystems (with qualification)

Advantages & disadvantages

• Advantages: no core losses, high Q, stable inductance, linear HF response and compact SMT form factor
• Disadvantages: lower inductance density vs. ferrite cores (may require larger size/turns), lower energy storage for power inductors, sensitivity to nearby magnetic fields

Troubleshooting & manufacturing notes

• Unstable inductance: check turn count, winding integrity and solder joints
• Overheating: verify rated current, wire diameter and PCB thermal design
• RF coupling: maintain spacing and orientation, optimize PCB layout to reduce mutual inductance
• Mechanical damage: protect during transport and SMT placement; use correct pick-and-place settings
• Poor soldering: ensure appropriate reflow profile, pad design and PCB cleanliness
• Incorrect selection: validate frequency response and impedance matching in prototype

How to select an SMD air core coil
Choose inductance by operating frequency and matching requirements. Consider Q factor, DCR, rated current, physical size and footprint. Verify self-resonant frequency, thermal constraints and mechanical tolerance. For OEM orders, confirm customization options, RoHS compliance, electrical testing and traceability.

Mistakes to avoid (packaging & handling)

• Insufficient mechanical protection — use foam or inner supports to prevent deformation
• Poor moisture protection — vacuum or moisture-proof bags to avoid oxidation
• Incorrect reel spacing — use standard reels for SMT pick-and-place
• No ESD protection — use antistatic packaging
• Poor labeling — include part number, inductance, quantity and batch data

Characteristics / technical specifications

• Model: WL 1308
• Core material: Air (non-magnetic)
• Conductor: Enameled copper wire
• Inductance range: 0.1 µH – 100 µH (customizable)
• Inductance tolerance: ±2%, ±5%, ±10%
• Wire diameter: typical 0.1 mm (AWG options)
• Winding type: single-layer round or sectional winding
• Footprint length: 10–15 mm (typical)
• Operating frequency: kHz to MHz
• Q factor: high (application-dependent)
• Self-resonant frequency: high (application-dependent)
• Rated current: specified per design
• Insulation resistance: ≥100 MΩ
• Encapsulation: optional varnish, epoxy or coating
• Mounting: surface-mount (SMT) with through-hole/custom options if required