Rapid Prototyping Air Wound Inductor Zero Magnetostriction Custom Inductor 20T

HALA2000303R 48nH 20T Air Core Inductor Zero Magnetostriction Silent SMD Tape Reel Rapid Prototyping RF Coil

Zero Magnetostriction: Why Coreless Means Silent

Place your finger on a ferrite-core inductor handling 1W of RF power at 2GHz. You won't feel anything — the vibration is ultrasonic, at twice the carrier frequency. But the vibration is real, measurable, and coupled directly into the PCB substrate through the ferrite's mechanical contact with the board. Ferrite magnetostriction — the physical expansion and contraction of the core material under an alternating magnetic field — converts electrical power into mechanical vibration with coupling efficiencies of parts-per-million. At gigahertz frequencies, the vibration modulates parasitic capacitance and inductance at the RF rate, creating phase noise sidebands and introducing microphonic feedback that degrades receiver sensitivity and transmitter spectral purity.

The HALA2000303R 48nH ±20% 20-turn air core inductor is physically incapable of magnetostriction. With an air core containing zero magnetic material — no ferrite, no iron powder, no nickel-zinc compound — there is simply nothing to magnetostrict. The copper wire is diamagnetic (χ ≈ -10⁻⁵, weakly repelled by magnetic fields) and experiences negligible magnetostrictive strain at any practical current or frequency. The result is an inductor that produces zero acoustic noise at DC bias, zero ultrasonic tone at the RF carrier, and zero microphonic modulation of S-parameters under external vibration.

This acoustic silence delivers measurable system-level benefits:

• No magnetostriction-induced phase noise: Phase noise sidebands from ferrite-core inductor vibration can be 10-15dB higher than the intrinsic phase noise floor of the active devices in the signal chain. Eliminating this noise source preserves the phase noise performance of premium GaAs and GaN components.
• No microphonic feedback: In fan-cooled base stations, automotive radar modules, and drone-mounted RF payloads, external vibration couples into ferrite-core inductors and amplitude-modulates the RF signal. The air core's zero magnetostriction eliminates this coupling path entirely.
• No resonant acoustic tones: Ferrite cores have mechanical resonant frequencies in the 100kHz-10MHz range that can be excited by harmonics of the RF carrier. The air core has no mechanical resonance — the copper helix's first mechanical mode is above 50kHz and is damped by the enamel coating.

SMD Tape & Reel Packaging: From Prototype to Production Without Redesign

The traditional barrier between air-core inductor prototyping and production is packaging. Hand-soldered leaded components are acceptable for 10-20 units of prototype verification, but they are incompatible with the automated SMT lines that assemble production quantities. Changing the inductor package between prototype and production phases introduces layout changes, parasitic variations, and requalification burden — undermining the purpose of prototyping.

The HALA2000303R is available in SMD tape-and-reel packaging from the first prototype order. This is significant because it eliminates the most common prototype-to-production disconnect: inductor packaging. When the prototype inductor is hand-soldered and the production inductor is tape-and-reel reflowed, parasitic differences between the two assembly methods can shift S-parameters by 0.3-0.5dB at 18GHz — enough to fail a production acceptance test. By shipping the same tape-and-reel packaged part from prototype through production, the HALA2000303R ensures measured bench performance is production performance. Each 7-inch reel holds 1,000 pieces in embossed carrier tape per EIA-481-D standard, with 4mm pitch between components. The flat-top coplanar lead design ensures both leads contact the PCB pads simultaneously during automated placement, achieving >99.9% first-pass pick-up reliability — on par with 0402 SMD chip components.

• Carrier tape: Conductive polystyrene, 8mm width, 4mm component pitch, per EIA-481-D. Pocket dimensions accommodate the coil body with 0.2mm lateral clearance to prevent carrier-tape contact stress on the 30µm wire.
• Cover tape: Heat-activated adhesive, peel force 30-80g per EIA-481. Peel force verified on 100% of reels to ensure consistent feeder performance without disturbing components in adjacent pockets.
• Reel: 7-inch (178mm) diameter, 1,000 pcs/reel standard. 13-inch (330mm) reels with 5,000 pcs available for high-volume production lines. All reels include a moisture indicator card and desiccant pack.
• Moisture Sensitivity: MSL 1 (J-STD-020, unlimited floor life at ≤30°C/85%RH) — the enameled copper and polyurethane insulation system do not absorb moisture. No dry-pack storage or baking is required. This is fundamentally different from plastic-encapsulated SMD inductors (typically MSL 2-3) that require 48-hour floor-life management and periodic baking.
• SMT Compatibility: Standard 0402 chip shooter nozzles, no custom tooling. The flat-top lead configuration presents a stable vacuum pick-up surface. Placement force ≤2N to prevent deformation of the 0.03mm wire — this is approximately half the force used for ceramic SMD components but is within the programmable range of all modern chip shooters.

Using the same tape-and-reel packaged inductor from prototype through production eliminates the most common source of prototype-to-production mismatch: the inductor itself. The S-parameters measured on the first prototype board are the S-parameters you will measure on production unit #10,000 — same part, same package, same performance.

72-Hour Rapid Prototyping & Flexible MOQ

Engineering schedules do not wait for component lead times. When a design review on Friday identifies the need for a 48nH bias choke with zero hysteresis loss, waiting two weeks for samples can stall the entire project. The HALA2000303R rapid prototyping service ships evaluation quantities within 72 hours (3 business days) of order confirmation, with flexible minimum order quantities starting at 10 pieces — ideal for initial bench verification before committing to production volumes.

Prototyping deliverables:

• 10-100 piece evaluation kit: SMD tape-and-reel format, ready for automated placement or manual evaluation. Each kit includes a datasheet, handling guidelines, and S2P Touchstone data (10MHz-18GHz) measured from representative samples from the shipped lot.
• Custom inductance binning: Within the ±20% tolerance, tighter bins (±10%, ±5%) are available on request for the prototyping quantity — useful for applications requiring close channel-to-channel matching in multi-element designs.
• Application note package: Includes recommended PCB footprint (coplanar waveguide-compatible), micro-soldering thermal profile (≤260°C, ≤3s), adhesive selection guide (H20E and alternatives), and S-parameter reference plots with equivalent circuit model for simulation.

Flexible MOQ means exactly that: 10 pieces for initial evaluation, scaling through 100, 1,000, or 10,000+ pieces for production. No minimum volume threshold triggers a package change or process change — the same precision automated winding, the same in-line machine vision inspection, and the same SMD tape-and-reel packaging serve every order size. This continuity ensures that performance measured on the 10-piece evaluation lot is identical to performance delivered on the 10,000-piece production lot.

Key Specifications

High-Volume SMD Assembly Guidelines

• Placement: Flat-top coplanar leads, standard 0402 chip shooter nozzles. Placement force ≤2N. Vision system alignment on coil body centroid.
• Orientation: Coil axis at 90° to RF signal trace. Flat-top lead geometry naturally achieves this alignment — no manual adjustment required post-placement.
• Reflow Profile: SAC305: 60-90s above 217°C, peak 245-250°C. The 0.03mm wire reaches peak temperature rapidly due to low thermal mass — dwell at peak ≤3s to prevent enamel degradation.
• Post-Reflow Inspection: AOI verifies perpendicular orientation and lead coplanarity. 20* magnification confirms solder fillet integrity on both leads and absence of bridging between turns.
• Fixation: Micro-droplet of low-dielectric adhesive (Epotek H20E gel, εᵣ <3.0) applied after reflow and in-circuit test. Secures the 20-turn helix against vibration and thermal cycling for the equipment lifetime.

Applications

• Phased-Array Beamformer T/R Modules: Zero magnetostriction eliminates microphonic coupling from cooling fan vibration in multi-hundred-element arrays. Tape-and-reel packaging enables fully automated assembly at production scale.
• 5G mMIMO Base Station Bias Tees: 72-hour prototyping allows same-week design iteration. SMD packaging and 48nH inductance support 1-18GHz wideband small-cell designs with automated assembly from prototype through production.
• Satellite Communications Payloads: Radiation-immune air-core construction with zero magnetostriction. Tape-and-reel packaging supports the build volume of LEO constellation manufacturing lines.
• Automated Test Equipment (ATE) Front-Ends: Linear, hysteresis-free B-H response ensures measurement accuracy. SMD packaging enables cost-effective automated assembly of multi-channel ATE signal conditioning modules.
• Portable Spectrum Monitoring: Acoustically silent operation eliminates microphonic artifacts from handling and transport vibration. 72-hour rapid prototyping supports field-deployment schedules with evaluation quantities available in 3 business days.

Contact us for rapid prototyping samples (72-hour shipment), production-volume tape-and-reel orders, S2P Touchstone characterization data, and automated assembly compatibility testing on your specific SMT placement platform.