High Precision Air Coil Inductors Micro Air Wound Coil 10 Turn

HALA1000503R High-Precision 10-Turn Micro Air Core Inductor

Product Overview & Value Proposition

    The HALA1000503R is an ultra-precision, high-frequency 10-turn micro air core inductor engineeredspecifically for high-performance RF, microwave, and millimeter-wave circuits. Operating across an ultra-broadband frequency spectrum of 3 GHz to 20 GHz, this spring coil provides exceptional Q-factorperformance, minimal insertion loss, and outstanding self-resonant frequency (SRF) characteristics.
    Manufactured with a microscopic 0.05 mm (50 um) enameled copper wire and a miniature 0.3 mm (300um) inner diameter, the HALA1o00503R represents the cutting edge of microminiaturization in passivecomponent design. It delivers a nominal inductance of 14 nH  20% and reliably handles a maximum continuous current of 400 mA under demanding thermal environments ranging from -55°C to +125°C.

    This component is the ideal solution for hardware design engineers seeking high-reliability bias chokes,impedance matching networks, and filter elements in:

     •GaN and GaAs Power Amplifier (PA) Bias Tees
     •Active Electronically Scanned Array (AESA) Radar Modules
     •High-Speed Fiber Optic Transceivers (TOSA/ROSA)
     •Tactical and Aerospace Communication Front-Ends
     •Satellite Communication (SATCOM) Terminals

Product Dimensions

Comprehensive Technical Specifications

The following table presents the verified electrical, physical, and environmental parameters for theHALA1000503R micro air core inductor.

Assembly Guidelines 

    To ensure the optimal high-frequency response of the HALA1o00503R and prevent stray parasitics or signaldegradation, Vibratac's engineering team recommends adhering to the following strict mounting andassembly guidelines:

5.1 Orientation & Spatial Alignment
     The coil body of the HALA1o00503R must be mounted strictly perpendicular to the microstrip RF signaltransmission line. Placing the coil parallel to the trace creates unwanted electromagnetic coupling andparasitic mutual inductance, which can compromise signal integrity and distort S-parameters

5.2 Lead Length Optimization
      The connecting leads from the coil to the transmission line trace must be kept as short as physicallypossible. Excess lead length introduces stray inductive paths, lowering the self-resonant frequency (SRF)and shifting the operating band of your matching network or bias tee.

5.3 Micro-Soldering Protocol
       The HALA1000503R is designed for high-precision micro-soldering and wire bonding.
       •Solder Alloy: Use low-temperature tin-lead (Sn63/Pb37) or lead-free (SAC305) solder paste.
       •Temperature Profile: The soldering iron tip or hot-air nozzle temperature must be carefully controlled,not exceeding 260°C for a maximum duration of 3 seconds. Overheating will melt or damage the ultra-thin 0.05 mm enameled insulation on the coil.
       •Flux Removal: Use a mild, non-conductive solvent (e.g., isopropyl alcohol) for post-solder cleaning.Ensure no flux residue is left between the turns.

5.4 Tuning and Dielectric Fixing
       once the RF circuit tuning and S-parameter testing (covering the 1oMHz to 20GHz spectrum) are complete and the coil is in its optimized physical shape:
        •Apply a tiny droplet of high-frequency low-loss dielectric adhesive or RF silicone/epoxy (e.g. EpoxyTechnology H20E or equivalent).
        •This encapsulates and fixes the coil's physical pitch, protecting it against mechanical vibrations, shock,and detuning during thermal cycling.

FAQ

Q1: What is the shelf life of the HALA1000503R and how should it be stored?

   A:Under optimal storage conditions-specifically at a temperature of 20°C to 25°C and a relative humidity of40% to 60%-the HALA1000503R has a guaranteed shelf life of 1 year from the date of delivery. It shouldbe kept in its original ESD and moisture-barrier packaging to prevent oxidation of the pre-tinned leads.

Q2: Why is perpendicular mounting so critical for these micro air core inductors?
   A:In RF and microwave circuit layouts, electromagnetic fields propagate along the transmission line. If thehollow inductor coil is aligned parallel to the trace, it acts as a parasitic transformer, capturingelectromagnetic energy and generating unwanted crosstalk or signal coupling. Perpendicular mounting (at90 degrees to the trace) ensures the magnetic flux of the inductor is orthogonal to the electric field of themicrostrip line, minimizing coupling and preserving the insertion loss profile.

Q3: What is the benefit of a hollow air core over a magnetic core for RF applications?
  A:Magnetic cores (like ferrite or iron powder) experience core losses (hysteresis and eddy currents) andsaturate under high current levels, which distorts high-frequency signals. A hollow air core inductor like theHALA1000503R has no core to saturate or cause losses. This yields a significantly higher Quality Factor (Q)at microwave frequencies (up to 20 GHz) and maintains absolute linearity across the entire current handlingrange (up to 400 mA).