550nH Microwave Inductor Micro Wire Wideband RF Choke 50MHz - 40GHz

High-Frequency Technical Summary
   The HALT40005 is an extraordinary, high-inductance, and ultra-broadband Conical Inductor designed for millimeter-wave RF bias networks, high-speed optoelectronics (up to 40 Gbps/100 Gbps), and high-frequency broadband bias-tees. Offering an outstanding nominal inductance of 550 nH ± 20% and operating over an unprecedented frequency spectrum of 50 MHz to 40.0 GHz, this inductor is wound with one of the thinnest wire diameters in the industry—0.05 mm (50 µm)—and supports a continuous DC current of 200 mA.

   In ultra-broadband systems, achieving continuous isolation from low frequencies (down to 50 MHz) to millimeter-wave bands (up to 40 GHz) normally requires cascading multiple inductors of different values, which inevitably introduces destructive parasitic resonances. The HALT40005 resolves this challenge by providing a high 550 nH inductance combined with a tapered conical architecture. The continuous change in winding diameter smoothly distributes parasitic capacitance, providing a flat, resonance-free high-impedance response over the entire 50 MHz to 40 GHz bandwidth.

Key Performance Advantages
   Extreme Broadband Range (50 MHz - 40 GHz): Provides continuous, flat RF shielding from low MHz up to millimeter-wave frequencies, replacing multiple cascaded inductors.
   Micro-Wire Winding (0.05 mm): Wound with ultra-fine 50 µm copper wire, enabling a high turn count to achieve 550 nH while maintaining an ultra-compact mechanical footprint.
   Eliminates Cascade Resonances: A single-component solution that suppresses signal dips and phase distortions commonly caused by multi-stage inductor biasing.
   Air-Core Saturation Protection: Prevents magnetic saturation at high power levels, ensuring absolute inductance stability and high-Q performance under varying temperatures.
   Solderable Flying Leads: Equips standard solderable gold/tin-plated copper flying leads on both small and large ends, providing easy integration onto microwave microstrips.

Overall Dimensions

Comprehensive Parameter Datasheet

Multi-Frequency Operational Performance Breakdown

The HALT40005 is tested under extreme conditions using millimeter-wave vector network analyzers and TRL de-embedding techniques:

Microwave Micro-Assembly & Installation Guide
   To preserve millimeter-wave signal integrity and prevent physical damage to the delicate copper wire, assembly operators must strictly follow this SOP:

Physical Alignment & Orientation
   Cone Tip Orientation: The small end of the conical inductor must point downward and be positioned perpendicular (≈90°) to the RF transmission microstrip line.
    Lead-Wire Length: Keep the flying lead from the small end (tip) as short as possible (ideally <0.3 mm to the microstrip). At 40 GHz, even a 0.5 mm lead wire acts as a significant parasitic inductor, introducing unwanted reflection and signal degradation.
    Physical Fixation: Conical inductors must be secured to the substrate using a small dot of non-conductive, low-outgassing epoxy (e.g., Epotek H70E or H65) on the side of the winding. This prevents resonant microphonic vibrations and mechanical failure under high-vibration environments.

Micro-Soldering and Welding SOP
    Soldering Temperature: Controlled micro-soldering tip temperature should be 280℃−320℃ for a duration of ≤2 seconds to prevent enamel degradation or melting of the ultra-fine 0.05mm copper wire.
     Lead-Free Compliance: Fully compatible with lead-free SAC305 solder and high-melting-point eutectic gold-tin (AuSn) or lead-tin (PbSn) solder alloys.

Test Data(10MHz-500MHz)