1400nH SMD Inductor Ultra Wideband Custom Inductor 20MHz - 40GHz

High-Frequency Technical Summary
   The HALT60005 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 the highest nominal inductance in the entire catalog—1400 nH (1.4 µH) ± 20%—and operating over an unprecedented frequency spectrum of 20 MHz to 40.0 GHz, this inductor is wound with an ultra-fine 0.05 mm (50 µm) copper wire and supports a continuous DC current of 200 mA.

   In ultra-broadband systems, achieving continuous isolation from low frequencies (down to 20 MHz) to millimeter-wave bands (up to 40 GHz) normally requires cascading multiple inductors of different values, which inevitably introduces destructive parasitic resonances. The HALT60005 resolves this challenge by providing a massive 1400 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 20 MHz to 40 GHz bandwidth.

Key Performance Advantages
   Extreme Broadband Range (20 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 1400 nH (1.4 µH) 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.

Comprehensive Parameter Datasheet

Multi-Frequency Operational Performance Breakdown

The HALT60005 undergoes strict vector network analyzer (VNA) testing using microstrip calibration fixtures. Itsbroadband impedance and attenuation performance are categorized into three major frequency segments:

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.

FAQ
Q1: Why is a single 1400 nH conical inductor preferred over cascading multiple inductors?
  A:In standard bias networks, achieving broadband isolation requires cascading a large-value inductor (for low frequencies) with a small-value inductor (for high frequencies). However, the connection between them creates a parasitic LC circuit, introducing a sharp resonant dip (transmission drop) in the microwave band. The HALT60005 combines an exceptionally high 1400 nH inductance with a tapered conical architecture, achieving continuous, resonance-free isolation from 20 MHz to 40 GHz in a single component.

Q2: Is the 0.05 mm wire durable enough for Strategic-grade high-vibration environments?
  A:While a 0.05 mm wire is extremely delicate, the low mass of the air-core conical coil actually reduces its susceptibility to mechanical shock. When properly secured with a micro-dot of low-outgassing epoxy on the side of the winding, the assembly easily passes Strategic-grade vibration and mechanical shock tests (MIL-STD-202, Method 204 & 213).

Q3: Why is the upper frequency limit of the HALT60005 rated at 40 GHz?
  A:The 40 GHz rating is achieved through advanced micro-wire manufacturing. By reducing the wire diameter to 0.05 mm, the capacitive coupling between winding turns is kept to an absolute minimum. This allows the inductor to maintain its inductive high-impedance state without entering parallel resonance, ensuring continuous shielding all the way up to 40.0 GHz.

Test Data