160nH Broadband Inductors Fine Wire RF Choke Inductor 100MHz - 22GHz

High-Frequency Technical Summary
   The HALT25008 is a specialized, ultra-broadband Conical Inductor designed for high-performance bias-tees, RF decoupling, and broadband microwave filtering. Delivering a nominal inductance of 160 nH ± 20% and operating over an extended frequency band of 100 MHz to 22.0 GHz (with usable reference performance reaching up to 40.0 GHz), this inductor is wound with an ultra-fine 0.08 mm (80 µm) copper wire and is rated for a continuous DC current of 500 mA.

   The engineering architecture of the HALT25008 is optimized for low parasitic capacitance. By utilizing a tighter, fine-wire winding structure, this model achieves a lower starting frequency (100 MHz compared to 200 MHz on heavy-wire designs) and pushes the upper operational bandwidth to 22.0 GHz. It is highly suitable for high-speed fiber-optic optical transceivers (TOSA/ROSA), broadband test documentation, and high-frequency amplifiers.

Key Performance Advantages
   •Extended Ultra-Broadband Performance (100 MHz - 22 GHz): Provides a broader bandwidth than standard heavy-wire inductors, delivering stable RF isolation down to 100 MHz.
   •Precision Fine-Wire Winding (0.08 mm): Micro-precision winding reduces inter-turn parasitic capacitance, shifting self-resonant frequencies (SRFs) upwards for a smooth, dip-free insertion-loss curve.
   •Highly Optimized Current Density: Carries up to 500 mA of continuous DC bias despite its microscopic 0.08 mm wire size, thanks to high-purity oxygen-free copper and high-thermal-rating polyimide insulation.
   •Air-Core Saturation-Free Design: Possesses an air-core architecture that prevents magnetic saturation, maintaining absolute inductance stability across the entire current and RF power envelope.
   •Solderable Flying Leads: Features highly conductive, easy-to-weld wire leads on both the small end and large end, facilitating clean interconnect bonding on RF microstrips.

Overall Dimensions

Comprehensive Parameter Datasheet

Multi-Frequency Operational Performance Breakdown

The HALT25008 undergoes strict vector network analyzer (VNA) testing using microstrip calibration fixtures. Itsbroadband impedance and attenuation performance are categorized into three major frequency segments:

Comparative Technical Matrix (HALT25008 vs. HALT20015)

Understanding the performance difference between these two 16onH conical inductors is essential for propercircuit selection:

FAQ
Q1: Why does the HALT25008 have a broader frequency bandwidth than the HALT20015?
  A:The frequency bandwidth of a conical inductor is constrained by its parasitic parameters. Because the HALT25008 is wound with an ultra-fine 0.08 mm wire (compared to 0.15 mm on the HALT20015), the physical surface area of the winding is much smaller. This significantly reduces the inter-turn parasitic capacitance. Less parasitic capacitance shifts the self-resonant frequency (SRF) upwards, allowing the inductor to maintain a high-impedance state from a lower 100 MHz start all the way up to 22.0 GHz.

Q2: What happens if the conical inductor is not secured with epoxy?
  A:At microwave frequencies, physical stability is electrical stability. Without epoxy fixing, the air-core coil can vibrate due to environmental acoustic or mechanical resonance. These micro-vibrations change the spacing between the winding turns, causing modulation of the inductance (microphonic effect) and introducing phase noise into the RF signal. Point-epoxy stabilization is mandatory for high-reliability Strategic and telecommunication assemblies.

Q3: Can the HALT25008 be used with automated wire bonding equipment?
  A:Yes. The straight, gold-plated copper flying leads of the HALT25008 are optimized for automated thermo-compression or thermosonic wedge bonding, as well as high-precision automated micro-soldering, making it fully compatible with high-speed surface mount technology (SMT) and hybrid microcircuit assembly lines.