High Q Air Core Coils 17nH Wire Wound Inductors 400mA

HALA1200503R High-Q 12-Turn Air Core Inductor | 17nH 400mA Microwave Bias Choke

High-Frequency Technical Summary
   The HALA1200503R is an ultra-precision, high-Q 12-turn micro air core inductor designed to operate under high-reliability conditions across a recommended frequency band of 2.0 GHz to 20.0 GHz. Winding a solid 0.05 mm (50 µm) high-purity copper wire around a microscopic 0.3 mm (300 µm) hollow inner diameter, this component delivers a nominal inductance of 17 nH ± 20%.

    By utilizing a robust 0.05mm wire instead of thinner alternatives, the HALA1200503R achieves a significantly lower Direct Current Resistance (DCR). This thermal optimization allows the micro-coil to handle a high continuous current of 400 mA and expand its frequency performance up to 20 GHz. This makes it an outstanding solution for DC-bias networks and impedance matching in Tactical, aerospace, and high-speed telecommunications modules.

Key Performance Capabilities
    •Extended High-Current Threshold: Rated for a continuous continuous DC current of 400 mA without risking thermal runaway or wire degradation.
    •Superior Microwave Q-Factor: The hollow, coreless physics design completely eliminates magnetic core losses, allowing the quality factor to scale linearly through 20 GHz.
    •Absolute Inductance Linearity: Maintains its 17nH inductance curve stably under fluctuating DC biases, ensuring clean S-parameters.
    •Ready-to-Assemble Leads: Features pre-stripped and pre-tinned termination leads, optimizing it for precision manual or semi-automated micro-soldering.

Comprehensive Parameter Datasheet
   •Nominal Inductance: 17 nH (±20% Tolerance)
   •Maximum Continuous Current: 400 mA (Continuous)
   •Target Frequency Spectrum: 2.0 - 20.0 GHz (Microwave Bands)
   •Helical Winding turns: 12 Turns (Precision Wound)
   •Copper Conductor Diameter: 0.05 mm (50 Microns)
   •Hollow Inner Diameter: 0.30 mm (300 Microns)
   •Lead Finish: Pre-tinned (Solder-ready preparation)
   •Winding Material: Enameled Copper (High-reliability grade)
   •Assembly Process: Micro-Soldering (Optimized for lead bonding)
   •Rated Operating Temperature: -55 to +125 °C (Industrial/Tactical/Grade)
   •Storage Environment: 20-25°C, 40%-60% RH (Cleanroom conditions)
   •Shelf Life Guarantee: 1 Year (Under Storage Conditions)

Product Dimensions

S-Parameter Engineering & Board Assembly Guide
   To prevent parasitic mutual inductance and maintain signal integrity in multi-gigahertz microstrip circuits, engineers must strictly adhere to the following physical routing and thermal parameters:

6.1 Geometric Crosstalk Shielding
   During SMT layout, the central axis of the HALA1200503R coil body must be positioned strictly perpendicular (orthogonal at 90°) to the RF microstrip signal line. Mounting the coil parallel to the transmission line causes magnetic flux coupling, introducing parasitics and degrading insertion loss.

6.2 Stub Impedance Control
   To maintain clean impedance profiles, keep the connection leads from the coil turns to the microstrip pads as short as physically possible. Excess lead length introduces parasitic series inductance, shifting the self-resonant frequency (SRF) and detuning the matching network.

6.3 Precision Solder Joint Assembly
   •Thermal Profile: For micro-soldering, the soldering tip or hot-air reflow temperature must not exceed 260°C for a maximum of 3 seconds. This strict thermal budget prevents damage to the 0.05mm enameled insulation layer.
   •Securing the Coil: After RF tuning and S-parameter verification, apply a small droplet of low-loss dielectric adhesive or epoxy to anchor the 12 turns. This secures the physical pitch against mechanical shock, vibration, and acoustical microphonics.

Portfolio Trade-off Guide (12-Turn Variant Analysis)
   To assist hardware designers in choosing the exact part, this table highlights the engineering trade-offs between Vibratac's two premier 12-turn micro air core inductors:

   •Wire Diameter: 0.05 mm (HALA1200503R) vs 0.03 mm (HALA1200303R). The 0.05mm version features a more robust copper filament with lower DC resistance.
   •Max Current Rating: 400 mA (HALA1200503R) vs 200 mA (HALA1200303R). Choose the 0.05mm model for power-amplifier DC biasing rails.
   •Nominal Inductance: 17 nH (HALA1200503R) vs 26 nH (HALA1200303R). Choose the 0.03mm model if your circuit requires maximum inductance density in a tight space.
   •Frequency Response: 2.0 - 20.0 GHz (HALA1200503R) vs 1.5 - 18.0 GHz (HALA1200303R). The 0.05mm version extends higher into K-band microwave regions.
   •Inner Diameter: Both maintain the identical ultra-compact micro-footprint of 0.3 mm.

FAQ
Q1: Why does the HALA1200503R have a lower nominal inductance (17nH) than the HALA1200303R (26nH) despite having the same 12 turns?
   A:Although both coils feature 12 turns, the HALA1200503R uses a thicker 0.05mm wire. The thicker wire physically increases the overall pitch (the spacing between the center of adjacent turns) and the volume of the coil. This physical expansion reduces the coupling coefficient between the turns, lowering the overall mutual inductance and resulting in a nominal value of 17nH.

Q2: What is the primary benefit of the 400mA current rating in RF bias networks?
   A:In active high-frequency circuits like GaN or GaAs power amplifier (PA) bias tees, the inductor must carry the DC bias current of the transistor while blocking the RF signal. Thinner wires (like 0.03mm) have high DC resistance, leading to localized heating. The thicker 0.05mm wire of the HALA1200503R lowers DCR, allowing it to handle up to 400mA of continuous bias current with minimal temperature rise, preserving overall system reliability.

Q3: What are the recommended shelf-life conditions for these inductors?
   A:To maintain the solderability of the pre-tinned leads, the components must be kept in moisture-barrier bags with desiccant under a controlled environment of 20°C to 25°C and 40% to 60% relative humidity. The shelf life under these storage conditions is 1 year from delivery.

Test Data(10MHz-20GHz)