Custom Conical Inductor Ultrasonic Cleaning Proof Ruggedized Structural Matrix Dynamic Prototyping Hand Tunable Pitch

HACC-CUSTOM-UP: Ultrasonic-Proof Ruggedized Conical Inductor with Dynamic Hand-Tunable Prototyping & CTE Matching

Ultrasonic Cleaning Proof / Ruggedized Structural Matrix

RF module assembly processes — particularly for high-reliability applications — include aggressive cleaning steps: 40 kHz ultrasonic baths at 60°C in IPA, deionized water, or aqueous flux removers. Standard conical inductors with minimal structural support experience winding deformation, wire breakage, and inductance shift during ultrasonic cleaning. The HACC-CUSTOM-UP solves this with a full structural epoxy matrix that encapsulates the entire conical winding. The matrix withstands >5 N compression force and eliminates wire movement under 10 g vibration. After 10 consecutive 5-minute ultrasonic cleaning cycles at 40 kHz / 60°C, inductance shift is maintained below 2%, DCR shift below 2%, and wire bond pull strength remains above 3.0 g. The epoxy is formulated with Tg above 150°C and CTE matched to the customer's substrate — ensuring the matrix does not crack or debond during thermal cycling.

Dynamic Prototyping with Hand-Tunable Pitch Margins

RF prototype development is an iterative process: simulated inductance values rarely match the final required value after parasitic extraction and EM simulation. Traditional conical inductors are fixed-geometry — the prototype value is what it is. The HACC-CUSTOM-UP changes this with hand-tunable pitch: during the prototype stage, the winding pitch is accessible and can be manually adjusted with a 0.1 mm per turn resolution, providing ±15% inductance trim range without rewinding. The pitch adjustment process is straightforward: spread or compress turns using precision tweezers under a microscope, verify the inductance shift on a VNA, then lock the pitch in seconds with UV-cure tack adhesive. Once the optimal pitch is found, full epoxy cure locks the winding permanently — with no inductance shift during the cure cycle. This enables a single prototype inductor to cover a 30% inductance range, dramatically reducing prototype iteration cycles.

Zero-Thermal-Stress CTE Matching

The structural epoxy matrix is formulated for CTE matching to the customer's substrate — alumina (6.7 ppm/°C), AlN (4.5 ppm/°C), or custom — with a ΔCTE below ±1.5 ppm/°C. This prevents matrix-to-substrate stress during thermal cycling. After 1,000 cycles from -55°C to +125°C, inductance shift remains below 2%, structural matrix integrity is maintained, and no debonding or cracking is observed.

Key Specifications

Applications

• RF Module Assembly with Ultrasonic Cleaning — 10-cycle survival, <2% inductance shift, ruggedized epoxy matrix for high-yield production cleaning
• Rapid RF Prototyping — Hand-tunable ±15% inductance, VNA-verified pitch adjustment, UV-lock <30 seconds per iteration
• High-Reliability Hybrid Production — Structural matrix >5N compression, 10 g vibration qualified, CTE-matched for thermal cycling reliability
• Multi-Project Prototype Runs — Single inductor covers 30% inductance range, eliminates multiple fixed-value prototype orders

Contact us with your inductance range, cleaning process, and substrate requirements. Ultrasonic-proof ruggedized conical inductors with hand-tunable prototyping ship in 5–7 business days.