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4-layer HDI first-level RF combination PCB

The 4-layer HDI first-level RF combination PCB from WellCircuits represents a pinnacle of flexible circuit engineering, designed for demanding applications requiring both high-density interconnect (HDI) and integrated radio frequency (RF) performance. As a flexible printed circuit board (FPC), it offers exceptional form factor flexibility, enabling miniaturization and dynamic movement in complex designs. Manufactured in our ISO 9001-certified facility, this product is meticulously crafted to meet stringent IPC Class 2 or Class 3 standards, making it ideal for engineers and procurement managers seeking reliable, high-performance solutions for advanced consumer electronics, automotive systems, and medical devices.

Key Specifications

WellCircuits specializes in manufacturing custom PCBs to your exact specifications. Below are typical capabilities for our 4-layer HDI first-level RF combination PCBs. Specific requirements can be discussed during the quotation process to ensure optimal performance and manufacturability.

Specification Typical Capability / Value Notes
Layer Count 4 Layers Designed for complex routing and signal integrity.
Board Type Flexible PCB (FPC) with RF integration Utilizes polyimide (PI) for flexibility; specific RF dielectrics for controlled impedance.
Base Material (Flex) Polyimide (PI) Film, Adhesive-less or Adhesiveless Copper Clad Laminate High thermal stability, excellent flexibility.
RF Dielectric Options Low-loss PI, LCP (Liquid Crystal Polymer), or specialized RF laminates (e.g., Rogers, Taconic) Selected based on frequency, Dk/Df requirements for optimal RF performance.
Board Thickness 0.15mm – 0.4mm (Finished Board) Dependent on layer stack-up and material selection.
Minimum Line Width/Spacing 2/2 mil (0.05mm) Achieved with advanced HDI manufacturing processes.
Minimum Drill Size (Mechanical) 6 mil (0.15mm) For conventional through-hole vias.
Minimum Laser Drill (Microvia) 2 mil (0.05mm) Essential for HDI and advanced interconnect density.
Aspect Ratio (Mechanical Drill) Up to 10:1 Ensures reliable plating for through-hole vias.
Aspect Ratio (Microvia) 1:1 Standard for laser-drilled microvias.
Controlled Impedance Tolerance ±5% (Standard), ±3% (High Precision) Critical for RF signal integrity, verified by TDR testing.
Surface Finish Options ENIG (Electroless Nickel Immersion Gold), ENEPIG (Electroless Nickel Electroless Palladium Immersion Gold), Immersion Silver, OSP (Organic Solderability Preservative) ENIG/ENEPIG recommended for RF and fine-pitch components.
Solder Mask / Coverlay Polyimide Coverlay, Liquid Photoimageable Solder Mask (LPI) Offers protection and defines solderable areas.
Outline Tolerance ±0.1mm (Routing), ±0.05mm (Laser Cutting) Ensures precise fit and assembly.
Copper Weight 0.5 oz – 1 oz (Outer Layers), 0.5 oz – 1 oz (Inner Layers) Customizable based on current carrying and impedance requirements.
Thermal Management Optional thermal vias, heatsink attachment pads For designs with high power dissipation.
IPC Compliance IPC Class 2 or IPC Class 3 Specify at order for desired reliability level (referencing IPC-6012 for fabrication and IPC-A-610 for assembly acceptability).
Quality Control 100% AOI (Automated Optical Inspection), 100% Electrical Test, X-ray Inspection Ensures defect-free and functional boards.

Applications

The unique combination of HDI and RF capabilities in a flexible format makes this PCB ideal for groundbreaking products across various industries:

  • Smartphones & Wearables: Enabling compact designs for 5G/6G antennas, NFC modules, and high-frequency sensors.
  • Automotive Electronics: Crucial for ADAS (Advanced Driver-Assistance Systems) radar modules, in-cabin connectivity, and flexible sensor arrays that can conform to vehicle contours, meeting AEC-Q100/Q200 standards.
  • Medical Devices: Essential for miniature diagnostic tools, flexible surgical instruments, and wearable health monitors requiring high-frequency signal processing and ergonomic integration.
  • Aerospace & Defense: For lightweight, robust communication systems, radar components, and sensor networks in space-constrained environments.
  • IoT & Smart Devices: Integrating high-frequency wireless communication (Wi-Fi 6E, mmWave) and complex data processing into smaller, more flexible form factors.
  • Telecommunications Infrastructure: Supporting next-generation network equipment, small cells, and antenna arrays where space and performance are critical.

Why Choose WellCircuits?

  • Uncompromising Quality: Our manufacturing processes are guided by an ISO 9001:2015 certified quality management system, with a defect escape rate consistently below 0.5%. Every board undergoes rigorous inspection, including 100% Automated Optical Inspection (AOI) and electrical testing, ensuring compliance with IPC-A-600 and IPC-A-610 standards for acceptability.
  • Advanced RF & HDI Expertise: We possess deep knowledge and state-of-the-art equipment for handling complex HDI structures, microvias, and precise impedance control, critical for first-level RF integration. Our engineers are proficient in IPC-2221 and IPC-2223 (for flexible circuits) design guidelines, providing valuable DFM (Design for Manufacturability) support.
  • Reliability for Demanding Environments: Offering builds compliant with IPC Class 2 for general electronics and IPC Class 3 for high-reliability applications, including those requiring automotive-grade robustness (AEC-Q100/Q200 for component-level stress testing, which influences PCB design and material selection).
  • Dedicated Support & Fast Turnaround: From initial design review to final production, our team provides expert guidance. We offer competitive lead times, with standard sample production in 3-5 working days and mass production typically within 5-15 working days, depending on complexity and volume.

Pricing & Lead Time

Due to the custom nature and advanced specifications of 4-layer HDI first-level RF combination PCBs, pricing is determined by design complexity, material selection, quantity, and specific testing requirements. WellCircuits offers competitive pricing and flexible volume options, from prototyping to high-volume mass production.

Our typical lead times are:

  • Sample Lead Time: 3-5 working days
  • Mass Production Lead Time: 5-15 working days

For an accurate quote and detailed lead time tailored to your project, please contact our sales team with your Gerber files and specifications.

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Product: 4-layer HDI first-level RF combination PCB
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