The 2+N+2 HDI PCB Stackup delivers the advanced architecture required for next-generation, high-density digital designs. By utilizing a dual-layer sequential build-up (SBU) process, this board integrates two layers of laser-drilled microvias on both the top and bottom surfaces of a central core ($N$ layers). This specific layout dramatically increases routing density, allowing hardware developers to successfully route ultra-fine pitch BGAs down to 0.4 mm while reducing overall layer count and minimizing signal attenuation.

Key Features of 2+N+2 HDI PCB Technology

• Dual-Layer Microvias: Supports stacked, staggered, skip, and copper-filled via-in-pad structures for maximum routing efficiency.

• Controlled Impedance: Advanced dielectric materials and tight manufacturing tolerances ensure stable differential and single-ended signaling.

• Fine Line and Space: Capable of trace widths and spacing down to 3 mil ($75\mu \text{m}$) for high-speed routing.

• Premium Substrates: Available in high-Tg​ FR-4, halogen-free, and low-loss materials to maintain thermal and structural stability.

• Surface Finishes: ENIG, ENEPIG, or OSP options available to ensure excellent solderability and reliable component joints.

Applications

• Telecommunications: High-speed routers, 5G wireless network infrastructure, and RF switching equipment.

• Computing and Storage: Compact single-board computers (SBCs), high-performance servers, and memory modules.

• Consumer Electronics: Premium smartphones, wearable technology, and ultra-thin IoT devices.

• Industrial Automation: High-reliability control units, advanced sensor hubs, and robotics modules.

Why Choose PCBSYNC

PCBSYNC is a professional PCB fabrication, PCBA, and EMS manufacturer delivering precision-built electronics for aerospace, medical, automotive, industrial, and smart energy applications. We handle everything from rapid prototyping to mass production — including rigid, flexible, and rigid-flex PCBs, full turnkey assembly, component sourcing, AOI and X-ray inspection, and OEM/ODM support. Reliable boards. Consistent quality. From prototype to production — PCBSYNC.

Ready to take your high-density interconnect design from layout to reality? Contact the engineering team at PCBSYNC today to discuss your technical specifications or to submit your Gerber files for a detailed quote.