Ultra-Fine Line HDI PCB Capability for Dense High-Speed Routing

2026-03-27

Ultra-fine line capability is no longer just a lithography topic. It depends on imaging resolution, copper thickness, etching control, layer registration, and signal-sensitive geometry stability across the full manufacturing flow. This document explains how advanced HDI fabrication supports fine-pitch routing while controlling undercut, line edge roughness, and yield risk.

Contents

Ultra-fine line technology and routing requirements
Trace width / spacing limits and design rules
Photolithography, photoresist, and imaging precision
Etching control, undercut management, and copper adhesion
Signal integrity, impedance, crosstalk, and thermal risk
AOI, cross-section, electrical test, and DFM strategy

Tags:

#High-Speed PCB Stack

#HDI PCB Stack

#Signal Integrity (SI)

#AOI & X-ray

#Yield

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