Definition

Laser microvia drilling is a precision process used to create   ultra-small vias (typically ≤100 µm) in HDI PCBs using UV or CO₂ laser   technology.

Typical Applications

Smartphones, automotive electronics, medical devices, high-speed digital   and RF circuits.

Why Quality Control Matters

Microvias directly affect electrical reliability, interconnection   integrity, and long-term PCB performance.

PCBBUY Capability

PCBBUY applies production-grade quality control standards to laser   microvia drilling for both prototype and volume manufacturing.

Inconsistent Via Diameter

Causes plating voids or impedance variation.

Excessive Resin Residue

Leads to poor copper adhesion and via failure.

Over-Drilling

Damages inner layer copper pads.

Misalignment

Results in breakout or insufficient annular ring.

Thermal Damage

Creates micro-cracks or carbonization.

Material Qualification

Controlled dielectric material selection with stable laser ablation   behavior.

Laser Parameter Optimization

Precise control of laser wavelength, pulse energy, repetition rate, and   focus depth.

Drill Depth Control

Layer-specific drilling recipes prevent inner layer copper damage.

Registration Accuracy

High-precision alignment systems ensure accurate via-to-pad positioning.

Resin Residue Removal

Dedicated desmear and plasma cleaning processes ensure clean via walls.

Optical Measurement

Verifies via diameter, roundness, and position accuracy.

Cross-Section Analysis

Confirms via shape, depth accuracy, and copper target exposure.

SEM Analysis (When Required)

Evaluates microvia wall quality and resin removal effectiveness.

Plating Adhesion Testing

Ensures strong copper-to-dielectric bonding.

Reliability Stress Testing

Validates microvia integrity under thermal and mechanical stress.

Recipe Standardization

Laser drilling programs are standardized and locked per product.

Statistical Process Control

Continuous monitoring of via diameter and depth variation.

Equipment Calibration

Regular laser system calibration ensures long-term consistency.

Process Traceability

Full traceability from drilling to plating and final inspection.

Yield Optimization

Early defect detection reduces scrap and improves production yield.

Staggered Microvias

Controlled depth and alignment between layers.

Stacked Microvias

Enhanced drilling and plating quality control to prevent fatigue   failure.

Via-in-Pad Microvias

Tight control of via geometry and copper filling processes.

HDI Any-Layer

Stable laser performance across multiple sequential lamination cycles.

Higher Reliability

Reduced risk of latent via failure in field operation.

Better Signal Integrity

Uniform via geometry supports high-speed designs.

Improved Yield

Fewer defects mean lower overall production cost.

Design Freedom

Enables advanced HDI layouts with finer pitch components.

Scalable Production

Stable processes from prototype to mass production.