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4 Layer HDI PCB Manufacturing Insights

These boards deliver high routing density through laser-drilled microvias and sequential lamination while maintaining controlled production costs.

Typical Specification Range

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Parameter Typical Range
Layer count4 layers
Material typeFR-4, High Tg FR-4
Surface finishENIG, OSP, Immersion Tin
Thickness0.4mm to 3.2mm
Solder maskGreen, black, red, white, yellow, blue, purple
Copper thickness0.5oz to 2oz
Special featuresBlind microvias, stacked vias, fine pitch lines

Manufacturing Process Insights

Sequential Lamination: Inner core is laminated first. Outer layers add through controlled press cycles with prepreg.

Laser Drilling: UV and CO2 lasers create microvias. Plasma desmear follows to clean via walls.

Plating Logic: Direct metallization and electrolytic copper fill microvias uniformly. Current density is tightly controlled.

Surface Finish: ENIG is preferred for fine pitch assembly reliability.

Registration control and via inspection mitigate risks throughout the process.

Manufacturing Order Profile

Order Quantity Order Proportion Estimated Price Level Typical Lead Time
Prototype (<=30 pcs) 69% From $180 From 7 days
Small volume (30-200 pcs) 22% From $220 From 8 days
Mass production (>200 pcs) 9% From $330 From 8 days

Manufacturing Challenges & Process Optimization

Microvia Plating Voids
4 layer HDI boards often show plating voids in laser drilled microvias during volume runs.
Laser residue and high aspect ratios limit copper throw in electrolytic plating.
Voids create high resistance paths that fail under thermal cycling. This lowers first pass yield and long-term reliability.

Optimize laser parameters and desmear process.
Combine plasma and chemical desmear. Maintain strict plating bath control.
Use cross-section analysis on production coupons.

View Exact Order Case

Lamination Registration Errors
Multiple press cycles in 4 layer HDI increase layer to layer misalignment risk.
Material CTE differences and tooling tolerance stackup drive layer shift.
Misregistration causes annular ring breakout at vias. This reduces manufacturing yield and impedance stability.

Apply compensated artwork scaling. Optimize press temperature ramp and pressure for each cycle. Use matched material sets.
Select compatible dielectrics with similar expansion behavior. Employ precision steel plates during lamination. Verify results with test panels.
Perform X-ray registration inspection on every panel. Conduct cross-section verification. Track data to refine scaling coefficients.

View Exact Order Case

Design Considerations

Stackup Design
Arrange layers to support required impedance. Balance dielectric thickness for microvia reliability. This approach maintains both electrical performance and manufacturability.
Via Strategy
Material Selection
Surface Finish
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Common Applications

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PCB Solution for Automotive Electronics

AIVON automotive electronics PCBs are designed for demanding vehicle environments. They withstand extreme temperatures, vibration, and harsh conditions, supporting ECUs, ADAS, infotainment, and EV modules. Featuring multilayer, rigid-flex, and high-frequency designs, AIVON PCBs meet IATF 16949 standards for safe and reliable automotive performance.

PCB Solution for Transportation

Ensure uncompromising safety with our automotive-grade PCBs, compliant with stringent industry standards. Engineered for EVs, ECUs, and railway signaling, our boards withstand extreme vibration and thermal shock. We deliver the rugged reliability and precision required for mission-critical transportation electronics.

View More Engineering Resources

Why Choose AIVON for 4 Layer HDI PCB?

AIVON manufactures 4 Layer HDI PCB with laser microvia drilling, sequential lamination, and fine line imaging capability, ensuring high interconnect density, precise via alignment, and stable electrical performance in high-reliability production.

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