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Multilayer PCB Manufacturing

Engineering advanced 3 to 30+ layer circuit boards with controlled impedance, precision via routing, and high-frequency substrates.

Multilayer PCB Circuit Board
HIGH COMPLEXITY FABRICATION

High-Reliability Multilayer Printed Circuit Boards

A Multilayer PCB is a circuit board that has more than two conductive copper layers. Unlike Double-Sided PCBs which feature only two surface conductive layers, multilayer boards encapsulate at least three or more copper dielectric layers buried inside the core substrate.

Each substrate layer in a multilayer board has conductive metal on both sides of it and is insulated using prepreg bonding layers. Multilayer boards typically power complex electronics demanding high signal integrity, micro-via density, and compact footprints. As modern technology demands miniaturization and increased computational speed, multilayer PCBs have become the industry baseline.

Benefits of Multilayer PCBs

  • Increase in Functionality: Supports complex circuit designs within a compact overall spatial footprint.
  • High Quality & Reliability: Precision lamination techniques prevent signal cross-talk and mechanical degradation.
  • High Capacity & Speed: Enhanced plane configurations enable low-noise power distribution and high-speed data channels.
  • Higher Assembly Density: Accommodates dense Fine-Pitch BGA and SMT surface components.
  • Simplified Construction & Reduced Weight: Replaces bulky wiring harnesses with streamlined internal trace layers.

Key Application Sectors

Consumer & Computer Electronics
Telecommunication Networks
Industrial Automation
Medical Diagnostic Devices
Defense & Military Avionics
Automotive Radar & ECUs
Aerospace Navigation
High-Speed Servers & Storage
TECHNICAL PARAMETERS

Manufacturing Capabilities & Specifications

Capability Parameter Standard Capability Advanced / High-Density (HDI)
Layer Count Range 4 to 16 Layers Up to 32+ Layers
Board Thickness Range 0.4 mm to 3.2 mm 0.2 mm to 6.0 mm
Min Trace Width / Space 4 / 4 mil (100 µm) 3 / 3 mil (75 µm)
Via Structures Through-Hole Plated Vias Blind Vias, Buried Vias, Microvias, Via-in-Pad
Controlled Impedance ±10% Tolerance ±5% Tolerance (Single & Differential Pair)
Base Materials FR-4 High Tg (170°C+) Rogers, Isola, Nelco, Taconic, Polyimide, PTFE
Surface Finishes HASL Lead-Free, OSP ENIG (Electroless Nickel Immersion Gold), ENEPIG, Immersion Silver/Tin
GOT QUESTIONS?

Frequently Asked Questions

Multilayer PCBs are fabricated by interleaving etched core inner layers with sheets of resin-impregnated fiberglass (Prepreg). These materials are subjected to high temperature and pressure in a hydraulic lamination press, bonding the substrate layers together into a unified solid circuit panel.

Controlled impedance ensures signal integrity across high-speed digital traces by maintaining constant electrical resistance along transmission lines. In multilayer PCBs, trace geometry, copper weight, dielectric thickness, and substrate material parameters are carefully calculated to prevent signal reflections and data degradation.

Yes, AS&R Circuits provides quick-turn prototyping services alongside full-scale volume manufacturing[cite: 13, 14]. Our production facilities handle quick-turn deliveries for prototype testing through to full-volume production runs[cite: 13, 14].
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