Substrate Core: Thickness 0.2mm - 3.2mm

Component Specifications

Definition

A substrate core is the foundational insulating layer in multilayer printed circuit boards (PCBs), typically composed of dielectric materials like FR-4 epoxy laminate, polyimide, or ceramic. It serves as the mechanical backbone that supports embedded components (e.g., resistors, capacitors, ICs) and conductive traces, ensuring electrical isolation between layers while maintaining thermal stability and dimensional integrity during manufacturing and operation.

Working Principle

The substrate core functions by providing a rigid, non-conductive base that isolates electrical pathways and components. It distributes heat from embedded components, prevents short circuits, and maintains signal integrity by minimizing electromagnetic interference. Its dielectric properties control impedance in high-frequency applications.

Materials

FR-4 glass epoxy (most common), polyimide (for high-temperature applications), ceramic (for high-frequency/RF), PTFE (Teflon), or metal-core (aluminum) for thermal management. Thickness ranges from 0.2mm to 3.2mm, with dielectric constants (Dk) from 2.5 to 4.5.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	0.2mm - 3.2mm
Copper Cladding	0.5oz - 2oz
Flammability Rating	UL94 V-0
Thermal Conductivity	0.2 - 3.0 W/mK
Dielectric Constant (Dk)	2.5 - 4.5
Glass Transition Temp (Tg)	130°C - 250°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, IPC-4101, IEC 61249-2, UL 746E

Parent Products

This component is used in the following industrial products

Embedded Components PCB

A printed circuit board with electronic components embedded within its substrate layers rather than mounted on the surface.

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Engineering Analysis

Risks & Mitigation

Delamination under thermal stress
Dielectric breakdown at high voltages
Dimensional instability causing misalignment
Moisture absorption affecting electrical properties

FMEA Triads

Trigger: Inadequate thermal management during operation
Failure: Core delamination or cracking
Mitigation: Use high-Tg materials, implement thermal vias, and ensure proper heat sinking

Trigger: Moisture ingress during storage or assembly
Failure: Reduced insulation resistance and potential short circuits
Mitigation: Store in controlled humidity, pre-bake before assembly, and use moisture-resistant materials

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±10% for dielectric constant, ±0.05mm for thickness

Test Method

IPC-TM-650 for electrical and mechanical properties, thermal cycling per JEDEC JESD22-A104

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Substrate Core

Manufacturer profiles associated with Substrate Core.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between substrate core and prepreg in PCBs?

The substrate core is a rigid, cured dielectric layer that provides structural support, while prepreg is a semi-cured adhesive layer used to bond multiple cores together during lamination.

How does substrate core material affect PCB performance?

Material choice impacts thermal management, signal integrity, and mechanical stability. For example, polyimide cores handle higher temperatures, while ceramic cores offer better high-frequency performance.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Substrate Core