Aluminum core
A cost-effective insulated metal substrate for LED, power conversion and general thermal management.
PCB technology / Insulated metal substrate
Metal Core PCB Manufacturing (Aluminum PCB)
Metal core PCB manufacturing uses an aluminum or copper-backed thermal path to move heat away from power and lighting components through a controlled dielectric system. Aluminum PCB is commonly evaluated for LED lighting, power conversion, motor control and other assemblies where heat must move into a chassis or heatsink.
Aluminum / copperCore options
Up to 3.0 W/m·KThermal conductivity
1–4 circuitsTypical construction
DFM verifiedThermal stack
Engineering choices
Start with the heat path, then select the substrate.
An IMS board only improves thermal performance when the component interface, dielectric, metal base and final heatsink connection work as one path.
Copper core
Greater thermal spreading and mechanical mass where the application justifies added material cost and weight.
Single-layer IMS
Copper circuitry over thermally conductive dielectric and a metal base—the shortest standard thermal path.
Multilayer IMS
Additional routing and reference layers combined with a metal-backed structure after stackup-level review.
Technical reference
Metal Core PCB Thermal Process Window
Thermal conductivity is one property, not the full result. Dielectric thickness, copper area, interface quality and the external heatsink determine the assembled thermal path.
Metal core PCB specifications
Insulated metal substrate construction reference
| Circuit layer count | 1–4 typical; advanced structures by review |
|---|---|
| Metal base | Aluminum or copper |
| Thermal dielectric | Ceramic-filled electrically insulating layer |
| Thermal conductivity | Up to 3.0 W/m·K for qualified aluminum materials |
| Copper weight | 1–4 oz typical; heavier copper by evaluation |
| Finished thickness | Defined from copper, dielectric and metal-base stack |
| Surface finish | ENIG, OSP or lead-free HASL as the assembly requires |
| Profile processing | Routing, scoring and mechanical features by drawing |
| Testing | Electrical test plus dimensional and visual inspection as specified |
Capability values are design-dependent. Material, copper weight, layer count, via structure, finished thickness and surface finish can change the achievable combination.
Design context
Dielectric selection balances heat transfer and isolation.
A thinner or more conductive dielectric can reduce thermal resistance, but electrical withstand, copper geometry and process robustness still govern the acceptable construction.
- Define component heat load and the intended heat-sink interface
- Select thermal conductivity and dielectric thickness together
- Review isolation voltage and creepage requirements against the product standard
- Use copper spreading areas and thermal vias only where the stackup supports them
- Control flatness, mounting holes and interface material around the final mechanical assembly
Aluminum coreCopper coreIMSAluminum PCBInsulated Metal Substrate (IMS)Thermal dielectric1–3 W/m·KLED PCBPower PCBENIGOSP
Engineering review
Validate the complete thermal path before production release.
Review dielectric thickness, thermal conductivity, copper spreading, isolation and the external heatsink interface together.
Power-loss and heat-source map against the proposed thermal path
Metal type, base thickness and dielectric thermal conductivity
Electrical isolation and creepage or clearance requirements
Copper weight, spreading area and local current density
Board flatness, profile and mounting interface
Surface finish, soldering profile and final inspection plan
Practical fit
Where a metal-backed thermal path earns its place
Use these examples as a starting point. The board construction still follows the product’s electrical, mechanical and qualification requirements.
LED lighting
High-brightness lighting modules that must move heat away from LED junctions.
Power conversion
Power supplies, inverters and converter stages with concentrated thermal loads.
Automotive lighting
Headlamp, signal and interior-lighting modules with temperature and reliability constraints.
Motor control
Power-device mounting and control assemblies requiring a compact heat path.
Industrial power
Controls and power electronics installed against a chassis or heat spreader.
Charging systems
Power modules where electrical isolation and thermal transfer must be designed together.
Frequently asked questions
Metal core PCB manufacturing FAQ
These answers clarify the material, thermal and fabrication decisions behind a metal core PCB build.
What is a metal core PCB?
A metal core PCB uses a metal base—commonly aluminum or copper—under an electrically insulating, thermally conductive dielectric and the copper circuit. It is designed to move heat into the mechanical assembly more directly than standard FR-4.
What is the difference between a metal core PCB and an aluminum PCB?
A metal core PCB is the broader construction family: it uses a metal base, commonly aluminum or copper, under an electrically insulating, thermally conductive dielectric. An aluminum PCB is the common aluminum-base option; copper core is selected when greater heat spreading or thermal mass justifies additional cost and weight.
What thermal conductivity is available?
Qualified aluminum material systems are available up to 3.0 W/m·K. Final thermal performance also depends on dielectric thickness, copper coverage, interfaces and the external heatsink.
Can metal core PCB be multilayer?
Yes, multilayer insulated-metal constructions can be evaluated. They require a stackup-specific review because routing layers, isolation, lamination and the metal-backed thermal path interact.
Related PCB pages
Compare related PCB technologies and manufacturing services.
Compare metal core with heavy copper, rigid FR-4, capability limits and DFM review before selecting a thermal route.
PCB technology
Heavy Copper PCB
Heavy copper PCB manufacturing supports higher-current circuits through controlled copper weight, current density, reinforced vias and thermal design.PCB technologyRigid PCB (FR4)
Rigid PCB manufacturing provides a stable platform for fixed mechanical assemblies, from single-sided circuits to controlled-impedance multilayer boards.Manufacturing servicePCB Capabilities
PCB manufacturing capabilities vary by material, copper weight, layer count, via structure and finished thickness. Use the applicable process window rather than combining isolated maximum values.Manufacturing servicePCB DFM Review Service
PCB DFM review identifies fabrication, assembly and file-package risks before tooling or production release, with findings tied to the intended manufacturing process.Have a board in mind? Let’s define the right build path.
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