Metal Core PCBs (MCPCB)

A Metal Core Printed Circuit Board (MCPCB) uses a metal base layer — most commonly aluminum, sometimes copper — to pull heat away from high-power components far more efficiently than a standard FR-4 board. The metal base sits beneath a thermally conductive dielectric and a standard copper circuit layer, giving you a direct thermal path from die to heat sink.

Where MCPCBs are used

• LED lighting — high-brightness and high-power LED modules
• Power electronics — converters, inverters and motor drives
• Automotive — headlights, power modules and EV systems
• Industrial — power supplies and automation controls
• Consumer — power adapters and high-power devices
• Telecom — RF power amplifiers

Key benefits over standard FR-4

• Superior thermal management — lowers junction temperatures, extends component life and improves reliability.
• High power handling — designed for circuits with high current and power density that would damage FR-4.
• Mechanical stability — the metal base resists warping and survives vibration and thermal cycling.
• Compact designs — better heat dissipation lets you increase power density and shrink or eliminate external heatsinks.
• Higher LED density — designers can pack more LEDs per board because of the improved thermal path.

Basic MCPCB structure

Single-sided, double-sided and multilayer MCPCBs

MCPCBs are most commonly single-sided, but they don't have to be. As applications get more demanding we build several variants:

• Single-sided MCPCB — one copper layer over dielectric over the metal base. The standard for LED lighting and simple power circuits.
• Double-sided MCPCB — copper on both faces with the metal base bonded underneath as a heat spreader, or a metal core sandwiched between copper layers.
• Multilayer MCPCB — full multilayer stackups bonded to (or built around) a metal base for designs that need both routing density and aggressive thermal performance.

Example: double-sided aluminum MCPCB stackup

Two-layer circuit, 35 µm copper each side, 1.6 mm finished thickness (drawing by Andy):

Total thickness: 1.60 mm · Tolerance: ±10% · Max 1.76 mm · Min 1.44 mm.

MCPCBs with pedestals

A newer substrate option mills the thin dielectric down to the bare metal base directly under the LED, letting the LED's thermal pad sit on a pedestal that contacts the heat sink with no dielectric in between. The result is an LED operating temperature drop of roughly 30 to 50 °C — a major reliability and lifetime improvement that's been adopted across the lighting industry.

Common materials

• Aluminum core — cost-effective, lightweight, the default choice for LEDs.
• Copper core — significantly higher thermal conductivity for the most demanding applications.
• Thermal dielectric — engineered epoxies or ceramic-filled systems; selection drives overall thermal performance.
• Copper foils — standard or heavy copper (3 oz to 10 oz+) for high-current designs, often combined with the metal core.

Manufacturing process

MCPCBs require specialized processing to protect the thin thermal dielectric while still delivering reliable copper circuitry. Our standard MCPCB flow:

• Metal base preparation
• Dielectric lamination
• Copper circuit imaging and etching
• Precision drilling and routing of the metal base
• Surface finish application
• Solder mask (where applicable)
• Electrical test and inspection

The hardest step is machining and drilling the aluminum or copper without tearing or distorting the very thin dielectric. Aluminum boards take roughly 10×longer to machine than standard FR-4, and copper-core boards up to 15× — one of the main cost drivers along with the proprietary thermal dielectric itself.

Design considerations

Thermal path optimization

• Minimize thermal resistance from component to metal core
• Use large copper areas and thermal vias where appropriate

Dielectric selection

• Balance thermal conductivity with electrical insulation
• Consider breakdown voltage and operating temperature

Component placement

• Place high-power components directly over the metal core
• Optimize spacing for heat spreading

Manufacturability

Bring us in early on stackup and material selection — it shortens lead time, controls cost and avoids surprises in machining the metal base.

MCPCB vs. standard FR-4

MCPCBs cost more up front, but they often reduce total system cost by eliminating large external heatsinks and improving long-term reliability.