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Metal core PCB

What is Metal core PCB ?

MCPCB is short word of metal core PCB(printed circuit boards),
A metal core PCB is a 1 or more layer PCB glued to a metal core.
The metal core is typically made of aluminum or copper.

matel core pcb

Structure of  regular one sided metal core PCB

metal core pcb

Metal Core Layer
This layer can be made out of aluminum, copper etc…
Aluminum is the most common due to its cost, weight and thermal characteristics.

Typical thickness for aluminum is 0.8mm to 3.2mm
Typical aluminum alloys used are: AL6061, AL5052, AL1001.
In some cases where heat dissipation takes priority over cost, copper is used for the metal layer.

Typically a heat sink is attached to the metal base to further dissipate heat away from the components.

Dielectric Layer

The dielectric layer is the most important layer in a MCPCB
because it must maintain electronic insulation while also being thermally conductive.
The dielectrics thickness plays an important role because
It must be thick enough so the copper circuit does not short out,
Yet thin enough to maintain high thermal performance.

Typical thickness of this layer is between 0.075mm to 0.2mm (0.003” – 0.008”).
Thermal conductivity of dielectric is between 0.8W/m.k to 10 W/m.k
Thicker or thinner layers can be used depending on voltage and current.