Two (Double) layer MCPCB is consisting of two layers of copper conductor, put them on same side of metal core (usually aluminum, copper or iron alloy). The metal base is on the bottom of whole MCPCB.

　　Double sided MCPCB (the two copper layers were put on the each side of metal core respectively), and you can only populate SMD on top side.

　　Different from Single layer MCPCB, 2 layers MCPCB requires an additional pressing step to laminate the imaged thermal conductive laminate and metal core (also known as metal base) together.

　　The processing steps of the MCPCB with the metal base embedded in the PCB are comparatively complex as hole plugging is required after primary drilling on the metal base in order to isolate it from the circuitry.

　　Capability of 2L MCPCB

　　•Base material: Aluminum/Copper/Iron Alloy

　　•Thermal Conductivity (dielectrial layer): 1.5, 2.0, 3.0 W/m.K.

　　•Board Thickness: 0.5mm~3.0mm(0.02"~0.12")

　　•Copper thickness: 1.0 OZ, 2.0 OZ, 3.0 OZ

　　•Soldermask: White/Black/Blue/Green/Red Oil

　　•Surface finishing: Immersion Gold, HASL, OSP