Surface mountable laminated circuit protection device and method of making the same

A method for manufacturing a surface mountable laminated circuit protection device, comprising the steps of:

• providing a double-sided metal foil clad substrate comprising a first metal layer, a first insulating layer disposed on said first metal layer and a second metal layer disposed on said first insulating layer, wherein said first metal layer and said second metal layer are conducted to each other by a plated through hole which penetrates through said first insulating layer, said first metal layer is further divided into a first unit and a second unit, and said first unit and said second unit are separated and insulated from each other;
• performing a composite electroplating process with carbon black to said second metal layer, so that a composite electroplated layer including carbon black and metal is formed on said surface of said second metal layer;
• laminating a first conductive composite material having PTC characteristics and a metal foil onto said second metal layer in sequence by a thermal laminating process for jointing said first conductive composite material having PTC characteristics and said second metal layer, wherein said metal foil is further jointed with said first conductive composite material having PTC characteristics, and a multi-layer laminated circuit structure thus is formed and said metal foil is taken as a third metal layer;
• performing an isolating process to said third metal layer for forming a third unit and a fourth unit in said third metal layer;
• and
• setting a first conducting unit for conducting said third unit of said third metal layer and said first unit of said first metal layer, and further setting a second conducting unit for conducting said fourth unit of said third metal layer and said second unit of said first metal layer.