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

A positive temperature coefficient thermistor device, comprising:

• a bottom electrode including a first unit and a second unit;
• a first isolation trench disposed between said first unit and said second unit of said bottom electrode;
• a first insulating layer disposed on said first unit and said second unit of said bottom electrode;
• a first metal layer disposed on said first insulating layer;
• a first conductivity composite material layer having PTC characteristics disposed on said first metal layer;
• a top electrode including a third and a fourth unit, disposed on said first conductivity composite material layer having PTC characteristics;
• a first conducting mechanism for conducting said first unit of said bottom electrode and said third unit of said top electrode;
• a second conducting mechanism for conducting said second unit of said bottom electrode and said fourth unit of said top electrode;
• a second metal layer and a second conductivity composite material layer having PTC characteristics are disposed between said bottom electrode and said first insulating layer wherein said second metal layer is disposed on said second conductivity composite material layer;
• and
• a third conducting unit for conducting said first metal layer and said second metal layer.

The A positive temperature coefficient thermistor device comprising:

• a first electrode including a first unit and a second unit;
• a first isolation trench disposed between said first unit and said second unit of said first electrode;
• a strengthened insulation layer disposed on said first unit and said second unit of said first electrode;
• a first metal layer disposed on said first insulating layer;
• a first conductivity composite material layer having PTC characteristics disposed on said first metal layer;
• a second electrode including a third and a fourth unit, disposed on said first conductivity composite material layer having PTC characteristics;
• a first conducting mechanism for conducting said first unit of said first electrode and said third unit of said second electrode;
• and
• a second conducting unit for conducting said second unit of said first electrode and said fourth unit of said second electrode,
• wherein a first composite electroplated layer containing carbon black and metal is disposed between said first metal layer and said first conductivity composite material layer having PTC characteristics.