Over-Current Protection Device

An over-current protection device, comprising:

• a resistance material having positive or negative temperature coefficient characteristic, including opposite upper and lower surfaces;
• a first electrode layer disposed on the upper surface, including a first groove dividing the first electrode layer into two connected regions;
• a first surface mount pad formed on the upper surface;
• a second groove electrically separating the first surface mount pad from the first electrode layer;
• a second electrode layer formed on the lower surface, electrically connecting to the first surface mount pad, wherein the first and second electrode layers hold a portion of the resistance material between them;
• a second surface mount pad formed on the lower surface, electrically connecting to the first electrode layer;
• and
• a third groove electrically separating the second electrode layer from the second surface mount pad;
• wherein the first and second surface mount pads are separated from each other in a direction parallel to the upper surface and one end of the first groove connects to the second groove, whereas another end of the first groove is above the third groove.