Importance

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Abstract

A surface mountable PTC chip comprising a cuboidal body having opposite ends or end surfaces and formed by at least two conductive PTC polymer sheets and top and bottom and at least one intermediate conductive metal foil interlacing with the polymer sheets to form a multi-layered structure. Each top/bottom metal foil is divided by a gap to form a pair of larger and smaller electrodes at opposite positions as compared between top and the bottom body surfaces. The intermediate metal foil extends from one body end surface and reaches short of the opposite end surface to permit integral inter-connection of the polymer sheets. A pair of electrical terminals are located at respective opposite body ends, each of which covers the entire respective body end surface and covers and is in electrical contact with adjoining portions of the larger and smaller electrodes on the top and bottom body surfaces. One terminal is in electrical contact with an end of the intermediate metal foil extending from the same body end exposed on that end surface. Each body end has a recessed surface profile formed by a recess, and the corresponding terminal assumes the same profile. Each terminal may be in the form of a cap covering the respective body end surface and the adjoining portions of all four side surfaces of the body surrounding that body end.

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First Claim