Surface mount device with foldback switching overvoltage protection feature
AssigneeElectromer Corporation
InventorsRichard K. Childers, John H. Bunch
Life of this patent
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Abstract
A nonlinear resistive surface mount device for protecting against electrical overvoltage transients is disclosed which includes a pair of conductive sheets and a foldback switching material disposed between the pair of conductive sheets. This configuration serves to connect the conductive sheets by a foldback switching mechanism thereby providing predetermined resistance when the voltage between the conductive sheets exceeds a predetermined voltage.
Claims7
A transient overvoltage protection surface mount device for mounting between spaced flat conductors carried by an insulating substrate for protecting against electrical overvoltage transients between said conductors comprising:
- spaced apart conductive sheets;
- associated spaced conductors associated with said spaced apart conductive sheets;
- a foldback switching material disposed between said pair of spaced conductive sheets serving to link said pair of conductive sheets by a foldback switching mechanism when the voltage between said conductive plates exceeds a predetermined voltage;
- means for connecting each of said sheets to an associated space conductor;
- and
- wherein said foldback switching material is a matrix formed of only homogeneously distributed, conductive particles, said particles having a particle size in the range of between greater than 10 microns to two hundred microns and having a spacing between said particles in the range of at least of 1000 angstroms to provide said foldback switching mechanism therebetween;
- and a binder selected to provide a foldback media and predetermined resistance between said conductive particles.
Dependencies are inferred from the claim text.