Polymer composite materials for electrostatic discharge protection
AssigneeLittelfuse, Inc.
InventorsHugh M. Hyatt, Louis P. Rector
Life of this patent
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Abstract
A composition for providing protection against electrical overstress (EOS) comprising an insulating binder, doped semiconductive particles, and semiconductive particles. The composite materials exhibit a high electrical resistance to normal operating voltage values, but in response to an EOS transient switch to a low electrical resistance and clamp the EOS transient voltage to a low level for the duration of the EOS transient.
Claims32
A composition for providing protection against electrical overstress, the composition comprising:
- an insulating binder;
- doped semiconductive particles comprising from about ten to about sixty percent by volume of the composition;
- and
- semiconductive particles, the doped semiconductive particles and the semiconductive particles sized and shaped to be mixed in the binder and constructed and arranged within the binder to be laminated into an electrode gap.
A composition for providing protection against electrical overstress, the composition comprising:
- an insulative binder;
- doped semiconductive particles having an average particle size of less than 10 microns;
- semiconductive particles having an average particle size of less than 5 microns;
- and
- insulative particles having an average particle size in a range of about 50 to about 200 Angstroms, the doped semiconductive particles, the semiconductive particles and the insulative particles sized and shaped to be mixed in the binder and constructed and arranged within the binder to be laminated into an electrode gap.
A composition for providing protection against electrical overstress, the composition comprising:
- an insulating binder;
- first semiconductive particles doped with a first material having a first electrical conductivity;
- and
- second semiconductive particles doped with a second material having a second electrical conductivity, the first and second doped semiconductive particles sized and shaped to be mixed in the binder and constructed and arranged within the binder to be laminated into an electrode gap.
A composition for providing protection against electrical overstress, the composition comprising:
- an insulative binder;
- conductive particles composed of an inner core and an outer shell;
- and
- semiconductive particles, the core and shell conductive particles so positioned and arranged within the binder that the composition has a non-ohmic resistance over a voltage range and exhibits a clamping voltage from about 20 volts to about 2,000 volts.
A composition for providing protection against electrical overstress, the composition comprising:
- an insulative binder;
- conductive particles composed of an inner core and an outer shell;
- and
- doped semiconductive particles comprising from about ten percent to about sixty percent by volume of the composition, the conductive particles and the doped semiconductive particles sized and shaped to be mixed in the binder and constructed and arranged within the binder to be laminated into an electrode gap.
Dependencies are inferred from the claim text.