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Electrical overstress protection material and process

  • US 4,726,991 A
  • Filed: 07/10/1986
  • Issued: 02/23/1988
  • Est. Priority Date: 07/10/1986
  • Status: Expired due to Term
First Claim
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1. A non-linear resistance material to provide electrical overstress protection against electrical transients, the material comprising a matrix formed of a mixture of:

  • (a) separate particles of conductive materials, the sizes of the majority of the conductive particles being less than about several hundred microns;

    (b) separate particles of semiconductor materials, the sizes of the majority of the semiconductor particles being less than about several hundred microns; and

    (c) inorganic insulating material coating the particles of conductive material and the particles of semiconductor material to provide chains of the particles within the matrix with interparticle separation distances along the chains less than about several hundred angstroms, on average, thereby permitting substantial non-linear conduction between particles in said chains by quantum-mechanical tunneling of electrons in response to electrical transients.

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