US 6,023,028 A · Surface-mountable device having a voltage variable polgmeric material for protection against electrostatic damage to electronic components

Abstract

The thin film, circuit device is an subminiature overvoltage protection device in a surface mountable configuration for use in printed circuit board or thick film hybrid circuit technology. The surface mountable device (SMD) is designed to protect against electrostatic discharge (ESD) damage to electronic components. The circuit protection device includes three material subassemblies. The first subassembly generally includes a substrate carier, electrodes, and terminal pads for connecting the protection device 60 to a PC board. The second subassembly includes a voltage variable polymer material with non-linear characteristics, and the third subassembly includes a cover coat for protecting other elements of the circuit protection device.

Claims7

Dependent claims

A surface-mounted circuit protection device comprising:

a substrate having an upper surface;
a pair of electrodes deposited on the upper surface of the substrate separated by a gap having a gap width, wherein the gap width, at least, partially determines a voltage rating for the circuit protection device, the electrodes having one or more notches therein for preventing narrowing of the gap width;
and,
a voltage variable polymeric material deposited between the electrodes in the gap of the upper surface of the substrate for protection against electrostatic transient voltage damage to electrical components.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

08/474,940Filed 7 Jun 1995 · continuation in part

Priority

27 May 1994

Granted

8 Feb 2000

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

H01H 85/046
Characterised by the type: fuses formed as printed circuits
H01C 7/006
Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered…:…
H01C 7/1013
Voltage responsive, i.e. varistors: thin film varistors
H01C 7/12
Voltage responsive, i.e. varistors: overvoltage protection resistors; Arresters

Surface-mountable device having a voltage variable polgmeric material for protection against electrostatic damage to electronic components

Life of this patent

Surface-mountable device having a voltage variable polgmeric material for protection against electrostatic damage to electronic components

Life of this patent

Abstract

Claims7