Process for producing a hermetically sealed package for an electrical component containing a low amount of oxygen and water vapor
First Claim
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1. The process of forming a package having a hermetically sealed enclosure containing an electrical device, comprising the steps of:
- providing a base component having a first surface;
providing a lid component comprised of a gettering alloy having a first surface, said surface oxidized to facilitate bonding;
providing a sealing glass composite;
coating the peripheral portion of said first surfaces of said base and lid components with said sealing glass composite leaving an uncoated area in the middle of said first lid and base components;
sintering the coating of sealing glass composite on said base and lid components;
providing a leadframe;
disposing said leadframe on the glass coated surface of said base component;
heating the assembly of said leadframe and the base component whereby the glass coating melts into a continuous glaze which bonds the leadframe to the base component;
substantially removing the oxide layer from the uncoated area of the lid component subsequent to the sintering step;
electrically interconnecting said electrical component to said leadframe;
stacking said lid component on the assembly of said leadframe and said base component to form the enclosure containing said electrical device, said lid and base components being stacked whereby the glass coating of the lid component contacts the glass coating of the base component; and
heating the assembly of said lid component, said base component and said leadframe to melt the glass coatings on the base and lid components and hermetically seal said enclosure, said heating step for a period of time whereby contact of the gas constituents and the getting alloy within the enclosure results in the amount to be less than about 100 parts per million and about 1000 parts per million, respectively, of the gas constituents.
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Abstract
The present invention is directed to a process of forming a package for enclosing an electrical device wherein the enclosure contains a very low amount of oxygen and water vapor. The package includes a base and lid components bonded together by a sealing glass. The lid component contains a gettering alloy from which the oxide layer is removed prior to the final sealing of the package. The gettering alloy forms a refractory oxide layer under an oxide layer formed with the primary constituent of the alloy.
112 Citations
25 Claims
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1. The process of forming a package having a hermetically sealed enclosure containing an electrical device, comprising the steps of:
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providing a base component having a first surface; providing a lid component comprised of a gettering alloy having a first surface, said surface oxidized to facilitate bonding; providing a sealing glass composite; coating the peripheral portion of said first surfaces of said base and lid components with said sealing glass composite leaving an uncoated area in the middle of said first lid and base components; sintering the coating of sealing glass composite on said base and lid components; providing a leadframe; disposing said leadframe on the glass coated surface of said base component; heating the assembly of said leadframe and the base component whereby the glass coating melts into a continuous glaze which bonds the leadframe to the base component; substantially removing the oxide layer from the uncoated area of the lid component subsequent to the sintering step; electrically interconnecting said electrical component to said leadframe; stacking said lid component on the assembly of said leadframe and said base component to form the enclosure containing said electrical device, said lid and base components being stacked whereby the glass coating of the lid component contacts the glass coating of the base component; and heating the assembly of said lid component, said base component and said leadframe to melt the glass coatings on the base and lid components and hermetically seal said enclosure, said heating step for a period of time whereby contact of the gas constituents and the getting alloy within the enclosure results in the amount to be less than about 100 parts per million and about 1000 parts per million, respectively, of the gas constituents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. The process of forming a package having a hermetically sealed enclosure containing an electrical device, comprising the steps of:
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providing a base component having a first surface; providing a lid component having a first surface comprised of a material selected from the group consisting of metals, alloys, cermets, ceramics, ceramic-glass and ceramic-glass-metal composites; affixing a strip of a gettering alloy to the first surface of said lid component; providing a sealing glass composite; coating the peripheral portion of said first surfaces of said base and lid components with said sealing glass composite leaving an uncoated area in the middle of said first lid and base components; sintering the coating of sealing glass composite on said base and lid components; providing a leadframe; disposing said leadframe on the glass coated surface of said base component; heating the assembly of said leadframe and the base component whereby the glass coating melts into a continuous glaze which bonds the leadframe to the base component; substantially removing the oxide layer from said strip of gettering alloy; electrically interconnecting said electrical component to said leadframe; stacking said lid component on the assembly of said leadframe and said base component to form the enclosure containing said electrical device, said lid and base components being stacked whereby the glass coating of the lid component contacts the glass coating of the base component; and heating the assembly of said lid component, said base component and said leadframe to melt the glass coatings on the base and lid components and hermetically seal said enclosure, said heating step for hermetically sealing said enclosure being for a period of time whereby contact of the gas constituents and the gettering alloy within the enclosure results in the amount of oxygen and water vapor within said enclosure to be less than about 100 parts per million and about 1000 parts per million, respectively, of the gas constituents. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification