Low cost hermetic ceramic microcircuit package
View Patent ↗Hermeticity of microcircuit packages is achieved in one embodiment by recognition that water can penetrate the ceramic structure and thus the ceramic structure is sealed and the edges of the ceramic package are metallically bonded to the electronic package. In one embodiment, a clear ceramic dielectric compound is sprayed on the ceramic and then the package is glazed.
1. A hermetically sealed non-metallic package lid comprising:
an interior surface;
a metallic binding agent on bottom edges of said package, corresponding to plating material of an electronics package surface:
a coating provided over said interior surface, said coating operative to prevent moisture from penetrating through the non-metallic package lid and onto said electronics package surface; and
a metallic bonding agent on the edges of said package lid where said edges contact said electronics package surface, wherein said metallic bonding agent and said coating provide a hermetic seal for said electronic package.
2. The package lid of claim 1 wherein said metallic bonding is heat activated.
3. The package lid of claim 1 wherein said non-metallic package lid is ceramic.
4. The package lid of claim 1 wherein said coating is a ceramic dielectric material.
5. The package lid of claim 1 wherein coating is clear.
6. The package lid of claim 1 wherein said metallic bonding agent is a solder.
7. The package lid of claim 6 wherein said solder is a gold/tin composite.
8. The hermetically sealed non-metallic package lid of claim 1 , wherein the metallic binding agent comprises a ceramic.
9. A cover for positioning around components on an RF circuit board, said cover comprising:
a ceramic housing;
a coating provided over an interior surface of said ceramic housing, said coating operative to prevent moisture from penetrating through said ceramic housing and onto said RF circuit board;
means for binding disposed on the bottom edges of said package, corresponding to plating material of an electronics package surface; and
means for metallically bonding said sealed housing to said circuit board to create a hermetic atmosphere around RF components inside said component.
10. The cover of claim 9 wherein metallically bonding means comprises: a gold/tin solder compound.
11. The cover of claim 9 wherein said coating comprises a dielectric compound bonded to said ceramic housing.
12. The cover of claim 9 , wherein the binding means comprises a ceramic.
13. A package for use in sealing an electronic circuit, said circuit mounted on a platforn, said package comprising:
a non-metallic frame;
a coating provided over an interior surface of said non-metallic frame, said coating operative to prevent moisture from penetrating through said non-metallic frame and onto said electronics circuit, wherein said interior surface defines a surface area large enough to fit over and around said electronics;
means for binding disposed on the bottom edges of said package, corresponding to plating material of an electronics package surface; and
a means integral with the edges of said non-metallic frame for bonding said frame to said platform.
14. The package of claim 13 wherein said coating comprises a ceramic dielectric material.
15. The package of claim 13 wherein a metallic bonding material is bonded to said edges of said package.
16. The package of claim 13 wherein said platform is gold plated and wherein said metallic bonding material is gold/tin solder.
17. The package of claim 16 wherein said gold/tin solder melts at a temperature in the range of 300° C.
18. The package of claim 13 , wherein the binding means comprises a ceramic.
19. An electronic package, comprising:
a non-metallic package lid configured to fit over an electronic device disposed over a substrate, the non-metallic package lid comprising: an edge; an interior surface; and a coating disposed over the interior surface of the non-metallic package, wherein the coating prevents moisture from penetrating through the non-metallic package lid and onto said electronic device; and
a metallic bonding agent disposed over the edge of the non-metallic package lid and adapted to contact the substrate, wherein the coating and the metallic bonding agent provide a hermetic seal for the electronic package.
20. An electronic package as claimed in claim 19 , wherein the metallic bonding agent is heat activated.
21. An electronic package as claimed in claim 19 wherein the non-metallic package lid comprises a ceramic material.
22. An electronic package as claimed in claim 19 wherein the coating is a ceramic dielectric material.
23. An electronic package as claimed in claim 19 wherein the coating is clear.
24. An electronic package as claimed in claim 19 , wherein the metallic bonding agent comprises a solder.