High density module having at least two substrates and at least one thermally conductive layer therebetween

• US 7,630,202 B2
• Filed: 03/20/2008
• Issued: 12/08/2009
• Est. Priority Date: 04/09/2004
• Status: Active Grant

• Current Assignee: Netlist, Inc.
• Original Assignee: Netlist, Inc.
• Inventors: Bhakta, Jayesh R., Delvalle, Jose, Chen, Chi She, Gervasi, William M., Pauley, Robert S.
• Primary Examiner(s): CHERVINSKY, BORIS LEO
• Application Number:
  US12/052,678
• Publication Number:
  US 20080316712A1
• Time in Patent Office: 628 Days
• Field of Search: None
• US Class Current: 361/721
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/144 Stacked arrangements of planar printed circuit boards
• CPC Class Codes: H05K 2201/10189 Non-printed connector
• CPC Class Codes: H05K 2201/1056 Metal over component, i.e. metal plate over component mounted on or embedded in PCB
• CPC Class Codes: H05K 2201/2018 Presence of a frame in a printed circuit or printed circuit assembly
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing
• CPC Class Codes: Y10T 29/49124 On flat or curved insulated base, e.g., printed circuit, etc.
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A module is electrically connectable to a computer system. The module includes a plurality of electrical contacts which are electrically connectable to the computer system. The module further includes a first substrate which has a first surface and a first plurality of components mounted on the first surface. The first plurality of components is in electrical communication with the electrical contacts. The module further includes a second substrate which has a second surface and a second plurality of components mounted on the second surface. The second plurality of components is in electrical communication with the electrical contacts. The second surface of the second substrate faces the first surface of the first substrate. The module further includes at least one thermally conductive layer positioned between the first plurality of components and the second plurality of components. The at least one thermally conductive layer is in thermal communication with the first plurality of components, the second plurality of components, and a first set of the plurality of electrical contacts.

Claims

1. A module electrically connectable to a computer system, the module comprising:

a plurality of electrical contacts which are electrically connectable to the computer system;

a first substrate comprising a first surface and a first plurality of components mounted on the first surface, the first plurality of components in electrical communication with the electrical contacts;

a second substrate comprising a second surface and a second plurality of components mounted on the second surface, the second plurality of components in electrical communication with the electrical contacts, the second surface of the second substrate facing the first surface of the first substrate; and

at least one thermally conductive layer positioned between the first plurality of components and the second plurality of components, the at least one thermally conductive layer in thermal communication with the first plurality of components, the second plurality of components, and a first set of electrical contacts of the plurality of electrical contacts.

2. The module of claim 1, wherein the at least one thermally conductive layer comprises copper.

3. The module of claim 1, further comprising at least one multilayer structure in electrical communication with the first substrate and with the second substrate.

4. The module of claim 3, wherein the at least one multilayer structure comprises an edge connector comprising the plurality of electrical contacts.

5. The module of claim 3, wherein the at least one multilayer structure comprises a lamination of layers of electrically insulative materials and electrically conductive materials.

6. The module of claim 1, wherein the at least one multilayer structure comprises the at least one thermally conductive layer.

7. The module of claim 1, wherein the first substrate and the second substrate are generally parallel to one another.

8. The module of claim 1, wherein the first plurality of components comprises memory integrated circuits and the second plurality of components comprises memory integrated circuits.

9. A module connectable to a computer system, the module comprising:

a first substrate comprising a first surface and a first plurality of components mounted on the first surface, the first plurality of components in electrical communication with the computer system when the module is connected to the computer system;

a second substrate comprising a second surface and a second plurality of components mounted on the second surface, the second plurality of components in electrical communication with the computer system when the module is connected to the computer system, the second surface facing the first surface; and

a heat spreader comprising at least one sheet of thermally conductive material, the heat spreader between and in thermal communication with the first plurality of components and the second plurality of components, the heat spreader in thermal communication with the computer system when the module is connected to the computer system.

10. The module of claim 9, wherein the thermally conductive material comprises copper.

11. The module of claim 9, further comprising at least one multilayer structure in electrical communication with the first substrate and with the second substrate.

12. The module of claim 11, wherein the at least one multilayer structure comprises an edge connector comprising a plurality of electrical contacts in electrical communication with the computer system when the module is connected to the computer system.

13. The module of claim 12, wherein the at least one multilayer structure further comprises the heat spreader.

14. The module of claim 11, wherein the at least one multilayer structure comprises a lamination of layers of electrically insulative materials and electrically conductive materials.

15. A method of conducting heat away from a first plurality of components mounted on a first surface of a first substrate and from a second plurality of components mounted on a second surface of a second substrate, the method comprising:

coupling the first plurality of components and the second plurality of components to a plurality of electrical contacts;

positioning a thermally conductive layer between the first plurality of components and the second plurality of components, the first surface facing the second surface;

thermally coupling the thermally conductive layer to the first plurality of components, to the second plurality of components, and to the plurality of electrical contacts; and

electrically and thermally coupling the plurality of electrical contacts to a computer system, thereby providing a thermal pathway for heat to be removed from the first plurality of components and from the second plurality of components to the computer system through the plurality of electrical components.

16. A method of fabricating a module electrically connectable to a computer system, the method comprising:

providing a plurality of electrical contacts electrically connectable to the computer system;

providing at least one layer of thermally conductive material which is thermally coupled to the plurality of electrical contacts, the at least one layer of thermally conductive material thermally coupled to the computer system when the plurality of electrical contacts is electrically connected to the computer system;

providing a first substrate comprising a first surface and a first plurality of components mounted on the first surface;

providing a second substrate comprising a second surface and a second plurality of components mounted on the second surface;

electrically coupling the first plurality of components and the second plurality of components to the plurality of electrical contacts; and

thermally coupling the first plurality of components and the second plurality of components to the at least one layer of thermally conductive material, wherein the first surface and the second surface are facing one another and the at least one layer of thermally conductive material is between the first surface and the second surface.

17. A memory module comprising:

at least one thermally conductive layer;

a first substrate comprising a first lateral side facing the at least one thermally conductive layer, the first lateral side having a first plurality of components mounted thereon, the first plurality of components in thermal communication with the at least one thermally conductive layer;

a second substrate comprising a second lateral side facing the at least one thermally conductive layer, the second lateral side of the second substrate having a second plurality of components mounted thereon, the second plurality of components in thermal communication with the at least one thermally conductive layer, wherein the at least one thermally conductive layer is between the first lateral side of the first substrate and the second lateral side of the second substrate.

18. The memory module of claim 17, wherein the first substrate comprises a third lateral side facing away from the first lateral side of the first substrate, the third lateral side having a third plurality of components mounted thereon.

19. The memory module of claim 18, wherein the second substrate comprises a fourth lateral side facing away from the second lateral side of the second substrate, the fourth lateral side having a fourth plurality of components mounted thereon.

20. The memory module of claim 17, further comprising a third substrate comprising the at least one thermally conductive layer and a plurality of electrical contacts positioned along an edge of the third substrate, the plurality of electrical contacts connectable to a computer system, the at least one thermally conductive layer in thermal communication with the plurality of electrical contacts.