Devices for absorbing energy from electronic components

• US 10,453,773 B2
• Filed: 01/17/2018
• Issued: 10/22/2019
• Est. Priority Date: 09/11/2015
• Status: Active Grant

• Current Assignee: Laird Technologies Incorporated (DuPont de Nemours, Inc.)
• Original Assignee: Laird Technologies Incorporated (DuPont de Nemours, Inc.)
• Inventors: Strader, Jason L., Pruss, Eugene Anthony
• Primary Examiner(s): Han, Jonathan
• Application Number:
  US15/873,131
• Publication Number:
  US 20180182685A1
• Time in Patent Office: 643 Days
• Field of Search: 165185, 1563096, 257717, 438122, 36167954, 361704
• CPC Class Codes: F28F 21/02 of carbon, e.g. graphite
• CPC Class Codes: F28F 21/06 of plastics material
• CPC Class Codes: F28F 21/065 the heat-exchange apparatus employing plate-like or laminated conduits
• CPC Class Codes: H01L 23/3735 Laminates or multilayers, e.g. direct bond copper ceramic substrates
• CPC Class Codes: H01L 23/3736 Metallic materials H01L23/3732, H01L23/3733, H01L23/3735, H01L23/3737, H01L23/3738 take precedence
• CPC Class Codes: H01L 23/3737 Organic materials with or without a thermoconductive filler
• CPC Class Codes: H01L 23/552 Protection against radiation, e.g. light or electromagnetic waves

Abstract

A device for absorbing energy from an electronic component includes a low melting alloy layer including a first side and a second side opposing the first side, and coating layers substantially covering the first side and the second side of the low melting alloy layer. In some embodiments, the low melting alloy layer includes a polymer mixture and a plurality of low melting alloy particulates dispersed in the polymer mixture. Other example devices are also disclosed.

Claims

1. An assembly comprising:

an electronic component on a substrate;

a board level shield including a fence coupled to the substrate and surrounding the electronic component; and

a device for absorbing energy from an electronic component, the device comprising;

a low melting alloy layer including a first side and a second side opposing the first side, the low melting alloy layer includes a polymer mixture and a plurality of low melting alloy particulates dispersed in the polymer mixture,

a first coating layer substantially covering the first side of the low melting alloy layer and/or adjacent a top portion of the device,

a second coating layer substantially covering the second side of the low melting alloy layer and/or positionable adjacent the electronic component, and

at least one thermally conductive layer coupled between the low melting alloy layer and one of the first or second coating layer;

wherein the device is a lid of the board level shield when coupled to the fence and positioned adjacent and over the electronic component, such that one or more portions of the fence pierce through, penetrate through, and/or pass the second coating layer and couple with at least another portion of the device; and

wherein;

the low melting alloy layer is a first low melting alloy layer, and the device further comprises a second low melting alloy layer coupled to the thermally conductive layer;

or

the thermally conductive layer is a first thermally conductive layer, and the device further comprises at least a second thermally conductive layer formed of graphite.

2. The assembly of claim 1, wherein the polymer mixture comprises a crosslinked polymer including silicone, epoxy, or polyurethane, and wherein the low melting alloy particulates dispersed in the polymer mixture comprise gallium, indium, or bismuth.

3. The assembly of claim 1 wherein the low melting alloy layer is the first low melting alloy layer, and the assembly further comprises the second low melting alloy layer coupled to the thermally conductive layer.

4. The assembly of claim 1 wherein the thermally conductive layer is the first thermally conductive layer, and the device further comprises the second thermally conductive layer formed of graphite.

5. The assembly of claim 1 wherein:

the low melting alloy layer is the first low melting alloy layer, and the device further comprises the second low melting alloy layer coupled to the thermally conductive layer;

the thermally conductive layer is the first thermally conductive layer that is formed of graphite and that is coated with the first coating layer to substantially prevent the graphite from flaking off; and

the device further comprises the second thermally conductive layer formed of graphite that is coated with the second coating layer to substantially prevent the graphite from flaking off.

6. The assembly of claim 1, wherein the low melting alloy layer is the first low melting alloy layer, and the device further comprises the second low melting alloy layer including a polymer mixture and a plurality of low melting alloy particulates dispersed in the polymer mixture.

7. The assembly of claim 6, further comprising at least one thermally conductive layer coupled between the first low melting alloy layer and the second low melting alloy layer.

8. The assembly of claim 7, wherein the thermally conductive layer coupled between the first low melting alloy layer and the second low melting alloy layer is formed of graphite.

9. The assembly of claim 8, wherein the thermally conductive layer coupled between the first low melting alloy layer and the second low melting alloy layer is configured to couple to a reference potential and provide shielding of the electronic component.

10. The assembly of claim 7, wherein the thermally conductive layer coupled between the first low melting alloy layer and the second low melting alloy layer is a metallic layer.

11. The assembly of claim 10, wherein the first low melting alloy layer has about a five weight percent or more of the plurality of low melting alloy particulates and/or wherein the first low melting alloy layer has a thickness between about 0.1 mils and about 10 mils.

12. The assembly of claim 1, wherein the lid of the board level shield is coupled to the fence and positioned adjacent and over the electronic component, and the one or more portions of the fence have pierced through and penetrated the second coating layer and are coupled with at least another portion of the device.

13. A device for absorbing energy from an electronic component, the device comprising:

a first thermally conductive layer including a first side and a second side opposing the first side;

two or more low melting alloy layers, one low melting alloy layer coupled to the first side of the first thermally conductive layer, another low melting alloy layer coupled to the second side of the first thermally conductive layer;

two or more graphite layers, one graphite layer coupled to said one low melting alloy layer, another graphite layer coupled to said another low melting alloy layer; and

two or more coating layers, one coating layer substantially covering one side of said one graphite layer, another coating layer substantially covering one side of said another graphite layer;

wherein the device is configured to be attached to a fence of a board level shield that is coupled to a substrate and surrounding the electronic component, such that the device is operable a lid of the board level shield and one or more portions of the fence pierce through, pass, and/or penetrate at least one of the coating layers and couple to at least one of the graphite layers.

14. The device of claim 13, wherein at least one of the low melting alloy layers includes a polymer mixture and a plurality of low melting alloy particulates dispersed in the polymer mixture.

15. The device of claim 13, wherein the first thermally conductive layer is formed of graphite.

16. The device of claim 13, wherein the first thermally conductive layer is a metallic layer.

17. The device of claim 13, wherein the at least one of the graphite layers is configured to couple to a reference potential on the substrate via the one or more portions of the fence and provide shielding of the electronic component.

18. An assembly including the electronic component on the substrate and the board level shield, wherein the board level shield includes:

the fence coupled to the substrate and surrounding the electronic component; and

the device of claim 13 coupled to the fence and positioned adjacent and over the electronic component, such that the one or more portions of the fence pierce through and penetrate the at least one of the coating layers and couple to the at least one of the graphite layers, which thereby allows the at least one of the graphite layers to couple to a reference potential on the substrate via the one or more portions of the fence.

19. An assembly comprising:

an electronic component on a substrate; and

a board level shield including a fence coupled to the substrate and surrounding the electronic component and a lid coupled to the fence, whereby the board level shield is operable for providing shielding of the electronic component;

wherein the lid comprises;

a thermally conductive layer, the thermally conductive layer including a polymer mixture and a plurality of low melting alloy particulates dispersed in the polymer mixture;

a first coating layer;

a second coating layer;

a first graphite layer between the thermally conductive layer and the first coating layer, the first coating layer configured to substantially prevent graphite from flaking off the first graphite layer;

a second graphite layer between the thermally conductive layer and the second coating layer, the second coating layer configured to substantially prevent graphite from flaking off the second graphite layer;

wherein one or more portions of the fence pierce through, pass, and/or penetrate the second coating layer and couple to the second graphite layer, which thereby allows the second graphite layer to couple to a reference potential on the substrate via the one or more portions of the fence.

20. The assembly of claim 19, wherein:

the thermally conductive layer is configured to dissipate the absorbed energy without a dissipating device coupled to the thermally conductive layer; and

the low melting alloy particulates are a first plurality of thermally conductive particulates and wherein the thermally conductive layer includes a second plurality of thermally conductive particles dispersed in the polymer mixture different than the first plurality of thermally conductive particulates.