Vented lids for integrated circuit packages
Disclosed herein are vented lids for integrated circuit (IC) packages, as well as related methods and devices. For example, in some embodiments, an IC package may include a package substrate, a lid, and a die between the package substrate and the lid. A vent may extend between the interior surface and the exterior surface of the lid, and the vent may at least partially overlap the die.
1. An integrated circuit (IC) package, comprising:
a package substrate;
a die; and
a lid including an interior surface and an exterior surface,
wherein:
the die is between the package substrate and the lid,
the interior surface of the lid is between the die and the exterior surface of the lid,
a plurality of vents extends between the interior surface and the exterior surface,
a number of vents in the plurality of vents is more than ten,
at least one vent in the plurality of vents at least partially overlaps the die,
the interior surface of the lid includes a metal layer,
the metal layer includes gold or silver, and
the metal layer does not extend into the at least one vent.
2. The IC package of claim 1 , wherein one end of the vents in the plurality of vents is at the interior surface of the lid and above the die.
3. The IC package of claim 1 , wherein neither end of the vents in the plurality of vents is at a top surface of the lid.
4. The IC package of claim 1 , wherein the IC package is a ball grid array package.
5. The IC package of claim 1 , wherein the metal layer extends onto sidewalls of the at least one vent.
6. The IC package of claim 5 , wherein the metal layer does not completely cover sidewalls of the at least one vent.
7. The IC package of claim 1 , wherein at least some vents in the plurality of vents have a tapered cross-section narrowing towards the interior surface.
8. The IC package of claim 1 , wherein at least some vents in the plurality of vents have a tapered cross-section widening towards the interior surface.
9. A lid for an integrated circuit (IC) package, comprising:
a top surface;
a bottom surface parallel to the top surface;
a side surface perpendicular to the top surface and the bottom surface; and
a vent having a first end at the bottom surface and a second end at the side surface,
wherein:
the vent comprises a first plurality of openings at the first end and a second plurality of openings at the second end,
the first plurality of openings is perpendicular to the top surface,
the second plurality of openings is parallel to the top surface,
the first plurality of openings is connected to the second plurality of openings between the top surface and the bottom surface,
the bottom surface of the lid includes a metal layer,
the metal layer includes gold or silver, and
the metal layer does not extend into the vent.
10. The lid of claim 9 , wherein the bottom surface is to face a die in the IC package.
11. The lid of claim 9 , wherein openings in the second plurality of openings are arranged in an X pattern.
12. The lid of claim 9 , wherein openings in the second plurality of openings are arranged in a grid pattern.
13. The lid of claim 9 , wherein the top surface is a flat plane.
14. The lid of claim 9 , wherein openings in the first plurality of openings are arranged in a grid pattern.
15. An integrated circuit (IC) assembly, comprising:
an IC package including a thermal interface material (TIM) between a die of the IC package and a lid of the IC package, wherein the lid of the IC package includes a plurality of vent openings in a bottom surface of the lid, a number of vent openings in the plurality of vent openings is more than ten and the TIM is at least partially between the vent openings and the die; and
a circuit board coupled to the IC package,
wherein:
the TIM includes gold or silver, and
the TIM does not extend into the vent openings.
16. The IC assembly of claim 15 , wherein individual ones of the vent openings are in fluid communication with a vent having at least one other opening at an exterior surface of the lid, and the vent includes a vertical portion and a horizontal portion oriented perpendicular to the vertical portion.
17. The IC assembly of claim 15 , wherein a top surface of the lid does not include any vent openings.
18. The IC assembly of claim 15 , wherein the plurality of vent openings includes between twenty-five vent openings and seventy-five vent openings.
19. The IC assembly of claim 15 , wherein a total area of the vent openings is between 5 percent and 10 percent of an area of the die.
20. The IC assembly of claim 15 , further comprising:
a heat sink, wherein the lid is between the heat sink and the circuit board.