Microelectronic die packages with metal leads, including metal leads for stacked die packages, and associated systems and methods

1. A method of manufacturing a microelectronic device, the method comprising:

stacking a first die package having a first dielectric casing and a first bottom side on a top side of a second die package having a second dielectric casing, wherein the first dielectric casing defines at least a portion of the first bottom side, and wherein the second dielectric casing defines at least a portion of the top side;

aligning first metal leads coupled to the first bottom side of the first die package with second metal leads coupled to the second bottom side of the second die package;

forming individual external inter-package connectors attached to a first portion of individual first leads and to a second portion of individual second leads that are spaced apart from a lateral side of the second casing and project towards the first package; and

coupling package bond pads of the second die package to metal bump pads associated with an interposer substrate.

2. The method of claim 1 wherein forming the connectors comprises wetting metal solder bumps to the first portion of the individual first leads and to the second portion of the individual second leads.

3. The method of claim 1 , further comprising compressing the second metal leads so that the individual second leads bend towards the lateral side of the second casing.

4. The method of claim 2 , further comprising wetting the metal solder bumps to interior and exterior surface portions of the individual second leads.

5. The method of claim 1 , wherein the individual second leads comprise an L-shape, and wherein the second portion includes an angled portion of the individual second leads.

6. The method of claim 1 , wherein the individual second leads comprise a C-shape, and wherein the second portion further includes a tiered portion that projects towards the lateral side of the second casing.

7. The method of claim 1 , further comprising forming a redistribution structure at the second bottom side of the second die package.

8. The method of claim 1 , further comprising:

forming a support substrate adjacent to and spaced apart from the second bottom side, the support substrate having a substrate bond-site; and

forming a substrate connector attached to the substrate bond-site and to the second bottom side.

9. The method of claim 1 , wherein the second portion is substantially perpendicular to the first portion.

10. A method of manufacturing microelectronic die packages, the method comprising:

forming a first die package by forming a first dielectric casing that at least partially encapsulates a first microelectronic die, wherein the first die package includes a first bottom side and a first lateral side, and wherein the first dielectric casing defines at least a portion of the first bottom side;

forming a second die package by forming a second dielectric casing that at least partially encapsulates a second microelectronic die, wherein the second die package includes a top side, a second bottom side and a second lateral side, and wherein the second dielectric casing defines at least a portion of the top side;

forming individual first metal contacts that have a first lateral portion and a first angled portion, the first lateral portion being coupled to the first bottom side of the first dielectric casing and projecting away from the first lateral side of the first dielectric casing, the first angled portion being spaced apart from the first lateral side of the first dielectric casing and extending away from the first lateral portion such that a first interior surface of the first angled portion faces the first lateral side of the first dielectric casing, and wherein the first angled portion is configured to wet to an external inter-package metal solder connector;

forming individual second metal contacts that have a second lateral portion and a second angled portion, the second lateral portion being coupled to the second bottom side of the second dielectric casing and projecting away from the second lateral side of the second dielectric casing, the second angled portion being spaced apart from the second lateral side of the second dielectric casing and extending away from the second lateral portion such that a second interior surface of the second angled portion faces the second lateral side of the second dielectric casing, and wherein the second angled portion is configured to wet to the external inter-package metal solder connector; and

aligning the first metal contacts coupled to the first bottom side of the first die package with the second metal contacts coupled to the second bottom side of the second die package.

11. The method of claim 10 , further comprising forming a dielectric spacer layer at the first or second bottom side of the first or second dielectric casing, wherein the dielectric spacer layer includes metal traces that electrically couple the first or second microelectronic die to the first or second metal contacts.

12. The method of claim 11 , wherein the metal traces are selectively routed for coupling a portion of the first or second metal contacts to the first or second microelectronic die.

13. The method of claim 10 , wherein forming the individual first or second metal contacts further comprises forming a tiered portion that extends from the angled portion inward towards the lateral side of the casing, and wherein the tiered portion is configured to wet to the external inter-package metal solder connector.

14. The method of claim 10 , wherein the first or second angled portions of the first or second metal contacts are juxtaposed to the first or second lateral side of the first or second dielectric casing.