Power Semiconductor Device Assembly
Power semiconductor device assemblies are provided. In one example, a power semiconductor device assembly includes a semiconductor device package with one or more terminals. The semiconductor device package comprises one or more wide bandgap semiconductor die. The power semiconductor device assembly includes a support structure. The semiconductor device package is mounted onto the support structure. The power semiconductor device assembly includes an underfill structure. The underfill structure is at least partially on the support structure and the semiconductor device package.
1 . A power semiconductor device assembly comprising:
a semiconductor device package with one or more terminals, wherein the semiconductor device package comprises one or more wide bandgap semiconductor die;
a support structure, wherein the semiconductor device package is on the support structure; and
an attach layer between the semiconductor device package and the support structure, wherein the attach layer has a nonuniform thickness.
2 . The power semiconductor device assembly of claim 1 , wherein the attach layer has a first portion and a second portion, wherein a thickness of the first portion is greater than a thickness of the second portion.
3 . The power semiconductor device assembly of claim 2 , wherein the first portion is in a peripheral portion of the attach layer and the second portion is in a central portion of the attach layer.
4 . The power semiconductor device assembly of claim 2 , wherein the attach layer has a rectangular shape having a central portion and four corner areas and the first portion is at least one of the corner areas and the second portion is in the central portion.
5 . The power semiconductor device assembly of claim 1 , wherein a peripheral portion of the attach layer has a non-uniform thickness and a central portion of the attach layer has a uniform thickness.
6 . The power semiconductor device assembly of claim 1 , wherein the attach layer comprises sintered silver.
7 . The power semiconductor device assembly of claim 1 , wherein the support structure is a heatsink.
8 . The power semiconductor device assembly of claim 1 , wherein the support structure comprises a pedestal and the attach layer is in contact with the pedestal.
9 . The power semiconductor device assembly of claim 8 , wherein the pedestal has a non-planar mounting surface.
10 . The power semiconductor device assembly of claim 9 , wherein the pedestal has a chamfered edge, a filleted edge, a chamfered corner, or a sigmoid edge profile.
11 . The power semiconductor device assembly of claim 9 , wherein the pedestal comprises at least one step.
12 . The power semiconductor device assembly of claim 9 , wherein the pedestal has a notch on the mounting surface.
13 . The power semiconductor device assembly of claim 9 , wherein the pedestal has a ramped surface adjacent to an edge portion.
14 . The power semiconductor device assembly of claim 9 , wherein the pedestal has at least one modified corner.
15 . The power semiconductor device assembly of claim 9 , wherein the pedestal has an undercut edge.
16 . The power semiconductor device assembly of claim 8 , wherein the support structure comprises a trench adjacent to an edge of the pedestal.
17 . The power semiconductor device assembly of claim 1 , wherein the semiconductor device package has a notched bottom surface.
18 . The power semiconductor device assembly of claim 1 , wherein the one or more wide bandgap semiconductor die comprise silicon carbide.
19 . A power semiconductor device assembly comprising:
a semiconductor device package with one or more terminals, wherein the semiconductor device package comprises one or more wide bandgap semiconductor die;
a support structure, wherein the semiconductor device package is mounted onto the support structure; and
an attach layer between the semiconductor device package and the support structure, wherein the attach layer has an average thickness of 200 μm or less, and wherein a maximum strain on the attach layer is 0.14 m/m or less.
20 . A power semiconductor device assembly comprising:
a semiconductor device package with one or more terminals, wherein the semiconductor device package comprises one or more wide bandgap semiconductor die;
a support structure comprising a pedestal, wherein the semiconductor device package is mounted onto the support structure; and
an attach layer between the semiconductor device package and a mounting surface of the pedestal, wherein the mounting surface of the pedestal is non-planar.