Reworkable circuit board assembly including a reworkable flip chip
First Claim
1. A reworkable circuit board assembly comprising:
- a heat sink;
a deformable circuit board having a first side and a second side, the first side being secured to a side of the heat sink in thermal communication therewith to form a heat sink/deformable circuit board assembly; and
,a flip chip bonded to the second side of the deformable circuit board without underfill to facilitate removal of the flip chip for replacement in the event of a rework, wherein the heat sink has a coefficient of thermal expansion which substantially matches a coefficient of thermal expansion of the flip chip, the deformable circuit board being deformable to release heat-induced stress in a joint between the flip chip and the heat sink/deformable circuit board assembly.
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Accused Products
Abstract
A reworkable circuit board assembly including a flip chip adapted for removal in the event of a failure and a method for fabricating the same is disclosed. The reworkable circuit board assembly includes a heat sink having a coefficient of thermal expansion substantially matched to the coefficient of thermal expansion of the flip chip. It also includes a deformable circuit board having a first side and a second side, wherein the first side is secured to a side of the heat sink in thermal communication therewith. The flip chip is bonded to the second side of the deformable circuit board without underfill or with weak bond strength underfill to facilitate removal of the flip chip in the event of a rework.
31 Citations
13 Claims
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1. A reworkable circuit board assembly comprising:
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a heat sink; a deformable circuit board having a first side and a second side, the first side being secured to a side of the heat sink in thermal communication therewith to form a heat sink/deformable circuit board assembly; and
,a flip chip bonded to the second side of the deformable circuit board without underfill to facilitate removal of the flip chip for replacement in the event of a rework, wherein the heat sink has a coefficient of thermal expansion which substantially matches a coefficient of thermal expansion of the flip chip, the deformable circuit board being deformable to release heat-induced stress in a joint between the flip chip and the heat sink/deformable circuit board assembly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A reworkable circuit board assembly comprising:
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a heat sink; a deformable circuit board having a first side and a second side, the first side being secured to a side of the heat sink in thermal communication therewith; and
,a flip chip bonded to the second side of the deformable circuit board with a weak bond strength, thermally conductive underfill adhesive to facilitate removal of the flip chip for replacement in the event of a rework, wherein the heat sink has a coefficient of thermal expansion which substantially matches a coefficient of thermal expansion of the flip chip, the deformable circuit board being deformable to release heat-induced stress in a joint between the flip chip and a heat sink/deformable circuit board assembly. - View Dependent Claims (13)
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Specification