Patent ID: 8754537
Filing Date: 2014-06-17
Classification: H01L

Abstract:
1. A device, comprising: an integrated circuit die having an active surface, a backside, and bond pads at the active side, wherein the bond pads have a contact surface facing away from the die; a coefficient of thermal expansion (CTE) buffer material formed at a perimeter of the die and at least substantially coplanar with the active surface; and a molded body extending around the perimeter of the die and around the CTE buffer material, wherein at least a portion of the molded body is in direct contact with at least a portion of the perimeter of the die; wherein the die has a first CTE, the molded body has a second CTE different from the first CTE, and the CTE buffer material has a third CTE intermediate to the first CTE and the second CTE; wherein the CTE buffer material has a triangular cross-section; and wherein the integrated circuit die has a sidewall contacting the CTE buffer, and wherein the CTE buffer material has a first leg generally parallel with the sidewall and contacting approximately half the sidewall, a second leg generally coplanar with the active surface of the integrated circuit die, and a third leg extending between the first leg and the second leg.