Patent ID: 6162663
Filing Date: 2000-12-19
Classification: H01L

Abstract:
A method of making a heat dissipation arrangement for a circuit board having plural bare silicon chips mounted thereon, comprising the steps of:(a) providing a circuit board having a plural bare silicon chips mounted thereon, the plural bare silicon chips each having an exposed face;(b) providing a heat spreader having a substantially planar portion having inner and outer faces and being sized and shaped for attachment to the circuit board such that the inner face of the planar portion faces the side of the circuit board bearing the bare silicon chips;(c) applying to the inner face a precursor composition curable to a gel composition having a cohesive strength greater than its adhesive strength, a compression modulus less than 1.38 MPa, and a thermal conductivity greater than 1.0 W/m-.degree. C.;(d) curing the precursor composition to convert the precursor composition to the gel composition such that the gel composition forms at least one pad having a thickness between about 0.08 mm and about 1.0 mm; the at least one pad being positioned to contact and completely cover the exposed faces of the plural bare silicon chips when the heat spreader is attached to the circuit board; and(e) attaching the heat spreader to the circuit board so that the at least one pad of gel composition contacts and completely covers the exposed faces of the plural bare silicon chips.