Browse Prior Art Database

Method for a round dual-lip IHS lid

IP.com Disclosure Number: IPCOM000101776D
Publication Date: 2005-Mar-16
Document File: 5 page(s) / 55K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a round dual-lip integrated heatsink (IHS) lid. Benefits include improved functionality, improved performance.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 55% of the total text.

Method for a round dual-lip IHS lid

Disclosed is a method for a round dual-lip integrated heatsink (IHS) lid. Benefits include improved functionality, improved performance.

Background

      A requirement exists to address controlled collapse chip collect (C4) fatigue and interlayer dielectric (ILD) stress caused by the coupling effects of larger IHS lids to the substrate. Typically, the smaller the lid the better the performance. However, the size limits the surface area for providing a good thermal solution for cooling the device.

      The conventional lid is dog-eared, chamfered, or notched to indicate orientation. The position must be verified for each unit during fabrication, which adds cost and slows production throughput.  

General description

      The disclosed method is a round dual-lip IHS lid. It resolves the coefficient of thermal expansion (CTE) mismatch between the lid’s corner and the substrate.

      An inner lip is secured to the substrate surface with sealant, enabling the outer lip to float freely during temperature cycling. This positioning minimizes the coupling effects that contribute to early reliability failures.

Advantages

              The disclosed method provides advantages, including:
•             Improved functionality due to providing a round lid with an inner lip 
•             Improved performance due to eliminating the CTE mismatch between the lid and the substrate

Detailed description

      The disclosed method includes an inner lip that eliminates sharp corners and lowers the CT...