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Method for a DSL load-plate press

IP.com Disclosure Number: IPCOM000022266D
Publication Date: 2004-Mar-03
Document File: 3 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a direct socket loading (DSL) load-plate press. Benefits include improved functionality and improved performance.

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Method for a DSL load-plate press

Disclosed is a method for a direct socket loading (DSL) load-plate press. Benefits include improved functionality and improved performance.

Background

The conventional DSL socket design relies on the operator positioning the package in the socket. The conventional method has a high potential for damage to the socket contacts, which causes the socket to fail, resulting in motherboard rework.

The stamped contact tips of a land-grid array (LGA) socket are about 0.2-mm wide. They must provide the required deflection of the normal force for the socket package interface. This design does not provide contact robustness for human handling. The conventional solution for this problem is to train the operator for package placement. Operator-interface reduction or elimination is required to reduce the possibility of bent contacts.

         The conventional DSL is also designed to contain its own load in the LGA for the lifetime of the socket by the stroke of a lever. As a result, the force applied to the end of the lever is too high to achieve the socket’s life-load for good electrical contact.

         The DSL can be loaded on two edges of the packages. As a result, the outer solder balls are stressed, which can lead to cracking and failure.

General description

The disclosed method is a load-plate press with an alignment fixture that places a die directly in its socket. The method eliminates the human interface that is the cause of bent pins. The DSL contains its own load for electrical performance, using an LGA for the lifetime of the socket with a lever. The force applied to the end of the lever is high enough to achieve the life load of the socket. The DSL has the capability to load the package on all four sides, which ensures that the life-time load is captured. The disclosed method requires minimal human interaction, which reduces or eliminates any ergonomic issues.

The key elements of the disclosed method include:

•         Load press

•         Load plate

Advantages

         The disclo...