Patent ID: 7439097
Filing Date: 2008-10-21
Classification: H01L

Abstract:
1. A method of forming a land grid array electronic package, comprising: providing chips having solder bumps disposed in a land grid array; providing a carrier which is a tape of plastics material or is a glass film, the carrier having attached thereto lead frames disposed in an array, each lead frame comprising a plurality of individual lead contacts of thickness not more than 100 μm (4 mil) arranged in a pattern corresponding to the land grid array of solder bumps and each electrically isolated from other metal features of the pattern, each lead frame being separated from adjacent lead frames by metal-free street regions on the carrier; placing the chips on the carrier with the solder bumps over the lead contacts and performing a solder reflow operation to form connections between the chips and the lead contacts; encapsulating the lead frames and street regions of the carrier; removing the carrier; and singulating the encapsulant to form the electronic packages without cutting into metal.