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Getters and Design to Reliability: A Tool For Lifetime Assurance
Keywords: Getters, Mass Flow, Gas
The key to reaching multi-decade package lifetimes and device reliability is to not just take a snap shot with a RGA and declaring a part passed per 883. It requires a deep understanding of the sources of unwanted gases in a package, characterizing their true flow rates within, without and through the package system, and carefully choosing processes and materials, including getters, to manage the unwanted gases. This is true whether the package is hermetic or non-hermetic. A multi-step process is discussed to include identifying the gas sources, the species present and their quantities, modeling the true quantities of gas generated over the lifetime of the package, and removing it, either through process or materials. When package service lifetimes reach decades, traditional understandings start to fall apart and careful quantitative analysis is rewarded. Getters play a key role in attaining multi-decade lifetimes. Getter selection and sizing is discussed. Included in the discussion will be a brief synopsis of the current state of the art of gettering technology.
Richard C. Kullberg, Business & Product Development
Vacuum Energy Inc.
Shaker Heights, OH

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