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Advanced Conformal Barrier Technology for Non-Hermetic Packaging of Electronics
Keywords: Conformal Barrier , Parylene, Non-hermetic
The development of robust and reliable non-hermetic electronics would not only reduce the costs associated with hermetic packaging, but also provide the way for environmental friendly low-cost packaging options for many electronics and components used in various applications. There are many conformal materials and processes available today that may be used for non-hermetic packaging. However, reliability challenges for their long-term performance requirements, particularly in highly corrosive, hot and humid environments still exist. Fine geometry electronic parts are more difficult to assemble, particularly with conventional packaging, adhesives and coatings, due to difficulty in sealing gaps. Meeting the current demand for environment-friendly products, solvent and catalyst-free Parylenes, which are applied using vapor phase polymerization, offer solutions to many existing non-hermetic assembly, protective, packaging and reliability challenges of electronic industry, in part because of their excellent electrical & mechanical properties, chemical inertness, long-term thermal stability (including high temperature exposure to over 350oC) and their true conformability to the parts due to their molecular level deposition characteristics. This presentation highlights key characteristics of environment-friendly and RoHS compliant Parylenes' impact on electronics. It also discusses comparative advantages over existing conformal barrier options for non-hermetic packaging, protection and reliability enhancement of various electronics and their components (metal, plastic, semiconductor and ceramic substrates) from chemical corrosion and other harsh environment effects. In addition, it describes and compares the results of tests conducted on Parylenes per Mil/IPC and highlights some key parameters that are important in predicting the service life of the conformal insulation.
Rakesh Kumar, V. P. of Technology
Specialty Coating Systems, Inc.
Indianapolis, IN

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