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New Acceleration Factors for Temperature, Humidity, Bias Testing

New temperature-humidity acceleration factors for surface conductance (G) were determined. These can be used to relate device life in a high stress laboratory environment to device life in a normal use environment. Analytical expressions for the acceleration factors were derived for both encapsulated and unencapsulated test specimens. Lower acceleration factors were predicted for specimens encapsulated with DC 3-6550 RTV silicone rubber than for unencapsulated specimens. The new acceleration factors were used to predict failure rates due to electrolytic conduction on active devices.