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It relates to the packaging and handling precautions for some semiconductors. The MSL is an electronic standard for the time period in which a moisture sensitive device can be exposed to ambient room conditions (30 °C/85%RH at Level 1; 30 °C/60%RH at all other levels). Increasingly, semiconductors have been manufactured in smaller sizes.
The previous United States Military Specification Mil-I-8835A [permanent dead link ] was the governing specification for a humidity indicator card. The humidity indicator card is also specified for use in J-STD-033, which is the standard for handling, packing, shipping and use of moisture/reflow sensitive surface-mount devices.
IEC 60068 is an international standard for the environmental testing of electrotechnical products that is published by the International Electrotechnical Commission (IEC).. IEC 60068 is a collection of methods [1] for environmental testing of electronic equipment and products to assess their ability to perform under environmental conditions including extreme cold and dry heat.
Battery-powered, formerly mechanical, the data logger is today an electronic device that can be programmed to record individual values over periods of a few hours to several months. Most are used to monitor temperature conditions, and some versions can also measure the relative humidity.
Purpose: Done on the production qualification UUT to demonstrate life-cycle compliance with the reliability specifications per Mil-Std-781, and the original manufacturer's development specifications. Method: Use Mil-Hdbk-781A. The UUT is usually tested to actual environmental levels, but margin is added if accelerated aging is required.
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where E a is the activation energy for the temperature-induced failure (most often 0.7 eV for electronics), k is the Boltzmann constant, T o is the operating temperature in kelvins, and T s is the stressed temperature. Therefore the total acceleration factor for unbiased HAST testing is