Global Standards for the Microelectronics Industry
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HIGHLY ACCELERATED TEMPERATURE AND HUMIDITY STRESS TEST (HAST)
The purpose of this test method is to evaluate the reliability of nonhermetic packaged solid state devices in humid environments. It employs severe conditions of temperature, humidity, and bias that accelerate the penetration of moisture through the external protective material (encapsulant or seal) or along the interface between the external protective material and the metallic conductors which pass through it.