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Full Description

The Unbiased HAST is performed for the purpose of evaluating the reliability of non-hermetic packaged solid-state devices in humid environments. It is a highly accelerated test which employs temperature and humidity under non-condensing conditions to 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. Bias is not applied in this test to ensure the failure mechanisms potentially overshadowed by bias can be uncovered (e.g. galvanic corrosion). This test is used to identify failure mechanisms internal to the package and is destructive.
 

Document History

  1. JEDEC JESD22-A118B


    ACCELERATED MOISTURE RESISTANCE - UNBIASED HAST

    • Most Recent
  2. JEDEC JESD22-A118A

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    ACCELERATED MOISTURE RESISTANCE - UNBIASED HAST

    • Historical Version
  3. JEDEC JESD 22-A118 (R2008)


    ACCELERATED MOISTURE RESISTANCE - UNBIASED HAST

    • Historical Version