GB/T 4937.24-2025 Semiconductor devices—Mechanical and climatic test methods—Part 24:Accelerated moisture resistance—Unbiased HAST
GB/T 4937.24-2025 Semiconductor devices—Mechanical and climatic test methods—Part 24:Accelerated moisture resistance—Unbiased HAST
Basic Information
Scope
This document is used to evaluate the reliability of non-airtight encapsulated solid-state devices in humid environments.
This method is a high-accelerated test, which accelerates the penetration of moisture through the external protective material (encapsulation or sealing) or the interface between the external protective material and metal conductors under non-condensing conditions. This method does not apply a bias voltage to ensure that potential failure mechanisms cannot be caused by bias voltage (e.g., electrochemical corrosion).
This test is used to determine the failure mechanisms inside the encapsulation and is a destructive test.
Note: This method is a rewritten version of the test described in Section 4c of Chapter 3 of the 1996 edition of IEC 60749 (without a bias voltage).