Lead-Free Intermetallic Growth Control in Surface Mount Electronics
Maintain post-reflow intermetallic compound layers between 0.8 and 1.5 microns through controlled thermal profiles to prevent brittle drop failures.
JEDEC JESD22-B117A
Meaning
Microelectronics testing standards define the specific experimental setups and stress parameters used to evaluate the resistance of semiconductor packages to physical drop shock. Utilizing the guidelines of JEDEC JESD22-B117A allows manufacturers to verify the robustness of solder joints under conditions that simulate accidental dropping of handheld electronic devices. This standard dictates the acceleration levels and pulse durations for test boards, ensuring that the results are repeatable across different test facilities.
Standardized testing ensures consistent evaluations across different laboratories, which is vital for global supply chain alignment.
Testing Parameter
Drop tables must hold test boards securely on a specialized fixture to maintain the correct orientation during repeated impacts. Compliance with JEDEC JESD22-B117A requires an acceleration pulse of up to fifteen hundred Gs with a duration of half a millisecond. High-speed accelerometers monitor each drop to verify that the shock profile matches the specification.
Inconsistent pulses invalidate the entire test series.
Stress Level
Accelerating the physical degradation of solder joints requires subjecting the assembly to a specified number of repetitions. In the context of JEDEC JESD22-B117A, testing continues until a pre-determined failure criterion or drop count is reached. Standard testing runs often demand thirty drops to evaluate basic structural durability.
Hardened components require longer cycles.
Failure Analysis
Electrical resistance monitoring during the testing process identifies micro-cracks forming within the interconnecting solder balls. Implementing the tracking protocols of JEDEC JESD22-B117A ensures that transient open circuits are captured before they heal temporarily. These electrical discontinuities point to structural failure.
Detailed microscopic investigation confirms the failure location.