Acoustic Inspection: The Key to Semiconductor Reliability

Bryan Schackmuth of Nordson Test & Inspection

4 24, 2025

Acoustic inspection stands as a silent sentinel in semiconductor manufacturing, detecting microscopic defects that could lead to catastrophic failures in high-value applications. Bryan Schackmuth, Senior Product Line Manager at Nordson Test and Inspection, reveals how this technology has evolved from laboratory tools to production-line essentials.

When ultrasound encounters even the tiniest air gap—we're talking hundreds of angstroms—it reflects completely, making acoustic imaging uniquely powerful for evaluating bonds between materials. While optical inspection shows surface defects and X-ray reveals density variations, acoustic inspection peers between layers, identifying delamination and other hidden flaws that might otherwise escape detection until field failure.

The challenges of advanced packaging have driven significant innovation in acoustic inspection technology. As manufacturers stack more die, create complex interconnects, and push toward heterogeneous integration, the value of each wafer increases dramatically. Nordson's SpinSam system represents a breakthrough in this space, replacing traditional raster scanning with a rotational approach that achieves 41 wafers per hour—eight times faster than previous generation technology—while maintaining resolution down to 10 microns.

Beyond pure speed, the system's spinning scan technology offers unique advantages for edge inspection where defects are more common due to coefficient of thermal expansion effects. The modular design allows maintenance on individual scanners while others continue operating, maximizing uptime in production environments. Most exciting is the integration of AI and machine learning for defect detection, moving beyond simple thresholds to analyze complex multilayer images simultaneously.

Want to see how your inspection strategies might benefit from these advances? Check out Nordson's SpinSam technology at nordson.com and discover how acoustic inspection is helping manufacturers achieve higher yields and more reliable products in today's most demanding semiconductor applications.

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