Solder Paste Inspection (SPI) for High-Yield SMT Assembly
Years of Experience
Electronics Components
Successful Projects
Experienced Engineers
We understand that solder paste printing is the foundation of any successful SMT assembly process. That’s why we’ve integrated 3D Solder Paste Inspection (SPI) into our production line to detect and correct printing defects before they escalate into costly rework or reliability issues.
SPI is performed immediately after the stencil printing process and before component placement. It ensures that solder paste is deposited in the correct amount, location, and thickness—three key variables that directly impact solder joint quality and overall board functionality.
Why SPI Is Critical for Modern Electronics
With today’s growing demand for miniaturized, high-density PCBs, the margin for error during solder paste application is extremely small. A slightly under-printed pad can lead to weak joints or opens, while overprinting can cause bridging and shorts. SPI helps us eliminate these issues at the source.
Our SPI Capabilities:
3D Measurement Accuracy: Our advanced SPI systems measure paste volume, area, height, and position with micron-level precision in real-time.
Closed-Loop Feedback: The SPI machine communicates directly with our stencil printer, allowing automatic adjustments and continuous print quality improvement.
Full Traceability: Every inspection result is logged and linked to the specific production batch for complete process documentation.
Defect Prevention: Typical soldering defects like insufficient solder, excessive paste, bridging, and misalignment are identified and corrected before placement.
Built Into a Smarter SMT Process
By identifying potential defects early, our SPI process significantly improves first-pass yield, reduces scrap rates, and minimizes downtime. It’s part of our broader quality assurance system, which complies with IPC-A-610 Class II/III, and supports high-reliability applications in automotive, industrial, medical, and consumer electronics.
PCB & Assembly Catalog
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