Function of SPI in Solder Paste Inspection | Why It Matters | SMTFullLine
2026-03-24 11:53
Function of SPI in Solder Paste Inspection
Solder Paste Inspection (SPI) is the gatekeeper after printing. Knowing the function of SPI in solder paste inspection helps you catch defects before component placement. SMTFullLine offers 2D and 3D SPI systems.
Primary Functions of SPI
| Function | What It Measures | Why Important |
|---|---|---|
| Volume measurement | Amount of solder paste deposited | Too little = insufficient solder; too much = bridging |
| Height measurement | Thickness of paste from pad | Insufficient height may indicate clogged stencil |
| Area coverage | Percentage of pad covered by paste | Reveals misalignment or insufficient print |
| Bridge detection | Solder paste connecting separate pads | Prevents short circuits after reflow |
| Shift/alignment | Offset of paste from pad center | Indicates stencil misalignment |
How SPI Improves Quality
Real‑time feedback – Some SPI systems can adjust printer parameters automatically (closed loop).
Defect tracking – Trend analysis helps schedule stencil cleaning.
Avoids expensive rework – Catching paste defects before placement saves 10x cost.
SMTFullLine’s SPI Solutions
We offer bench‑top 3D SPI for small lines and inline 3D SPI for automated production. All systems generate detailed reports (volume histograms, Cp/Cpk).
Stop paste defects before they become solder defects.
Request an SPI demo at SMTFullLine.com.
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