SPI Testing Principle and Application

SPI testing

The principle of SPI testing is commonly utilized in SMT assembly to verify the accuracy of the solder paste application on the pads.

SPI testing is beneficial for identifying various issues in solder paste application, such as:

• Solder paste voids: indicating incomplete filling of the pad, potentially leading to weak solder joints.

• Solder paste bridging: where the solder paste forms unintended connections between pads, possibly causing short circuits.

• Solder paste offset: a situation where the solder paste is not correctly aligned on the pad, potentially resulting in subpar solder connections.

Different methods of SPI testing are utilized, including optical SPI inspection,X-ray SPI inspection, and 3D SPI inspection.

Optical SPI inspection involves using a camera to examine the solder paste's shape and size and generate a three-dimensional image by capturing an image of the solder paste on the pad.

X-ray SPI inspection utilizes X-rays to inspect the internal structure of the solder paste, identifying issues like voids and bridging.

On the other hand, 3D SPI inspection employs phase modulation profilometry (PMP) or laser triangulation technology to produce a detailed three-dimensional image of the solder paste.

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