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Lead-free Assembly Quality Inspection

Process/ assembly quality inspection
If the assembled PCBA product has any defects due to bad assembly or incorrect variables, it will strongly affect the reliability of the product. Therefore, every product is tested and inspected after assembly to ensure better reliability testing results.

IPC-A- 610D Visual Inspection
Visual inspection is a required examination after assembly. Currently, the Institute for Printed Circuits (IPC) has designated IPC-A-610D as the standard for assembly quality.

The actual case
Surface crack
Insufficient wetting

2D/3D X-ray Inspection
X-ray inspection can detect void percentage, solder ball shorts, and irregular solder ball sizes.
The Institute for Printed Circuits (IPC) recommends void percentage to be below 25%. Test conducted at our laboratory showed that if the percentage is between 20-25%, during thermal cycling testing, the percentage of bad solder balls is higher. Hence, assembly engineers must take caution.

The actual pictures

Scanning Acoustic Tomography (SAT) Inspection: C-Mode Scanning Acoustic Microscope (C-SAM)
SAT inspection is to examine delamination, bond cracks, and die cracks of IC inner structure and PCBs.
According to testing at our laboratory, over 40-50% of ICs after lead-free assembly showed delamination, which often results in the market's infant mortality. Our non-destructive laboratory has implemented self-developed test methods to test various parts using a supersonic tester in 2004. There methods are widely adopted by Dell Computer for detecting IC delamination in PCBA.

The actual case
heat resistance、delaminate、IMC
This service is belonged to DEKRA iST, please contact below window for any enquiries:
Please contact nearest location for inquiries :
Taiwan China ─ Kunshan Shenzhen Wuhan Chengdu
Other services you may be interested in:
Lead-free Reliability Introduction
Lead-free PCB/Component Level Reliability Test
PCBA/ System Level Reliability Test
Halogen Test
Halogen-free PCB Reliability Test and Failure Analysis

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