PCB QA Demands Small Incremental Steps
Quality assurance (QA) if foremost in PCB design, fabrication, and assembly. At times, QA is an afterthought implemented at the end of the assembly process. But the best, most reliable, and correct approach for applying QA is to implement small, well-thought-out, and incremental steps all along the product cycle process from beginning to end. Here are some tips to follow to correctly apply QA:
- Have your EMS provider or contract manufacturer (CM) provide you a list of the QA steps they take a design, fabrication, and assembly.
- Component part manufacturing wizards are used for QA at design. But require your CM to have a second set of files check in the QA process.
- Make sure your design layout undergoes a layout simulation process to cancel jitter and noise to achieve as perfect an eye diagram as possible.
- At fabrication, it’s important to closely view drill charts to assure holes are at the proper places.
- Also, at fabrication, it is vital to re-calculate and re-verify the impedance control calculation to avoid costly errors.
- At assembly, check with your CM or EMS provider to make sure they have the most advanced test and inspection (T&I) systems available. Advanced T&I systems are critical for today’s complex components like microBGAs, CSPs, and QFNs. Sophisticated T&I assure sub-assemblies are built according to spec and checked for values, footprints, tolerances, strong solder joints, and other assembly steps.