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Dr. Chris Hunt
When joints look perfect but nonetheless are failing, check the plating adhesion.

Read more: Solder Joint Separation
Chris Hunt
Exposed copper coupled with silver final finish is causing opens.

Figures 1 and 2 show two images of the same problem: one x-ray, the other optical. In both cases it’s the result of sulphur corrosion on the surface of copper and silver surfaces. Both surfaces remain exposed after a soldering operation, and in the presence of sulphur, it is possible to witness corrosion. In time it can result in an open connection, as the figures show. Figure 1, taken on a Dage x-ray system, shows different degrees of corrosion on the tracking just below the solder joint fillet. In failure investigations it’s important to see and record as much as possible without change or damage to the sample. On one joint there was an open connection on this QFP device.

Read more: Sulphur Corrosion on Solder Joints

John Burkhert, Jr.Draw the map and make it happen.

As the saying goes, Rome wasn’t built in a day.

That doesn’t refer to the city-state as we know it, but rather the empire as it was back in the day for my hometown of Augsburg, Germany. Located where the Wertach River joins the Letch River on its way to the Danube, which flows from the Black Forest to the Black Sea. The Danube is a long river starting in Germany and ending at the border between Romania and Ukraine.

Read more: Power Circuits: An Island POV on PCB Design

John Burkhert, Jr.Time-to-market advantages encourage getting designs to scale quickly.

Time to market is one of the most significant factors in the success of a product. The advantage of being first to enter space is that all who come after must be clearly better in some way. Whether it is a feature that resonates with buyers or a lower price, it will be an uphill battle for later entrants to gain market share. Recognition and higher gross margins go to the first mover. Even then, innovations can quickly become commodities.

This is never truer than during a period of upheaval. I was around for the digitization of the phone system. We went from Alexander Graham Bell’s invention of the telephone to using those same wires to carry data. As you know, that caught on well.

Read more: Collaborating with Service Bureaus to Optimize Production Costs and Lead Times

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