We perform hundreds of failure analyses every month for our clients in various industries and identify many different root causes of failure. One that can be difficult to identify and prove is soldering flux residue. As circuit designs shrink and become more complex, flux residues are more likely to cause failure from leakage current.
Power supply is the core of electronic equipment. But as crucial as it is, designing a power supply can be difficult due to an indirect feedback loop within design teams, especially when it comes to thermal solutions. It is often more difficult to know what the temperature should be as opposed to what the temperature will be.
When our customers approach us about battery reliability, the most pressing question is always, “How do we prevent catastrophic battery failures?” While the rate of field failures is statistically low at only 1 to 10 ppm, the impact of battery failures has often been severe in recent years. Higher energy densities, and the use of lithium ion batteries closer to the human body are to blame for the severity of impact.
WHAT is UNDERFILL AND WHY is it USEFUL?
Underfill is thermoset epoxies traditionally used in flip chip applications to reduce thermal stresses solder bumps experience due to coefficient of thermal expansion mismatch between a die and the organic substrate. Today, underfills are available in a variety of formulations and are widely used for board level reliability of ball grid array components by reducing thermal and mechanical loads under harsh use environments. Careful consideration to the underfill material properties and intended use environments must be made to assess the relative reliability improvements underfills offer.
Here at DfR Solutions, we perform hundreds of design review projects a year. Sometimes companies come to us when they are considering a new electronic product and have only the initial designs. In other instances, companies approach us only after their product has already been configured, requesting a review of the final design before moving forward to the manufacturing stage. Ideally for the client, they are in the former group, partnering with us as early in design process as possible. It’s much more efficient (time- and cost-sensitive) to gather all available information and thoroughly check for potential failures of a design before nailing parts down, rather than to complete an assembly only to discover it doesn’t function properly in its use case scenarios.
Working closely with our clients, we receive constant feedback about current challenges facing our industry. This allows us to tailor Sherlock updates to address rapidly developing landscapes as we continuously strive to improve Sherlock to make reliability predictions more accurate and more appropriate to Sherlock users’ needs.
As part of our mission to make Sherlock the most dependable and extensive reliability analysis tool available, we are rolling out an update to our flagship software. The two newest features in Sherlock addresses two key challenges: modeling non-standard BGA layouts and predicting the fatigue life of assemblies utilizing Insulated Metal Substrates (IMS).
In a previous DfR Solutions insight titled Best Practices in Test Plan Preparation, we discussed some of the most important techniques and philosophies when preparing to develop a testing plan for electronic products. What makes those techniques so powerful is that they are ubiquitous: with any design, reviewing the bill of materials, identifying use environments and assessing failure history are both applicable and crucial.
However, what that article did not discuss is that there are considerations that need to be applied in very specific ways. The following are strategies for test plan development that are dependent on specific use cases, parameters, goals, configurations and limitations. While they are just as powerful as our Best Practices, they require a thorough understanding of your product and a clear and agreed-upon set of goals throughout the supply chain.
Product test plans are critical to the success of a new product or technology. Preparing a viable test plan involves several steps to properly identify the requirements for the tests. While many test parameters will vary from product to product, there are elements of the methodology for a test plan approach that remain consistent. These include the necessity for a BOM review to determine part limitations, assessing the field environmental conditions so they can be properly mapped to the tests implemented, and the impact of failure history, should it exist. The objective is to develop a test plan that does not stress the assembly to a level where a failure might not be experienced in the field.