High capacitance MLCCs for medical and military applications

May 25, 2018 // By Nick Flaherty
Knowles Precision Devices (KPD) has launched a series of multilayer ceramic capacitors (MLCCs) for medical and military applications where a high capacitance value and reliability is required.

The Novacap MLCCs have low ESR characteristics to reduce the required capacitance values by a third to a fifth.

The RoHS Compliant, High Capacitance value BME MLC chip capacitors are manufactured in stable Class II dielectrics X7R and X5R.  The range is offered with a spread of capacitance values starting at 6.8nF and topping out at 100μF and the low ESR characteristics are targetted at replacing tantalum and Low ESR Electrolytic Capacitors without polarity concerns.

The MLCCs are typically used as power supply bypass capacitors, smoothing capacitors, input/output filters in DC-DC Converters and in digital circuits and LCD modules. ±10% and ±20% capacitance tolerances are available and all parts are available with high reliability screening.

Nickel Barrier termination options include tin, tin/lead or gold flash and all are suitable for reflow soldering. The Gold Flash option is of particular interest to eliminate the problem of tin ‘whiskering’.  This issue has become prevalent because pure tin-plated terminations, brought in to comply with RoHS directives, allow tin whiskers to grow from surfaces and can cause electrical short-circuits and failures.  This sort of failure can represent a clear and present danger especially to Hi-Rel applications such as medical implantable devices and military equipment.

Novacaps’ gold flash termination has been developed for conductive epoxy or gold/indium solder attachment and consists of a 5 micro-inch minimum gold flash over a nickel barrier. 

www.knowlescapacitors.com


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