DuPont Microcircuit Materials (MCM) introduces a ceramic solution for embedding resistors and capacitors in PWBs. The Interra material system enables circuit board manufacturers to embed high tolerance and reliable thick film resistors along with high density capacitors within the layers of multilayer boards using a simple and cost-effective process. The Interra EP20x series ceramic embedded resistor system based on a nitrogen-firing lanthanum boride (LaB6) conductive phase enables combining the stable and reliable performance of ceramic resistor pastes with the miniaturization of printed circuit boards. Embedded resistors are encapsulated with a ceramic-filled epoxy coating to provide a backing, which allows laser trimming without damage to the underlying substrate, such as FR4, and achieving initial tolerances of better than 2%.
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