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Reliability Testing on a Multilayer Chip Inductor Fabricated From a Ferrite With a 350 ºC Curie Point
Keywords: High Temperature, Multilayer Ceramic Inductor, Ferrite
As more electronics are used in down-hole energy exploration, under the hood automotive applications, and in other environments where temperatures exceed 200 C; there is a need for compact passive magnetic components that operate reliably at elevated temperatures. Most ferrites used to make multilayer ceramic inductors have Curie temperatures in the 100-200 C range. As temperatures rise above the Curie point ferrites lose their magnetic properties and become paramagnetic. This means that traditional multilayer ceramic inductors suffer severe performance degradation when operated at elevated temperatures. Therefore, ferrite materials with higher Curie temperatures need to be investigated for performance and reliability. In this work inductors were made from a low temperature co-fire compatible ferrite with a Curie temperature of 350 C. The inductors were first subjected to a 1000 hour endurance test at 300 C where the electrical parameters were found to remain stable and within expected limits. Additional testing included thermal cycling and thermal shock. Electrical and magnetic properties of the inductors including inductance, resistance, core loss, and saturation flux density were measured at various temperatures. The effect of temperature on the device's frequency profile has also been investigated.
James Galipeau, 179829
NASCEN Technology
Watertown, SD

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