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Evaluation of TFR-Characteristics in a Wide Temperature Range
Keywords: TFR, high temperature characterization, sensors
Thick-Film Resistors (TFR) are applied for many years for the manufacturing of ceramic electronic packages as well as for mechanical or thermal sensors. The resistors characteristics (e.g. Rsqr, HTCR, CTCR) are guaranteed by paste suppliers for a thermal range of operation between -55 and 125°C. In some Cases e.g. sensor applications require higher operation temperatures up to 500°C. In the paper the results of the characterization of commercial TFR at elevated temperatures on different substrate materials are presented. Electrical characteristics (e.g. Rsqr, HTCR, CTCR, GF, Noise, aging) are correlated with materials characteristics (TFR thermal expansion, glass composition and transition temperature, TFR microstructure). Different requirements are discussed regarding an improved high temperature applicability of TFR. Advantages and limits of the application of TFR at elevated temperatures are discussed.
Uwe Partsch, Head of Department
Fraunhofer IKTS
Dresden, Saxony

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