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The Challenge of High Reliable Resistors for LTCC Circuits
Keywords: Resistors, LTCC, Reliability
Due to their intrinsic reliability in harsh conditions, LTCC Circuits have found their way into electronic circuitry for automotive applications. These are very dense multi layer LTCC circuits with function such as power train management. Since the reliable lifetime of a car will continue to increase, a material supplier needs to keep pace with ever more stringent demands on performance. All materials in an LTCC system including the LTCC tape, conductors for inner and top layer, resistors and overglazes for protection have to be matched together to fulfil the requested reliability. Resistors with a superior stability play a key role in an LTCC-system. The specification for resistors for automotive application requires a resistor drift of less than +/- 1% after various lifetime tests such as 1000 cycles of thermal shocks. The presentation shows the steps of development for high reliably LTCC-compatible resistor pastes and a detailed description of the various performance test methods. Further to the presentation of the physical data, pictures made by scanning microscopy give understanding as to the behaviour of laser trimmed resistors on LTCC. At the end of this challenging and time consuming development Heraeus demonstrates a complete LTCC-Material System which meets the customer’s specification and which is in the meantime fully established on the market. To meet future automotive applications, a roadmap of future products in pipeline is discussed.
Christina Modes, Business Unit Manager Europe BU Thick Film
W.C. Heraeus GmbH
Hanau D-63450,
Germany


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