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Discusses how with the increasing use of microprocessors for engine control, transmission control, anti-lock braking and multiplex load control the need has arisen for interface and power switching circuits for interfacing from logic level or analogue signals to high current, high voltage loads. Development of these circuits has been mainly driven by the search for improvement of total system performance, protection against the harsh automotive environment, minimum component count and hence lower module costs. Several environmental factors must be considered in the selection of automotive devices. The author presents ICs which are designed to survive the harsh operating conditions, and provide substantial cost savings.