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A pair of thick-film segmented thermistors with negative temperature coefficient (NTC) were joined together (back-to-back) to form thermally coupled device. The alumina substrate enables very high galvanic insulation of thermistors and thermal coupling at the same time. The input thermistor R1 in the coupled pair was self-heated at constant voltages and the output thermistor R2 was a heat receiver through the alumina substrate. Custom-designed NTC thick-film thermistor pastes were made out of nickel manganese and modified nickel manganese. Thermistor electrical resistances were measured in a climatic test chamber and the thermistor exponential temperature factor B was determined for both pastes. The TCT device was electrically characterized at different ambient temperatures. The input power, heat transfer, resistance, and temperature of both thermistors were measured as a function of input voltage and time. The input and output thermistor temperatures T1 and T2 were obtained using the thermistor resistance and the Steinhart-Hart equation. The device sensitivity and measuring inaccuracy were analyzed. The main advantage of TCT is thermal coupling/electrical decoupling. The applications of TCT device are seen in automotive electronics, home appliances, and power converters to measure output temperature versus input power. © 2023 IEEE.