Abstract
Electrical properties of commercially available and developmental PTC thermistor compositions are presented. The electrical properties of commercially available PTC compositions 5091, 5092, 5093 and their developmental extensions to 16 kohm/sq/mil, were measured on various conductors. Detailed process sensitivities including effects of peak firing temperature, thickness, conductor and firing profile were obtained for the commercially available series. The PTC series is compatible with Ag, Ag/Pd and Au conductors. Sensitivity to processing is a function of the resistance. Low end members 5091 and 5092 have high linear TCR and low process sensitivity, typical of thick film resistors. The 1 kohm/sq/mil member 5093 is more sensitive to processing.
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