Abstract
Electrical properties of the laminated SMD-type PTC thermistor for microcircuit protection were investigated as a function of calcination and sintering temperature. BaTiO₃ with Y₂O₃ and MnO₂ were calcined at 1000 to 1150℃ for 2h and the laminated SMDtype PTC thermistor was sintered at 1350 to 1400℃ for 2h in a reduced atmosphere (1% H₂/N₂). Sintered density of the sample was dependent on the calcination and sintering temperature. Electrical properties of the sintered samples were strongly dependent on thedensities of samples. For the samples with density below 4.6 g/㎤, the insulator characteristics were observed, while PTC jump characteristics (R150/R30) were disappeared for the sample with density above 5.05 g/㎤, Optimal PTC characteristics were obtained for the sintered samples with density of 5.05 g/㎥. The laminated SMD-type PTC thermistor prepared by calcination at 1100℃ for 2h and sintering at 1270℃ for 2h showed the room temperature resistivity of 11 Ωㆍcm and PTC jump characteristics of 10 2 order.
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