Thermistor
AssigneePolytronics Technology Corp.
InventorsYi An Sha, Kuo Chang Lo, Tsungmin Su
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Abstract
A thermistor includes a first electrically conductive member, a second electrically conductive member and a polymer material layer laminated therebetween. The polymer material layer exhibits positive temperature coefficient (PTC) behavior, and includes at least one crystalline polymer and at least one electrically conductive filler distributed in the crystalline polymer. The conductive filler has a resistivity less than 500 μΩ-cm and includes 72-96% by weight of the polymer material layer. The thermistor has a device effective area, and the value of the hold current at 60° C. divided by the device effective area is around 0.16-0.8 A/mm2. The ratio of the hold current of the thermistor at 60° C. to the hold current at 25° C. of the thermistor is 40-95%.
Claims19
A thermistor comprising:
- a first electrically conductive member;
- a second electrically conductive member;
- and
- a polymeric material layer laminated between the first electrically conductive member and the second electrically conductive member, the polymeric material layer exhibiting positive temperature coefficient behavior, the polymeric material layer comprising at least one crystalline polymer and at least one conductive filler dispersed in the crystalline polymer, wherein the conductive filler has a resistivity less than 500 Ω-cm, and comprises 72-96% by weight of the polymeric material layer;
- wherein the thermistor has a device effective area, the value of a hold current of the thermistor at 60° C. divided by the device effective area is between 0.2 A/mm2 and 0.8 A/mm2;
- wherein a ratio of the hold current of the thermistor at 60° C. to a hold current of the thermistor at 25° C. is between 40% and 95%.
Dependencies are inferred from the claim text.