Patent ID: 7548149

Claim:
A surface-mount negative-characteristic thermistor comprising: a ceramic body composed of a semiconductor ceramic material including Mn, Ni, and Ti; external electrodes disposed on surfaces of the ceramic body; and plating films disposed on the external electrodes; wherein when the molar quantity of Mn in the semiconductor ceramic material is represented by a and when the molar quantity of Ni in the semiconductor ceramic material is represented by b, the molar ratio of Mn to Ni is in the range of 55/45 ≦a/b≦90/10, and when the total molar quantity of Mn and Ni in the semiconductor ceramic material is defined as 100 parts by mole, the content of Ti is in the range of about 0.5 parts by mole to about 25 parts by mole; internal electrodes are embedded in the ceramic body and include Ag, and the internal electrodes are electrically connected to the external electrodes; and the internal electrodes are each composed of Ag—Pd, and the content of Ag is in the range of about 60% to about 90%.