Patent ID: 7948354

Claim:
A surface-mount negative-characteristic thermistor comprising: a ceramic body composed of a semiconductor ceramic material including Mn, Co, 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 Co in the semiconductor ceramic material is represented by c, the molar ratio of Mn to Co is in the range of 10/90≦a/c≦70/30, and when the total molar quantity of Mn and Co in the semiconductor ceramic material is defined as 100 parts by mole, the content of Ti is in the range of about 1 part by mole to about 30 parts by mole; and when the total molar quantity of Mn and Co in the semiconductor ceramic material is defined as 100 parts by mole, the thermistor further comprises Fe in the range of about 7 parts by mole to about 31 parts by mole.