Surface-mount negative-characteristic thermistor

Details Surface-mount negative-characteristic thermistor Surface-mount negative-characteristic thermistor

2011-05-24

2011-05-24

Lee, Kyung (Department: 2833)

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

C338S225000, C338S332000

Reexamination Certificate

active

07948354

ABSTRACT:
A surface-mount negative-characteristic thermistor includes a ceramic body composed of a semiconductor ceramic material including at least one of Mn, Ni, and Ti; external electrodes disposed on surfaces of the ceramic body; and plating films disposed on surfaces of the external electrodes. 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.

REFERENCES:
patent: 5635485 (1997-06-01), Agouridas et al.
patent: 1088709 (1994-06-01), None
patent: 63-315550 (1988-12-01), None
patent: 63-315555 (1988-12-01), None
patent: 63-315556 (1988-12-01), None
patent: 07-235405 (1995-09-01), None
Miura et al.; “Surface-Mount Negative-Characteristic Thermistor”; U.S. Appl. No. 11/835,272, filed Aug. 7, 2007.
Official Communication issued in corresponding Chinese Patent Application No. 200680004097.7, mailed on Jun. 13, 2010.

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