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Current protection devices are used to protect circuits from inrush currents and excess currents. TDK offers both NTC inrush current limiters as well as a wide range of PTC thermistors for protection against overload, current surges and excess temperatures. PTC thermistors utilize the fact that their resistance increases rapidly once a certain temperature is reached. This characteristic is used to detect abnormal temperatures or to control inrush currents. NTC thermistors, conversely, are characterized by a high resistance at low temperatures, which decreases with rising temperatures, which makes them suitable for controlling inrush currents immediately after power is activated.


Jul. 18, 2017
Current protection devices:Extended range of PTC inrush current limiters
Jul. 4, 2017
PTC Limit Temperature Sensors (Protection Device): A new release of the product portals.
Jul. 4, 2017
PTC Inrush Current Limiters, PTC Thermistors for Overcurrent Protection, PTC Thermistors for Telecom Applications: A new release of the product portals.
Apr. 12, 2017
“Classifications of Medical Devices” and TDK Products’ Coverage of Those Classes has been released.
Mar. 12, 2017
Release of "myTDK", our membership-based service