Development of SMD Positive Temperature Coefficient Thermistors by TDK-EPC
TDK-EPC has successfully developed SMD Series PTC (Positive Temperature Coefficient) thermistors for limit temperature measurement. The new thermistors come in case sizes of 0805, 0603 and 0402. They are designed for over temperature protection in industrial equipment as well as consumer and automotive electronics and IT applications. They have response temperatures from 70 to 145 degrees Celsius in steps of 10K depending on the series.
The SMD Series PTS have AEC Q-200 qualification, which is a test criterion by the Automotive Electronics Council that applies to passive components. The new series is suitable for reflow and wave soldering up to 280 degrees Celsius. Ideal applications for these temperature limit sensors are power supplies such as AC/DC and DC/DC converters, battery chargers and packs or lamp ballasts. The SMD PTC thermistors can be used in fan controllers of notebooks for avoiding critical temperatures. In automotive electronics application they are suitable for such devices as the temperature monitoring of LED-based lighting systems. The rated resistance of these components is 470 ohm, with a maximum permissible operating voltage of 32 V DC. UL approval for these components is pending.