Auto re-set over-current protection resistors
29 November 2006
Circuit & System Protection
Murata's new thermistor offers an internal resistance of only 0,20 Ω; allowing non-operating current flows up to 500 mA at 60°C in an 0805 format (PRG210R2).
The PRG18/21 family of posistors (positive temperature coefficient thermistors) provides over-current protection across a broad range of operating and non-operating current levels. They exhibit a rapid increase in resistance at their operating currents, or if subjected to external over-heating.
Current ratings up to 25 mA are in the 0603 format (PRG18), above that they are in an 0805 package (PRG21).
Key features are: very sharp resistance/temperature characteristics; non-operating currents from 7 to 500 mA; operating-currents from 25 mA to 2000 mA; self-resetting. Applications are for over-temperature protection, over-current protection, and temperature sensing.
Further reading:
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