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Semitec ET Miniature Epoxy NTC Thermistor

Originally designed for clinical thermometer applications, this small bead NTC thermistor is very versatile and suitable for a wide range of applications.  The fast response time in air of approximately 3.2 seconds, high accuracy and precise format make it a universal choice for low-cost applications.

ET series thermistors are mounted on stiff or flexible lead-wires giving users a choice of rigidity in their application. The ET-1 version has a built-in strain-relief point to help minimise the bead size and thus maximise the speed of response. ET-3H versions have lacquered lead-wires which help to insulate the thermistor and provide environmental protection in heat detector applications.

As well as a wide range of nominal R25 resistance values, ET thermistors can be point-calibrated at 37°C with tolerances of ±1% or less.  Also highly accurate matched R37 resistance groups (with accuracy +/-0.1°C or smaller) can be produced to help minimise unit cost whilst maximising sensor accuracy in high volume applications such as clinical thermometers.


  • Medical thermometers
  • Wearable tracker devices
  • Battery chargers and battery packs
  • Heat detectors and fire detectors
  • Room thermostats
  • Home automation products


  • Highly accurate and very fast response
  • Tight resistance and B-value tolerances
  • Small epoxy bead size <1.6mm
  • Operating range -40°C/+100°C
  • Various insulated lead-wire options

See attached datasheet for RT table information and further product details

Miniature temperature sensors Semitec ET NTC Thermistor Product Dimensions

Technical Specifications

Semitec ET Epoxy NTC Thermistor RT Table